Adaptation and Evolution of Reproductive Mode in Copulating Cottoid Species

Abe, Takuzo; Munehara, Hiroyuki

doi:10.1201/b10257-7

Cited by 12 publications

(22 citation statements)

References 54 publications

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“…Based on the observation that Jordania zonope has parasperm, it is phylogenetically indicated that parasperm are present in the genera corresponding to clades near the base of Cottidae (Fig. 12;Yabe 1985;Abe and Munehara 2009). In Hemitripteridae, another family of Cottoidea, parasperm has been confirmed in Blepsias cirrhosuss (see Hayakawa and Munehara 2004) and Hemitripterus villosus (see .…”

Section: Discussionmentioning

confidence: 99%

“…The phylogenetic tree of Cottidae is shown in Fig. 12, modified after Yabe (1985) by Abe and Munehara (2009). Based on osteological and myological data, the genus Jordania diverged early in the Cottidae linage at the first branching point (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Internal gamete association refers to the association of egg and sperm in the ovary after copulation followed by egg release and subsequent fertilization in the external environment (Munehara et al 1989). The copulatory species in Cottidae are believed to have evolved from non-copulatory species because copulation can increase reproductive success of males by increasing access of sperm to eggs throughout several clutches by means of sperm retention (Abe and Munehara 2009). The occurrence of copulating species does not coincide with phylogenetic relationships obtained from morphological characters (Yabe 1985), suggesting that copulating species evolved polyphyletically in Cottidae (Abe and Munehara 2009).…”

Section: Introductionmentioning

confidence: 99%

“…The copulatory species in Cottidae are believed to have evolved from non-copulatory species because copulation can increase reproductive success of males by increasing access of sperm to eggs throughout several clutches by means of sperm retention (Abe and Munehara 2009). The occurrence of copulating species does not coincide with phylogenetic relationships obtained from morphological characters (Yabe 1985), suggesting that copulating species evolved polyphyletically in Cottidae (Abe and Munehara 2009). Modifications of the male genital system were favored to facilitate copulation, and some studies have investigated testicular structure (Petersen et al 2004(Petersen et al , 2005Abe and Munehara 2007) and sperm morphology (Hann 1930) in Cottidae.…”

Section: Introductionmentioning

confidence: 99%

“…There are two reproductive modes in Cottidae: oviparity without copulation and internal gamete association with copulation (Abe and Munehara 2009). Internal gamete association refers to the association of egg and sperm in the ovary after copulation followed by egg release and subsequent fertilization in the external environment (Munehara et al 1989).…”

Section: Introductionmentioning

confidence: 99%

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Comparative studies of testicular structure and sperm morphology among copulatory and non-copulatory sculpins (Cottidae: Scorpaeniformes: Teleostei)

et al. 2011

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Testicular structure of 9 species and sperm head morphology of 19 species of Cottidae were observed in order to clarify relationships between morphological characteristics of the male reproductive organ and reproductive mode (copulation or non-copulation). Morphological structure of the testis was divided into the following five types based on the sperm transfer and reservoir system: (1) a non-duct type in which the sperm duct is not a distinct exterior structure, but the tube for sperm transport traverses along the testis as an interior structure; (2) an anterior duct type with distinct anterior sperm ducts traversing along the testis; (3) a posterior duct type with distinct anterior sperm ducts traversing along the dorsal hilus of testis and posterior sperm ducts extending to the rear of the testis; (4) an anterior duct posterior vesicle type with distinct anterior sperm ducts traversing along the testis, and the right and left sperm ducts fusing in the rear of testis, forming the seminal vesicle; (5) a non-duct posterior vesicle type in which sperm ducts do not accompany the testis, and the testis and seminal vesicle are connected directly or through posterior sperm ducts. It is thought that in Cottidae the nonduct type of reproductive organ is primitive, and the anterior duct type is common to all non-copulating species. The testes and accompanying seminal vesicle were seen only in copulating species. Sperm head morphology was divided into three types according to the length/width ratio: oval type B2, intermediate type [2 and B3, and slender type [3. The type of sperm head corresponded closely to the reproductive mode; non-copulating species had oval sperm head, and copulating species had intermediate or slender ones. These results suggest that the structure of the testis and the morphology of the sperm head evolved from testes with anterior sperm ducts and oval sperm heads to testes with an associated seminal vesicle and slender sperm heads in association with the evolution from non-copulatory to copulatory reproduction in Cottidae.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%