ABSTRACT
The biological parameters of Necrobia rufipes (DeGeer, 1775) are estimated under controlled temperature and relative humidity. The adults, collected from industrial canine food at a supermarket in Campina Grande, state of Paraíba, Brazil, were taken to the Laboratory of Insect Systematics and Bioecology at the Universidade Estadual da Paraíba, in order to ascertain the matrix creation. The individuals were placed in boxes with hermetic sealing, each containing 20 adults, and were fed a diet of 1.8 g of fish flour, a slice of bacon, and four dog food pellets. A total of 160 eggs were individualized in the plastic recipient in a base of paper filter, covered with voil tissue, and secured with an elastic cord. The containers were placed in a B.O.D. camera at temperatures of 20, 24, 28, and 32 °C and relative humidity of 70%. The larvae received a diet composed of 0.45 g of fish flour, a slice of bacon, and dog food pellet. The development of phases was monitored daily. The life cycle from egg to adult was completed in four temperatures and encompassed four larval instars. The development speed at all stage phases was affected by temperature. Higher thermal conditions increase development speed and consequently reduce the duration of the immature and adult stages. The development of N. rufipes was completed at 20 and 32 °C, two temperatures that are not considered optimal for insect development. The fact that N. rufipes is a pest of storage grains, however, may explain why this insect is able to tolerate and develop under suboptimal temperatures.
KEY WORDS:
Biological parameters; Necrophagous; Red-legged ham beetle; PMI
INTRODUCTION
The study of colonization of dead bodies by insects and other arthropods is known as Medical-legal Forensic Entomo logy (Hu et al. 2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14., Key 1985Key B (1985) Scope and applications of forensic entomology. Annual Review Entomology 30: 137-154.). Forensic entomologists estimate the Post Mortem Interval (PMI) through analysis of data related to the lifecycle and succession of species of insects found in a decaying body (Tomberlin et al. 2011Tomberlin J, Mohr R, Benbow M, Tarone A, VanLaerhoven S (2011) A roadmap for bridging basic and applied research in forensic entomology. Annual Review of Entomology 56: 401-421.). These patterns of succession are a variable process that depends on the biotic and abiotic conditions of the environment (Hu et al. 2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.).
Coleoptera is the second largest order of insects relevant to forensics. A great number of specimens and species are found during the advanced stages of carcass decomposition in open environments. Dipterans, also common in corpses, do not colonize the later stages in great numbers (Goff 1991Goff ML (1991) Comparison of insect species associated with decomposing remains recovered inside dwellings and outdoors on the island of Oahu, Hawaii. Journal of Forensic Sciences 36: 748-753.). Therefore, Coleoptera comprises the main entomological evidence for determining PMI, based especially on their pattern of succession when dry human skeletons are recovered (Kulshrestha and Satpathy 2001Kulshrestha P, Satpathy DK (2001) Use of beetles in forensic entomology. Forensic Science International 120: 15-17.).
Coleoptera have cosmopolitan distribution and are the largest and most diverse group of organisms in the ani mal kingdom, with more than 380.000 described species, representing approximately 25% of all animal species on planet Earth (Ślipiński et al. 2011Ślipiński SA, Leschen RAB, Lawrence JF (2011) Order Coleoptera Linnaeus, 1758. Animal biodiversity: an outline of higher-level classification and survey of taxonomic richness. Zootaxa 3148: 203-208., Zhang et al. 2018Zhang S-Q, Che L-H, Li Y, Liang D, Pang H, Ślipiński A, Zhang P (2018) Evolutionary history of Coleoptera revealed by extensive sampling of genes and species. Nature Communications 9: 205.). Cleridae (Cucujiformia: Cleroidea) is one among more than 200 families belonging to this order and is subdivided into 13 subfamilies (Opitz 2010Opitz W (2010) Classification, natural history, phylogeny, and subfamily composition of the Cleridae and generic content of the subfamilies (Coleoptera: Cleroidea). Entomologica Basiliensia et Collections Frey 32: 31-128., Gunter et al. 2013Gunter NL, Leavengood JM, Bartlett JS, Erıc G, Chapman EG, Cameron S (2013) A molecular phylogeny of the checkered beetles and a description of Epiclininae a new subfamily (Coleoptera: Cleroidea: Cleridae). Systematic Entomology 38: 626-636. https://doi.org/10.1111/syen.12019
https://doi.org/10.1111/syen.12019...
): Clerinae, Enopliinae, Epiclininae, Epiphloeinae, Hydnocerinae, Isoclerinae, Korynetinae, Orthopleurinae, Peloniinae, Platynopterinae, Tarsosteninae, Tillinae, Thaneroclerinae. The family has appro ximately 3,700 species distributed worldwide, and these in turn are allocated in about 350 genera (Okutaner 2020Okutaner AY (2020) First cytogenetic information on four checkered beetles (Coleoptera, Cleridae). Comparative Cytogenetics 14(4): 541-547. https://doi.org/10.3897/CompCytogen.v14.i4.55358
https://doi.org/10.3897/CompCytogen.v14....
). In the Neotropical region, there are about 886 species in 61 genera; in Brazil, about 506 species in 71 genera (Gerstmeier and Cupello 2024Gerstmeier R, Cupello M (2024) Cleridae. Brazilian Zoology Group (Ed.) Catálogo Taxonômico da Fauna do Brasil. http://fauna.jbrj.gov.br/fauna/faunadobrasil/206623 [Accessed: 02/09/2024]
http://fauna.jbrj.gov.br/fauna/faunadobr...
).
