Abstract
Habitat complexity can substantially alter trophic relationships, such as competitive and predatory interactions, between fish species. This study aimed to evaluate how trophic interactions between congeneric fish species (Serrapinnus calliurus, S. heterodon and S. notomelas) are affected by habitat complexity provided by macrophytes. The following predictions were tested: (1) the composition of the diets of congeneric fish species differs between high- and low-complexity habitats and between habitats of the same category; (2) species show higher trophic niche breadth in sites with greater habitat complexity; and (3) trophic niche overlap between congeneric species pairs is low in macrophyte stands because of greater food availability. Sampling was conducted between November 2011 and July 2012 in five floodplain lakes of the Baía River, a tributary of the upper Paraná River. The degree of habitat complexity was categorised as high (with macrophytes) or low (without macrophytes). The stomach contents of the three species sampled from sites of high- or low-complexity habitat were analysed. Diet variation depended on habitat complexity. The median trophic niche breadth of the three congeneric species was low, but their diets showed higher variability in sites of high-complexity habitat. Significant differences in trophic niche overlap were observed in two species pairs when comparing sites of high- and low-complexity habitat. Habitat complexity directly affected trophic interactions between the fish species, which may favour their coexistence through trophic niche segregation. Our study emphasises the importance of habitat complexity in mediating trophic interactions between congeneric species and clarifies the coexistence of ecologically similar fish species.
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Acknowledgments
We sincerely thank José Ricardo Gonçalves, Valdecir Casare, Francisco Alves Teixeira, Valdir Capati, Érica Ikedo, Wladimir Marques Domingues, João Dirço Latini and Sebastião Rodrigues for their help with the sampling. Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia) provided facilities for the research. AAA and LCG are grateful for the Bolsa de Produtividade em Pesquisa granted by CNPq; RMD, RMT and JCBS are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for their fellowships. RMD was a postdoctoral fellow in the Programa Nacional de Pós Doutorado (PNPD/CAPES), Universidade Estadual de Maringá. We are also grateful to Programa de Excelência Acadêmica (PROEX), Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais (PEA) and Universidade Estadual de Maringá (UEM). Finally, we thank Dra Rosemara Fugi and Dra Larissa S. Pereira for critical reading of the text.
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Dias, R.M., Tófoli, R.M., da Silva, J.C.B. et al. Effects of habitat complexity on trophic interactions of three congeneric fish species. Aquat Ecol 56, 877–889 (2022). https://doi.org/10.1007/s10452-022-09954-w
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DOI: https://doi.org/10.1007/s10452-022-09954-w