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]
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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 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)|
|Deposited By:||Ecology and Biodiversity|
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