Resumo
The food cycle and geographical variation of Dysdercus diet were studied as strategy elements of trophic resources exploitation. The species used were D. fulvoniger, D. maurus, D. mendesi and D. ruficollis. A random sampling method was adopted at two regular sampling areas (Vassouras and Itaguaí, Rio de Janeiro, Brazil). The places sampled only once were selected based on the potential migration of Dydercus. Various transects were determined, with 99 places; these transects involved six morpho-climatic-phytogeographical domains: Atlantic Tropical, Cerrado, Caatinga, Amazonic Equatorial, Pantanal and "Planalto das Araucárias". The food cycle of Dysdercus at Vassouras is based on the exploitation of reproductive structures (flowerand fruit) of some Malvaceae, Boraginaceae, Compositae and Cucurbitaceae. The total diet includes other host plant structures. Fifty-three plant species (16 families) are explored as food by the insect along the 99 places of sampling. The habitats of Dysdercus are characterized by climatic variations, geographical distribution and phenology of host plants, and also by the dispersion of seeds.
Hemiptera; Pyrrhocoridae; Dysdercus; populational dynamic; phenology; host plants
Hemiptera; Pyrrhocoridae; Dysdercus; populational dynamic; phenology; host plants
Dinâmica populacional de quatro espécies de Dysdercus (Hemiptera, Pyrrhocoridae) e a fenologia das plantas hospedeiras
Populational dynamic of four species of Dysdercus (Hemiptera, Pyrrhocoridae) and the phenology of the host plants
J. R. de AlmeidaI; R. de XerezII; A. CaldasIII
IDepartamento de Ecologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68020, 21949-900 Rio de Janeiro, Rio de Janeiro, Brasil
IIInstituto de Biologia, Universidade Federal Rural do Rio de Janeiro, Antiga Rodovia Rio-São Paulo KM 47, 23851-920 Itaguaí, Rio de Janeiro, Brasil
IIIInstituto de Biologia, Universidade Estadual do Rio de Janeiro, Rua Franscisco Xavier, 524 PHLC, sala 500, 20550-013 Rio de Janeiro, Rio de Janeiro, Brasil
ABSTRACT
The food cycle and geographical variation of Dysdercus diet were studied as strategy elements of trophic resources exploitation. The species used were D. fulvoniger, D. maurus, D. mendesi and D. ruficollis. A random sampling method was adopted at two regular sampling areas (Vassouras and Itaguaí, Rio de Janeiro, Brazil). The places sampled only once were selected based on the potential migration of Dydercus. Various transects were determined, with 99 places; these transects involved six morpho-climatic-phytogeographical domains: Atlantic Tropical, Cerrado, Caatinga, Amazonic Equatorial, Pantanal and "Planalto das Araucárias". The food cycle of Dysdercus at Vassouras is based on the exploitation of reproductive structures (flowerand fruit) of some Malvaceae, Boraginaceae, Compositae and Cucurbitaceae. The total diet includes other host plant structures. Fifty-three plant species (16 families) are explored as food by the insect along the 99 places of sampling. The habitats of Dysdercus are characterized by climatic variations, geographical distribution and phenology of host plants, and also by the dispersion of seeds.
Key words: Hemiptera, Pyrrhocoridae, Dysdercus, populational dynamic, phenology, host plants
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Recebido em 05.IV.1991; aceito em 25.XI.1994.
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Datas de Publicação
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Publicação nesta coleção
24 Jul 2009 -
Data do Fascículo
1993
Histórico
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Aceito
25 Nov 1994 -
Recebido
05 Abr 1991
