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Sex change scale and pattern of Tegillarca granosa (Bivalvia: Arcidae) in 2011-2012
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/355426
The sex of bivalves is classified into gonochorism and hermaphroditism, and hermaphroditism is further divided into simultaneous, and sequential. Simultaneous hermaphroditism is the simultaneous release of eggs and sperm by one organism during the same season. Sequential hermaphrodites are either male or female for one or several annual cycles (Heller, 1993; Gosling 2004; Collin, 2013). T. granosa is a sequential hermaphroditic bivalve undergoing sex change (Lee et al., 2014). However, definitive conclusion on whether the scale and pattern of sex change of T. granosa is always consistent could not be made. Therefore, the objective of this study was to reconfirm sex change in T. granosa and consider the scale and pattern of sex change compared to the results of Lee et al. (2014). The total number of T. granosa used for sex change identification was 777 with a shell length (SL) between 25.1-35.0 (30.9±2.13) mm. For Tegillarca granosa, the scale of sex change during 2006-2007 was reported to be 15.1% (Lee et al., 2014). In this study, the overall scale of sex change in T. granosa was 37.6% during 2011-2012, which was approximately 2.5 times higher than that reported by Lee et al. (2014). In addition, the difference between the sex change ratio from females to males and that from males to females was 15.3% during the period of 2011-2012, which was similar to the finding of 15.0% during 2006-2007 (Lee et al., 2014). The sex change ratio of female→male : male→female was 1 : 3.42 during 2006-2007 reported by Lee et al. (2014). It was 1 : 1.57 during 2011-2012 in this study.
