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Sperm Accumulated Against Surface: A novel alternative bioassay for environmental monitoring

Journal article
Authors L. J. Falkenberg
Jonathan N. Havenhand
C. A. Styan
Published in Marine Environmental Research
Volume 114
Pages 51-57
ISSN 0141-1136
Publication year 2016
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Pages 51-57
Language en
Links dx.doi.org/10.1016/j.marenvres.2015...
Keywords Bioassay, Bioassessment, Ecotoxicology, Oyster, Polychaete, Sperm movement, Spermatozoa, reproductive end-points, near-future levels, cod gadus-morhua, ocean, acidification, analysis casa, sea-urchin, fertilization kinetics, salinity, motility, marine, Environmental Sciences & Ecology, Marine & Freshwater Biology, Toxicology
Subject categories Environmental Sciences, Toxicology, Marine ecology

Abstract

Forecasting the impacts of changes in water quality on broadcast spawning aquatic organisms is a key aspect of environmental monitoring. Rapid assays of reproductive potential are central to this monitoring, and there is a need to develop a variety of methods to identify responses. Here, we report a proof of-concept study that assesses whether quantification of "Sperm Accumulated Against Surface" (SAAS) of tissue culture well-plates could be a rapid and simple proxy measure of fertilisation success. Our results confirm that motile sperm (but not immotile sperm) actively accumulate at surfaces and that the pattern of accumulation reflects fertilisation success in the model oyster species Crassostrea gigas. Furthermore, we confirm these patterns of SAAS for another marine species, the polychaete Galeolaria caespitosa, as well as for a freshwater species, the fish Gasterosteus aculeatus. For all species considered, SAAS reflected changes in sperm performance caused by experimentally manipulated differences in water quality (here, salinity). These findings indicate that SAAS could be applied easily to a range of species when examining the effects of water quality. Measurement of SAAS could, therefore, form the basis of a rapid and reliable assay for bioassessments of broadcast spawning aquatic organisms. (C) 2015 Elsevier Ltd. All rights reserved.

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