Seasonal variation in the leaf-litter frog community (Amphibia: Anura) from an Atlantic Forest Area in the Salto Morato Natural Reserve, southern Brazil

Abstract

In this study we provide the first data regarding community parameters of leaf-litter anurans inhabiting a forest floor in the state of Paraná, southern Brazil, including information on community species richness, composition, specific density and biomass. Our study was conducted at Salto Morato Natural Reserve using forty plots of 4 x 4 m for each one of the four seasons (winter, spring, summer and autumn), totaling 2.560 m² of forest floor sampled. We sampled a total of 96 frogs inhabiting the forest floor, belonging to seven species: Brachycephalus hermogenesi (Giaretta & Sawaya, 1998), Ischnocnema guentheri (Steindachner, 1864), Haddadus binotatus (Spix, 1824), Leptodactylus gr. marmoratus, Physalaemus spiniger (Miranda-Ribeiro, 1926), Proceratophrys boiei (Wied-Neuwied, 1824), and Rhinella abei (Baldissera, Caramaschi & Haddad, 2004). The overall frog density in the forest floor was 3.73 ind/100m², with I. guentheri (1.37 ind/100 m²) being the most common species and R. abei (0.19 ind/100 m²), the rarest. The estimated overall frog mass in the community was 3.29 g. The abundance, richness and density varied consistently among the four seasons sampled, with the highest values occurring in the spring and summer seasons.

Atlantic Rainforest; density; richness; seasonality

ECOLOGY

Seasonal variation in the leaf-litter frog community (Amphibia: Anura) from an Atlantic Forest Area in the Salto Morato Natural Reserve, southern Brazil

Manuela Santos-PereiraI, ¹; Adriane Candaten^II; Douglas Milani^III; Frederico B. Oliveira^II; Joana Gardelin^II; Carlos F. D. da Rocha^I

^IDepartamento de Ecologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro. Rua São Francisco Xavier 524, 20550-013 Rio de Janeiro, RJ, Brazil

^IICurso de Ciências Biológicas, Instituto de Ciências Biológicas, Universidade de Passo Fundo. Campus I, Rodovia BR 285, 99001-970 Passo Fundo, RS, Brazil

^IIIParque Nacional da Serra dos Órgãos. Avenida Rotariana, Soberbo, 25960-602 Teresópolis, RJ, Brazil

ABSTRACT

In this study we provide the first data regarding community parameters of leaf-litter anurans inhabiting a forest floor in the state of Paraná, southern Brazil, including information on community species richness, composition, specific density and biomass. Our study was conducted at Salto Morato Natural Reserve using forty plots of 4 x 4 m for each one of the four seasons (winter, spring, summer and autumn), totaling 2.560 m² of forest floor sampled. We sampled a total of 96 frogs inhabiting the forest floor, belonging to seven species: Brachycephalus hermogenesi (Giaretta & Sawaya, 1998), Ischnocnema guentheri (Steindachner, 1864), Haddadus binotatus (Spix, 1824), Leptodactylus gr. marmoratus, Physalaemus spiniger (Miranda-Ribeiro, 1926), Proceratophrys boiei (Wied-Neuwied, 1824), and Rhinella abei (Baldissera, Caramaschi & Haddad, 2004). The overall frog density in the forest floor was 3.73 ind/100m², with I. guentheri (1.37 ind/100 m²) being the most common species and R. abei (0.19 ind/100 m²), the rarest. The estimated overall frog mass in the community was 3.29 g. The abundance, richness and density varied consistently among the four seasons sampled, with the highest values occurring in the spring and summer seasons.

Key words: Atlantic Rainforest; density; richness; seasonality.

Habitat reduction and degradation, especially in tropical forest areas, has caused a worrisome global loss of species (BENÍTEZ-MALVIDO & MARTÍNEZ-RAMOS 2003, GARDNER et al. 2007, TODD & ANDREWS 2007). The Brazilian Atlantic Forest has a high biodiversity and high endemism rates, sheltering approximately 7% of the world's plant and animal species. Due to human action, it is among the most threatened biomes, with only about 12% of the original area remaining (QUINTELA 1990, MYERS et al. 2000, RIBEIRO et al. 2009). Regarding amphibians, Brazil is the most species rich country, reaching almost 900 recognized species (SBH 2010). Only in the Atlantic Rainforest Biome, there are more than 400 registered amphibian species, with most of them endemic to this biome (HADDAD et al. 2008).