Clerids are beetles with a long, shiny, and pubescent body from 3 to 24 mm long- usually from 5 to 12 mm (Triplehorn and Johnson 2011Triplehorn CA, Johson NF (2011) Estudos dos insetos. Cengage Learning, São Paulo, 816 pp.). Most larvae and adult beetles are considered predators and can be found in a broad variety of environments, such as flowers, tree trunks, fungi, and carrion (Opitz 2002Opitz W (2002) Cleridae Latreille 1804. In: Arnett RH Jr, Thomas MC, Skelley PE, Frank JH (Eds) American Beetles. CRC Press, Boca Raton, vol. 2, 267-280.). Some species are recognized as pests, since they damage stored food products such as seeds, dried meat, ham, and sausage (Ashman 1963Ashman F (1963) Factors affecting the abundance of the copra beetle Necrobia rufipes (DeGeer) (Coleoptera: Cleridae). Bulletin of Entomological Research 53: 671-680., Osuji 1977Osuji FNC (1977) The development of Necrobia rufipes in dried fish and certain other commodities. Nigerian Journal of Science 15: 21-32.).
Necrobia rufipes (DeGeer, 1775), also known as red-legged ham beetle, is a cosmopolitan species, a predator, and a primary pest of food products rich in protein (Ashman 1963Ashman F (1963) Factors affecting the abundance of the copra beetle Necrobia rufipes (DeGeer) (Coleoptera: Cleridae). Bulletin of Entomological Research 53: 671-680., Hu et al. 2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.). Under ideal climatic conditions, this species may cause infestation, resulting in severe damage, especially in stored products, since this environment is very adequate for its proliferation (Silveira-Neto et al. 1976Silveira-Neto S, Nakano O, Barbin D, Villa Nova NA (1976) Manual de ecologia dos insetos. Ceres, Piracicaba, 419 pp., Osuji 1977Osuji FNC (1977) The development of Necrobia rufipes in dried fish and certain other commodities. Nigerian Journal of Science 15: 21-32., Gredilha et al. 2005Gredilha R, Saavedra PR, Guerim L, Lima AF, Serra-Freire NM (2005) Ocorrência de Oryzaephilus surinamensis (Linnaeus, 1758) (Coleoptera: Cucujidae) e Necrobia rufipes (DeGeer, 1775) (Coleoptera, Cleridae) infestando rações de animais domésticos. Entomology Veterinary 12(1): 95-103., Gredilha and Lima 2007Gredilha R, Lima AF (2007) First record of Necrobia rufipes (De Geer, 1775) (Coleoptera: Cleridae) associated with pet food in Brazil. Brazilian Journal of Biology 67(1): 187., Hasan et al. 2020Hasan MM, Athanassiou CG, Schilling MW, Phillips TW (2020) Biology and management of the red-legged ham beetle, Necrobia rufipes DeGeer (Coleoptera: Cleridae). Journal of Stored Products Research 88: 101635. https://doi.org/10.1016/j.jspr.2020.101635
https://doi.org/10.1016/j.jspr.2020.1016...
, Santos et al. 2020Santos AT, Pereira TN, Bicho CL (2020) Necrobia rufipes (DeGeer, 1775) (Coleoptera: Cleridae) Infesting Industrialized Foods for Pet Animals in Campina Grande, Paraiba State, Brazil. Entomological News 129: 81-85., Savoldelli et al. 2020Savoldelli S, Jucker C, Peri E, Arif MA, Guarino S (2020) Necrobia rufipes (De Geer) infestation in pet food packaging and setup of a monitoring trap. Insects 11: 623.). Moreover, N. rufipes is associated with human bodies (Iannacone 2003Iannacone J (2003) Antropofauna de importancia forense en un cadáver de cerdo en el Callao, Perú. Revista Brasileira de Zoologia 20(1): 85-90. https://doi.org/10.1590/S0101-81752003000100010
https://doi.org/10.1590/S0101-8175200300...
, Oliveira et al. 2012Oliveira RG, Rodrigues A, Oliveira-Costa J, Bastos CS, Generoso BC (2012) Entomofauna cadavérica no instituto médico legal do estado do Rio de Janeiro. Revista Eletrônica Novo Enfoque 15: 54-57.), carcasses of dogs, Canis domesticus Linnaeus, 1758 (Zahid et al. 2013Zahid M, Ali PA, Shah M, Sthanadar AA, Kausar A, Ilyas Ahmad A, Khalid S, Mehmood T (2013) Coleoptera species associated with dog (Canis domesticus L.) Cadever in tropical region of Mardan, Pakistan. International Journal of Biosciences 3(8): 150-153.), rabbits, Lepus cuniculus Linnaeus, 1758 (Al-Shareef and Al Mazyad 2017Al-Shareef LAH, Al-Mazyad MMF (2017) Beetles (Insecta, Coleoptera) associated with rabbit carcasses in three habitats in Jeddah, Kingdom of Saudi Arabia. Australian Journal of Basic and Applied Sciences 11(2): 139-145.), and pigs, Sus scrofa Linnaeus, 1758 (Carvalho et al. 2000Carvalho LML, Thyssen PJ, Linhares AX, Palhares FAB (2000) A Checklist of arthropods associated with pig carrion and human corpses in southeastern Brazil. Memórias do Instituto Oswaldo Cruz 95(1): 135-138. https://doi.org/10.1590/S0074-02762000000100023
https://doi.org/10.1590/S0074-0276200000...
