Stable isotopes reveal niche segregation between native and non‐native <i>Hoplias</i> in a Neotropical floodplain

Alves, Gustavo Henrique Zaia; Cionek, Vivian de Mello; Manetta, Gislaine Iachstel; Pazianoto, Laryssa H. R.; Benedito, Evanilde

doi:10.1111/eff.12536

Cited by 7 publications

(4 citation statements)

References 50 publications

(74 reference statements)

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“…This is because populations of P. lineatus were still synchronised in pairs of sites where R. vulpinus abundances were negatively correlated (i.e., between sites in the Ivinhema and Paraná rivers). In the case of A. lacustris and Hoplias sp.2, both species inhabit lentic waters and feed mainly on invertivorous fishes (Alves et al, 2020;Luz-Agostinho et al, 2008;Pereira et al, 2017;Piana et al, 2006), probably competing for resources to some degree. Haynes et al (2009) demonstrated that synchrony in basal resources driven by regional stochasticity can propagate through the food web causing predator populations to be synchronised as well.…”

Section: Mechanisms Of Spatial Synchronymentioning

confidence: 99%

Drivers and spatial patterns of population synchrony of fish species in a floodplain

2022

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Spatial synchrony is the correlation between the temporal dynamics of local populations. This pattern may be driven by spatially correlated environmental variation (i.e., Moran effect), dispersal and trophic interactions. Investigating geographic patterns of synchrony can help disentangle the relative importance of these drivers. Using fish abundance data from long‐term ecological research (17 years) in the Upper Paraná River floodplain, we studied the relative roles of dispersal distance, density dependence differences, and environmental synchrony in determining spatial synchrony of the most common species in this floodplain. We also investigated the geography of spatial synchrony by estimating modularity and site‐level contributions to synchrony and anti‐synchrony networks. We found positive spatial synchrony for most species, but levels were relatively low. For most species, our explanatory matrices were poorly related to spatial synchrony. We detected modular structures in some species networks, which reflected complex spatial patterns in synchrony. We also detected sites with high importance to spatial synchrony patterns that could be managed to increase metapopulation stability. The variable levels of spatial synchrony for fish species in the Upper Paraná River floodplain implies the need to monitor several sites to understand their dynamics in this region. Also, some migratory species of high importance to regional fisheries, such as Prochilodus lineatus, may deserve special monitoring attention due to the increased regional extinction risk associated with their high levels of spatial synchrony. Finally, we speculate that hydrological manipulation from upstream reservoirs should consider the timing of water releases to avoid spatially correlated population declines.

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Section: Mechanisms Of Spatial Synchronymentioning

confidence: 99%

Drivers and spatial patterns of population synchrony of fish species in a floodplain

2022

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“…However, empirical findings indicate that not all syntopic, congeneric species can expand their diet breath in periods of greater diversity and abundance of resources (Correa and Winemiller 2014;Silva et al 2017;Neves et al 2018a, b). This may be related to the traits and food preferences of species, and thus be of further assistance to understanding species coexistence (Chesson 2000;Walker et al 2013;Alves et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Seasonal feeding plasticity can facilitate coexistence of dominant omnivores in Neotropical streams

Neves

Kratina

Delariva

et al. 2021

Rev Fish Biol Fisheries

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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. bifasciatus, in the Lower Iguaçu basin. We also tested the impact of seasonality on trophic niche breadth and diet overlap of these two dominant omnivores. Seasonal changes in resource availability strongly influenced the consumption and assimilation of resources by the two fish species. Both species exhibited high levels of omnivory, characterized by high diversity of allochthonous resources in the wet season. Terrestrial invertebrates were the main component of diet during this season. However, in the dry season, both species reduced their isotopic niches, indicating diet specialization. High diet overlap was observed in both seasons, but the isotopic niche overlap was smaller in the dry season. Substantial reduction in the isotopic niche of P. bifascistus and a shift toward aquatic invertebrates can facilitate coexistence during this season of resource shortage. Feeding plasticity allows omnivorous fish to adjust their trophic niches according to seasonality, promoting the exploitation of different resources during periods of greater resource diversity. This seasonal variation could be an important mechanism that contributes to the resource partitioning and coexistence of dominant omnivores in Neotropical streams.

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“…Based on this, the concept of the isotopic niche was proposed, in which the axes of the multidimensional space are isotopic values that record bionomic and scenopoetic ecological information (Newsome et al ., 2007). Several authors have demonstrated that the isotopic niche is an important tool for exploring resource partitioning (Alves et al ., 2020), ontogenetic dietary shifts (Soares et al ., 2021) and niche overlap (Pennock et al ., 2021). This tool is especially useful for predator species, where the isotopic niche can provide a quantitative estimate of the energetic contribution and trophic level of prey species.…”

Section: Introductionmentioning

confidence: 99%

Isotopic niche alteration of a predator fish in a dammed Amazonian black water river

Aguiar‐Santos

deHart

Forsberg³

et al. 2022

Journal of Fish Biology

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Although many upstream effects of a dam on the trophic ecology of fish have been reported, little is known about their downstream effects on the isotopic niche of Amazonian predator fish. The authors used stable isotope analysis of δ 13 C and δ 15 N to determine the downstream effects of damming of the Uatumã River on the niche width, carbon energy sources and trophic position of peacock bass Cichla temensis comparing with a free-flowing river in the Amazon basin, Brazil, during the peak flood and early falling water period of 2020. They found that the C. temensis population of the undammed river had a smaller niche width than the C. temensis population of the dammed river, despite the greater number of prey trophic levels utilized and the higher trophic position of C. temensis individuals. The results demonstrate that in both rivers there is a gradual shift in the contribution of prey fish sources to the diet of C. temensis throughout its growth, even among adult individuals. They conclude that the isotopic niche of C. temensis was altered by damming during the period of late high water to early low water in the Uatumã River.

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Stable isotopes reveal niche segregation between native and non‐native Hoplias in a Neotropical floodplain

Cited by 7 publications

References 50 publications

Drivers and spatial patterns of population synchrony of fish species in a floodplain

Drivers and spatial patterns of population synchrony of fish species in a floodplain

Seasonal feeding plasticity can facilitate coexistence of dominant omnivores in Neotropical streams

Isotopic niche alteration of a predator fish in a dammed Amazonian black water river

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