Several studies carried out in different tropical forests throughout the world provide data on richness, composition and density of frogs living on the leaf-litter layer of the forest floor (e.g., BROWN & ALCALA 1961, SCOTT 1976, 1982, FAUTH et al. 1989, ALLMON 1991, GASCON 1996). However, for the Atlantic Rainforest, there are few studies providing data on leaf-litter frog species composition and richness (HEYER et al. 1990, HADDAD & SAZIMA 1992, GIARETTA et al. 1997, 1999, MACHADO et al. 1999, ROCHA et al. 2000, 2001, POMBAL & GORDO 2004, ROCHA et al. 2007, SIQUEIRA et al. 2009). Only seven studies present data on relative densities of frogs in leaf litter communities already studied (GIARETTA et al. 1997, 1999, ROCHA et al. 2000, 2001, 2007, ALMEIDA-GOMES et al. 2008, SIQUEIRA et al. 2009).

The species composition and abundance of leaf-litter frogs can be influenced by several factors, such as altitudinal gradients (BROWN & ALCALA 1961, FAUTH et al. 1989, GIARETTA et al. 1999) and seasons (SCOTT 1976, GIARETTA et al. 1999, VONESH 2001). Although studies of leaf-litter frog communities in tropical forests are continuously increasing during recent years within Brazil (e.g., ALMEIDA-GOMES et al. 2008, SIQUEIRA et al. 2009), only one study discusses the effects of seasonality on the parameters of these communities (GIARETTA 1999). The same gap of knowledge regarding seasonal trends in the leaf litter frog communities is observed worldwide, with only a few available studies in Central America (TOFT 1980a, WATLING & DONNELLY 2002) and Asia (WATANABE et al. 2005).

In this paper, we study the influence of seasonality on the community parameters, such as abundance, richness and density, of leaf-litter frogs in the Salto Morato Nature Reserve. We also compared these values to others forests in Brazil and worldwide. To our knowledge, this study is the first one providing information regarding community parameters of leaf-litter anurans inhabiting a forest floor in the state of Paraná, southern Brazil.

MATERIAL AND METHODS

The study was carried out in the Reserva Particular do Patrimônio Natural Salto Morato (25°09'S, 48°16' a 48°20'W), municipality of Guaraqueçaba, state of Paraná, southern Brazil. The area, with 2.340 ha, is located within the Área de Preservação Ambiental de Guaraqueçaba, which is part of the largest currently existing remnant of Atlantic Rainforest in Brazil (FUNDAÇÃO SOS MATA ATLÂNTICA 1998). The average annual temperature is 21°C. The rainfall rates are high, with more than 2,000 mm per year and annual average relative air humidity is 85%. The altitude varies between 25-930 m. (FBPN 1995) (Fig. 1).

Four surveys were conducted from July 2009 to April 2010, with sampling every three months, covering the four seasons (winter, spring, summer and autumn), in a forest belt, located between 200 and 300 m of altitude. To sample the community of frogs we used the large-plot method sampling (ROCHA et al. 2001). We established 160 quadrants of 4 x 4 m on the forest floor, totaling 2,560 m² of area sampled for the whole study. The corners of each plot were marked with wooden stakes and the plot was completely surrounded by a 50 cm high screen. The screen was buried in the ground to prevent the frogs from escaping. Air temperature (°C) and air humidity (%) were determined prior to sampling a certain plot. After sunset, each plot was carefully reviewed by a team of four researchers using head lamps. During searches, the crew moved up the entire plot on hands and knees, side-by-side. All leaves, fallen branches and stones inside the plot were overturned and the crevices of rocks and spaces between the roots of trees were checked, searching for frogs. Searches in each plot lasted about half an hour.

Frogs found were collected, identified and deposited in the Museu de História Natural Capão da Imbuia, Curitiba, state of Paraná, and in the Museu Nacional, Rio de Janeiro, state of Rio de Janeiro. Snout-vent length (SVL in mm) of all frogs were measured using a digital caliper; individual body mass (to the nearest 0.1 g) was obtained using a Pesola dynamometer.