, Bahillo de la Puebla and López-Colón 2006Bahillo de La Puebla P, López-Colón JI (2006) Los cléridos de la comunidad de Madrid (Coleoptera, Cleridae). Graellsia 62(Suppl.): 403-418., Rosa et al. 2011Rosa TA, Babata MLY, Souza CM, Sousa D, Mello-Patiu CA, Vaz-de-Melo FZ, Mendes J (2011) Arthropods associated with pig carrion in two vegetation profiles of cerrado in the state of Minas Gerais, Brazil. Revista Brasileira de Entomologia 55(3): 424-434.). The association with cadaveric remains was reported by Prins (1984Prins AJ (1984) Morphological and biological notes on some South African arthropods associated with decaying organic matter. II: the families Dermestidae, Cantharidae, Melyridae, Tenebrionidae, and Scarabaeidae (Coleoptera). Annals of the South African Museum 94: 203-304.) during the casein fermentation stage; by Kulshrestha and Satpathy (2001Kulshrestha P, Satpathy DK (2001) Use of beetles in forensic entomology. Forensic Science International 120: 15-17.) during the dry remains stage, and by Zahid et al. (2013Zahid M, Ali PA, Shah M, Sthanadar AA, Kausar A, Ilyas Ahmad A, Khalid S, Mehmood T (2013) Coleoptera species associated with dog (Canis domesticus L.) Cadever in tropical region of Mardan, Pakistan. International Journal of Biosciences 3(8): 150-153.) during the active decay stage, the advanced decay stage, and the dry stage of decomposition.
The main goal of this study was to estimate the biological parameters of N. rufipes in a laboratory setting, using four different temperatures and an artificial diet. From an applied perspective, this study provides important information for Medical-legal Forensic Entomology investigations, since it allows discrimination of life stages in different parameters, being the first recorded case with complete data on the life cycle of N. rufipes recorded for Brazil.
MATERIAL AND METHODS
Adults of N. rufipes were found in commercial dog food bags in a supermarket in Campina Grande, state of Paraíba, Brazil. Collected specimens were transferred to the Laboratory of Insect Systematics and Bioecology, Departamento de Biologia, Universidade Estadual da Paraíba (UEPB), where they were kept in plastic containers (20 x 20 x 10 cm) with hermetic sealing plastic lids in groups of 20 adults. One slice of bacon (4.0 x 3.0 x 0.5 cm), 1.8 g of home-made fish flour, and four pellets of meat-flavored dog food (from the same brand in which the insects were obtained) were provided to all insects (diet proposed by the authors).
Eggs were collected daily using a stereoscopic micros cope, brushes, and entomological clamps. A total of 160 eggs were placed in plastic containers (50 mL), lined with a piece of paper filter. The top of each container was covered with a piece of voile fabric tightened with rubber bands. The eggs were kept in four environmental chambers set at four diffe rent temperatures (20, 24, 28, and 32 °C) and rela tive humidity of 70%. Beside the containers with the eggs, a cotton ball soaked in the water was placed to maintain the humidity level in the B.O.D. chambers, and a thermo hygrometer was used to register possible alterations in temperature and humidity levels. Four groups of ten eggs were kept in each B.O.D. chamber (40 eggs per chamber).
After emergence, 0.45 g of fish flour, one slice of bacon (1.0 x 1.0 x 0.5 cm), and one pellet of meat-flavored dog food were provided to all larvae. Larval instars were determined through the identification of exuviae. Adults were kept individually in plastic containers (50 mL) covered with a piece of voile fabric tightened with rubber bands. The food provided to all adults was the same as previously provided to larvae. The development of the instars of N. rufipes was monitored daily.
The data were registered in spreadsheets and statistical analyses were carried out to assess whether there is a difference between the duration of each development phase according to the temperature of the environment where specimens were reared. Initially, a Shapiro-Wilk test was carried out to assess the assumption of normality of the distribution of the variable of duration of the stages of development. Then, for each stage of development, a Tukey test was applied to compare the duration of these stages according to the temperature conditions. All statistical analyses were carried out using the Table Curve 2D software.
RESULTS
Biological characterization
The eggs are transparent right after oviposition and their coloration changes from milky white to light brown as they are close to larvae hatching. The number of eggs oviposited varied substantially from three to approximately 15 eggs per group. It is possible that the number of eggs oviposited per group could exceed the maximum of 15, due to problems in visualizing the eggs a few hours after oviposition because they are transparent. Females tended to oviposit more eggs first on the pellets of dog food, and then on the slice of bacon (Fig. 1A).
Stages of development of Necrobia rufipes: (A) eggs laying on pellet of meat-flavored food for dogs; (B) first larval instar; (C) second larval instar; (D) third larval instar; (E) fourth larval instar; (F) pupal stage; (G) adult in dorsal view; (H) adult in lateral view;(I) adult, frontal view.
Necrobia rufipes has four larval instars. Right after emergence, the larva of the first instar is white with a dark brown head and supra-anal processes (Fig. 1B). The colo ration of the body of the larva changes from a light pink to darker tones throughout the second (Fig. 1C) and third instars (Fig. 1D), reaching a red-brownish color in the fourth instar (Fig. 1E). The head and the urogomphi also change in coloration throughout the second and third instars. These structures change in the first instar from dark brown to a reddish-brown in the fourth instar.
The larva goes through a pre-pupal stage (Fig. 1F), which is characterized by a short period of rest with no morphological changes in comparison to the fourth larval instar (last larval instar). All individuals that reached the adult stage were observed going through all four larval instars, pre-pupae, and pupae.
Larvae were observed feeding on and hiding in all three food items (fish flour, bacon slice, and dog food pellets) during the four first instars. However, the pre-pupae move to the fish flour or the pellet of dog food to pupate. A white adhering substance was secreted by the pre-pupae, forming a shell around it, where it remained throughout the pupal stage until the adult emerged.
