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Meiofauna community associated with Diopatra sp. (Onuphidae: Polychaeta) tubes of an estuarine tidal flat on the Brazilian Amazon coast

Published online by Cambridge University Press:  28 January 2026

Thuareag Monteiro Trindade dos Santos*
Affiliation:
Laboratório de Pesquisa em Monitoramento Ambiental Marinho (LAPMAR), Grupo de Estudos de Nematoda Aquáticos (GENAQ), Universidade Federal do Pará (UFPA), Belém, Brazil Laboratório de Invertebrados Aquáticos (LIA), Coordenação de Zoologia, Museu Paraense Emílio Goeldi (MPEG), Belém, Brazil
Daiane Aviz
Affiliation:
Laboratório de Invertebrados Aquáticos (LIA), Coordenação de Zoologia, Museu Paraense Emílio Goeldi (MPEG), Belém, Brazil Laboratório de Oceanografia Biológica (LOB), Instituto de Geociências, Universidade Federal do Pará (UFPA), Belém, Brazil
*
Corresponding author: Thuareag Monteiro Trindade dos Santos; Email: thuareag@gmail.com

Abstract

The annelid genus Diopatra is a well-known example of marine ecosystem engineering, as it creates tubes in coastal sediments all around the world. In the Amazon coast, this annelid is common in intertidal estuarine areas and protected beaches. However, there are no data for the Amazon coast regarding studies on the meiofauna associated with Diopatra sp. tubes. Therefore, the present study characterized, for the first time, the meiofauna community found on a muddy-sandy tidal flat of the Amazon coast in areas with and without the presence of Diopatra sp. tubes. Samples were collected in February 2014 in two different areas: (1) an area in which Diopatra sp. tubes were present, and (2) an area without tubes. A total of 13 major meiofaunal groups were found, with Nematoda as the dominant group. Overall, a significant increase in meiofauna density and richness of the meiofauna was observed in the area with the presence of Diopatra sp. tubes. While no large aggregations of Diopatra sp. tubes were observed in the study region, the presence of even a single tube had significant effects on the environmental conditions available to the meiofauna community. The present findings add knowledge about the presence of the bioconstructor in coastal areas and reinforce the role of tube-building polychaetes as ecosystem engineers.

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Research Article
Copyright
© The Author(s), 2026. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom.

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