Intrapopulation Diet Variation in Four Frogs (Leptodactylidae) of the Brazilian Savannah

Araújo, Márcio S.; Reis, Sérgio Furtado dos; Giaretta, Ariovaldo Antônio; Machado, Glauco; Bolnick, Daniel I.

doi:10.1643/0045-8511(2007)7[855:idviff]2.0.co;2

Cited by 46 publications

(62 citation statements)

References 52 publications

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“…Leptodactylidae frogs are non-selective predators, usually exhibiting a generalist feeding habit, and consuming prey according to their body size and gape (Araújo et al, 2007). Among them species of the present study, L. chaquensis was the largest one and also had a more diversified diet, including large prey like fishes, anurans and Lepidoptera.…”

Section: Discussionmentioning

confidence: 64%

“…While Orthoptera was the major prey type verified for L. elenae captured in the rice fields, populations from the Cerrado (Araújo et al, 2007) and Amazonian Forest (Caldwell and Vitt, 1999) exhibited a diet composed mainly of Coleoptera and Hemiptera. This difference in population diet composition can reflect habitat prey availability, since high orthoperan abundance is associated to less complex habitats, such as open areas (Borror and DeLong, 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Although some species can be considered specialists (Simon and Toft, 1991;Santos et al, 2003;Biavati et al, 2004), anurans are usually reported as exhibiting generalist and opportunistic feeding habits (Schaefer et al, 2006;Almeida-Gomes et al, 2007;Araújo et al, 2007;Mahan and Johnson, 2007) and, as a result of that, studies on feeding habits have reported a high niche overlap among syntopic and sympatric anuran species (Toft, 1981;Rosa et al, 2002;França et al, 2004;Almeida-Gomes et al, 2007). For generalist anurans, aspects such as phylogeny, foraging mode, prey availability and abundance, and morphological constraints for capture and ingestion of a given prey type can be related to resource partitioning among species (Lima, 1998;Lima and Magnusson, 1998;França et al, 2004;Santos et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Diet and resource partitioning among anurans in irrigated rice fields in Pantanal, Brazil

Piatti¹,

Souza²

2011

Braz. J. Biol.

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Artificial ponds or irrigated systems scattered throughout farmlands can offer important habitats for anurans and can be interesting sites for research on species resources use in a changing landscape. This study describes the diet and resource partitioning among anurans inhabiting irrigated rice fields in the Pantanal region. Twenty categories of prey were found in the stomachs of Leptodactylus chaquensis, L. elenae, L. podicipinus and Rhinella bergi, the most frequent being Coleoptera, Hymenoptera, larvae of Hexapoda, Hemiptera, Diptera and Orthoptera. The great differences found in the diet of these species in rice fields compared to other locations, according to available records in the literature, was the increased importance of Hemipitera and Orthoptera and the decrease in importance of Hymenoptera in the diet of leptodactylids. These differences might be attributed to changes in the availability of resources in response to habitat modification. Although diet composition was very similar among species, niche overlap was larger than expected by chance, suggesting that the competition for food resources is not, or has not been, a significant force in determining the structure of this frog community. Two non-exclusive hypotheses could be considered as a justification for this result: 1) the high niche overlap could result from resource availability, which is sufficient to satisfy all species without any strong competition; 2) or the high values of niche overlap could be a selective force driving species to compete, but there has not been enough time to express a significant divergence in the species diet because the study area is characterised as a dynamic habitat influenced by frequent and cyclical changes.Keywords: niche overlap, agroecosystems, Leptodactylidae, Bufonidae, diet. Dieta e partição de recursos entre anuros em campos de rizicultura no Pantanal, Brasil ResumoLagoas artificiais e sistemas irrigados em áreas de produção agrícola podem oferecer habitats importantes a anuros e ser significativos para investigações sobre o uso de recursos pelas espécies em ambientes modificados. Este estudo descreve a dieta e partição de recursos tróficos entre anuros de campos de rizicultura na região do Pantanal. Nos estômagos de Leptodactylus chaquensis, L. elenae, L. podicipinus e Rhinella bergi foram encontradas 20 categorias de presas, sendo Coleoptera, Hymenoptera, larvas de Hexápoda, Hemiptera, Diptera e Orthoptera as mais frequentes. Maiores diferenças encontradas na dieta dessas espécies em campos de arroz comparadas a de outros locais, de acordo com dados da literatura, foram o aumento da importância de Hemipitera e Orthoptera e a diminuição na importância de Hymenopteras na dieta dos leptodactilídeos. Essas diferenças talvez sejam reflexos de mudanças na disponibilidade de recursos de presas, em resposta às modificações ambientais. Apesar de as espécies apresentarem dietas bastante similares, a sobreposição de nicho foi maior que a esperada ao acaso, sugerindo que a competição por recursos aliment...

