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Advances in the aquatic sciences
RESEARCH ARTICLE

Congeneric and sympatric tropical mullets respond differently to environmental variability: insights into coexistence

Jordana Rangely A B , Matheus de Barros https://orcid.org/0000-0002-8829-1417 C * , Daniele Souto-Vieira https://orcid.org/0000-0002-2155-5289 A , Maria das Neves Tayana S. C. Oliveira D , Victor E. L. da Silva A , Ivan Oliveira de Assis https://orcid.org/0000-0001-8703-9722 A and Nidia N. Fabré A
+ Author Affiliations
- Author Affiliations

A Laboratório de Ecologia de Peixes e Pesca (LaEPP), Universidade Federal de Alagoas, Maceió, Brazil.

B Instituto Federal de Educação, Ciência e Tecnologia de Alagoas (IFAL), Maceió, Brazil.

C School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA, USA.

D Centro de Estudos do Ambiente e do Mar, Universidade de Aveiro, Aveiro, Portugal.

* Correspondence to: matheus.barrosteu@gmail.com

Handling Editor: Bridie Allan

Marine and Freshwater Research 75, MF23108 https://doi.org/10.1071/MF23108
Submitted: 15 April 2023  Accepted: 18 April 2024  Published: 3 June 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Disentangling mechanisms influencing the seasonal and spatial distribution of fish is essential to understanding population dynamics. In the south-western Atlantic, the sympatric mullets Mugil curema and M. rubrioculus are closely related and use habitat similarly. However, which processes allow their coexistence is unknown.

Aims

We tested the hypothesis that the two species exhibit temporally and spatially decoupled habitat-use patterns to allow sympatry due to different responses to environmental drivers.

Methods

Bayesian zero-inflated count models were used to unravel spatial and temporal distribution patterns of those species in a south-western Atlantic lagoon.

Key results

The two species display different distributions within the estuary, being spatially and temporally segregated, with M. curema mostly inhabiting the inner estuary and M. rubrioculus inhabiting coastal marine habitats.

Conclusions

This decoupling in habitat use might be driven by distinct responses to environmental variability: M. curema is influenced by factors such as temperature and dissolved oxygen, whereas M. rubrioculus is influenced by variations in salinity. We suggest that the studied species evolved divergent responses to environmental variation to allow coexistence.

Implications

This study suggests that environmental factors drive mullet abundance, and that zero-inflated count models incorporating those drivers are therefore useful in predicting their spatial and temporal distribution, as well as in standardising abundance trends for stock assessment efforts.

Keywords: ecology, estuary, fish, fisheries, habitat use, Mugil, salinity, temperature.

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