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Estuarine fish diversity as indicator of natural environmental gradients

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Abstract

The main goal of the research was the assessment of the relationship between estuarine fish species diversity and some abiotic factors as salinity, temperature, and sediment grain size in a tropical coastal lagoon. Fish samples were collected using an experimental trawl net at eight sites in four months during three annual cycles. Multivariate analyses were applied for the identification of spatial and seasonal changes in fish assemblages’ composition along environmental gradients. Extrapolated values of Hill´s numbers were used as diversity measures and compared to same indices calculated without extrapolation on original samples. Strong evidence was found for a high correlation of some fish diversity indices with percentage of mud in sediments and in less degree with bottom salinity. An explanation for this correlation is proposed based on a variable response of main food items of the dominant fish species to abiotic factors (mostly sediment characteristics) and its subsequent effect on the spatial variability of the abundance and composition of fish assemblages, which is reflected in diversity measures. Results obtained in this study can be considered a contribution to the understanding of the relationships between fish assemblages´ diversity and natural abiotic gradients. They provide also a base line for future research on the effects of anthropogenic impacts in the studied lagoon.

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Acknowledgements

Our gratitude to Armando Alvízar Martínez and Daniel Kosonoy Aceves who provided great support during the sampling process, and to the Marine Biology students from the University of Guadalajara who voluntarily participated in the sampling and sample processing activities. We thank Alejandro J. Nene Preciado for his help with the map of the study area and three anonymous reviewers for their comments and suggestions that helped improve an earlier version of this paper.

Funding

This work was partially supported by scholarships from the Consejo Nacional de Ciencia y Tecnología de México (CONACYT) for PhD studies (YCP, No. 588969) and for MSc studies (FNR, No. 748048). Partial support was also provided through several Research Projects funded by the University of Guadalajara (GGS and CMAB, 2016-2019).

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Authors and Affiliations

Authors

Contributions

All authors participated in conceiving and designing research. CMAB, YCP, and FTR conducted sampling. GGS and FNR analyzed data. GGS, CMAB, and FTR wrote the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Consuelo M. Aguilar-Betancourt.

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Conflict of interest

The authors declare no competing interests.

Ethics approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.

Sampling and field studies

All necessary permits for sampling and observation have been obtained by the authors from the competent authorities.

Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Additional information

Communicated by S. E. Lluch-Cota

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González-Sansón, G., Rodríguez, F.N., Aguilar-Betancourt, C.M. et al. Estuarine fish diversity as indicator of natural environmental gradients. Mar. Biodivers. 52, 32 (2022). https://doi.org/10.1007/s12526-022-01270-8

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  • DOI: https://doi.org/10.1007/s12526-022-01270-8

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