Modelling the occurrence of postflexion stages of a marine estuarine-dependent fish in temperate South African estuaries

Yanasivan Kisten; Nadine A. Strydom; Renzo Perissinotto; Sourav Paul

doi:10.3989/scimar.04521.05A

Autores/as

Yanasivan Kisten DST/NRF Research Chair in Shallow Water Ecosystems, Nelson Mandela Metropolitan University - Department of Zoology, Nelson Mandela Metropolitan University https://orcid.org/0000-0001-5468-0230
Nadine A. Strydom Department of Zoology, Nelson Mandela Metropolitan University https://orcid.org/0000-0003-4292-8678
Renzo Perissinotto DST/NRF Research Chair in Shallow Water Ecosystems, Nelson Mandela Metropolitan University https://orcid.org/0000-0002-9224-3573
Sourav Paul DST/NRF Research Chair in Shallow Water Ecosystems, Nelson Mandela Metropolitan University https://orcid.org/0000-0003-4657-9655

DOI:

https://doi.org/10.3989/scimar.04521.05A

Palabras clave:

biogeografía, larvas de peces, reclutamiento, Rhabdosargus holubi, salinidad, turbidez

Resumen

En las especies de peces dependientes de los estuarios marinos como zonas de cría, el movimiento de las larvas en estadio de postflexión hacia el interior de los estuarios es un proceso crítico para su supervivencia. Sin embargo, son raros los estudios detallados que analicen la variabilidad ambiental experimentada por estas larvas en diversos ambientes estuáricos. Este estudio evaluó las condiciones in situ (temperatura, salinidad y claridad del agua) bajo las que Rhabdosargus holubi (Sparidae), pez endémico de África meridional, recluta en los estuarios. Las larvas en postflexión se muestrearon estacionalmente en tres regiones biogeográficas, independientes entre sí, (templada-fría, templada-cálida y subtropical), que incluían tres tipos de estuarios (POE: estuarios permanentemente abiertos, TOC: estuarios temporalmente abiertos/cerrados y ELS: sistemas de lagos estuarinos). Las larvas de Rhabdosargus holubi fueron más abundantes durante la primavera y el verano, en POEs de la región templada-cálida. Los modelos predijeron que la mayor aparición de larvas en los estuarios es función de una menor salinidad (por ejemplo, zonas mesohalinas de 5-17.9 salinidad) y una menor claridad del agua (por ejemplo con coeficiente de extinción de luz de 0-0.2 K_d), particularmente para POEs templado-cálidos. Esto reafirma la importancia del agua dulce para el funcionamiento óptimo como zona de cría, que puede verse comprometida por los embalses, la extracción de agua y el cambio climático en países con escasez de agua como Sudáfrica.

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