The ordination was based on a Bray-Curtis dissimilarity matrix of ecological distance (FAITH et al. 1987). Density (ind/100 m²) and biomass (g/ha) were estimated for each frog species each season. The composition of community of leaf-litter frogs among seasons was analyzed using non-metric multidimensional scaling (NMDS) (CLARKE 1993). The effect of variables (temperature and air humidity) on the parameters of the community of leaf-litter frogs was evaluated by regression analysis (ZAR 1984). Both tests were performed in SYSTAT 11.0 (WILKINSON 2004).

RESULTS

We recorded seven frog species associated with the leaf-litter of the forest floor in Reserva Salto Morato: Ischnocnema guentheri (Steindachner, 1864), Brachycephalus hermogenesi (Giaretta & Sawaya, 1998) (Brachycephalidae), Leptodactylus gr. marmoratus (Leptodactylidae), Physalaemus spiniger (Miranda-Ribeiro, 1926) (Leiuperidae), Proceratophrys boiei (Wied-Neuwied, 1824) (Cycloramphidae), Haddadus binotatus (Spix, 1824) (Craugastoridae), and Rhinella abei (Baldissera, Caramaschi & Haddad, 2004) (Bufonidae) (Tab. I).

In 160 plots sampled, the plots percentage without frogs was 52% and the average of frogs per plot was 1.6. The composition and density of the leaf-litter frogs in the community varied among seasons, with the highest values in spring and summer seasons (Tab. I, Fig. 2). The air temperature affected significantly the overall frog abundance (R² = 0.098, F_{1, 143} = 15.513, p < 0,001) in local community. The moisture, in contrast, did not affect overall frog abundance (R² = 0.001, F_{1, 143} = 0.082, p = 0.774). The NMDS showed a clustering of summer and spring, although there was no grouping between winter and autumn (Fig. 3).

Considering all seasons combined, the estimated overall frog density of the leaf-litter frog community the Reserva Salto Morato was 3.73 ind/100 m² (Tab. I). Ischnocnema guentheri had the highest abundance and density in three of the four seasons sampled (winter, N = 5, 0.78 ind/100 m²; spring, N = 13, 2.03 ind/100 m² and summer, N = 14, 3.44 ind/100 m²), while L. gr. marmoratus had the highest abundance (N = 6) and density (0.94 ind/100 m²) in autumn (Tab. I). The lower abundance (N = 1) and density (0.16 ind/100 m²) was recorded for B. hermogenesi in the winter, H. binotatus and R. abei during the spring, B. hermogenesi and R. abei in summer and H. binotatus and B. hermogenesi during autumn (Tab. I).

The seven species recorded in the leaf-litter frog community of Reserva Salto Morato showed differences in biomass among seasons. The overall frogs mass recorded in the community of leaf-litter frogs at Salto Morato Reserve was 842.4 g/ha (Tab. I).

In terms of frog biomass in the community, Ischnocnema guentheri was the frog presenting the highest mass during the winter (181.2 g/ha) and summer (175.2 g/ha), while biomass of R. abei dominated during spring and autumn. The lowest biomass in the four seasons sampled was from the species B. hermogenesi (winter = 1.6 g/ha, spring = 8.7 g/ha, summer = 0.8 g/ha and autumn = 0.2 g/ha) (Tab. I).

DISCUSSION

The species richness of leaf-litter frogs (seven species) observed in Salto Morato forest can be considered relatively low when compared with some other Atlantic Rainforest areas, such as the forests in the states of Rio de Janeiro (Reserva Ecológica de Guapiaçu, Cahoeiras de Macacu Municipality = 12 species, ROCHA et al. 2007; Parque Estadual dos Três Picos, Cahoeiras de Macacu Municipality = 16 species, SIQUEIRA et al. 2009) and São Paulo (Parque Florestal do Itapetinga, Atibaia Municipality = 16 species, GIARETTA et al. 1999).

