Acta Limnologica Brasiliensia
https://www.actalb.org/article/doi/10.1590/S2179-975X7522
Acta Limnologica Brasiliensia
Original Article

Spatial variation in abiotic conditions and fish diversity in coastal lagoons, Southern Brazil

Variação espacial de condições abióticas e diversidade de peixes em lagoas costeiras, Sul do Brasil

Luiz Guilherme Schultz Artioli; Clarice Benhardt Fialho

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Abstract

Aim: To compare abiotic variables and fish assemblage descriptors (species composition, richness, dominance and diversity) among coastal lagoons of the Tramandaí river system, southern Brazil.

Methods: Water and fish samples were taken monthly from April 2009 to March 2010 in the littoral zone of six coastal lagoons, three located at the north and three at the south of the Tramandai estuary. Thirteen environmental variables were measured. The fish assemblage samples were sampled with gillnets. We used multivariate analyses to investigate spatial variation in abiotic conditions and fish diversity.

Results: The samples at northern lagoons (Itapeva, Quadros and Malvas) were related to greater values of the turbidity and biochemical oxygen demand, while the southern lagoons (Fortaleza, Rondinha and Barros) were related to greater values of hardness, total dissolved solids, transparency, conductivity and salinity. The fish assemblages were similar in species composition. The species richness was higher in the southern lagoons when considering the same number of specimens. In the northern lagoons the assemblages were numerically dominated by Psalidodon aff. fasciatus and Loricariichthys anus and less diverse, while in southern lagoons were more equitable and diverse.

Conclusions: We concluded that the coastal lakes studied differ in the patterns of variation in abiotic parameters and this reflect in the water quality. Fish richness and species composition are similar, a likely result of the common and recent biogeographic origin of these lagoons. Fish assemblages in large and turbid lagoons present more dominance while the fish assemblages in small and clear lagoons are more diverse. These results may be useful for coastal management that prioritizes fish stocks or for proposing models of fish assemblages in subtropical coastal lagoons.

Keywords

Tramandaí river system, gillnets, fishery resources, littoral zone

Resumo

Objetivo: Comparar variáveis ambientais e descritores das assembleias de peixes (composição de espécies, riqueza, dominância e diversidade) entre lagoas costeiras do sistema do rio Tramandaí, sul do Brasil.

Métodos: Amostras de água e de peixes foram coletadas mensalmente de Abril de 2009 a Março de 2010 na zona litoral de seis lagoas, três ao norte e três ao sul do estuário de Tramandaí. Treze variáveis ambientais de qualidade da água foram mensuradas. As capturas de peixes foram realizadas por meio de redes de emalhe. Usamos abordagem multivariada para investigar variações espaciais nas variáveis abióticas e diversidade de peixes.

Resultados: As amostras das lagoas ao norte (Itapeva, Quadros e Malvas) foram relacionadas com maiores valores de turbidez e demanda bioquímica de oxigênio, enquanto as amostras das lagoas ao sul (Fortaleza, Rondinha e Barros) com maiores valores de dureza, sólidos totais dissolvidos, transparência, condutividade elétrica e salinidade. As assembleias de peixes foram similares em composição de espécies entre as lagoas. A riqueza foi superior nas lagoas ao sul quando o mesmo número de exemplares foi considerado. Ao norte, as assembleias mostraram dominância numérica de Psalidodon aff. fasciatus e Loricariichthys anus, e menor diversidade, enquanto ao sul as assembleias foram mais equitativas e diversas.

Conclusões: Concluímos que as lagoas costeiras estudadas diferem no padrão de variação de parâmetros abióticos, refletindo em diferenças na qualidade da água. A composição e riqueza de espécies são similares e refletem a origem biogeográfica comum e recente das lagoas. As assembleias de peixes em lagoas grandes e turvas apresentam maior dominância enquanto as assembleias de peixes em lagoas pequenas e claras são mais diversificadas. Esses resultados podem ser úteis no manejo costeiro que prioriza os estoques pesqueiros ou na proposição de modelos de assembleias de peixes em lagoas costeiras subtropicais.

Palavras-chave

sistema do rio Tramandaí, redes de emalhe, recursos pesqueiros, zona litorânea

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Submitted date:
11/14/2022

Accepted date:
05/22/2024

Publication date:
07/29/2024

66a7d1c4a95395661b3828e3 alb Articles
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Acta Limnol. Bras. (Online)

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