Feeding ecology of thirteen syntopic species of anurans in a seasonal tropical environment

Toft, Catherine A.

doi:10.1007/bf00346717

Cited by 299 publications

(287 citation statements)

References 43 publications

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“…Seasonal changes in body condition of both uninfected and infected frogs were probably caused by changes in energy acquisition or expenditure. Reduced energy intake could be associated with low availability of rainforest arthropods during dry months [56], which can affect the diets of frogs [57]. The strongly reduced body condition of infected frogs in winter could also be related to greater infection loads caused by faster growth rates of B. dendrobatidis under cooler temperatures [58].…”

Section: Discussionmentioning

confidence: 99%

Condition-dependent reproductive effort in frogs infected by a widespread pathogen

et al. 2015

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To minimize the negative effects of an infection on fitness, hosts can respond adaptively by altering their reproductive effort or by adjusting their timing of reproduction. We studied effects of the pathogenic fungus Batrachochytrium dendrobatidis on the probability of calling in a stream-breeding rainforest frog (Litoria rheocola). In uninfected frogs, calling probability was relatively constant across seasons and body conditions, but in infected frogs, calling probability differed among seasons (lowest in winter, highest in summer) and was strongly and positively related to body condition. Infected frogs in poor condition were up to 40% less likely to call than uninfected frogs, whereas infected frogs in good condition were up to 30% more likely to call than uninfected frogs. Our results suggest that frogs employed a pre-existing, plastic, life-history strategy in response to infection, which may have complex evolutionary implications. If infected males in good condition reproduce at rates equal to or greater than those of uninfected males, selection on factors affecting disease susceptibility may be minimal. However, because reproductive effort in infected males is positively related to body condition, there may be selection on mechanisms that limit the negative effects of infections on hosts.

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Section: Discussionmentioning

confidence: 99%

Condition-dependent reproductive effort in frogs infected by a widespread pathogen

et al. 2015

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“…Another characteristic of frogs is that they are gapelimited (Toft 1980), i.e. the body size and width of the mouth determine their feeding habits (Toft 1980;Houston 1987).…”

Section: Discussionmentioning

confidence: 99%

Adaptive significance of death feigning posture as a specialized inducible defence against gape-limited predators

2006

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Death feigning is fairly common in a number of taxa, but the adaptive significance of this behaviour is still unclear and has seldom been tested. To date, all proposed hypotheses have assumed that prey manage to escape predation by sending a death-mimicking signal, although death-feigning postures are markedly different from those of dead animals. Moreover, the efficacy of this technique may largely depend on the foraging mode of the predator; death feigning seldom works with sit-and-wait predators that make the decision to attack and consume prey within a very brief time. We examined whether death feigning in the pygmy grasshopper Criotettix japonicus Haan was an inducible defence behaviour against the frog Rana nigromaculata, a sit-and-wait, gape-limited predator. The characteristic posture assumed by the grasshopper during death feigning enlarges its functional body size by stretching each of three body parts (pronotum, hind legs and lateral spines) in three different directions, thereby making it difficult for the predator to swallow the prey. Our result is the first consistent explanation for why death-mimicking animals do not always mimic the posture of dead animals.

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“…É importante considerar que este é o padrão de alimentação de· indivíduos adu ltos coletados nos três primeiros meses da estação ch uvosa, estando sujeito, portanto, à mudanças ao longo do ano. Variações na dieta de anfibios têm sido causadas por mudanças sazonais (ToFT 1980;WOOLBRlGHT & STEWART 1987), ontogenéticas (LIMA & MOREIRA 1993), ou até mesmo devido à variações na disponibilidade de presas (GALATTI 1992 …”

Section: Hylafuscovariaunclassified

“…Isto é importante uma vez que existem poucos dados disponíveis na literatura sobre a dieta de comunidades de anuros tropicais. Um importante trabalho foi feito por TOFT (1980), que analisando a alimentação de treze espécies sintópicas na Amazônia Peruana, concluiu que seis eram especialistas em formigas. Segundo, veri ficou-se a existência de alterações sazonais na freqüência de capturas de anuros em uma dada localidade.…”

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Alimentação e variação sazonal na freqüência de capturas de anuros em duas localidades do Brasil central

Moreira

Barreto

1996

Rev. Bras. Zool.

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ABSTRACT. FEEDING AND SAZONA I. VARIATION lN HIE CAPTURE OF ANURANS lN TWO LOCA T1ES FROM CENTRA L BRAZIL. The feeding ecology and the sazonal varialion in capture frequencies of anurans in two localities of Central Brazil was studied. The anuran capture frequencies were analysed counting specimen numbers coJlected in pitfaJl traps during the dry and rainy seasons. Anurans were caughl more frequently during lhe rainy season. The diet of adulls Proceratophrys sp., Eleutherodacty/us sp., Bufo paracnemis Lutz, 1925, and Physalaelllus cllvieri Fitzinger, 1826 were studied lhrough the analysis of individual stomach conlents. Results showed that lhe lype 01' diel varied among lhe species sludied. KEY WORDS . Amphibia, Anura, teeding ecology, Brazil, savanna As informações disponíveis sobre os anuros que ocorrem no Brasil Central se restringem à trabalhos produzidos principalmente nas áreas de fisiologia (SEBBEN 1989; SCI-IWARTZ 1993 ; SEBBEN el a!. 1993) e sistemática (BOKERMANN 1962(BOKERMANN , 1972(BOKERMANN , 1975SAZIMA & BOKERMANN 1978), muito embora o cerrado possua uma anfibiofauna rica e diversificada. Um levantamento preliminar realizado no Distrito Federal relaciona um total de 38 espécies de anfíbios para esta região (BRANDÃO et a!. 1993). Esta região possui, portanto, uma riqueza de espécies razoavelmente maior que outras regiões do cone sul onde predominam ambientes não-florestados. No Chaco Paraguaio e nos Llanos Venezuelanos, por exemplo, a riqueza pode variar entre 22 a 29 e entre 16 a 26 espécies, respectivamente (DUELLMAN 1988).O presente trabalho representa uma das primeiras contribuições ao levantamento de informações básicas sobre os anuros que ocorrem nos cerrados do Brasil Central. Primeiro, foi analisada a dieta das quatro espécies mais freqüentemente capturadas durante o período de estudos para verificar como e quais recursos alimentares estão sendo utilizados por esta comunidade. Isto é importante uma vez que existem poucos dados disponíveis na literatura sobre a dieta de comunidades de anuros tropicais. Um importante trabalho foi feito por TOFT (1980), que analisando a alimentação de treze espécies sintópicas na Amazônia Peruana, concluiu que seis eram especialistas em formigas. Segundo, veri ficou-se a existência de alterações sazonais na freqüência de capturas de anuros em uma dada localidade. Esta região apresenta um período de

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Feeding ecology of thirteen syntopic species of anurans in a seasonal tropical environment

Cited by 299 publications

References 43 publications

Condition-dependent reproductive effort in frogs infected by a widespread pathogen

Condition-dependent reproductive effort in frogs infected by a widespread pathogen

Adaptive significance of death feigning posture as a specialized inducible defence against gape-limited predators

Alimentação e variação sazonal na freqüência de capturas de anuros em duas localidades do Brasil central

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