Diet of some passerines in south coast of Espírito Santo State, Brazil

Sabino, Ursola; Morais, Rodrigo; Duca, Charles

doi:10.11606/0031-1049.2017.57.29

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…Several studies have indicated that thrushes have fruit-feeding preferences (Nazaro & Blendinger, 2017;Sabino et al, 2017), but even when predominantly frugivorous, invertebrates are also part of the diet (Gasperin & Pizo, 2009). Thus, the classification of both species as FR IN in this study corroborates the range of studies cited above.…”

Section: Discussionsupporting

confidence: 88%

“…C3 fruits in the current study were one of the most important items in the networks, with strong links to all three thrushes. This was the item with the highest contribution in the diet‐based network and one of the most important in the analysis of isotopic‐based networks, emphasizing frugivory in these species, as demonstrated by the diet and isotopic methods, and reported in previous studies (Nazaro & Blendinger, 2017; Sabino et al., 2017). Our results also suggest that thrushes are key species in the trophic networks of restinga forests because they are involved in multiple interactions (Scherer, Maraschin‐Silva, & Baptista, 2007), ingest a large variety of fruits (Scherer et al., 2007, this study), and are common species in these ecosystems (Bispo & Scherer‐Neto, 2010; Harrison, Whitehouse, & Madureira, 2013).…”

Section: Discussionsupporting

confidence: 68%

“…Ruhl, Flaherty, and Dunning (2020) highlights the difficulty of distinguishing isotopic signatures of fruits in bird diets, emphasizing the importance of fruits in the analyses presented here, which highlight the need for well‐supported mixing models. Several studies have indicated that thrushes have fruit‐feeding preferences (Nazaro & Blendinger, 2017; Sabino et al., 2017), but even when predominantly frugivorous, invertebrates are also part of the diet (Gasperin & Pizo, 2009). Thus, the classification of both species as FR IN in this study corroborates the range of studies cited above.…”

Section: Discussionmentioning

confidence: 99%

“…Thrushes stand out for omnivorous and generalist food habits, often feeding on fruits and seeds, as well as small invertebrates (Manhães, Loures‐Ribeiro, & Dias, 2010; Snow & Snow, 1963). Recent studies have shown that thrush diets are composed of a large variety of resources, with an omnivorous habit but with a predominance of fruits (Durães & Marini, 2005; Gomes, Loiselle, & Alves, 2008; Sabino, Morais, & Duca, 2017; Vogel, Zawadzki, & Metri, 2011). Thrushes are able to occupy different environments, such as fragmented and human‐altered patches (D'Avila, Gomes, Canary, & Bugoni, 2010; da Silveira, Niebuhr, Muylaert, Ribeiro, & Pizo, 2016), and are highly vagile, with some migratory species (Nagy, Végvári, & Varga, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Trophic niche similarities of sympatric Turdus thrushes determined by fecal contents, stable isotopes, and bipartite network approaches

Bosenbecker

Bugoni

2020

Ecology and Evolution

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An ecological niche has been defined as an n‐dimensional hypervolume formed by conditions and resources that species need to survive, grow, and reproduce. In practice, such niche dimensions are measurable and describe how species share resources, which has been thought to be a crucial mechanism for coexistence and a major driver of broad biodiversity patterns. Here, we investigate resource partitioning and trophic interactions of three sympatric, phylogenetically related and morphologically similar species of thrushes (Turdus spp.). Based on one year of data collected in southern Brazil, we investigated niche partitioning using three approaches: diet and trophic niche assessed by fecal analysis, diet and niche estimated by stable isotopes in blood and mixing models, and bipartite network analysis derived from direct diet and mixing model outputs. Approaches revealed that the three sympatric thrushes are generalists that feed on similar diets, demonstrating high niche overlap. Fruits from C3 plants were one of the most important food items in their networks, with wide links connecting the three thrush species. Turdus amaurochalinus and T. albicollis had the greatest trophic and isotopic niche overlap, with 90% and 20% overlap, respectively. There was partitioning of key resources between these two species, with a shared preference for fig tree fruits—Ficus cestrifolia (T. amaurochalinus PSIRI% = 11.3 and T. albicollis = 11.5), which was not present in the diet of T. rufiventris. Results added a new approach to the network analysis based on values from the stable isotope mixing models, allowing comparisons between traditional dietary analysis and diet inferred by isotopic mixing models, which reflects food items effectively assimilated in consumer tissues. Both are visualized in bipartite networks and show food‐consumers link strengths. This approach could be useful to other studies using stable isotopes coupled to network analysis, particularly useful in sympatric species with similar niches.

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Section: Discussionsupporting

confidence: 88%