Right after emergence, we observed that some adults presented light green bodies and beige legs, which differ from the characteristic color of the species (metallic blue body and reddish-orange legs) (Fig. 1G-I). It was also observed that adults remained inactive for a maximum of 1-3 days after emergence. After that period, the adults showed considerable agility and copulated frantically. We often observed more than one male trying to copulate with the same female, sometimes two and even three males on top of the same female. In some cases, some males mounted on other male individuals, even protruding the male genitalia, and others just mounted and descended without protruding the genitalia. Another behavior observed was the decapitation of adult individuals. Although there were food resources, the adults, males and females, were confined in containers, which leads us to hypothesize that the stress caused by confinement was responsible for the aggressive behavior.
Life cycle
The cycle from egg to adult of N. rufipes was completed at the four temperatures. The shortest mean duration of the embryonic development was observed at 24 °C, and the longest, at 20 °C. A reduction in 42.4% in the duration of this instar of development was verified after the increase in temperature from 20 to 32 °C. The mean duration of development at 20 °C differed significantly when compared to the temperatures of 24, 28, and 32 °C (Table 1).
Mean duration (in days) and standard deviation (±) of the development stages of Necrobia rufipes. Means followed by the same capital letters do not differ statistically by the Turkey test (p ≤ 0,05).
The larval instar presented a mean duration of 102.6, 67.6, 73.6 and 37.8 days at 20, 24, 28 and 32 °C, respectively. A reduction of 64.8 days can be observed with the increase in temperature from 20 to 32 °C, which can represent a decrease of approximately 63% in the duration of this instar.
The shortest mean duration for each of the four larval instars was observed at 32 °C. For the 1st, 2nd and 4th instars, the longest mean duration was registered at 20 °C, while for the 3rd instar it was at 28 °C. The mean duration of the 1st and the 2nd instars decreased gradually as the temperature increased. A similar pattern was verified between these instars (Table 1).
For the 1st instar, its mean duration at 20 °C differed significantly from the ones at 28 and 32 °C. For the 2nd instar, the temperatures of 20, 28 and 32 °C varied significantly among them. For the 3rd instar, there was no significant variation in the mean duration at 20 and 24 °C, but both differed from the results at 28 and 32 °C - these, on the other hand, varied significantly between them. For the 4th instar, the mean duration under the temperatures of 24, 28 and 32 °C did not present statistically significant difference. However, when the temperature was 20 °C, the development differed conside rably when compared to the other temperatures (Table 1).
The mean time of development of the pre-pupa was slower at 20 °C (with a mean duration of approximately 21 days) and faster at 32 °C (about seven days). Consequently, the mean duration at 20 °C varied significantly when compared to the other temperatures (Table 1). For this stage, we also verified that its mean duration decreased gradually with the increase in temperature.
The pupal stage had its shortest mean duration of development registered at 28 °C, and the longest, at 20 °C. However, there was no significant variation between 28 and 32 °C in this stage, whereas pupal development at 20 and 24 °C varied significantly, both between individual pupae and when compared to the other temperatures (Table 1).
In terms of the mean duration of the adult instar, a variation of 84 to 121 days can be observed, corresponding to the temperatures of 24 and 20 °C, respectively. There was, in this stage, a significant variation between the deve lopment at 20 °C when compared to the ones registered at 24, 28 and 32 °C - these presented no significant variation among them. The longest and the shortest mean durations of development from egg to adult (273.4 and 143.3 days) were registered at the temperatures of 20 and 32 °C, in that order. This corresponds to a reduction of 47.6% in the cycle duration. Regarding mortality found throughout the life cycle, it was observed that the highest rate was found at a 24 °C in the egg and 1st instar stages. Even though this temperature is indicated as ideal for rearing some insects, the egg and first instar stages are more susceptible to death.
DISCUSSION
The eggs of N. rufipes females were usually deposited on hard-to-reach places. This observation aligns with the findings of Hu et al. (2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.) and may be related to the females’ preference for oviposition sites that offer protection against solar exposure, mechanical shocks, and potential predators (Triplehorn and Johnson 2011Triplehorn CA, Johson NF (2011) Estudos dos insetos. Cengage Learning, São Paulo, 816 pp.). Oviposition in sheltered sites is possible due to the telescope shape of the ovipositor (posterior abdominal segments of females), which has also been observed in other families of Coleoptera (e.g., in Cerambycidae - Monné and Santos-Silva 2003Monné LM, Santos-Silva A (2003) Sinopse do gênero Strongylaspis Thomson, 1860 (Coleoptera, Cerambycidae, Prioninae, Macrotomini). Revista Brasileira de Entomologia 47(1): 31-47.).
Cannibalism in the larval stages, reported by Hu et al. (2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.), was not observed in our study. This may be because the larvae were individualized until the emergence of the adults. However, adults exhibited cannibalistic behavior, especially in breeding boxes where adults had been in storage for longer and did not copulate as often. This same behavior was observed by Hasan et al. (2020Hasan MM, Athanassiou CG, Schilling MW, Phillips TW (2020) Biology and management of the red-legged ham beetle, Necrobia rufipes DeGeer (Coleoptera: Cleridae). Journal of Stored Products Research 88: 101635. https://doi.org/10.1016/j.jspr.2020.101635
https://doi.org/10.1016/j.jspr.2020.1016...
).
