Connectivity of toxigenic Pseudo-nitzschia species assemblages between the Northeast U.S. continental shelf and an adjacent estuary.

Autor: Roche KM; Graduate School of Oceanography, University of Rhode Island, Narragansett 02882, RI, United States. Electronic address: kmroche@uri.edu., Church IN; Department of Cell and Molecular Biology, University of Rhode Island, Kingston 02881, RI, United States., Sterling AR; Region 1, U.S. Environmental Protection Agency, Boston 02109, MA, United States., Rynearson TA; Graduate School of Oceanography, University of Rhode Island, Narragansett 02882, RI, United States., Bertin MJ; Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston 02881, RI, United States; Department of Chemistry, Case Western Reserve University, Cleveland 44106, OH, United States., Kim AM; Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston 02881, RI, United States., Kirk RD; Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston 02881, RI, United States., Jenkins BD; Graduate School of Oceanography, University of Rhode Island, Narragansett 02882, RI, United States; Department of Cell and Molecular Biology, University of Rhode Island, Kingston 02881, RI, United States. Electronic address: bdjenkins@uri.edu.
Jazyk: angličtina
Zdroj: Harmful algae [Harmful Algae] 2024 Nov; Vol. 139, pp. 102738. Date of Electronic Publication: 2024 Oct 20.
DOI: 10.1016/j.hal.2024.102738
Abstrakt: Pseudo-nitzschia harmful algal blooms have recently caused elevated domoic acid in coastal environments of the Northeast United States. In 2017, the toxigenic species P. australis was observed in Narragansett Bay, Rhode Island, a temperate estuarine ecosystem, for the first time since 2009 when DNA monitoring for Pseudo-nitzschia species began. This highly toxic species likely contributed to toxin-related shellfish harvest closures and is hypothesized to have been introduced by an offshore source. Little is known about offshore Pseudo-nitzschia spp. populations in the Northeast Continental Shelf marine ecosystem or how often toxigenic species enter Narragansett Bay through physical processes. Here, we collected filtered biomass samples from multiple time series sites within Narragansett Bay and along the Northeast U.S. Shelf Long-Term Ecological Research transect in winter and summer to investigate the frequency and seasonality of potential Pseudo-nitzschia spp. inflow from the continental shelf to the estuary. Species were taxonomically identified using DNA sequencing of the ITS1 region and domoic acid concentrations were quantified by liquid chromatography with tandem mass spectrometry and multiple reaction monitoring. During six years of sampling, Pseudo-nitzschia species assemblages were more similar between Narragansett Bay and the Northeast shelf in winter than summer, suggesting greater ecosystem connectivity in winter. These winter assemblages were often accompanied by higher domoic acid. Several Pseudo-nitzschia species co-occurred most often with domoic acid and were likely responsible for toxin production in this region, including P. pungens var. pungens, P. multiseries, P. calliantha, P. plurisecta, P. australis, and P. fraudulenta. Domoic acid was detected during periods of relatively low macronutrient concentrations in both seasons, warmer sea surface temperatures in winter, and colder temperatures in summer within this dataset. This study represents some of the first domoic acid measurements on the offshore Northeast U.S. Continental Shelf, a region that supplies water to other coastal environments and could seed future harmful algal blooms. The elevated domoic acid and frequency of hypothesized inflow of toxigenic Pseudo-nitzschia spp. from the Northeast continental shelf to Narragansett Bay in winter indicate the need to monitor coastal and offshore environments for toxins and harmful algal bloom taxa during colder months.
Competing Interests: Declaration of competing interest The authors declare no competing financial or personal relationships that could have influenced the work presented in this paper.
(Copyright © 2024 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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