Modelling bloom formation of the toxic dinoflagellates Dinophysis acuminata and Dinophysis caudata in a highly modified estuary, south eastern Australia

Dinoflagellates belonging to the toxigenic genus Dinophysis are increasing in abundance in the Hawkesbury River, south-eastern Australia. This study investigates a twelve year time series of abundance and physico-chemical data to model these blooms. Four species were reported over the sampling campa...

Full description

Saved in:
Bibliographic Details
Published in:Estuarine, coastal and shelf science coastal and shelf science, 2016-12, Vol.183, p.95-106
Main Authors: Ajani, Penelope, Larsson, Michaela E., Rubio, Ana, Bush, Stephen, Brett, Steve, Farrell, Hazel
Format: Article
Language:English
Subjects:
Brackish
Caudata
Dinophysis acuminata
Dinophysis caudata
Dinophysis fortii
Harmful algal blooms
Mesodinium rubrum
Okadaic acid
Phytoplankton
Toxins
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Dinoflagellates belonging to the toxigenic genus Dinophysis are increasing in abundance in the Hawkesbury River, south-eastern Australia. This study investigates a twelve year time series of abundance and physico-chemical data to model these blooms. Four species were reported over the sampling campaign - Dinophysis acuminata, Dinophysis caudata, Dinophysis fortii and Dinophysis tripos-with D. acuminata and D. caudata being most abundant. Highest abundance of D. acuminata occurred in the austral spring (max. abundance 4500 cells l−1), whilst highest D. caudata occurred in the summer to autumn (max. 12,000 cells l−1). Generalised additive models revealed abundance of D. acuminata was significantly linked to season, thermal stratification and nutrients, whilst D. caudata was associated with nutrients, salinity and dissolved oxygen. The models’ predictive capability was up to 60% for D. acuminata and 53% for D. caudata. Altering sampling strategies during blooms accompanied with in situ high resolution monitoring will further improve Dinophysis bloom prediction capability. [Display omitted]
ISSN:0272-7714
1096-0015
DOI:10.1016/j.ecss.2016.10.020