After the larval stage, the pre-pupa started the process of finding and building shelter for its most critical and susceptible period, the pupal stage. They chose the pellets of dog food and fish flour for this purpose, and in both cases, it was possible to observe when the individuals pupated. After the adults emerged, they remained inactive for a few days (1-3), and some individuals did not have the distinctive coloration of the species in this phase. The initial absence of this distinctive coloration of newly emerged adults can be explained by the absence of the interaction between the light with the liquid adjacent to the cuticle of the insect, which is required for the coloration acquisition process in this species (Liu et al. 2009Liu F, Dong BQ, Liu XH, Zheng YM, Zi J (2009) Structural color change in longhorn beetles Tmesisternus isabellae. Optica Express 17(18): 16183-16191. https://doi.org/10.1364/OE.17.016183
https://doi.org/10.1364/OE.17.016183...
).
If we compare the complete cycle of development and reproduction of N. rufipes with that of other beetles, it is possible to analyze how these species behave under different temperature treatments. In a broader view of the complete cycle of development and reproduction of stored grain pest, studies carried out by Birch (1945Birch LC (1945) The influence of temperature, humidity and density on the oviposition of the small strain of Calandra oryzae L. and Rhizopertha dominica Fab (Coleoptera). Australian Journal of Experimental Biology and Medical Science 23: 197-203. https://doi.org/10.1038/icb.1945.31
https://doi.org/10.1038/icb.1945.31...
) with Rhizopertha dominica (Fabricius, 1792) (Coleoptera: Bostrycidae), and by Odeyemi and Hassan (1993Odeyemi OO, Hassan AT (1993) Influence of temperature, humidity and photoperiod on oviposition and larval development in Trogoderma granarium Everts (Coleoptera: Dermestidae). Applied Entomology and Zoology 28(3): 275-281.) with Trogoderma granarium Everts, 1898 (Coleoptera: Dermestidae), established that temperatures ranging from 26 to 35 °C are ideal for development, and reproduction.
However, the result obtained by Chen et al. (2015Chen H, Lin L, Xie M, Zhang G, Su W (2015) Influence of constant temperature on reproductive parameters of Holotrichia oblita (Coleoptera: Scarabaeidae). Journal of Insect Science 15(1): 93. https://doi.org/10.1093/jisesa/iev070
https://doi.org/10.1093/jisesa/iev070...
), who analyzed the influence of temperature on the development of Holotrichia oblita (Faldermann, 1835) (Coleoptera: Scarabeidae), demonstrated that the optimal temperature ranges from 20 to 25 °C. Taghizadeh et al. (2008Taghizadeh R, Fathipour Y, Kamali K (2008) Influence of temperature on life-table parameters of Stethorus gilvifrons (Mulsant) (Coleoptera: Coccinellidae) fed on Tetranychus urticae Koch. Journal of Applied Entomology 132: 638-645.), when examining the impacts of temperature on the life cycle of Stethorus gilvifrons (Mulsant, 1850) (Coleoptera: Coccinellidae), demonstrated that the highest fecundity occurred at 35 °C and that the insects successfully developed at temperatures from 15 to 35 °C, which corroborates the findings of Howe (1965Howe RW (1965) A summary of estimates of optimal and minimal conditions for population increase of some stored products insects. Journal Stored Product Research 1: 177-184.). The latter mentioned that for a species to be successful it must be able to not only survive and multiply when the conditions are favorable (temperatures from about 25 to 33 °C), but also to withstand when the conditions are unfavorable (temperatures ranging from 15 to 22 °C). In opposition to that, Fields (1992Fields PG (1992) The control of stored-product insect and mites with extreme temperatures. Journal Stored Product Research 28(2): 89-118.) argued that insects from stored products need a high minimum temperature to complete their development, and that an optimal temperature for that ranges from 25 to 33 °C.
If we consider that development efficiency is correlated with a shorter life cycle, temperature will always be the key factor for insects. This is clear both in the study of Kutcherov (2016Kutcherov D (2016) Temperature effects on the development, body size, and sex ratio of the walnut leaf beetle Gastrolina depressa (Coleoptera, Chrysomelidae). Jornal of Asia-Pacific Entomology 19: 153-158.) and in the present study. When analyzing the cycle of Gastrolina depressa (Baly, 1859) (Coleoptera: Chrysomelidae), Kutcherov concluded that development becomes faster as the temperature increases. This is consistent with the present study, where an increase in temperature from 20 to 32 °C shortened the development in 64.8 days. This result represents a decrease of approximately 63% in the duration of the larval instars.
Analyzing the studies that specifically used N. rufipes as a model, we observe a variation in temperatures ranging from 22 to 36 °C (Simmons and Ellington 1925Simmons P, Ellington GW (1925) The ham beetle, Necrobia rufipes De Geer. Journal of Agricultural Research 30: 845-863., Ashman 1963Ashman F (1963) Factors affecting the abundance of the copra beetle Necrobia rufipes (DeGeer) (Coleoptera: Cleridae). Bulletin of Entomological Research 53: 671-680., Osuji 1975Osuji FNC (1975) The effects of salt treatment of fish on the developmental biology of Dermestes maculatus (Coleoptera, Dermestidae) and Necrobia rufipes (Cleridae). Entomologia Experimentalis et Applicata 18: 472-479., 1977, Hasan and Phillips 2010Hasan MM, Phillips TW (2010) Mass-rearing of the red-legged ham beetle, Necrobia rufipes DeGeer (Coleoptera: Cleridae) for laboratory research. Journal of Stored Products Research 46: 38-42., Hu et al. 2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.). Hu et al. (2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.) established six temperatures for the study of the development of N. rufipes: 22, 25, 28, 31, 34 and 36 °C, with 70% humidity for all temperatures. In their results, the shortest life cycle was found when individuals were exposed to 36 °C and the longest one was found at 22 °C, resulting in 31.2 and 121.96 days of life, respectively.
