Acta Limnologica Brasiliensia
http://www.alb.periodikos.com.br/article/doi/10.1590/S2179-975X11124
Acta Limnologica Brasiliensia
Artigo Original

Taxonomic structure and spatial distribution of aquatic invertebrates from temporary wetlands after a severe drought event in southern Brazil

Estrutura taxonômica e distribuição espacial de invertebrados aquáticos de zonas úmidas temporárias após evento de seca severa no sul do Brasil

Bárbara Oleinski; Cleber Palma-Silva; Edélti Faria Albertoni

http://dx.doi.org/10.1590/S2179-975X11124 Acta Limnol. Bras. (Online), vol.38, e2, 2026
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Abstract

Aim: The aim of this study was to evaluate the composition and spatial distribution of aquatic invertebrates in temporary wetlands following a severe drought event in southern Brazil.

Methods: Aquatic invertebrates and limnological variables were collected from 14 temporary wetlands located on the campus of the Federal University of Rio Grande, Rio Grande do Sul State, Brazil, after a severe drought period in the summer de 2024.

Results: The temporary wetlands were characterized by small size (70.8 – 336.0 m2), shallow depth (9.0 – 36.0 cm), and water temperature between 20.5 and 29.4 ºC. A total of 3230 invertebrates were identified, encompassing 55 different taxa. The most frequent groups were Diptera (761 individuals), Collembola (526 individuals), and Gastropoda (498 individuals). Additionally, 11 unique taxa were found in temporary wetlands analyzed, with the majority belonging to Arachnida. Based on taxa abundance, two main clusters were observed, the first being composed of temporary wetlands (TW) from 1 to 9, and the second cluster with areas 10 to 14.

Conclusions: Climate change projections suggest a rising frequency and potential for severe drought events. Temporary wetlands, which harbor significant diversity of aquatic invertebrates, are particularly vulnerable due to their characteristics and dependence on hydroperiods. Severe drought events may impact species composition and distribution, highlighting the need for monitoring and protection of these habitats.

Keywords

temporary ponds; invertebrate fauna; aquatic biodiversity; climate changes

Resumo

Objetivo: O objetivo deste estudo foi de avaliar a composição e distribuição espacial de invertebrados aquáticos em zonas úmidas temporárias após um evento de seca severa no sul do Brasil.

Métodos: Invertebrados e variáveis limnológicas foram coletados em 14 zonas úmidas temporárias distribuídas no Campus da Universidade Federal do Rio Grande, Rio Grande do Sul, Brasil, durante um período de seca severa no verão de 2024.

Resultados: As zonas úmidas temporárias eram pequenas (70,8 – 336,0 m2), rasas (9,0 – 36,0 cm) e temperatura da água entre 20,5 e 29,4 ºC. Foram contabilizados ao total 3230 invertebrados, distribuídos em 55 táxons. Diptera (761 indivíduos), Collembola (526 indivíduos) e Gastropoda (498 indivíduos) foram os grupos mais frequentes. Além disso, 11 táxons únicos foram encontrados em áreas úmidas temporárias analisadas, com a maioria pertencente a Arachnida. Com base na abundância de táxons, foram observados dois agrupamentos principais, sendo o primeiro composto por áreas úmidas temporárias (TW) de 1 a 9, e o segundo agrupamento com áreas de 10 a 14.

Conclusões: Projeções de mudanças climáticas indicam um aumento na frequência e na potencialidade de eventos de seca severa. As zonas úmidas temporárias abrigam importante diversidade de invertebrados aquáticos e estes são vulneráveis devido as suas características e relação com os hidroperíodos. Não encontramos registros de monitoramento dessas zonas úmidas. Eventos severos de seca poderão afetar a composição e distribuição de espécies, sendo necessário o monitoramento e proteção desses habitats.

Palavras-chave

poças temporárias; fauna de invertebrados; biodiversidade aquática; mudanças climáticas

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Submetido em:
16/12/2024

Aceito em:
02/12/2025

Publicado em:
05/02/2026

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