2021
DOI: 10.1007/s11160-021-09648-w
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Seasonal feeding plasticity can facilitate coexistence of dominant omnivores in Neotropical streams

Abstract: Coexistence of ecomorphologically similar species in diverse Neotropical ecosystems has been a focus of long-term debate among ecologists and evolutionary biologists. Such coexistence can be promoted by trophic plasticity and seasonal changes in omnivorous feeding. We combined stomach content and stable isotope analyses to determine how seasonal variation in resource availability influences the consumption and assimilation of resources by two syntopic fish species, Psalidodon aff. gymnodontus and P. bifasciatu… Show more

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Cited by 16 publications
(16 citation statements)
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References 98 publications
(126 reference statements)
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“…While niche partitioning between coexisting species at a single site is well documented, relatively fewer studies examined these patterns across multiple natural communities. Furthermore, although ecological theory predicts that competition, in particular intraspecific competition, plays a key role mediating niche partitioning (Chase & Leibold, 2009; Chesson, 2000; MacArthur, 1970), the role of competition is more often implied using proxies such as season, consumer abundance and resource abundance (Costa‐Pereira et al, 2018, 2019; de Camargo et al, 2021; Neves et al, 2021; Sánchez‐Hernández et al, 2021) without evidence for negative impacts of competition on individuals and/or populations.…”
Section: Introductionmentioning
confidence: 99%
“…While niche partitioning between coexisting species at a single site is well documented, relatively fewer studies examined these patterns across multiple natural communities. Furthermore, although ecological theory predicts that competition, in particular intraspecific competition, plays a key role mediating niche partitioning (Chase & Leibold, 2009; Chesson, 2000; MacArthur, 1970), the role of competition is more often implied using proxies such as season, consumer abundance and resource abundance (Costa‐Pereira et al, 2018, 2019; de Camargo et al, 2021; Neves et al, 2021; Sánchez‐Hernández et al, 2021) without evidence for negative impacts of competition on individuals and/or populations.…”
Section: Introductionmentioning
confidence: 99%
“…( 2016 ) and Neves et al. ( 2021 ). Vertical and horizontal error bars indicate mean ± standard deviations of the four investigated basal resources…”
Section: Resultsmentioning
confidence: 96%
“…The isotope signatures (δ 13 C and δ 15 N) are plotted for each primary consumer, that is, herbivores and detritivores, together with the mean isotope signature of the four basal resources from the four investigated islands (N = 5). Isospace plots have been corrected assuming 1 trophic enrichment factors (TEFs) for primary consumers, following the method described in Neres-Lima et al ( 2016) and Neves et al (2021). Vertical and horizontal error bars indicate mean ± standard deviations of the four investigated basal resources models showed a great variability in the relative contribution of allochthonous resources (i.e., seagrass and marine carrion combined) among invertebrate consumer species but an overall consistency within species sampled in the beach and inland habitat, that is, either a high or a low proportion in both habitats (Table 3, Table S2).…”
Section: Proportion Of Allochthonous Resources In the Diet Of Consumer Speciesmentioning
confidence: 99%
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