When comparing the results of Hu et al. (2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.) with the data of the present study, we noticed that it had a great variation in days even when the temperatures were equal. For instance, at 28 °C, we found an average variation of 86.2 days, whereas Hu et al. (2020) observed 50.61 in their study.
The temperature of 20 °C in the present study, when compared to 22 °C in the study of Hu et al. (2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.), even with a difference of 2 °C, showed an approximate value of 121 (average) and 121.96 days of development, respectively. For the other established temperatures here, 24 and 32 °C, we had an average of 84 and 87.9 days. With similar temperatures (25, 31 and 34 °C), these authors found 66.16, 38.26 and 37.97 days, respectively.
The mortality rates in the present study were higher in the egg and 1st larval instar, at 24 °C. This stands in contradiction with the findings of other studies (Hu et al. 2020Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14., Milanez and Parra 2000Milanez JM, Parra JRP (2000) Biologia e exigências térmicas de Diabrotica speciosa (Germar) (Coleoptera: Chrysomelidae) em laboratório. Anais da Sociedade Entomológica do Brasil 29(1): 23-29., Panizzi and Parra 2009Panizzi AR, Parra JRP (2009) Bioecologia e nutrição de insetos: base para o manejo integrado de pragas. Embrapa Informação Tecnológica, Brasília, 1164 pp.), which suggest that 25 °C is ideal for the development of insects. As portrayed in Fig. 2 (24 °C), high mortality rates were observed at 24 °C: 30% of the subjects were dead in the egg stage, and 78.6% in the 1st larval instar. This corresponds to more than 75% of the total population.
Survival of the development instars of Necrobia rufipes at the different temperatures: (A) 20 °C, (B) 24 °C, (C) 28 °C, and (D) 32 °C.
The highest rates of mortality, considering the four temperatures to which the subjects were exposed, were observed in the egg and 1st larval instar (Fig. 2). This correlates with nutrient deficiency during maternal nutrition, such as the absence of sterols (responsible for reproduction, oogenesis, lipoprotein transport, sclerotization of the cuticle, precursor of steroid hormones, and growth of immature forms), and a possible low level of phagostimulants (physical and chemical), present in the diet offered to the 1st instar larvae (Panizzi and Parra 2009Panizzi AR, Parra JRP (2009) Bioecologia e nutrição de insetos: base para o manejo integrado de pragas. Embrapa Informação Tecnológica, Brasília, 1164 pp.).
The diet chosen for the maintenance of adult and immature individuals followed the criteria of previous studies (Ashman 1963Ashman F (1963) Factors affecting the abundance of the copra beetle Necrobia rufipes (DeGeer) (Coleoptera: Cleridae). Bulletin of Entomological Research 53: 671-680., Hasan and Phillips 2010Hasan MM, Phillips TW (2010) Mass-rearing of the red-legged ham beetle, Necrobia rufipes DeGeer (Coleoptera: Cleridae) for laboratory research. Journal of Stored Products Research 46: 38-42., Osuji 1975Osuji FNC (1975) The effects of salt treatment of fish on the developmental biology of Dermestes maculatus (Coleoptera, Dermestidae) and Necrobia rufipes (Cleridae). Entomologia Experimentalis et Applicata 18: 472-479., Simmons and Ellington 1925Simmons P, Ellington GW (1925) The ham beetle, Necrobia rufipes De Geer. Journal of Agricultural Research 30: 845-863.), which showed satisfactory results with bacon, ham, dog food pellets and even dried fish meal. Although, observations made by Hasan et al (2022Hasan MM, Aikins MJ, Mahroof RM, Phillips TW (2022) Effects of diet and temperature on the life history of the Redlegged Ham Beetle (Coleoptera: Cleridae). Environmental Entomology 51(1): 278-285. https://doi.org/10.1093/ee/nvab116
https://doi.org/10.1093/ee/nvab116...
) indicated that copra is inferior as a food source for N. rufipes growth and development. The intention was to provide satisfactory quantitative and qualitative food, in order to eliminate the mortality effects caused by a nutrient-poor diet. Therefore, we hypothesize that the high mortality rate is due to the previous environment, in which the adults were confined to a bag of feed, where they did not have access to a balanced diet. The effects of those conditions were noticed in the early life stages of the first generation in the laboratory.
Ultimately, it was shown that temperature had an impact on the rate of development for every stage examined. We confirmed that higher temperatures cause the rate of development to rise and the duration of the immature and adult stages to decrease. The pest insects from stored grains’ great adaptability to temperature variation can be used to explain why N. rufipes developed to completion at 20 and 32 °C. Therefore, we draw the conclusion that all the temperatures examined permit N. rufipes immature instars to fully grow, giving rise to morpho physiologically viable adults.
ACKNOWLEDGEMENT
The authors are grateful to the Centro de Assessoria de Publicação Acadêmica (CAPA), in the person of director Ron Martinez for the translation of the article; Samara M.M. Andrade for reviewing the article, Antônio A. dos Santos for help with the figures, Marcelo E. Borges for help with data reanalysis, and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, processes 127348/2012-3, 137163/2013-4) for providing scholarships to the first author.
- Al-Shareef LAH, Al-Mazyad MMF (2017) Beetles (Insecta, Coleoptera) associated with rabbit carcasses in three habitats in Jeddah, Kingdom of Saudi Arabia. Australian Journal of Basic and Applied Sciences 11(2): 139-145.
- Ashman F (1963) Factors affecting the abundance of the copra beetle Necrobia rufipes (DeGeer) (Coleoptera: Cleridae). Bulletin of Entomological Research 53: 671-680.
- Bahillo de La Puebla P, López-Colón JI (2006) Los cléridos de la comunidad de Madrid (Coleoptera, Cleridae). Graellsia 62(Suppl.): 403-418.
