4.4 Article

Effects of biological and environmental factors on the variability of Paralonchurus brasiliensis (Sciaenidae) density: An GAMLSS application

期刊

JOURNAL OF SEA RESEARCH
卷 183, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.seares.2022.102203

关键词

Demersal fish; Population dynamics; Habitat condition; Atlantic Ocean

资金

  1. Sao Paulo Research Foundation (FAPESP)
  2. Coordination for the Improvement of Higher Education Personnel (CAPES) [7546/13-0]

向作者/读者索取更多资源

This study explores the complex interactions between biological and environmental factors on fish population dynamics using Paralonchurus brasiliensis as a model species. The results highlight the importance of fish biomass, hepatosomatic index, and condition factor as biological factors, and temperature and organic matter as abiotic factors. The study emphasizes the need for robust and flexible statistical methods to model fish population dynamics and the inclusion of biological and environmental factors in fishery resource management.
The hypothesis of this study was based on the premise that complex interactions between biological and environmental factors may explain variability in fish population dynamics. To test this, Paralonchurus brasiliensis (Sciaenidae), a keystone species associated with coastal waters, was used as a model fish species. Generalized Additive Models for Location, Scale and Shape were performed to evaluate relationships among biological and environmental variables. Fish biomass, repletion index (RI), hepatosomatic index (HSI), condition factor (K) and sex ratio was in models as biological factors whereas water temperature, salinity, organic matter, grain size and depth were included as environmental variables. The results revealed significant effects of biological and abiotic factors on population density of P. brasiliensis. The selected model explained 94% of the variability in the explanatory variables. Fish biomass, HSI and K were the most important biological factors, whereas temperature and organic matter were the most important abiotic factors. Variability in fish density suggests that HSI and K both could be used as an additional ecosystem indicator of environmental status (food availability) and fish population health. We also highlight the importance of using robust and flexible statistical methods to model fish population dynamics and the need to incorporate biological and environmental factors into fishery resource management.

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