Resource partitioning among syntopic Characidae corroborated by gut content and stable isotope analyses

Bonato, Karine Orlandi; Burress, Edward D.; Fialho, Clarice Bernhardt; Armbruster, Jonathan W.

doi:10.1007/s10750-017-3314-0

Cited by 14 publications

(19 citation statements)

References 68 publications

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“…In addition, fish of the family Characidae exhibit many diverse trophic modes (Hyatt, 1979). The genera Astyanax and Bryconamericus (“lambaris”; genera incertae sedis in Characidae) (Lima et al, 2003) form one of the fish clades most abundant in which dietary plasticity has been particularly well documented by previous studies (Bonato, Burress, Fialho, & Armbruster, 2018; Delariva, Hahn, & Kashiwaqui, 2013; Kokubun, Bonato, Burress, & Fialho, 2018; Oricolli & Bennemann, 2006; Pini et al, 2019; Portella, Lobón‐Cerviá, Manna, Bergallo, & Mazzoni, 2017; Silva, Gubiani, Neves, & Delariva, 2017) and has also been associated with the exploitation of alternative and seasonally varying resources in tropical systems (Neves et al, 2018; Silva, Gubiani, & Delariva, 2014).…”

Section: Introductionmentioning

confidence: 99%

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Delariva

Neves

2020

Ecology of Freshwater Fish

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Body shape variation should play a central role in determining the feeding ability of a fish species. We tested whether variations in feeding resource use of sympatric and closely related fish species could be explained by differences in ecologically relevant metrics, such as body morphology, trophic apparatus or combinations thereof. Fish were sampled at 14 sampling sites from Pelotas River and tributaries, Upper Uruguay, Brazil. The stomach contents of five species of Characidae (Astyanax and Bryconamericus) were analysed by the volumetric method. A geometric morphometric approach was used together with internal morphological traits to predict their patterns of prey use. Significant differences in body depth, snout and caudal peduncle lengths were found. Concomitant pronounced variations were verified to occur among species in structures related to digestion and absorption. Increased numbers of cusps, more pyloric caeca and higher intestinal coefficient values were observed in species that consumed greater proportions of plants. The opposite trends occurred in species that consumed greater proportions of insects. Mixed linear models indicated that the characin species differed significantly in the use of algae, aquatic insects, terrestrial insects, plant remains/seeds and detritus. Dietary differences reflected in low trophic niche overlap. Partial least squares regression results indicated strong correlations between morphological divergences and the corresponding variations in species diet. These outcomes combined confirm that the morphological traits that best enables the exploration of certain resource were an important factor in the resource‐related divergence and were the underlying reasons for these species' respective feeding modes.

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Section: Introductionmentioning

confidence: 99%

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Delariva

Neves

2020

Ecology of Freshwater Fish

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“…Many studies report omnivory and high degrees of opportunistic diets for the genera studied here (Bonato et al, 2017;Delariva et al, 2013;Silva et al, 2014). González-Bergonzoni et al (2012) associate the dominance of omnivores with a high abundance of primary producers and with higher temperatures towards the tropics.…”

Section: Discussionmentioning

confidence: 96%

“…Many studies report omnivory and high degrees of opportunistic diets for the genera studied here (Bonato et al ., ; Delariva et al ., ; Silva et al ., ). González‐Bergonzoni et al .…”

Section: Discussionmentioning

confidence: 97%

“…Astyanax dissensus and A. paris were omnivorous, A. xiru was herbivorous, while A. saguazu showed a tendency to aquatic insectivory. 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%

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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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“…Thus, we consider our estimates of prey consumption to be appropriately conservative Cortés 1997;Barwell et al 2015). and have been used successfully in studies of a wide variety of taxa (i.e., Pianka's equation:Driscoll and Miranda 1999;Bulté et al 2008;Crawford et al 2009;Durso et al 2013;Barwell et al 2015;Bonato et al 2018; Morisita-Horn: Bergman and Krebs 1993;Young and Winn 2003;Jaquemet et al 2011;Mablouké et al 2013;Estupiñán- Montaño et al 2018). Although the overlap formula has been traditionally used for assessing similarity in resource use by sympatric species, it is just a similarity index and therefore can also be confidently used for assessing similarities in resource use of distinct species or populations inhabiting different localities.…”

mentioning

confidence: 99%

Do diets vary over large spatial or temporal ranges? A test using interannual and interpopulation data on Diamondback Terrapin (Malaclemys terrapin) diets

et al. 2019

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Animal diets may vary spatially or temporally as resource availability vary. Diets of species with extensive geographic ranges often span multiple habitats, thus their diets may vary accordingly. Temporal diet variation is rarely explored because most diet studies are short term; this is problematic for long-lived species where individuals may persist as prey availability changes. We analyzed diet variation in Diamondback Terrapins (Malaclemys terrapin (Schoepf, 1793)), which inhabits nearly 70 000 km of United States Atlantic coastline, spanning 16.5°N latitude and 27.4°W longitude and four Köppen climatic zones, and Bermuda. We explored spatially or temporally Diamondback Terrapin diet variation, including populations from Atlantic salt marshes, an Everglades mangrove swamp, the Texas Gulf Coast, and a Caribbean golf course pond. We found remarkably high levels of similarity, indicating that although diets vary according to local prey availability, they are broadly similar at lower taxonomic resolution. Even short-term studies may be sufficient to accurately characterize diets of Diamondback Terrapins. These results are surprising given the geographic range sampled in this study and indicate that Diamondback Terrapin diets are conservative, reflecting local prey availability. Such diets apparently allow Diamondback Terrapins to exploit their extensive range and may allow Diamondback terrapin populations to persist as local prey species wax and wane.

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Resource partitioning among syntopic Characidae corroborated by gut content and stable isotope analyses

Cited by 14 publications

References 68 publications

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

Morphological traits correlated with resource partitioning among small characin fish species coexisting in a Neotropical river

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

Do diets vary over large spatial or temporal ranges? A test using interannual and interpopulation data on Diamondback Terrapin (Malaclemys terrapin) diets

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