Library Open Repository

Larval Crassostrea bivalve and Artemia brine shrimp bioassays to assess toxicity and micropredation by the heterotrophic dinoflagellates Cryptoperidiniopsis brodyi and Pfiesteria piscicida from Australian waters

Downloads

Downloads per month over past year

Park, TG and Bolch, CJS and Hallegraeff, GM (2007) Larval Crassostrea bivalve and Artemia brine shrimp bioassays to assess toxicity and micropredation by the heterotrophic dinoflagellates Cryptoperidiniopsis brodyi and Pfiesteria piscicida from Australian waters. Journal of Plankton Research, 29. pp. 791-801. ISSN 0142-7873

[img]
Preview
PDF
4012.pdf | Download (449kB)
Available under University of Tasmania Standard License.

| Preview

Abstract

The capability of the heterotrophic Australian marine dinoflagellates Cryptoperidiniopsis brodyi
and Pfiesteria piscicida to impact on larval Pacific oyster (Crassostrea gigas) and brine shrimp
(Artemia salina) nauplii was investigated. An attractant response of the heterotrophs toward
actively swarming Artemia was not observed and no mortality occurred. In contrast, the dinoflagellates
became active and exhibited attacking behavior toward planktonic oyster larvae (below 1 mm
size) within a few seconds. The oyster larvae survived 2500 cells mL21 for 2 days, but mortality
increased to 82–88% by day 12. Aqueous dinoflagellate cell extracts collected from the bioassay
that induced oyster kills were tested in a further larval bivalve bioassay but no mortality was
observed. Oysters over 2 mm in size survived the physical attack by the heterotrophs and remained
alive during the bioassay period. Changes in zoospore and cyst abundances in the presence of oyster
larvae were also documented. More actively swarming zoospores and 2.5-fold higher cell numbers
were produced in the presence of oysters compared to control cultures. These results indicate that
mortalities of the planktonic larvae can be induced by micro-predatory feeding behavior of
C. brodyi and P. piscicida.

Item Type: Article
Journal or Publication Title: Journal of Plankton Research
Publisher: Oxford University Press
Page Range: pp. 791-801
ISSN: 0142-7873
Identification Number - DOI: 10.1093/plankt/fbm060
Additional Information:

The definitive publisher-authenticated version Oxford Journals - http://plankt.oxfordjournals.org/

Date Deposited: 07 Apr 2008 14:17
Last Modified: 18 Nov 2014 03:34
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page