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Spatio-Temporal Changes in Basal Food Source Assimilation by Fish Assemblages in a Large Tropical Bay in the SW Atlantic Ocean

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Abstract

Understanding food pathways in estuarine communities is essential to improve our ability to cope with the increasing effects of man-made activities and climate variability on the biodiversity of coastal systems. Herein, we analyzed carbon and nitrogen isotope ratios of food web components in a large tropical bay in the southwestern Atlantic, in order to investigate spatial and temporal changes in the assimilation of basal food sources by fishes. Two hypotheses were evaluated: (i) continental-derived organic matter assimilation and isotopic niches of fish trophic guilds will increase during higher rainfall conditions and (ii) relative mangrove and macroalgae-derived nutrients assimilation will be directly proportional to their relative availability at each location. Our results did not corroborate our first hypothesis, while only partially corroborating the second one. As expected, macroalgae was one of the main assimilated basal food sources (especially by omnivore and zooplanktivore fishes) at the site where this primary producer was highly abundant. In contrast, only negligible amounts of mangrove-derived nutrients were assimilated by most trophic fish guilds at the site harboring an extensive mangrove area. Bayesian mixing models also revealed a substantial contribution of seagrass to herbivore and detritivore fishes. Some mechanisms like water divergence diminishing organic matter transport into the bay and the refractory characteristics of mangrove-derived detritus could partially explain these findings.

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Acknowledgments

EPS thanks CAPES for the doctorate scholarship and the staff of the ichthyology laboratories of UEFS and UFRB and Marlucy Claudino of FURG for their assistance with field and laboratory works.

Funding

Financial support for field sampling, sample processing, and stable isotope analysis is provided by the Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB), PET0030/2012. MVC is supported by the “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior” (CAPES - 88882.31316871/2019-01). Research fellowship is provided by CNPq (310141/2015-0) to AMG.

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Authors and Affiliations

  1. Laboratório de Ictiologia, Departamento de Biologia, Universidade Estadual de Feira de Santana, Feira de Santana, Bahia, 44039-900, Brazil

    Edjane Pereira Santos, Mario Vinicius Condini & Alexandre Clistenes Alcântara Santos

  2. Departamento de Biociências Biológicas, Universidade Federal Rural do Semi-Árido, Av. Presidente Costa e Silva, Mossoró, Rio Grande do Norte, 59625-900, Brazil

    Mario Vinicius Condini

  3. Departamento de Ciências Exatas, Universidade Estadual de Feira de Santana, Km: 03, BR: 116, Campus Universitário, Feira de Santana, Bahia, 44031-460, Brazil

    Heiddy Marquez Alvarez

  4. Instituto Sosígenes Costa de Humanidades, Artes e Ciências, BR 367, Universidade Federal do Sul da Bahia, Porto Seguro, Bahia, Brazil

    Leonardo Evangelista de Moraes

  5. Laboratório de Ictiologia, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, 96201-900, Brazil

    Adna Ferreira Silva Garcia & Alexandre Miranda Garcia

Authors
  1. Edjane Pereira Santos
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  2. Mario Vinicius Condini
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  3. Alexandre Clistenes Alcântara Santos
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  4. Heiddy Marquez Alvarez
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  5. Leonardo Evangelista de Moraes
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  6. Adna Ferreira Silva Garcia
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  7. Alexandre Miranda Garcia
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Corresponding author

Correspondence to Mario Vinicius Condini.

Additional information

Communicated by Henrique Cabral

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Santos, E.P., Condini, M.V., Santos, A.C.A. et al. Spatio-Temporal Changes in Basal Food Source Assimilation by Fish Assemblages in a Large Tropical Bay in the SW Atlantic Ocean. Estuaries and Coasts 43, 894–908 (2020). https://doi.org/10.1007/s12237-020-00716-1

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  • DOI: https://doi.org/10.1007/s12237-020-00716-1

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