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Environmental drivers of unprecedented Alexandrium catenella dinoflagellate blooms off eastern Tasmania, 2012–2018

Citation

Condie, SA and Oliver, ECJ and Hallegraeff, GM, Environmental drivers of unprecedented Alexandrium catenella dinoflagellate blooms off eastern Tasmania, 2012-2018, Harmful Algae, 87 Article 101628. ISSN 1568-9883 (2019) [Refereed Article]

Copyright Statement

© 2019 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.hal.2019.101628

Abstract

Blooms of the highly toxic dinoflagellate Alexandrium catenella (previously referred to as tamarense group 1) were first detected off eastern Tasmania in 2012 and have since been responsible for incidences of human paralytic shellfish poisoning and extended closures (up to 25 weeks) of mussel, oyster, scallop, abalone and rock lobster industries (up to 150 mg/kg PST in mussels). Investigation of meteorological and oceanographic influences indicate that the annually recurrent winter-spring blooms (June–Oct) occur within a narrow water temperature window (10–15 °C) under two distinct sets of conditions: (1) following high rainfall and land run-off, under relatively light winds; and (2) following periods of anomalously low air temperatures and associated cooling of shallow coastal waters, again under relatively light winds. The common driver of blooms appears to be the development of stratification in coastal waters, via salinity and/or temperature gradients. We propose a framework for evaluating the risk of Alexandrium with the aim of developing a forecasting capability, and compare these environmental conditions with historic data to understand the recent advent of these blooms.

Item Details

Item Type:Refereed Article
Keywords:Alexandrium catenella, dinoflagellate blooms, harmful algal blooms, stratification, rainfall, forecasting
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Phycology (incl. Marine Grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Oysters
UTAS Author:Oliver, ECJ (Dr Eric Oliver)
UTAS Author:Hallegraeff, GM (Professor Gustaaf Hallegraeff)
ID Code:133284
Year Published:2019
Deposited By:Ecology and Biodiversity
Deposited On:2019-06-20
Last Modified:2019-08-12
Downloads:0

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