Seasonal variation in the use of food resources by small fishes inhabiting the littoral zone in a Neotropical floodplain lake

Quirino, Bárbara Angélio; Carniatto, Natália; Gaiotto, Juliana Vallim; Fugi, Rosemara

doi:10.1007/s10452-015-9535-2

Cited by 25 publications

(15 citation statements)

References 45 publications

(69 reference statements)

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“…Sympatric pumpkinseed and the cichlid showed similar niche width and overlapped in the use of animal prey, but there were still some significant variations in the use of Chironomidae, Hemiptera and Ostracoda. Differences in the contributions of major preys might form an important mechanism reducing interspecific competition (Pompei et al, 2014;Quirino et al, 2015;Olson et al, 2016), especially when sympatric species are likely to share spacerestricted habitats (Magalhães, 1993a;Jackson et al, 2012). Indeed, similar patterns have also been perceived in other studies, with for instance sympatric topmouth gudgeon and common carp strongly partitioning prey (Jackson and Britton, 2014).…”

Section: Discussionmentioning

confidence: 53%

Dietary niche divergence between two invasive fish in Mediterranean streams

Gkenas

Magalhães

Orjuela

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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Clarifying the mechanisms associated with the coexistence of invasive species is important to understand the overall impact of multiple invasions on recipient communities. Here we examined whether divergence or convergence in dietary niche occurred when invasive Lepomis gibbosus and Australoheros facetus coexist in Iberian streams. We used stomach content analyses to determine dietary niche composition, width, and overlap in allopatric and sympatric counterparts in the Lower Guadiana throughout the dry-season. The variations in dietary niche between pumpkinseed and the cichlid were consistent with predictions derived from the niche divergence hypothesis. Although there were no changes in the use of plant material from allopatry to sympatry in either species, sympatric pumpkinseed and the cichlid displayed marked shifts in the use of animal prey and a decrease in niche width relative to allopatric counterparts. Moreover, sympatric pumpkinseed and cichlid showed similar niche width but differed significantly in plant and animal prey use. Taken together these results suggest that divergence in dietary niches may play a role in mediating coexistence of multiple invaders in Iberian streams.

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Section: Discussionmentioning

confidence: 53%

Dietary niche divergence between two invasive fish in Mediterranean streams

Gkenas

Magalhães

Orjuela

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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“…In this aspect, we observed that the contribution of allochthonous material, occurred mainly in November (leaves) and February (seeds), coinciding with the period of highest temperatures and fruiting of plants in the region (Vieira, ; Strassburger, ). The input of allochthonous material is recognized as a food source for fish in lotic environments (Novakowski et al ., ; Quirino et al ., ) and the results found here reinforce this idea, even in subtropical environments with few cyclical variations of dry and rainy periods.…”

Section: Discussionmentioning

confidence: 99%

“…Characid species, especially Astyanax, exhibit a high diversity of feeding tactics and exploit several compartments of the habitat, besides foraging in the water column and on the water surface and some are also classified as nectobenthic (Barros et al, 2017, Bonato et al, 2017. Thus, this feeding tactic may favour the consumption of resources that fall into the water from the surrounding environment (Quirino et al, 2015;Silva et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Some authors have used a permutational analysis of multivariate dispersions (PERMDISP; Anderson, 2006) to verify individual intraspecific variability (Quirino et al, 2015(Quirino et al, , 2017 and to assess differences in intra and interspecific niche breadth, between hydrological periods (Correa & Winemiller, 2014;Silva et al, 2017). In our study however, we used the PERMDISP for both situations.…”

Section: Individual Intraspecific Variability and Niche Breadthmentioning

confidence: 99%

“…Dietary segregation has been highlighted as the most important and is considered a key factor for the coexistence of fish species and assemblage structure (Gerking, 1994;Ross, 1986;Schoener, 1974;Winemiller & Pianka, 1990). Hence, knowledge of food resource sharing by species, especially among those with similar morphological traits and close phylogenetic relationships, allow inferences about the processes in the dynamic context of ecosystems (Corrêa et al, 2011;Juncos et al, 2015;Quirino et al, 2015;Silva et al, 2017). In this sense, species may exhibit a greater intraspecific variation and, consequently, a greater trophic breadth, which may lead to increased interspecific competition, or less intraspecific variation, but with the risk of increasing intraspecific competition (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Is resource partitioning the key? The role of intra‐interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers

