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Influence of maintenance dredging on polychaete community composition in an estuary (Tropical Eastern Pacific)

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Abstract

Marine transportation requires maintenance dredging of navigation channels to allow large ships access to inland ports. These dredging activities have repercussions on the benthic habitat, modifying the bottom topography and inducing habitat degradation. In this study, we analyzed the polychaete community composition before, during, and after a maintenance dredging carried out in the tropical estuary of Buenaventura Bay. Transparency, salinity, and dissolved oxygen exhibited temporal variation (p < 0.05) before, during, and after the maintenance dredging. Significant variation in sediment granulometric composition and OM content (p < 0.05) was observed in E1 and E2. Gravel (%), coarse silt (%), organic matter (%), transparency (cm), and disolved oxygen (mg L−1) were the most influential environmental parameters on the polychaete community composition. Polychaete density varied from 0 to 3050 ind. m−2 in E1 and 25 to 1350 ind. m−2 E2. The families Cossuridae, Maldanidae, Lumbrineridae, and Capitellidae were dominant during dredging. The species diversity index (H′) was slightly higher in E1 compared to E2. The NMDS showed differences in the ordination of the polychaetes community composition in at least one of the three seasons. In this study, the observed temporal variations in the polychaete community composition and the environmental variables were mostly driven by the natural disturbances associated with the river discharges and the dredging activities.

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Acknowledgements

We thank the Universidad Nacional de Colombia, Palmira, for the financial support granted for the realization of this work through the "Convocatoria nacional de proyectos para el fortalecimiento de la investigación, la creación y la innovación 2016-2018" code QUIPU:2010100181.

Funding

This research had financial support from the "Convocatoria nacional de proyectos para el fortalecimiento de la investigación, la creación y la innovación 2016–2018" grant code QUIPU:20101001813.

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Correspondence to J. Reyes-Rojas.

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The authors declare that they have no competing interests or personal relationships that could influence the work in this paper.

Ethical approval

All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted and ethical approval was obtained from the Environmental Studies Institute (Spanish acronym: IDEA) of the Universidad Nacional de Colombia and follow international, national, and institutional guidelines for collection of samples in the field. Ethical approval: This article does not contain any studies with human participants performed by any of the authors.

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Editorial responsibility: Anna Grobelak.

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Reyes-Rojas, J., Panesso-Guevara, M. & Duque, G. Influence of maintenance dredging on polychaete community composition in an estuary (Tropical Eastern Pacific). Int. J. Environ. Sci. Technol. 20, 10621–10632 (2023). https://doi.org/10.1007/s13762-022-04722-7

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  • DOI: https://doi.org/10.1007/s13762-022-04722-7

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