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diet and resource partitioning among anurans in irrigated rice fields in Pantanal, Brazil

Piatti¹,

Souza²

2011

Braz. J. Biol.

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“…The Anolis data set, in contrast, reflects geographic populations that are more or less generalized (26). The Nucella and frog data sets include among-species as well as temporal and geographic variation in population niche width (25,(29)(30)(31). Of the five case studies evaluated here, three involved populations that may reasonably be expected to have experienced some degree of ecological release.…”

Section: Discussionmentioning

confidence: 99%

Comparative support for the niche variation hypothesis that more generalized populations also are more heterogeneous

Bolnick

Svanbäck

Araújo

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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422

455

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There is extensive evidence that some species of ecological generalists, which use a wide diversity of resources, are in fact heterogeneous collections of relatively specialized individuals. This within-population variation, or ''individual specialization,'' is a key requirement for frequency-dependent interactions that may drive a variety of types of evolutionary diversification and may influence the population dynamics and ecological interactions of species. Consequently, it is important to understand when individual specialization is likely to be strong or weak. The niche variation hypothesis (NVH) suggests that populations tend to become more generalized when they are released from interspecific competition. This niche expansion was proposed to arise via increased variation among individuals rather than increased individual niche breadth. Consequently, we expect ecological generalists to exhibit stronger individual specialization, but this correlation has been repeatedly rejected by empiricists. The drawback with previous empirical tests of the NVH is that they use morphological variation as a proxy for niche variation, ignoring the role of behavior and complex phenotype-function relationships. Here, we used diet data to directly estimate niche variation among individuals. Consistent with the NVH, we show that more generalized populations also exhibit more niche variation. This trend is quite general, appearing in all five case studies examined: three-spine stickleback, Eurasian perch, Anolis lizards, intertidal gastropods, and a community of neotropical frogs. Our results suggest that generalist populations may tend to be more ecologically variable. Whether this translates into greater genetic variation, evolvability, or ecological stability remains to be determined. frequency dependence ͉ individual specialization ͉ niche expansion

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“…In many anuran trophic studies, arthropods are common food items (Araújo et al 2007, Mahan & Johnson 2007, Santana & Juncá 2007. However, the present short communication reports predation on young treefrog Osteocephalus taurinus Steindachner, 1862 by arthropods: two spider species and a praying mantis, in Central Brazil.…”

Section: Introductionmentioning

confidence: 72%

Predation on young treefrog (Osteocephalus taurinus) by arthropods (Insecta, Mantodea and Arachnida, Araneae) in Central Brazil

et al. 2010

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. Predation on young treefrogs (Osteocephalus taurinus) by arthropods (Insecta, Mantodea and Arachnida, Araneae) in Central Brazil. Biota Neotrop. 10(3): http://www.biotaneotropica.org.br/v10n3/en/abstract?shortcommunication+bn04310032010.Abstract: Praying mantis and spider species are common food items in the diet of several anuran species. Nevertheless, in this study we report the predation of young treefrogs Osteocephalus taurinus by two spider species, a Pisauridae and a Trechaleidae (Neoctenus sp.) and by the praying mantis Eumusonia sp. in Mato Grosso, Central Brazil. The great abundance of this treefrog in the region, combined with its small body size during the juvenil stage, favor its predation by generalists predators. Indeed, more studies are needed to quantify the real influence of invertebrate predators on anuran populations.

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Intrapopulation Diet Variation in Four Frogs (Leptodactylidae) of the Brazilian Savannah

Cited by 46 publications

References 52 publications

Diet and resource partitioning among anurans in irrigated rice fields in Pantanal, Brazil

Diet and resource partitioning among anurans in irrigated rice fields in Pantanal, Brazil

Comparative support for the niche variation hypothesis that more generalized populations also are more heterogeneous

Predation on young treefrog (Osteocephalus taurinus) by arthropods (Insecta, Mantodea and Arachnida, Araneae) in Central Brazil

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