Genetic contribution of sexual and asexual reproduction to the recruitment of a sexually unbalanced population of Coscinasterias tenuispina (Echinodermata: Asteroidea) in Rio de Janeiro, Brazil

Pazoto, C; Ventura, Carlos Renato Rezende; Silva, E

doi:10.1201/9780203869543-c73

Echinoderms: Durham 2009

DOI: 10.1201/9780203869543-c73

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Genetic contribution of sexual and asexual reproduction to the recruitment of a sexually unbalanced population of Coscinasterias tenuispina (Echinodermata: Asteroidea) in Rio de Janeiro, Brazil

C Pazoto¹,

Carlos Renato Rezende Ventura²,

E Silva³

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Cited by 2 publications

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“…Some authors have even suggested that species of the genus have populations strictly maintained by asexual reproduction (Barker 2013). This hypothesis is at least partially supported by some genetic studies that detected only a few genotypes in some of populations (Haramoto, Komatsu, & Yamazaki, 2006;Pazoto, Ventura, & Silva, 2010;Perrin, Wing, & Roy, 2004;Sk€ old, Wing, & Mladenov, 2003;Ventura, Alves, Maur ıcio, & Silva, 2004). However, it worth mentioning that some of those studies used low-resolution genetic markers that might underestimate the real number of identical genotypes (clones), thereby masking the standing genetic diversity.…”

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confidence: 91%

Intraspecific genetic structure, divergence and high rates of clonality in an amphi‐Atlantic starfish

et al. 2018

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Intraspecific genetic diversity and divergence have a large influence on the adaption and evolutionary potential of species. The widely distributed starfish, Coscinasterias tenuispina, combines sexual reproduction with asexual reproduction via fission. Here we analyse the phylogeography of this starfish to reveal historical and contemporary processes driving its intraspecific genetic divergence. We further consider whether asexual reproduction is the most important method of propagation throughout the distribution range of this species. Our study included 326 individuals from 16 populations, covering most of the species' distribution range. A total of 12 nuclear microsatellite loci and sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene were analysed. COI and microsatellites were clustered in two isolated lineages: one found along the southwestern Atlantic and the other along the northeastern Atlantic and Mediterranean Sea. This suggests the existence of two different evolutionary units. Marine barriers along the European coast would be responsible for population clustering: the Almeria-Oran Front that limits the entrance of migrants from the Atlantic to the Mediterranean, and the Siculo-Tunisian strait that divides the two Mediterranean basins. The presence of identical genotypes was detected in all populations, although two monoclonal populations were found in two sites where annual mean temperatures and minimum values were the lowest. Our results based on microsatellite loci showed that intrapopulation genetic diversity was significantly affected by clonality whereas it had lower effect for the global phylogeography of the species, although still some impact on populations' genetic divergence could be observed between some populations.

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confidence: 91%

Intraspecific genetic structure, divergence and high rates of clonality in an amphi‐Atlantic starfish

et al. 2018

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Genetic homogeneity, lack of larvae recruitment, and clonality in absence of females across western Mediterranean populations of the starfish Coscinasterias tenuispina

Pérez‐Portela

García-Cisneros

Campos-Canet

et al. 2021

Sci Rep

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We here analysed the populations’ genetic structure of Coscinasterias tenuispina, an Atlantic-Mediterranean fissiparous starfish, focusing on the western Mediterranean, to investigate: the distribution and prevalence of genetic variants, the relative importance of asexual reproduction, connectivity across the Atlantic-Mediterranean transition, and the potential recent colonisation of the Mediterranean Sea. Individuals from 11 Atlantic-Mediterranean populations of a previous study added to 172 new samples from five new W Mediterranean sites. Individuals were genotyped at 12 microsatellite loci and their gonads histologically analysed for sex determination. Additionally, four populations were genotyped at two-time points. Results demonstrated genetic homogeneity and low clonal richness within the W Mediterranean, due to the dominance of a superclone, but large genetic divergence with adjacent areas. The lack of new genotypes recruitment over time, and the absence of females, confirmed that W Mediterranean populations were exclusively maintained by fission and reinforced the idea of its recent colonization. The existence of different environmental conditions among basins and/or density-depend processes could explain this lack of recruitment from distant areas. The positive correlation between clonal richness and heterozygote excess suggests that most genetic diversity is retained within individuals in the form of heterozygosity in clonal populations, which might increase their resilience.

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Genetic contribution of sexual and asexual reproduction to the recruitment of a sexually unbalanced population of Coscinasterias tenuispina (Echinodermata: Asteroidea) in Rio de Janeiro, Brazil

Cited by 2 publications

References 4 publications

Intraspecific genetic structure, divergence and high rates of clonality in an amphi‐Atlantic starfish

Intraspecific genetic structure, divergence and high rates of clonality in an amphi‐Atlantic starfish

Genetic homogeneity, lack of larvae recruitment, and clonality in absence of females across western Mediterranean populations of the starfish Coscinasterias tenuispina

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