Concentration-dependent effects of toxic and non-toxic isolates of the brown tide alga Aureococcus anophagefferens on growth of juvenile bivalves

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DOIResolve DOI: http://doi.org/10.3354/meps282101
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TypeArticle
Journal titleMarine Ecology Progress Series
Volume282
Pages101114; # of pages: 14
Subjectbrown tide; Aureococcus anophagefferens; mussels; clams; Toxic effects
AbstractSuspension-feeding bivalve mollusks are highly susceptible to the deleterious effects of blooms of the picoplankter Aureococcus anophagefferens (brown tide) in coastal bays of the mid- Atlantic USA. Although short-term exposure to A. anophagefferens is known to cause feeding inhibition of bivalves, longer-term effects on growth and survival are poorly documented. This laboratory study examines the concentration-dependent effects of 2 Long Island, New York, isolates of A. anophagefferens on the juvenile hard clam Mercenaria mercenaria and the mussel Mytilus edulis. Concentrations =400 × 103 cells ml–1 of a toxic A. anophagefferens isolate (CCMP 1708) arrested shell growth and caused significant soft-tissue weight loss and reduced condition in both species, effects comparable to those of starvation, but did not induce mortalities over the 3 wk study period. No histopathology was detected at the cellular level; brown tide caused reduction in digestive epithelium height and overall appearance of absorptive cells similar to that observed under starvation. Optimum concentrations of non-toxic, nutritious algae in a mixed assemblage with A. anophagefferens CCMP 1708 did not mitigate effects of brown tide at 400 × 103 cells ml–1, but at 80 × 103 A. anophagefferens cells ml–1 the mixture resulted in positive growth and progressive acclimation to the diet. In contrast, exposure of hard clams to 400 × 103 and 1 × 106 cells ml–1 of a non-toxic A. anophagefferens strain (CCMP 1784) supported growth rates only 18 and 29% below a volume-equivalent control diet of Isochrysis galbana respectively. We thus conclusively demonstrate that the detrimental effects of brown tide on bivalve growth are mainly attributable to cell toxicity, rather than high cell density, nutritional deficiency or poor retention of small (2 µm) cells. The implications of these results to recruitment success and stock-enhancement efforts of bivalve populations in brown tide-affected estuaries are discussed.
Publication date
Copyright noticeCopyright Interesearch 2004
LanguageEnglish
AffiliationNRC Institute for Marine Biosciences; National Research Council Canada; Aquatic and Crop Resource Development
Peer reviewedYes
NRC number1682
NPARC number3538335
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Record identifiereb0fed6b-0a35-43a9-a3b4-3ef92fe6414c
Record created2009-03-01
Record modified2016-05-09
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