In the Atlantic Rainforest biome, there are latitudinal differences regarding biological diversity for different animal groups (ROCHA et al. 2007). Along the large latitudinal range of the biome (from 5° to 30°S), species diversity and rates of endemism tend to be higher in its "middle portion" (states of Rio de Janeiro, Espírito Santo, eastern São Paulo and southeastern Minas Gerais) for lizards (VANZOLINI 1988), birds (SCOTT & BROOKE 1985, COLLAR et al. 1992, WEGW & LONG 1995), mammals (COSTA et al. 2000) and butterflies (BROWN & FREITAS 2000). Unfortunately, there is no study evaluating this trend for leaf-litter frog communities which restrains us from making comparisons. Supposedly, the low species richness of the Salto Morato forest compared to the most northward forests in the biome (e.g., GIARETTA et al. 1999, ROCHA et al. 2007) can be attributed to latitudinal differences which, in turn, may reflect less favorable climatic conditions, especially during seasons as winter. In fact, in Salto Morato forest, species richness, composition and densities of leaf litter frogs varied among seasons (see below), with winter accounting for nearly half (four species) of that found during the summer (seven species).

All frogs species recorded in the study area were endemic to the Atlantic Rainforest biome and most of them have wide distribution throughout this biome (FROST 2010), with some species occurring in leaf-litter frog communities in southeastern Brazil forests (GIARETTA et al. 1997, 1999, ROCHA et al. 2000, 2007, VAN SLUYS et al. 2007, ALMEIDA-GOMES et al. 2008, SIQUEIRA et al. 2009).

Our data showed that the parameters of leaf-litter frog community of Salto Morato forest varied among seasons. The highest values recorded in spring and summer on leaf-litter frog community parameters, as species richness, abundances and densities, can be appreciated in table I. Thus, as evidenced by the NMDS ordination, there was clustering between spring and summer, which indicates that the parameters of leaf-litter frog community in these seasons are similar, indicating an influence of seasonality in the leaf-litter frog community of the studied area. Seasonal variation in leaf-litter frogs communities has also been reported in other studies in Brazil (GIARETTA et al. 1999), South America (TOFT 1980a) Central America (TOFT 1980b, WATLING & DONNELLY 2002), and Asia (WATANABE et al. 2005), although the knowledge regarding this trend for tropical forests is still limited. In Paraná, seasonal variation in frog species composition was found in three studies (CONTE & MACHADO 2005, CONTE & ROSSA-FERES 2006, 2007), however the authors focus on arboreal, terrestrial and semi-arboreal and aquatic species frog communities, not considering the leaf-litter frog community.

Our data showed that the community of leaf-litter frogs in Reserva Salto Morato were affected by air temperature but not by air humidity. Air temperature explained approximately 10% of the variation in frog density and occurrence, which indicates that other environmental factors also act conjunctly to affect in an important way these community parameters. In tropical forests with wet and dry seasons defined, the precipitation affects significantly the abundance and diversity of frog species living in leaf litter (ALLMON 1991, VONESH 2001). In our study area, we observed high rainfall rates and no clear dry season (FBPN 1995). This fact may explain in part as air temperature appears to explain partially seasonal variation in the community of litter frogs at Salto Morato Reserve, whereas air humidity effect did not appear.

The two most abundant species, I. guentheri and L. gr. marmoratus, accounted for 37% and 31% of the total number of frogs recorded, respectively, suggesting that these two frogs are the dominant species in the local leaf-litter frog community of the area studied. However, it seems to be a trend on communities of leaf-litter frogs being dominated by one to three species belonging to Brachycephalidae and Leptodactylidae families (e.g., GIARETTA et al. 1997, 1999, ROCHA et al. 2000, VAN SLUYS et al. 2007, SIQUEIRA et al. 2009). In the present study B. hermogenesi (third most abundant species) was recorded for the first time in Paraná, extending its distribution to 120 km south of Ribeirao Grande and 130 km southwest of the Juréia-Itatins, both localities in the state of São Paulo. The rarer species in the leaf-litter frog community studied was R. abei (0.19 ind/100 m²), suggesting that relatively large bodied frogs tend to occur in smaller numbers in leaf-litter frog community. In fact, ROCHA et al. (2007) studying a leaf-litter frog community in a forest at the state of Rio de Janeiro (Reserva de Guapiaçu) suggested a biological trend on the relationship between frog specific body size and their respective abundances in the forest floor.

