Intra and not interspecific competition drives intra-populational variation in resource use by a neotropical fish species

Mendes, Angélica; Fernandes, Izaías Médice; Penha, Jerry; Mateus, Lúcia Aparecida de Fátima

doi:10.1007/s10641-019-00892-5

Cited by 7 publications

(13 citation statements)

References 39 publications

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“…However, contrary to our expectations, individual specialisation was higher in macrophyte stands with low macrophyte biomass, where Mendes, Fernandes, Penha, & Mateus, 2019). This situation leads to an increase in intraspecific competition and can deplete the usual resources of a population (Bolnick et al, 2010).…”

Section: Discussioncontrasting

confidence: 88%

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Habitat complexity and individual variation in diet and morphology of a fish species associated with macrophytes

Cardozo

Quirino

Yofukuji

et al. 2020

Ecology of Freshwater Fish

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Section: Discussioncontrasting

confidence: 88%

“…Individual specialisation has many drivers, such as the seasonal variation of resources, intraspecific competition and habitat accessibility (Araújo et al, 2011;Marklund et al, 2018;Mendes et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Habitat complexity and individual variation in diet and morphology of a fish species associated with macrophytes

Cardozo

Quirino

Yofukuji

et al. 2020

Ecology of Freshwater Fish

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show abstract

“…(2012) and Mendes et al. (2019), which suggested that increased intra‐specific competition (i.e. population density) promotes individual specialisation in perch ( Perca fluviatilis L.), sea otters ( Enhydra lutris [Linnaeus, 1758]), and Neotropical fish species ( Hoplerythrinus unitaeniatus [Spix & Agassiz, 1829]), respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies support the view that resource competition promotes niche variation among individuals within a population, including an important role of intra-specific competition for individual specialisation (Araújo et al, 2011;Costa-Pereira, Araújo, Souza, & Ingram, 2019;Mendes, Fernandes, Penha, & Mateus, 2019;Svanbäck & Bolnick, 2007;Tinker et al, 2012). There is also empirical support that fish species can display a generalist foraging behaviour independent of density-dependent intra-specific competition (Sánchez-Hernández & Cobo, 2013).…”

Section: Introductionmentioning

confidence: 87%

Beyond ecological opportunity: Prey diversity rather than abundance shapes predator niche variation

et al. 2020

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1. Ecological opportunity (i.e. the diversity of available resources) has a pivotal role in shaping niche variation and trophic specialisation of animals. However, ecological opportunity can be described with regard to both diversity and abundance of resources. The degree to which these two components contribute to niche variation remains unexplored. 2. To address this, we used an extensive dataset on fish diet and benthic invertebrate diversity and density from 73 sampling events in three Norwegian rivers in order to explore realised trophic niches and the response of dietary niche variation along gradients of resource diversity (potential trophic niches), resource density (as a proxy of resource abundance) and fish density (as a proxy of inter-and intraspecific competition) in a freshwater top predator (the brown trout, Salmo trutta L.). 3. Linear models indicated that individual and population niche variation increased with increasing ecological opportunity in terms of prey diversity. However, no simple cause-and-effect associations between niche indices and prey abundance were found. Our multiple regression analyses indicated that the abundance of certain resources (e.g. Chironomidae) can interact with prey diversity to determine individual and population realised trophic niches. Niche variation (within-individual component and inter-individual diet variation) decreased with increasing interand intra-specific competition. 4. This study extends prevailing trophic ecology theory by identifying diversity, rather than density, of available prey resources as a primary driver of niche variation in fish of temperate riverine systems with no extensive resource limitation. The study also shows that ecological opportunity may mask the direction of the effect (compression or expansion) of competition on niche variation when food resources are diverse. 5. Our study provides novel empirical insight to the driving forces behind niche variation and reveals that diversity, rather than density, of available prey resources may be a primary driver of niche variation in freshwater fish. Our study supports | 45 SÁNCHEZ-HERNÁNDEZ Et al.

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“…During ontogenetic development, the individual's morphological and physiological changes directly influence the physical restrictions of prey size, foraging skills, energy demand and metabolic costs (Hjelm et al, 2000;Svanbäck & Eklov, 2002). Therefore, it is common to find differences in dietary composition between juvenile and adult fish (Kolasinski et al, 2009;Mendes et al, 2019;Zhao et al, 2014;Zimmerman et al, 2009).…”

mentioning

confidence: 99%

Resource use by omnivorous fish: Effects of biotic and abiotic factors on key ecological aspects of individuals

Fernando

Súarez

2020

Ecology of Freshwater Fish

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Intraspecific variations in the use of resources result from the influence of factors related to individuals and the environment in which they live. Knowing which factors and how they influence the choice of a given resource allows us to understand the different ecological roles of individuals in a population (Singer & Bernays, 2003). This adaptive strategy maximises energy production and optimises the growth and reproductive success of individuals (Araújo et al., 2011;

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Intra and not interspecific competition drives intra-populational variation in resource use by a neotropical fish species

Cited by 7 publications

References 39 publications

Habitat complexity and individual variation in diet and morphology of a fish species associated with macrophytes

Habitat complexity and individual variation in diet and morphology of a fish species associated with macrophytes

Beyond ecological opportunity: Prey diversity rather than abundance shapes predator niche variation

Resource use by omnivorous fish: Effects of biotic and abiotic factors on key ecological aspects of individuals

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