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Diel changes in fish assemblages of Southwest Atlantic rocky reefs

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Abstract

The alternation of light and darkness drives species’ activities, and identifying diel rhythms is critical for understanding the ecology and representing the biodiversity of a range of communities. This study aimed to investigate diel changes in rocky reef fish assemblage composition and structure and to identify the most underestimated nocturnal species. We performed visual counts of rocky reef fishes along six times of the day (dawn, morning, afternoon, dusk, early night, and night) within three consecutive days. Distinct fish assemblages were observed, with species from multiple trophic levels during the day, while planktivorous and invertebrate feeders dominated the nighttime. Dawn and dusk shared diurnal and nocturnal species with long active periods, with no records of exclusively crepuscular species. Fish richness and abundance increased from dawn to a peak in the morning or afternoon and decreased at dusk with the lowest values during the night. Nocturnal planktivorous and invertivorous species would be severely underestimated using only diurnal samples, suggesting a potential bias to the understanding of the trophic dynamics. We discussed the underlying processes driving short-term dynamics of reef fish assemblages (e.g., predation risk and prey availability) and highlighted the need for a better representation of twilight and night periods in reef fish ecological studies.

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Data availability

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

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Acknowledgements

We thank Taynara Pontes Franco and Rodrigo Cumplido for field assistance.

Funding

This study was partially financed by CNPq–Brazilian National Counsel for Research Development (302.555/08-0).

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Contributions

Conceptualization: Leonardo Mitrano Neves, Tatiana Pires Teixeira-Neves; methodology: Leonardo Mitrano Neves, Tatiana Pires Teixeira-Neves, Francisco Gerson Araújo; formal analysis and investigation: Leonardo Mitrano Neves, Larissa dos Santos Silva Amaral, Tatiana Pires Teixeira-Neves, Alan Silva Alves Bastos, Lécio de Carvalho-Junior, Maria Dávila Rodrigues Maciel, and Francisco Gerson Araújo; writing – original draft preparation: Larissa dos Santos Silva Amaral, Leonardo Mitrano Neves; writing – review and editing: Larissa dos Santos Silva Amaral, Alan Silva Alves Bastos, Lécio de Carvalho-Junior, Maria Dávila Rodrigues Maciel, and Francisco Gerson Araújo; funding acquisition: Francisco Gerson Araújo; resources: Francisco Gerson Araújo; supervision: Leonardo Mitrano Neves.

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Correspondence to Leonardo Mitrano Neves.

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This is an observational study. The Research Ethics Committee has confirmed that no ethical approval is required.

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The authors declare no competing interests.

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dos Santos Silva Amaral, L., Bastos, A.S.A., de Carvalho-Junior, L. et al. Diel changes in fish assemblages of Southwest Atlantic rocky reefs. Environ Biol Fish 106, 627–639 (2023). https://doi.org/10.1007/s10641-023-01400-6

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  • DOI: https://doi.org/10.1007/s10641-023-01400-6

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