Densities of frogs in this study (3.73 ind/100 m²) was lower compared to other studies in Atlantic Forest areas in South America (GIARETTA et al. 1999, 4.6 ind/100 m²; ROCHA et al. 2001, 5.9 ind/100m²; ROCHA et al. 2007, 8.43 ind/100 m²; ALMEIDA-GOMES et al. 2008, 4.5 ind/100 m²; and SIQUEIRA et al. 2009, 17.1 ind/100 m²) and in Amazon forest (ALLMON 1991, 4.76 ind/100 m²). However, density was higher than those found by GIARETTA et al. (1997), 1.4 ind/100 m², - although, these authors sampled during the dry/cold season, which may have contributed to the low density of frogs they found. The leaf litter frog density values at Salto Morato forest were also lower when compared with other forests in the world, as areas in Costa Rica (LIEBERMAN 1986, 13.2 ind/100 m²), Panama (TOFT 1980b, 11.8 ind/100 m²) and Cameroon (SCOTT 1982, 9.4 ind/100 m²), but higher than those recorded in Borneo (LLOYD et al. 1968, 1.09 ind/100 m²) and Thailand (INGER & COLWELL 1977, 0.55 ind/100 m²).

One additional factor that may have contributed for the low overall density of leaf-litter frogs in the Reserva Salto Morato may be the altitude of the study area (between 200 and 300 m altitude). Although there are few studies addressing to the effect of altitude on the composition of communities of leaf-litter frogs in the Atlantic Forest, there may be a trend towards a greater density of frogs in high altitudes, where conditions are apparently more favorable, as pointed out by GIARETTA et al. (1997, 1999), in two studies in São Paulo, and by ROCHA et al. (2007) and SIQUEIRA et al. (2009) in the state of Rio de Janeiro. Data available regarding leaf-litter frog abundances in the Atlantic Rainforest biome (see references above) showed that overall frog density in the leaf-litter of forest floor is markedly variable among areas even within a same biome. This variation probably reflect differences among areas in the structural environment, in the availability of resources, in the climatic conditions and in latitude, although we still need a large number of studies on this subject to better understand the trends affecting this variation.

The leaf litter frog biomass (g/ha) in the community also varied among seasons. However, three individuals R. abei, anuran with large body proportions, considerably contributed to autumn estimated mass, resulting, in this season, in biomass values reaching the highest value among the four studied seasons. Excluding the individuals of this toad species, a similar tendency of abundance into all the other species can be observed, suggesting that the biomass in the leaf litter-frog community is also higher during warmer months (spring and summer).

We conclude that the community of leaf-litter frogs in the Reserva Salto Morato varies among seasons, with lower values of abundance, density and richness in cooler seasons. The higher latitude of the area in the present study compared to those where other studies in the tropics regarding leaf-litter frogs were made, may explain in part why values of the community parameters were comparatively lower than those found for leaf-litter frogs in other forests in Brazil and worldwide. We therefore emphasize the importance of extending studies that address seasonal effects on communities of leaf-litter frogs.

Our study is the first providing data on the composition, richness, abundances and densities of the leaf-litter frog community for the Reserva Natural Salto Morato, as well as the first study regarding this subject to the extensive region of southern Brazil, including Paraná. Also, this study is the first providing data regarding seasonal variation in a leaf-litter frog community to southern forests of Brazil. The few studies in Paraná regards amphibian species composition for two areas (ARMSTRONG & CONTE 2010, CUNHA et al. 2010).

ACKONWLEDGMENTS

This study was sponsored by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), which provided research grants to C.F.D. Rocha (Processes 304791/2010-5 and 470265/2010-81. Graduate fellowships were granted to M.S. Pereira from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). Authorization 20703-3 to collect the frogs was granted by Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio).We also thank the Reserva Natural Salto Morato for logistical support during the study, and A.L. Benedeti, A.L. Luza and L.F.W. Bortolon for their support during the inventories and M. Almeida-Gomes, M. Wachlevski and R. C. Laia for kindly reviewing the manuscript.

LITERATURE CITED

Submitted: 17.XI.2010; Accepted: 25.X.2011.

Editorial responsibility: Mauricio O. Moura

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Publication Dates

• Publication in this collection
  17 Jan 2012
• Date of issue
  Dec 2011

History

• Received
  17 Nov 2010
• Accepted
  25 Oct 2011