Trophic Niche Variation and Individual Specialization in<i>Hypsiboas pulchellus</i>(Duméril and Bibron, 1841) (Anura, Hylidae) from Uruguay

Rosa, Inés da; Canavero, Andrés; Maneyro, Raúl; Camargo, Arley

doi:10.2994/057.006.0208

Cited by 25 publications

(19 citation statements)

References 34 publications

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“…Coleoptera-adult prey also showed high importance to Boana leptolineata (Braun and Braun, 1977) in a habitat that is similar to that of this study (Barbosa et al, 2014). A high consumption of Araneae was also recorded for Boana pulchella (Duméril and Bibron, 1841) in coastal areas of Rio Grande do Sul and Uruguay (Da Rosa et al, 2011;Oliveira, 2014). Moreover, the presence of Acarina was also identified in the diet of Boana raniceps (Cope, 1862) in Pantanal (Sabagh et al, 2010) and of B. pulchella in Uruguay (Da Rosa et al, 2011).…”

Section: Discussionmentioning

confidence: 89%

“…A high consumption of Araneae was also recorded for Boana pulchella (Duméril and Bibron, 1841) in coastal areas of Rio Grande do Sul and Uruguay (Da Rosa et al, 2011;Oliveira, 2014). Moreover, the presence of Acarina was also identified in the diet of Boana raniceps (Cope, 1862) in Pantanal (Sabagh et al, 2010) and of B. pulchella in Uruguay (Da Rosa et al, 2011). It is worth reminding that, in terms of biomass, it is believed that this prey category may not be of much importance, as mentioned in other studies on Neotropical hylids (Muñoz-Guerrero et al, 2007;Antoniazzi et al, 2013).…”

Section: Discussionmentioning

confidence: 89%

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Diet of Aplastodiscus perviridis Lutz 1950 (Anura, Hylidae) in subtemperate forests of southern Brazil

Oliveira

Moser

Avila

et al. 2017

Neotropical Biology and Conservation

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 89%

Diet of Aplastodiscus perviridis Lutz 1950 (Anura, Hylidae) in subtemperate forests of southern Brazil

Oliveira

Moser

Avila

et al. 2017

Neotropical Biology and Conservation

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“…In amphibians, ontogenetic, morphological, and seasonal variations in individual trophic specialization have been described only recently and in a small number of species (e.g., Collins et al 1993;Maret and Collins 1997;Maerz et al 2006;Araújo et al 2009;da Rosa et al 2011;Schriever and Williams 2013). However, understanding the contribution of individual trophic specialization may allow for better understanding of population realized trophic niche and its contribution to the ecological food web, especially in those species that connect freshwater and terrestrial ecosystems (i.e., Regester et al 2006) or in populations that play a relevant role in energy storage and turnover in the litter of forest ecosystems (reviewed in Davic and Welsh 2004).…”

Section: Introductionmentioning

confidence: 98%

Trophic specialization at the individual level in a terrestrial generalist salamander

