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Biological indices, energy reserves, steroid hormones and sexual maturity in the infaunal bivalve Scrobicularia plana from three sites differing by their level of contamination.

Abstract：

:The aim of this work was to investigate in situ biometric (condition index, hepato-somatic index, gonado-somatic index), biochemical (glycogen, lipids, sexual steroids) and histological (sex, sexual maturation stage) variables in the infaunal bivalve Scrobicularia plana. First, the reproductive cycle of S. plana was assessed by collecting bivalves from a reference site (the bay of Bourgneuf, Fr) in April, May, July, September and November 2005 and in January and March 2006. Then, S. plana were collected at three key periods of their sexual cycle (March 2006, beginning of gametogenesis; June 2006, spawning; and September 2006, spent) in three sites differing by their level of contamination (bay of Bourgneuf, reference site; Loire and Seine estuaries; Fr, impacted sites). The reproductive cycle of S. plana was well defined with a clear spawning period between May and July, sexual repose from November to January. Development of the gonad began in January and ended in September. Sex-ratio was determined during spawning and the influence of sex on biochemical variables was examined. Progesterone, 17beta-estradiol and testosterone levels in the gonad of S. plana were close to those reported in other bivalves. This study is the first to demonstrate in situ influence of site, sex and sexual maturity on energy reserves, and sexual steroids in S. plana. Even if interpretation of results is complex due to interferences between natural and anthropogenic factors, S. plana is a suitable species for estuarine studies and a better understanding of its reproduction will permit to assess impacts of environmental pollutants.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Mouneyrac C,Linot S,Amiard JC,Amiard-Triquet C,Métais I,Durou C,Minier C,Pellerin J

doi

10.1016/j.ygcen.2008.04.010

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

133-41

issue

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(08)00164-0

journal_volume

157

pub_type

杂志文章

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Biological indices, energy reserves, steroid hormones and sexual maturity in the infaunal bivalve Scrobicularia plana from three sites differing by their level of contamination.