Sexual dimorphism inSebastes

Lenarz, William H.; Echeverria, Tina

doi:10.1007/bf02296878

Cited by 16 publications

(2 citation statements)

References 9 publications

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“…Several studies have shown geographical variation in age-at-maturity depending on latitude and depth (Gunderson et al 1980;Pearson and Hightower 1991;Eldridge and Jarvis 1994;Gunderson 1996). Many species have sex-specific growth rates, which can result in differential age-at-maturity and sex-specific natural mortality rates (Love et al 1990; Lenarz and Wyllie Echeverría 1991). Typically, their growth pattern results in many species attaining marketable size at or prior to maturity, and some attaining lengths greater than 50 cm at the age of 50% maturity (Love et al 1990;Haldorson and Love 1991;Beverton 1992;Gunderson 1997).…”

Section: B Backgroundmentioning

confidence: 96%

Full Issue Article Volume 25, Issue 3

2000

Fisheries

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Section: B Backgroundmentioning

confidence: 96%

Full Issue Article Volume 25, Issue 3

2000

Fisheries

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“…The reproductive habits of Sebastes, being characterized by internal fertilization following complex courtship rituals (Shimomiya & Ezaki, 1991;Love et al, 2002), thereby suggesting the potential for selective mate choice (Hyde et al, 2008b), in fact, imply that sexual selection is acting against hybrids (e.g. Lenarz & Echeverria, 1991;Narum et al, 2004). Under the operating conditions of mate choice, hybrids may suffer from reduced mating success by sexual selection if they exhibit intermediate or aberrant reproductive phenotypes relative to those of parentals (Ritchie, 2007).…”

Section: Divergence and Hybridization Between S Vulpes And S Zonatusmentioning

confidence: 99%

Extensive hybridization and associated geographic trends between two rockfishesSebastes vulpesandS. zonatus(Teleostei:Scorpaeniformes:Sebastidae)

Muto

Kai

Nakada

et al. 2013

J of Evolutionary Biology

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Interspecific hybridization is an important evolutionary process, which has significant influence on the diversity within and between participating taxa. Although interspecific hybridization in terrestrial and freshwater organisms has been subjected to many detailed studies, studies in marine realm have been limited in terms of both numbers and detail. In this study, the potential for interspecific hybridization between two rockfishes, Sebastes vulpes and S. zonatus, occurring in the western North Pacific, was assessed on the basis of 177 specimens collected from three sampling localities within the main geographic distribution of both species, and analysed using a combination of amplified fragment length polymorphisms (AFLP), mitochondrial DNA (mtDNA) markers and morphometric characters. Bayesian-based individual genetic assignment based on 364 AFLP loci detected a total of 63 (35.6%) hybrid specimens in the data set, the presence of interspecific hybrids also being rigorously supported by mtDNA analysis using partial sequences from the control region and morphological analysis based on 31 morphometric characters. Hybrids from all three localities were found, showing a common pattern of biased introgression across the localities whereby hybrids were more closely related to S. zonatus than to S. vulpes. Apart from this common pattern, rates of hybridization varied considerably among the localities, being greater in the northern localities. Variations in the local rates of hybridization were associated with variations in habitat segregation and thermal regime, implying that vertical water temperature regimes determined the extent of habitat segregation of the two species and, accordingly, the opportunity for hybridization.

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An integrative mating system assessment of a nonmodel, economically important Pacific rockfish (Sebastes melanops) reveals nonterritorial polygamy and conservation implications for a large species flock

Karageorge

Wilson

2017

Ecology and Evolution

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Characterizing the mating systems of long‐lived, economically important Pacific rockfishes comprising the viviparous Sebastes species flock is crucial for their conservation. However, direct assignment of mating success to sires is precluded by open, offshore populations and high female fecundity. We addressed this challenge by integrating paternity‐assigned mating success of females with the adult sex ratio (ASR) of the population, male evolutionary responses to receptive females, and reproductive life history traits—in the framework of sexual selection theory—to assess the mating system of Sebastes melanops. Microsatellite parentage analysis of 17 pregnant females, 1,256 of their progeny, and 106 adults from the population yielded one to four sires per brood, a mean of two sires, and a female mate frequency distribution with a truncated normal (random) pattern. The 11 multiple paternity broods all contained higher median allele richness than the six single paternity broods (Wilcoxon test: W = 0, p < .001), despite similar levels of average heterozygosity. By sampling sperm and alleles from different males, polyandrous females gain opportunities to enhance their sperm supply and to lower the cost of mating with genetically incompatible males through reproductive compensation. A mean of two mates per mated female with a variance of one, an ASR = 1.2 females per male, and the expected population mean of 2.4 mates for mated males (and the estimated 35 unavailable sires), fits polygamous male mate frequency distributions that distinguish polygynandry and polyandrogyny mating systems, that is, variations of polygamy, but not polyandry. Inference for polygamy is consistent with weak premating sexual selection on males, expected in mid‐water, schooling S. melanops, owing to polyandrous mating, moderately aggregated receptive females, an even ASR, and no territories and nests used for reproduction. Each of these characteristics facilitates more mating males and erodes conspicuous sexual dimorphism. Evaluation of male evolutionary responses of demersal congeners that express reproductively territorial behavior revealed they have more potential mechanisms for producing premating sexual selection, greater variation in reproductive success, and a reduced breeding effective population size of adults and annual effective size of a cohort, compared to S. melanops modeled with two mates per adult. Such divergence in behavior and mating system by territorial species may differentially lower their per capita birth rates, subsequent population growth, and slow their recovery from exploitation.

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Sexual dimorphism inSebastes

Cited by 16 publications

References 9 publications

Full Issue Article Volume 25, Issue 3

Full Issue Article Volume 25, Issue 3

Extensive hybridization and associated geographic trends between two rockfishesSebastes vulpesandS. zonatus(Teleostei:Scorpaeniformes:Sebastidae)

An integrative mating system assessment of a nonmodel, economically important Pacific rockfish (Sebastes melanops) reveals nonterritorial polygamy and conservation implications for a large species flock

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