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

Koya, Yasunori; Hayakawa, Yumiko; Маркевич, А. И.; Munehara, Hiroyuki

doi:10.1007/s10228-010-0196-9

Cited by 9 publications

(23 citation statements)

References 28 publications

(44 reference statements)

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“…Marine sculpins have unique fertilization modes: externally fertilizing species and internal gametic association (IGA) species, with motile sperms in the ovarian fluid interacting with the micropyle, but fertilization occurs only after the release of eggs into seawater (Munehara, Takano & Koya, 1989, 1991. Petersen et al (2005) and Koya et al (2011) have reported that the sperm heads of IGA species are longer than those with external fertilization. Furthermore, sperm motility duration is shorter in freshwater externally fertilizing species than in internally fertilizing species (Gwo, Jamieson & Leung, 2009).…”

Section: Introductionmentioning

confidence: 99%

Fertilization modes drive the evolution of sperm traits in Baikal sculpins

et al. 2021

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Baikal sculpins are a unique group of fishes, including both externally and internally fertilizing species. Sperm traits, such as morphology and motility, are predicted to undergo adaptive changes due to species fertilization modes. However, studies exploring such traits in Baikal sculpins are lacking. Here, we conducted a field study and investigated sperm traits of three sculpins with external fertilization (Cottocomephorus grewingkii, Leocottus kesslerii and Paracottus knerii) and one sculpin with internal fertilization (Comephorus dybowskii). Sperm head morphology was spherical in both types of fertilizing species; however, the head cross-sectional area of the sperm of the internal fertilizer was smaller than that of external fertilizers. This result implies that sperm head morphology might be adapted to swim in a viscous ovarian fluid. The internal fertilizer, C. dybowskii, had longer and fasterswimming sperms with longer motility duration than the external fertilizers, perhaps due to different sperm competition levels. Sperms of the internal fertilizer were only motile in isotonic solutions, whereas sperms of the external fertilizers were motile in lake waters, suggesting that sperm motilities are specialized according to their external/internal environments. To our knowledge, this is the first study to demonstrate sperm traits of Baikal sculpins, which may have evolved adaptively along with changing fertilization modes.

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Section: Introductionmentioning

confidence: 99%

Fertilization modes drive the evolution of sperm traits in Baikal sculpins

et al. 2021

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“…In accordance with our second prediction, only ostracophilous sculpins had elongated ovipositors, while non-ostracophilous sculpins lacked this feature. Since non-ostracophilous sculpins have been suggested to be the ancestral state (Yabe 1985;Koya et al 2011;Munehara et al 2011; Knope 2013), we can conclude that the elongated ovipositor has evolved as an adaptation to the ostracophilous reproduction strategy. The ovipositor in species using solitary tunicates as hosts was much longer than that in species using colonial tunicates and sponges.…”

Section: Ovipositor Lengthmentioning

confidence: 66%

“…Secondly, that only ostracophilous sculpins, and not species that lay eggs on rock surfaces, would have elongated ovipositors. The morphological and molecular phylogeny of the sculpins suggests that ostracophilous sculpins have evolved from non-ostracophilous sculpins (Yabe 1985;Abe and Munehara 2009;Koya et al 2011;Knope 2013). Therefore, the development of the ovipositor is likely related to such unique spawning behaviour.…”

Section: Introductionmentioning

confidence: 99%

Host selection and ovipositor length in eight sympatric species of sculpins that deposit their eggs into tunicates or sponges