- Birch LC (1945) The influence of temperature, humidity and density on the oviposition of the small strain of Calandra oryzae L. and Rhizopertha dominica Fab (Coleoptera). Australian Journal of Experimental Biology and Medical Science 23: 197-203. https://doi.org/10.1038/icb.1945.31
» https://doi.org/10.1038/icb.1945.31 - Carvalho LML, Thyssen PJ, Linhares AX, Palhares FAB (2000) A Checklist of arthropods associated with pig carrion and human corpses in southeastern Brazil. Memórias do Instituto Oswaldo Cruz 95(1): 135-138. https://doi.org/10.1590/S0074-02762000000100023
» https://doi.org/10.1590/S0074-02762000000100023 - Chen H, Lin L, Xie M, Zhang G, Su W (2015) Influence of constant temperature on reproductive parameters of Holotrichia oblita (Coleoptera: Scarabaeidae). Journal of Insect Science 15(1): 93. https://doi.org/10.1093/jisesa/iev070
» https://doi.org/10.1093/jisesa/iev070 - Fields PG (1992) The control of stored-product insect and mites with extreme temperatures. Journal Stored Product Research 28(2): 89-118.
- Gerstmeier R, Cupello M (2024) Cleridae. Brazilian Zoology Group (Ed.) Catálogo Taxonômico da Fauna do Brasil. http://fauna.jbrj.gov.br/fauna/faunadobrasil/206623 [Accessed: 02/09/2024]
» http://fauna.jbrj.gov.br/fauna/faunadobrasil/206623 - Goff ML (1991) Comparison of insect species associated with decomposing remains recovered inside dwellings and outdoors on the island of Oahu, Hawaii. Journal of Forensic Sciences 36: 748-753.
- Gredilha R, Saavedra PR, Guerim L, Lima AF, Serra-Freire NM (2005) Ocorrência de Oryzaephilus surinamensis (Linnaeus, 1758) (Coleoptera: Cucujidae) e Necrobia rufipes (DeGeer, 1775) (Coleoptera, Cleridae) infestando rações de animais domésticos. Entomology Veterinary 12(1): 95-103.
- Gredilha R, Lima AF (2007) First record of Necrobia rufipes (De Geer, 1775) (Coleoptera: Cleridae) associated with pet food in Brazil. Brazilian Journal of Biology 67(1): 187.
- Gunter NL, Leavengood JM, Bartlett JS, Erıc G, Chapman EG, Cameron S (2013) A molecular phylogeny of the checkered beetles and a description of Epiclininae a new subfamily (Coleoptera: Cleroidea: Cleridae). Systematic Entomology 38: 626-636. https://doi.org/10.1111/syen.12019
» https://doi.org/10.1111/syen.12019 - Hasan MM, Aikins MJ, Mahroof RM, Phillips TW (2022) Effects of diet and temperature on the life history of the Redlegged Ham Beetle (Coleoptera: Cleridae). Environmental Entomology 51(1): 278-285. https://doi.org/10.1093/ee/nvab116
» https://doi.org/10.1093/ee/nvab116 - Hasan MM, Athanassiou CG, Schilling MW, Phillips TW (2020) Biology and management of the red-legged ham beetle, Necrobia rufipes DeGeer (Coleoptera: Cleridae). Journal of Stored Products Research 88: 101635. https://doi.org/10.1016/j.jspr.2020.101635
» https://doi.org/10.1016/j.jspr.2020.101635 - Hasan MM, Phillips TW (2010) Mass-rearing of the red-legged ham beetle, Necrobia rufipes DeGeer (Coleoptera: Cleridae) for laboratory research. Journal of Stored Products Research 46: 38-42.
- Howe RW (1965) A summary of estimates of optimal and minimal conditions for population increase of some stored products insects. Journal Stored Product Research 1: 177-184.
- Hu G, Wanga M, Wanga Y, Tangb H, Chena R, Zhanga Y, et al. (2020) Development of Necrobia rufipes (De Geer, 1775) (Coleoptera, Cleridae) under constant temperatures and its implication in forensic entomology. Forensic Science International 311: 1-14.
- Iannacone J (2003) Antropofauna de importancia forense en un cadáver de cerdo en el Callao, Perú. Revista Brasileira de Zoologia 20(1): 85-90. https://doi.org/10.1590/S0101-81752003000100010
» https://doi.org/10.1590/S0101-81752003000100010 - Key B (1985) Scope and applications of forensic entomology. Annual Review Entomology 30: 137-154.
- Kulshrestha P, Satpathy DK (2001) Use of beetles in forensic entomology. Forensic Science International 120: 15-17.
- Kutcherov D (2016) Temperature effects on the development, body size, and sex ratio of the walnut leaf beetle Gastrolina depressa (Coleoptera, Chrysomelidae). Jornal of Asia-Pacific Entomology 19: 153-158.
- Liu F, Dong BQ, Liu XH, Zheng YM, Zi J (2009) Structural color change in longhorn beetles Tmesisternus isabellae Optica Express 17(18): 16183-16191. https://doi.org/10.1364/OE.17.016183
» https://doi.org/10.1364/OE.17.016183 - Milanez JM, Parra JRP (2000) Biologia e exigências térmicas de Diabrotica speciosa (Germar) (Coleoptera: Chrysomelidae) em laboratório. Anais da Sociedade Entomológica do Brasil 29(1): 23-29.
- Monné LM, Santos-Silva A (2003) Sinopse do gênero Strongylaspis Thomson, 1860 (Coleoptera, Cerambycidae, Prioninae, Macrotomini). Revista Brasileira de Entomologia 47(1): 31-47.
