Sperm motility and fertilisation success in an acidified hypoxic environment

Graham, H; Rastrick, SPS; Findlay, HS; Bentley, MG; Widdicombe, S; Clare, AS; Caldwell, GS. 2016 Sperm motility and fertilisation success in an acidified hypoxic environment. ICES Journal of Marine Science, 73 (3). 10.1093/icesjms/fsv171

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Abstract/Summary

The distribution and function of many marine species is largely determined by the effect of abiotic drivers on their reproduction and early development, including those drivers associated with elevated CO2 and global climate change. A number of studies have therefore investigated the effects of elevated pCO2 on a range of reproductive parameters, including sperm motility and fertilisation success. To date, most of these studies have not examined the possible synergistic effects of other abiotic drivers, such as the increased frequency of hypoxic events that are also associated with climate change. The present study is therefore novel in assessing the impact that an hypoxic event could have on reproduction in a future high CO2 ocean. Specifically, this study assesses sperm motility and fertilisation success in the sea urchin Paracentrotus lividus exposed to elevated pCO2 for 6 months. Gametes extracted from these pre-acclimated individuals were subjected to hypoxic conditions simulating an hypoxic event in a future high CO2 ocean. Sperm swimming speed increased under elevated pCO2 and decreased under hypoxic conditions resulting in the elevated pCO2 and hypoxic treatment being approximately equivalent to the control. There was also a combined negative effect of increased pCO2 and hypoxia on the percentage of motile sperm. There was a significant negative effect of elevated pCO2 on fertilisation success, and when combined with a simulated hypoxic event there was an even greater effect. This could affect cohort recruitment and in turn reduce the density of this ecologically and economically important ecosystem engineer therefore potentially effecting biodiversity and ecosystem services.

Item Type: Publication - Article
Additional Keywords: Ocean acidification, fertility, urchins, climate change, hypoxia
Subjects: Biology
Ecology and Environment
Marine Sciences
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Helen Findlay
Date made live: 11 Nov 2015 10:47
Last Modified: 06 Jun 2017 16:14
URI: http://plymsea.ac.uk/id/eprint/6695

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