Estratégias e modos reprodutivos de anuros (Amphibia) em uma poça permanente na Serra de Paranapiacaba, Sudeste do Brasil
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Data
2005-01-01
Autores
Pombal Jr., José P.
Haddad, Celio Fernando Baptista [UNESP]
Título da Revista
ISSN da Revista
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Editor
USP
Resumo
Este estudo descreve o padrão temporal, as estratégias reprodutivas, os modos reprodutivos e a fecundidade de uma taxocenose de anuros em uma poça permanente na Serra de Paranapiacaba, município de Ribeirão Branco, sul do estado de São Paulo (aproximadamente 24º13'S; 48º46'W; ca. 800m do nível do mar). O Trabalho de campo foi conduzido entre janeiro e dezembro de 1993, totalizando 40 noites de observações. Sete visitas preliminares foram feitas antes deste período e sete após. Observações naturalísticas normalmente se iniciavam antes do pôr do sol e eram concluídas aproximadamente entre 24:0001:00h. em três ocasiões as observações foram ao longo da noite. A estratégia reprodutiva mais comum entre os machos de diferentes espécies foi a do macho cantor, mas comportamento satélite foi observado em algumas espécies. O padrão temporal foi prolongado para as espécies desta taxocenose; entretanto, algumas espécies podiam vocalizar ocasionalmente. Seis diferentes modos reprodutivos foram observados na poça ou suas margens. O comprimento rostro-cloacal (CRC) das fêmeas de diferentes espécies foi positivamente correlacionado com o volume da desova, independente do modo reprodutivo. O CRC das fêmeas foi positivamente correlacionado com o número de ovos por desova, embora a correlação seja mais forte para espécies com um modo reprodutivo generalizado. Entretanto, para espécies com modo reprodutivo especializado o número de ovos por desova não foi correlacionado com o CRC das fêmeas. Uma correlação positiva e significativa entre o CRC das fêmeas e o diâmetro dos ovos, também foi detectada para espécies com modo reprodutivo generalizado. Por outro lado, para as espécies com modo reprodutivo especializado o CRC das fêmeas e o diâmetro dos ovos foram negativamente correlacionados. Modos reprodutivos terrestres são possivelmente restritos a espécies pequenas. Ovos grandes podem apresentar problemas com a troca de gases devido ao seu longo desenvolvimento e baixa relação superfície/volume.
Strategies and reproductive modes of anurans (Amphibia) in a permanent pond in Serra de Paranapiacaba, southeastern Brazil. This study describes the temporal patterns, behavioral strategies, reproductive modes, and fecundity of an anuran assemblage in a permanent pond in Serra de Paranapiacaba, municipality of Ribeirão Branco, south of São Paulo State (approximately 24º13'S; 48º46'W; ca. 800m above sea level). Field work was carried out between January and December 1993, totaling 40 nights of observation. Seven preliminary visits were made before this period and seven additional ones after December 1993. Naturalistic observations usually began before sunset and were concluded around 24:0001:00h. on three occasions the observations lasted the entire night. The commonest reproductive strategy among males of different species was that performed by calling male, but the satellite behavior was observed in some species. The calling temporal pattern was prolonged for the species of the assemblage; however, some species called only occasionally. Six different reproductive modes were observed in the pond or on its margins. The SVL of females of different species was positively correlated with egg clutch volume, irrespective of the reproductive mode. The SVL of females was also positively correlated with the number of eggs per clutch, although the correlation is stronger for species with a generalized reproductive mode. However, for species with specialized reproductive mode the number of eggs per clutch was not correlated with the SVL of females. A significant and positive correlation between female SVL and egg diameter was also detected for species with generalized reproductive mode. on the other hand, for species with specialized reproductive mode, female's SVL and egg diameter were negatively correlated. Terrestrial reproductive modes are possibly restricted to small-sized species. Large eggs may face problems of gas exchange due to their longer development period and lower surface/volume ratio.
Strategies and reproductive modes of anurans (Amphibia) in a permanent pond in Serra de Paranapiacaba, southeastern Brazil. This study describes the temporal patterns, behavioral strategies, reproductive modes, and fecundity of an anuran assemblage in a permanent pond in Serra de Paranapiacaba, municipality of Ribeirão Branco, south of São Paulo State (approximately 24º13'S; 48º46'W; ca. 800m above sea level). Field work was carried out between January and December 1993, totaling 40 nights of observation. Seven preliminary visits were made before this period and seven additional ones after December 1993. Naturalistic observations usually began before sunset and were concluded around 24:0001:00h. on three occasions the observations lasted the entire night. The commonest reproductive strategy among males of different species was that performed by calling male, but the satellite behavior was observed in some species. The calling temporal pattern was prolonged for the species of the assemblage; however, some species called only occasionally. Six different reproductive modes were observed in the pond or on its margins. The SVL of females of different species was positively correlated with egg clutch volume, irrespective of the reproductive mode. The SVL of females was also positively correlated with the number of eggs per clutch, although the correlation is stronger for species with a generalized reproductive mode. However, for species with specialized reproductive mode the number of eggs per clutch was not correlated with the SVL of females. A significant and positive correlation between female SVL and egg diameter was also detected for species with generalized reproductive mode. on the other hand, for species with specialized reproductive mode, female's SVL and egg diameter were negatively correlated. Terrestrial reproductive modes are possibly restricted to small-sized species. Large eggs may face problems of gas exchange due to their longer development period and lower surface/volume ratio.
Descrição
Palavras-chave
Floresta Atlântica, modo reprodutivo, fecundidade, estratégias reprodutivas, comportamento reprodutivo, desova, Atlantic Rain Forest, reproductive mode, fecundity, reproductive strategies, breeding behavior, egg clutch
Como citar
Papéis Avulsos de Zoologia (São Paulo). USP, v. 45, n. 15, p. 215-229, 2005.