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Benthic infaunal assemblages adjacent to an ocean outfall in Australian marine waters: Impact assessment and identification of indicator taxa

Authors :
Megan Andrew-Priestley
Katie Newton
Margaret E. Platell
Lisa Le Strange
Harry Houridis
Michael Stat
Richard Man Kit Yu
Craig Evans
Zoe Rogers
Jason Pallot
Jaman Van Den Broek
Geoff R. MacFarlane
Source :
Marine pollution bulletin. 174
Publication Year :
2021

Abstract

An impact assessment of oceanic effluent releases from Belmont wastewater treatment works (WWTW) in Newcastle, Australia, was undertaken. Benthic infaunal assemblages in sandy sediments of ~25 m water depth were examined, at sites adjacent to the release point, and at increasing distances up to 2 km in both a NE and SW direction over five consecutive years (2016-2020). Localised impacts were evident for infaunal assemblages, with sites within 20 m of the outfall ("Impact" site types) exhibiting lower taxa richness and Shannon diversity, higher abundances of polychaetes and/or nematodes, higher polychaete ratios, and shifts in assemblage composition in comparison to sites at greater distances during some years. Taxa with increased localised abundances at the outfall were identified as indicators for monitoring impacts, including deposit-feeding polychaetes (Families Polygordiidae, Paraonidae and Dorvilleidae) and Phylum Nematoda. Future infaunal monitoring could include molecular tools and paired sediment analyses.

Details

ISSN :
18793363
Volume :
174
Database :
OpenAIRE
Journal :
Marine pollution bulletin
Accession number :
edsair.doi.dedup.....16761bdc11ef840dab8253dc7fa4c878