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Community structure of indigenous fishes relative to habitat variation and invasive tilapia in lakes of Quintana Roo, Mexico

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Abstract

Fish communities of tropical lakes are commonly predicted by local environmental variables, including depth, temperature, oxygen concentration, and substrate composition. Increasingly, however, lacustrine fish communities are being impacted by invasive species. In the state of Quintana Roo, on the Caribbean versant of the Yucatan Peninsula in Mexico, inland aquaculture production has resulted in the widespread establishment of African tilapia (Oreochromis sp.). However, there are still limited quantitative data on their abundance relative to indigenous species, or their influence on native fish diversity. Here, we quantified the ichthyofauna of six lakes from this region, alongside physical and chemical environmental variables. Overall, we observed that greater dissolved oxygen concentration and shallower depths were associated with the highest fish biodiversity across lakes. Moreover, spatial comparisons additionally highlighted the importance of substrate heterogeneity and lake area as influential in determining native fish community structure. Notably, in all lakes, tilapia were relatively uncommon, comprising less than 3% of all fish captured, and their presence was not a significant predictor of indigenous fish biodiversity. Based on these results, we suggest that tilapia may have strong limitations on their population size, plausibly due to the presence of predatory native fish species, or scarce suitable ecological resources (food, breeding habitat). Conservation-focussed lake-wide management of native species via protection of core habitat characteristics may be key to promoting environmental resistance against negative effects of tilapia regional expansions.

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Data availability

All data and analysis codes are available at: https://doi.org/10.5281/zenodo.10845972.

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Acknowledgements

We thank S. Mariani and M. Yallop for useful comments.

Funding

The work was funded by a CONACYT (Consejo Nacional de Ciencia y Tecnología) studentship to CAGJ.

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Authors and Affiliations

Authors

Contributions

Carlos Gracida: conceptualization, methodology, formal analysis, investigation, data curation, writing—original draft, writing—review and editing, visualisation, and funding acquisition. Juan Schmitter-Soto: validation and writing—review and editing. Martin Genner: conceptualization, methodology, investigation, formal analysis, writing—review and editing, visualisation, supervision, and funding acquisition.

Corresponding author

Correspondence to Carlos A. Gracida-Juárez.

Ethics declarations

Fieldwork was conducted under permit PPF/DGOPA-053/15 of Conapesca (National Fishing Council, Mexico), authorised by its scientific and ethical committee. Specimens collected have been deposited in the Ichthyological Collection ECO-CH-P, at El Colegio de la Frontera Sur, Unidad Chetumal, Mexico.

Competing interests

The authors declare no competing interests.

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Gracida-Juárez, C.A., Schmitter-Soto, J.J. & Genner, M.J. Community structure of indigenous fishes relative to habitat variation and invasive tilapia in lakes of Quintana Roo, Mexico. Environ Biol Fish 107, 401–414 (2024). https://doi.org/10.1007/s10641-024-01537-y

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  • DOI: https://doi.org/10.1007/s10641-024-01537-y

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