The dual functions of sea urchin gonads are reflected in the temporal variations of their biochemistry

Hughes, Adam D.; Kelly, Maeve S.; Barnes, David K.A. ORCID: https://orcid.org/0000-0002-9076-7867; Catarino, Ana I.; Black, Kenneth D.. 2006 The dual functions of sea urchin gonads are reflected in the temporal variations of their biochemistry. Marine Biology, 148 (4). 789-798. https://doi.org/10.1007/s00227-005-0124-0

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Abstract/Summary

Fatty acid analyses are emerging as a powerful technique to probe trophic interactions between organisms. In this paper, the application of both this procedure and gonad index (GI) determination on two populations (intertidal and subtidal) of the echinoid Psammechinus miliaris is reported. The investigation spanned the 3-month spawning period of Scottish west coast populations. In both populations a progressive decrease in the GI was found, coupled with an increasing maturity stage (from mature to spent). Sexual maturation and decrease in GI was synchronous between the two populations. In conjunction, there were distinct changes in gonad biochemistry. Differences in the fatty acid composition of the gonad reflected the changes in sexual maturation. Mature males and females had significant differences in the fatty acid composition of their gonads, whereas post-spawned individuals showed no gender differences. Male urchins had higher levels of polyunsaturated fatty acids (PUFAs) compared to females, and there was a dramatic reduction in the fatty acids 22:6(n−3) and 20:5(n−3) with increasing maturity stage. Using multivariate statistical techniques, these changes in the fatty acid composition of the sea urchin gonad were linked to habitat related diet differences combined with gender differences. These changes in the fatty acid signatures clearly reflect the dual function of the gonad as both a nutrient store and a reproductive organ.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1007/s00227-005-0124-0
Programmes:	BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Biodiversity, Functions, Limits and Adaptation from Molecules to Ecosystems
ISSN:	0025-3162
Additional Information. Not used in RCUK Gateway to Research.:	Full text not available from this repository
Additional Keywords:	Echinoids, Reproduction
NORA Subject Terms:	Zoology
Date made live:	10 Sep 2007 12:40 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/953

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