Neves

Silva

Baumgartner

et al. 2018

Journal of Fish Biology

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This study focused on intra and interspecific variations in the diet of small species in the Pelotas River, upper Uruguay River ecoregion. We tested the hypothesis that five small characids coexist via resource partitioning. Samplings were performed quarterly between August 2013 and May 2014 at 14 sites in the Pelotas River basin, using gillnets of different mesh sizes, seines, cast nets and electrofishing. In this study, the contents of 1,253 stomachs were analysed from Astyanax dissensus, A. paris, A. saguazu, A. xiru and Bryconamericus patriciae. The main food resources consumed were aquatic insects, leaves, seeds and detritus. There were significant seasonal intra and interspecific variations in the use of food resources by the five species. Permutational analysis of multivariate dispersions results indicated significant differences in individual intraspecific variability between the sampled periods, with the highest values found in November and February because of an increase in allochthonous resources (leaves and seeds). Besides this, significant differences in the proportions of consumption of allochthonous and autochthonous were observed. The trophic niche breadth was significantly different among the species, such that in August, the species had narrower niche breadths. In the other periods, the highest niche breadth values were due to an increase in the consumption of allochthonous items. Diet overlap was low (< 0.4) between 62% of the species pairs. The small characid species showed pronounced changes in resource use and intra and interspecific variations indicating resource partitioning. These factors appear to be essential in species interactions and for coexistence.

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Linking anatomical and histological traits of the digestive tract to resource consumption and assimilation of omnivorous tetra fishes

Neves,

Amorim,

Delariva

et al. 2024

Ecology and Evolution

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This study explores the interplay between digestive tract traits, food intake, and assimilation in omnivorous tetra fishes (Psalidodon bifasciatus, P. aff. gymnodontus, and Bryconamericus ikaa) from the Iguaçu River basin, an ecologically significant region known for high endemism. We hypothesize that variations in digestive tracts across species would be associated with differences in diet, isotopic composition in fish tissues, and overall diet assimilation. To test this, we employed stereoscopic and light microscopy to characterize the gross anatomy, histomorphology, and histochemistry of fish digestive tracts. Additionally, we used stomach content and stable isotope analyses to trace fish diets. While these tetra fishes shared histological structures, disparities were noted in anatomical digestive traits and diet preferences. The smallest species, B. ikaa, with a shorter intestine, had fewer pyloric caeca and primarily consumed animal‐based diets. Conversely, P. bifasciatus and P. aff. gymnodontus, with longer intestines, displayed numerous pyloric caeca and consumed a balanced mix of animal and plant items. Despite anatomical and dietary differences, all three species predominantly assimilated animal‐origin food. The tetra fishes had histological variations among digestive tract segments, with the esophagus having the thickest muscular layer, gradually thinning towards the posterior intestine. The final portion of the intestine exhibited a significant expansion in the lumen perimeter, while the esophagus had the smallest lumen area. Goblet cells were most concentrated in the posterior intestine for all species. The gross anatomy of these tetra fishes aligns with their omnivorous habit, while diet assimilation was dominated by animal‐origin food. These findings provide crucial insights into the structural and tissue characteristics of their digestive systems, laying the groundwork for deeper exploration into the physiological aspects of their digestive tracts and enhancing our understanding of their feeding strategies.

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Seasonal variation in the use of food resources by small fishes inhabiting the littoral zone in a Neotropical floodplain lake

Cited by 25 publications

References 45 publications

Dietary niche divergence between two invasive fish in Mediterranean streams

Dietary niche divergence between two invasive fish in Mediterranean streams

Is resource partitioning the key? The role of intra‐interspecific variation in coexistence among five small endemic fish species (Characidae) in subtropical rivers

Linking anatomical and histological traits of the digestive tract to resource consumption and assimilation of omnivorous tetra fishes

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