- Odeyemi OO, Hassan AT (1993) Influence of temperature, humidity and photoperiod on oviposition and larval development in Trogoderma granarium Everts (Coleoptera: Dermestidae). Applied Entomology and Zoology 28(3): 275-281.
- Okutaner AY (2020) First cytogenetic information on four checkered beetles (Coleoptera, Cleridae). Comparative Cytogenetics 14(4): 541-547. https://doi.org/10.3897/CompCytogen.v14.i4.55358
» https://doi.org/10.3897/CompCytogen.v14.i4.55358 - Oliveira RG, Rodrigues A, Oliveira-Costa J, Bastos CS, Generoso BC (2012) Entomofauna cadavérica no instituto médico legal do estado do Rio de Janeiro. Revista Eletrônica Novo Enfoque 15: 54-57.
- Opitz W (2002) Cleridae Latreille 1804. In: Arnett RH Jr, Thomas MC, Skelley PE, Frank JH (Eds) American Beetles. CRC Press, Boca Raton, vol. 2, 267-280.
- Opitz W (2010) Classification, natural history, phylogeny, and subfamily composition of the Cleridae and generic content of the subfamilies (Coleoptera: Cleroidea). Entomologica Basiliensia et Collections Frey 32: 31-128.
- Osuji FNC (1975) The effects of salt treatment of fish on the developmental biology of Dermestes maculatus (Coleoptera, Dermestidae) and Necrobia rufipes (Cleridae). Entomologia Experimentalis et Applicata 18: 472-479.
- Osuji FNC (1977) The development of Necrobia rufipes in dried fish and certain other commodities. Nigerian Journal of Science 15: 21-32.
- Panizzi AR, Parra JRP (2009) Bioecologia e nutrição de insetos: base para o manejo integrado de pragas. Embrapa Informação Tecnológica, Brasília, 1164 pp.
- Prins AJ (1984) Morphological and biological notes on some South African arthropods associated with decaying organic matter. II: the families Dermestidae, Cantharidae, Melyridae, Tenebrionidae, and Scarabaeidae (Coleoptera). Annals of the South African Museum 94: 203-304.
- Rosa TA, Babata MLY, Souza CM, Sousa D, Mello-Patiu CA, Vaz-de-Melo FZ, Mendes J (2011) Arthropods associated with pig carrion in two vegetation profiles of cerrado in the state of Minas Gerais, Brazil. Revista Brasileira de Entomologia 55(3): 424-434.
- Santos AT, Pereira TN, Bicho CL (2020) Necrobia rufipes (DeGeer, 1775) (Coleoptera: Cleridae) Infesting Industrialized Foods for Pet Animals in Campina Grande, Paraiba State, Brazil. Entomological News 129: 81-85.
- Savoldelli S, Jucker C, Peri E, Arif MA, Guarino S (2020) Necrobia rufipes (De Geer) infestation in pet food packaging and setup of a monitoring trap. Insects 11: 623.
- Silveira-Neto S, Nakano O, Barbin D, Villa Nova NA (1976) Manual de ecologia dos insetos. Ceres, Piracicaba, 419 pp.
- Simmons P, Ellington GW (1925) The ham beetle, Necrobia rufipes De Geer. Journal of Agricultural Research 30: 845-863.
- Ślipiński SA, Leschen RAB, Lawrence JF (2011) Order Coleoptera Linnaeus, 1758. Animal biodiversity: an outline of higher-level classification and survey of taxonomic richness. Zootaxa 3148: 203-208.
- Taghizadeh R, Fathipour Y, Kamali K (2008) Influence of temperature on life-table parameters of Stethorus gilvifrons (Mulsant) (Coleoptera: Coccinellidae) fed on Tetranychus urticae Koch. Journal of Applied Entomology 132: 638-645.
- Tomberlin J, Mohr R, Benbow M, Tarone A, VanLaerhoven S (2011) A roadmap for bridging basic and applied research in forensic entomology. Annual Review of Entomology 56: 401-421.
- Triplehorn CA, Johson NF (2011) Estudos dos insetos. Cengage Learning, São Paulo, 816 pp.
- Zahid M, Ali PA, Shah M, Sthanadar AA, Kausar A, Ilyas Ahmad A, Khalid S, Mehmood T (2013) Coleoptera species associated with dog (Canis domesticus L.) Cadever in tropical region of Mardan, Pakistan. International Journal of Biosciences 3(8): 150-153.
- Zhang S-Q, Che L-H, Li Y, Liang D, Pang H, Ślipiński A, Zhang P (2018) Evolutionary history of Coleoptera revealed by extensive sampling of genes and species. Nature Communications 9: 205.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, processes 127348/2012-3, 137163/2013-4. Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, processes 127348/2012-3, 137163/2013-4) for providing scholarships to the first author.
ADDITIONAL NOTES
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ZooBank register
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How to cite this article
dos Santos AT, Bicho CL (2024) Biological characterization and life cycle of Necrobia rufipes (Coleoptera: Cleridae). Zoologia 41: e23007. https://doi.org/10.1590/S1984-4689.v41.e23007 -
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Sociedade Brasileira de Zoologia at Scientific Electronic Library Online (https://www.scielo.br/zool)
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Data availability
Data citations
Gerstmeier R, Cupello M (2024) Cleridae. Brazilian Zoology Group (Ed.) Catálogo Taxonômico da Fauna do Brasil. http://fauna.jbrj.gov.br/fauna/faunadobrasil/206623 [Accessed: 02/09/2024]
Publication Dates
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Publication in this collection
23 Sept 2024 -
Date of issue
2024
History
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Received
20 Feb 2023 -
Accepted
03 July 2024