Unnoticed sex change in Atrina maura (Bivalvia: Pinnidae): Histological and size structure evidence

Marian A. Camacho-Mondragón, Bertha P. Ceballos-Vázquez, Alma R. Rivera-Camacho, Marcial Arellano-Martínez

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Sex-change (protandry or protogyny) has gone unnoticed in many bivalves due to the rapid occurrence of this process. In this paper, histological evidence and analyses of the size structure of three geographically separated populations on the northwestern coast of México together with theoretical considerations strongly suggest that Atrina maura (Sowerby I, 1835) is a protandric species. The gonads of a total of 931 A. maura specimens collected in the three study sites were analyzed: Ojo de Liebre lagoon (27°55′N, 114°20′W from March 2002 through February 2003), Ensenada de La Paz (24°11′N, 110°26′W, from May 2004 through June 2005 and during 2007), and Bahía Magdalena (24°30′N, 111°48′W, from March through October 2008). Microscopic analysis of gonads of hermaphrodite specimens enabled the reconstruction of a detailed histological sequence during the male-to-female transition. Analysis of the sex ratio by size class revealed that males occur primarily in the smaller classes, females in the larger classes and hermaphrodites in intermediate size classes. All the evidence substantiate the hypothesis that this species is not gonochoric.
Original languageAmerican English
Pages (from-to)43-51
Number of pages9
JournalAmerican Malacological Bulletin
DOIs
StatePublished - 1 Feb 2015
Externally publishedYes

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Atrina maura
Pinnidae
hermaphrodite
sex reversal
size structure
gonads
Bivalvia
protogyny
protandry
sex ratio
bivalve
lagoon
coasts
coast
analysis

Cite this

Camacho-Mondragón, Marian A. ; Ceballos-Vázquez, Bertha P. ; Rivera-Camacho, Alma R. ; Arellano-Martínez, Marcial. / Unnoticed sex change in Atrina maura (Bivalvia: Pinnidae): Histological and size structure evidence. In: American Malacological Bulletin. 2015 ; pp. 43-51.
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Unnoticed sex change in Atrina maura (Bivalvia: Pinnidae): Histological and size structure evidence. / Camacho-Mondragón, Marian A.; Ceballos-Vázquez, Bertha P.; Rivera-Camacho, Alma R.; Arellano-Martínez, Marcial.

In: American Malacological Bulletin, 01.02.2015, p. 43-51.

Research output: Contribution to journalArticle

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