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Advances in the aquatic sciences
RESEARCH ARTICLE

Sediment effects on interstitial faunal distribution in Brazilian sandy beaches: a multi-phylum approach

Thainá Cortez https://orcid.org/0000-0003-2312-5087 A * , Giulia Marangoni A , Sónia Cristina da Silva Andrade A and Maikon Di Domenico B
+ Author Affiliations
- Author Affiliations

A Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.

B Centro de Estudos do Mar, Universidade Federal do Paraná, Paraná, Brazil.

* Correspondence to: thainacortez@usp.br

Handling Editor: Man Ying Jill Chiu

Marine and Freshwater Research 76, MF24192 https://doi.org/10.1071/MF24192
Submitted: 3 September 2024  Accepted: 6 January 2025  Published: 24 January 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

In sandy beaches, the interstitial system, i.e. spaces among sand grains, forms a habitat that supports a diversity of microorganisms, as meiofauna. The interstitial fauna exhibits wide richness and diversity. Sediment-specific impacts on these communities remain understudied from a broader perspective.

Aims

To describe the interstitial fauna by using a multi-phylum approach and to explore the influence of variations in sediment characteristics at both mesoscale (within a beach) and macroscale (among beaches).

Methods

We sampled 10 sandy beaches, performed granulometric analyses, and searched for potential associations between community assemblages and sediment characteristics.

Key results

Eight phyla were identified, exhibiting a patchy distribution pattern at the mesoscale. Coarse-, medium- and fine-sediment assemblages differed significantly. At the macroscale, phylum preference for sediment type (coarse, medium and fine) was observed, where annelids, flatworms and nemerteans were abundant in the coarse sediment, and nematodes in the fine sediment.

Conclusions

Sediment, along with other ecological factors, plays a role in determining the richness of interstitial assemblages. Not only grain size, but also sorting degree and skewness notably influence the abundance of interstitial communities.

Implications

Ecological studies of interstitial fauna from a broader perspective offer a more comprehensive understanding of interstitial communities and provide valuable insights into habitat preferences.

Keywords: annelida, community, diversity, grain size, granulometry, meiofauna, nemertean, sediment.

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