et al. 2019

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Interspecific interactions between parasites and hosts can influence the evolution of behavioural and morphological adaptations of both parasites and their hosts. There is, however, little empirical evidence available regarding the evolution of reproductive traits driven by these interactions. In this paper, we investigated host selection and ovipositor length in nine sympatric marine sculpins that oviposit into tunicates or sponges. Field and genetic studies have revealed host use for eight out of nine species of sculpins investigated here: five species of Pseudoblennius, two species of Furcina and one species of Vellitor. For one species studied (V. minutus), no egg masses could be found. Ovipositor length reflects morphology of host species utilised: six sculpin species had extremely long ovipositors allowing females to attach eggs to the deep atrium of solitary tunicates, whereas the two species that attached their eggs to the small space of atrial siphon of colonial tunicates and the spongocoel of sponges had short ovipositors. Ovipositor length varied between solitary-tunicate spawners and species with longer ovipositors selected larger tunicates. Since the ancestral form is non-parasitic, the ovipositor evolved as an adaptation to utilise sponges and tunicates as hosts. Sculpins found sympatrically may show host specificity to avoid interspecific competition for spawning niches and ovipositors may have evolved depending on the species and size of host invertebrates.

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“… Notes. 1 Abe & Munehara (2009) 2 Bolin (1941) 3 Bolin (1944) 4 Hann (1930) 5 Hubbs (1966) 6 Misitano (1980) 7 Morris (1952) 8 Morris (1956) 9 Petersen et al (2005) 10 Mecklenburg, Mecklenburg & Thorsteinson (2002) 11 Jackson (2003) 12 Miller & Lea (1972) 13 Eschmeyer, Herald & Hammann (1983) 14 Marliave (1981) 15 Koya et al (2011) * Minimum and maximum depth are taken from the depth range that contains 95% of museum collection depths for each species. See Methods section and Table S4 .…”

Section: Methodsmentioning

confidence: 99%

“…Spermatozoon morphology (Oval, intermediate, slender). Character states were adapted from descriptions in the literature ( Hann, 1930 ; Petersen et al, 2005 ; Koya et al, 2011 ). Slender sperm morphology is associated with internal insemination in many groups of fishes ( Mattei, 1991 ).…”

Section: Methodsmentioning

confidence: 99%

Littorally adaptive? Testing the link between habitat, morphology, and reproduction in the intertidal sculpin subfamily Oligocottinae (Pisces: Cottoidea)

Buser

Burns

López

2017

PeerJ

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While intertidal habitats are often productive, species-rich environments, they are also harsh and highly dynamic. Organisms that live in these habitats must possess morphological and physiological adaptations that enable them to do so. Intertidal fishes are generally small, often lack scales, and the diverse families represented in intertidal habitats often show convergence into a few general body shapes. However, few studies have quantified the relationship between phenotypes and intertidal living. Likewise, the diversity of reproductive traits and parental care in intertidal fishes has yet to be compared quantitatively with habitat. We examine the relationship of these characters in the sculpin subfamily Oligocottinae using a phylogenetic hypothesis, geometric morphometrics, and phylogenetic comparative methods to provide the first formal test of associations between fish phenotypes and reproductive characters with intertidal habitats. We show that the ability to live in intertidal habitats, particularly in tide pools, is likely a primitive state for Oligocottinae, with a single species that has secondarily come to occupy only subtidal habitats. Contrary to previous hypotheses, maximum size and presence of scales do not show a statistically significant correlation with depth. However, the maximum size for all species is generally small (250 mm or less) and all show a reduction in scales, as would be expected for an intertidal group. Also contrary to previous hypotheses, we show that copulation and associated characters are the ancestral condition in Oligocottinae, with copulation most likely being lost in a single lineage within the genus Artedius. Lastly, we show that body shape appears to be constrained among species with broader depth ranges, but lineages that occupy only a narrow range of intertidal habitats display novel body shapes, and this may be associated with habitat partitioning, particularly as it relates to the degree of wave exposure.

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

Cited by 9 publications

References 28 publications

Fertilization modes drive the evolution of sperm traits in Baikal sculpins

Fertilization modes drive the evolution of sperm traits in Baikal sculpins

Host selection and ovipositor length in eight sympatric species of sculpins that deposit their eggs into tunicates or sponges

Littorally adaptive? Testing the link between habitat, morphology, and reproduction in the intertidal sculpin subfamily Oligocottinae (Pisces: Cottoidea)

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