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Lookup NU author(s): Dr Gary Caldwell,
Dr Ceri Lewis,
Emeritus Professor Peter Olive,
Professor Matt Bentley
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Diatoms liberate volatile, biologically active unsaturated aldehydes following cell damage, which negatively impact upon invertebrate reproductive processes such as fertilization, embryogenesis and larval survival. 2,4-Decadienal is frequently identified among the aldehydes produced and is one of the more biologically active. The majority of studies which have examined the toxic effects of diatom aldehydes to invertebrate reproduction have scored egg production and/or hatching success as indicators of biological impacts. There are very few studies which have dealt specifically with the impacts of diatom-derived aldehydes on larval fitness. Larval stages of the polychaetes Arenicola marina and Nereis virens and the echinoderms Asterias rubens and Psammechinus miliaris exposed to 2,4-decadienal at sub 1 mug ml(-1) concentrations suffered reduced survival over the incubation period (day 1 - 8 post fertilization) with detectable differences for the polychates at a concentration of 0.005 and 0.01- 0.1 mug ml(-1) for the echinoderms. Susceptibility of larval N. virens was investigated using stage specific 24 h exposures at 2,4-decadienal concentrations up to 1.5 mug ml(-1). A clear stage specific effect was found, with earlier larval stages most vulnerable. Nectochaete larvae (9 - 10 d) showed no reduction in survival at the concentrations assayed. Fluctuating asymmetry (FA), defined as random deviations from perfect bilateral symmetry, was used to analyse fitness of larval P. miliaris exposed to 2,4-decadienal at concentrations of 0.1, 0.5 and 1 mug ml(-1). The degree and frequency of asymmetrical development increased with increasing 2,4-decadienal concentration. Equally, as FA increased larval survival decreased. These results provide further support for the teratogenic nature of 2,4-decadienal and its negative impact on invertebrate larval fitness. (C) 2004 Elsevier Ltd. All rights reserved.
Author(s): Caldwell GS, Lewis C, Olive PJW, Bentley MG
Publication type: Article
Publication status: Published
Journal: Marine Environmental Research
ISSN (print): 0141-1136
ISSN (electronic): 1879-0291
Publisher: Elsevier Ltd
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