et al. 2015

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Information on individual trophic specialization may be relevant to better understand the ecological adaptation of populations to their environment and the evolution of their realized trophic niche. In this study, we analysed the trophic specialization at the individual level in a population of the plethodontid Northwest Italian Cave Salamander (Speleomantes strinatii (Aellen, 1958)), a terrestrial generalist predator. Salamanders were sampled in northwestern Italy on the forest floor in autumn (n = 49) and spring (n = 47) along with their available prey. In autumn, when trophic resources showed a twofold reduction in abundance, the population trophic niche width (TNW = 2.58) was significantly broader than during spring (TNW = 2.25), and in both seasons, individual specialization (IS) was significantly higher than expected by chance (P = 0.001). There were no sexual or ontogenetic differences in IS within each season, but IS in autumn was significantly higher than in spring (IS = 0.34 and IS = 0.41, respectively; P = 0.01). These findings are in accordance with the niche variation hypothesis, which predicts a positive relationship between TNW and IS. Therefore, while the population became more generalist, individual salamanders shifted towards a more specialized diet by adapting their feeding behaviour to changes in prey availability.Résumé : La connaissance de la spécialisation trophique à niveaux individuelle peut permettre de mieux comprendre l'adaptation des populations à leur milieux et l'évolution de leur niche trophique réalisée. Dans cette étude, nous avons analysé la spécialisation trophique individuelle dans une population de la salamandre terrestre Speleomantes strinatii (Aellen, 1958), qui est un prédateur generaliste. Nous avons échantillonnées les salamandres, au même temps que leur disponibilité en proies, en un milieu forestier de l'Italie du nord-ouest, au cours de l'automne (n = 49) et du printemps (n = 47). En automne, quand la disponibilité en proies est réduite, l'ampleur de niche trophique de la population est majeure (TNW = 2,58) qu'au printemps (TNW = 2,25). Toutefois, dans les deux saisons, la spécialisation individuelle (IS) est significativement majeur de celle attendue par chance (P = 0,001). Il n'y a pas des différences de spécialisation trophique individuelle à niveau du sexe ou d'age entre saison, mais en automne l'IS est majeur qu'au printemps (respectivement IS = 0,34 et IS = 0,41, P = 0,01). Ces résultats sont en accord avec l'hypothèse de la variation de niche, la quelle prédit une relation positive entre TNW et spécialisation à niveau individuel. Dans notre cas, lorsque la population entière devienne plus generaliste, les individus assument une diète plus spécialisée en s'adaptant aux changement des proies disponibles.Mots-clés : Spélerpès de Strinati, écologie trophique, spécialisation individuelle, Speleomantes strinatii, comportement trophique, variation de la niche trophique.

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“…, ; Da Rosa et al . ), corresponding to less than 1% of the group's diversity (Frost ). Hypsiboas leptolineatus (Braun & Braun 1977), Pseudis cardosoi Kwet and Scinax granulatus (Peters 1871) are three anuran species that occur in the subtropical Atlantic Forest of southern Brazil (Kwet et al .…”

Section: Introductionmentioning

confidence: 99%

Interindividual patterns of resource use in three subtropical Atlantic Forest frogs

2017

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Studies with disparate taxa suggest that generalist populations are composed of relatively specialist individuals that use a narrow part of a population's resource pool. Models based on optimum diet theory (ODT) can be used to predict different patterns of variation in resource use among individuals. In this work, we investigated the diet and measured the degree of individual specialization of three anuran species, Hypsiboas leptolineatus, Pseudis cardosoi and Scinax granulatus, from the Atlantic Forest of southern Brazil. The study is based on gut content obtained using a stomach-flushing technique. Additionally, we tested for a correlation between the individuals' diet and morphological variation. Furthermore, we applied methods based on network theory to investigate patterns of resource use among individuals of each species. All three study species showed generalized diets and significant values of individual specialization. However, we did not find any correlation between diet and morphology, indicating that diet variation is not a consequence of morphological trade-offs. The individualresource networks of H. leptolineatus and S. granulatus showed a nested pattern. This result indicates the presence of individuals with more diverse diets than others, and the diets of the more specialist individuals are a predictable subset of the diets of the more generalist ones. The individual-resource network of P. cardosoi did not show a distinct pattern, diverging from what was predicted by optimal diet theory-based models. Although nested or modular patterns are commonly found in individual-resource networks, our results indicate that they are not ubiquitous and that random patterns can also be found.

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Trophic Niche Variation and Individual Specialization inHypsiboas pulchellus(Duméril and Bibron, 1841) (Anura, Hylidae) from Uruguay

Cited by 25 publications

References 34 publications

Diet of Aplastodiscus perviridis Lutz 1950 (Anura, Hylidae) in subtemperate forests of southern Brazil

Diet of Aplastodiscus perviridis Lutz 1950 (Anura, Hylidae) in subtemperate forests of southern Brazil

Trophic specialization at the individual level in a terrestrial generalist salamander

Interindividual patterns of resource use in three subtropical Atlantic Forest frogs

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