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J. Biol."],"abstract":"<jats:p>Abstract Freshwater species are under threat from anthropogenic disturbance from in-stream barriers. Trophic interactions are a major driver of community structure and understanding how species partition resources in relation to barriers can help determine ecological impacts. In this study, we analyzed the diet based on stomach contents of three cichlid species from distinct genera and with divergent morphologies that occur in syntopy (Apistogramma piauiensis, Cichlasoma cf. zarskei, and Saxatilia brasiliensis) from the Mata de Itamacaoca, middle Munim River basin, Maranh\u00e3o, northeastern Brazil, examining prey diversity and richness variations above and below a dam. Apistogramma piauiensis and Saxatilia brasiliensis primarily consumed insects, while Cichlasoma cf. zarskei had a more diverse diet, including insects, substrate, and fish. The dam had no measurable effect on stomach content diversity or richness; however, there were species-specific differences, with the diet of A. piauiensis showing lower prey richness than the other two species and lower dietary diversity than Saxatilia brasiliensis. nMDS and PERMANOVA analyses indicated considerable dietary niche overlap among species, with a weak but significant effect of species on the composition of consumed prey. There was a high dietary overlap between Cichlasoma cf. zarskei and Saxatilia brasiliensis. All species separated in morphospace with Saxatilia brasiliensis exhibiting traits related to predatory foraging. These results indicate niche separation in ecologies among the three focal species, which may be related to differences in morphology. However, given the limited temporal scale and variables assessed, further studies are necessary to comprehensively evaluate the influence of the dam on trophic resources and fish assemblages.<\/jats:p>","DOI":"10.1590\/1519-6984.293810","type":"journal-article","created":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T15:06:45Z","timestamp":1761577605000},"source":"Crossref","is-referenced-by-count":0,"title":["Trophic dynamics and morphometric divergence of coexisting neotropical cichlid species (Teleostei: Cichliformes) in relation to a dam"],"prefix":"10.1590","volume":"85","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4900-1130","authenticated-orcid":false,"given":"E. 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P.","family":"Ottoni","sequence":"additional","affiliation":[{"name":"Universidade Federal do Maranh\u00e3o,  Brazil; Universidade Federal do Maranh\u00e3o,  Brazil; NRF-South African Institute for Aquatic Biodiversity,  South Africa"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"530","published-online":{"date-parts":[[2025]]},"reference":[{"issue":"11","key":"ref1","doi-asserted-by":"crossref","DOI":"10.1371\/journal.pone.0277647","article-title":"Investigating impacts of small dams and dam removal on dissolved oxygen in streams","volume":"17","author":"ABBOTT K.M.","year":"2022","journal-title":"PLoS One"},{"issue":"11","key":"ref2","doi-asserted-by":"crossref","first-page":"2431","DOI":"10.1111\/jeb.12486","article-title":"Adaptive landscape and functional diversity of Neotropical cichlids: Implications for the ecology and evolution of Cichlinae (Cichlidae; Cichliformes)","volume":"27","author":"ARBOUR J.H.","year":"2014","journal-title":"Journal of Evolutionary Biology"},{"issue":"1836","key":"ref3","article-title":"Continental cichlid radiations: functional diversity reveals the role of changing ecological opportunity in the neotropics","volume":"283","author":"ARBOUR J.H.","year":"2016","journal-title":"Proceedings. 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