Reproduction and population genetics of Coscinasterias tenuispina (Asteroidea

Ventura, Carlos Renato Rezende; Alves, Sandro Leonardo; Silva, E; Maur√≠cio, C

doi:10.1201/9780203970881.ch15

Cited by 5 publications

(7 citation statements)

References 3 publications

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“…Some authors have even suggested that species of the genus have populations strictly maintained by asexual reproduction (Barker ). This hypothesis is at least partially supported by some genetic studies that detected only a few genotypes in some of populations (Haramoto, Komatsu, & Yamazaki, ; Pazoto, Ventura, & Silva, ; Perrin, Wing, & Roy, ; Sköld, Wing, & Mladenov, ; Ventura, Alves, Maurício, & Silva, ). 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.…”

Section: Introductionmentioning

confidence: 74%

“…There is a growing body of literature that has shown that asexual reproduction can have important influences on the genetic architecture of marine invertebrates (Ayre & Hughes, ; Calderón et al., ; Sherman et al., ; Yeoh & Dai, ; Zilberberg, Solé‐Cava, & Klautau, ), although large‐scale studies exploring phylogeographic patterns of solitary benthic invertebrates with asexual reproduction are still relatively scarce (see some examples in Johnson & Threlfau, ; Uthicke et al., ; Sköld et al., ; Ventura et al., ; Perrin et al., ; Haramoto et al., ). The lack of empirical studies that evaluate the effects of asexual reproduction on the intraspecific divergence and connectivity of marine invertebrates limits our understanding of the evolutionary potential of species with complex life cycles and prevents us from developing appropriate theoretical concepts related to the population genetics of asexual species.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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

et al. 2018

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“…The species Coscinasterias tenuispina (Lamark 1816), widely distributed throughout the Atlantic Ocean and Mediterranean Sea, presents in some cases populations either consisting of individuals of only one gender (usually males) or with an unbalanced proportion of males and females (Alves et al, 2002;authors' unpublished data). The absence of one gender in some populations of this species, as well dominance of a few genotypes-according to allozyme analyses (Ventura et al, 2004) -suggests that maintenance of these populations takes place solely via asexual reproduction.…”

Section: Introductionmentioning

confidence: 99%

Long telomeres are associated with clonality in wild populations of the fissiparous starfish Coscinasterias tenuispina

et al. 2015

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Telomeres usually shorten during an organism's lifespan and have thus been used as an aging and health marker. When telomeres become sufficiently short, senescence is induced. The most common method of restoring telomere length is via telomerase reverse transcriptase activity, highly expressed during embryogenesis. However, although asexual reproduction from adult tissues has an important role in the life cycles of certain species, its effect on the aging and fitness of wild populations, as well as its implications for the long-term survival of populations with limited genetic variation, is largely unknown. Here we compare relative telomere length of 58 individuals from four populations of the asexually reproducing starfish Coscinasterias tenuispina. Additionally, 12 individuals were used to compare telomere lengths in regenerating and non-regenerating arms, in two different tissues (tube feet and pyloric cecum). The level of clonality was assessed by genotyping the populations based on 12 specific microsatellite loci and relative telomere length was measured via quantitative PCR. The results revealed significantly longer telomeres in Mediterranean populations than Atlantic ones as demonstrated by the Kruskal-Wallis test (K = 24.17, significant value: P-valueo0.001), with the former also characterized by higher levels of clonality derived from asexual reproduction. Telomeres were furthermore significantly longer in regenerating arms than in non-regenerating arms within individuals (pyloric cecum tissue: Mann-Whitney test, V = 299, P-valueo10 − 6 ; and tube feet tissue Student's t = 2.28, P-value = 0.029). Our study suggests that one of the mechanisms responsible for the long-term somatic maintenance and persistence of clonal populations is telomere elongation.

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“…Thus, the former are expected to have a higher gene flow, lower genetic divergence and, consequently, lower levels of population structure than the latter ( Hoskin, 1997 ; Murray-Jones and Ayre, 1997 ; Collin, 2001 ) . Genetic differences among local populations generally depend upon the relationship between dispersal and survival ( Ventura et al , 2004 ).…”

Section: Introductionmentioning

confidence: 99%

Significant genetic differentiation among populations of Anomalocardia brasiliana (Gmelin, 1791): a bivalve with planktonic larval dispersion

et al. 2009

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Four Brazilian populations of Anomalocardia brasiliana were tested for mutual genetic homogeneity, using data from 123 sequences of the mtDNA cytochrome oxidase c subunit I gene. A total of 36 haplotypes were identified, those shared being H3 (Canela Island, Prainha and Acupe) and both H5 and H9 (Prainha and Acupe). Haplotype diversity values were high, except for the Camurupim population, whereas nucleotide values were low in all the populations, except for that of Acupe. Only the Prainha population showed a deviation from neutrality and the SSD test did not reject the demographic expansion hypothesis. Fst values showed that the Prainha and Acupe populations represent a single stock, whereas in both the Canela Island and Camurupim stocks, population structures are different and independent. The observed structure at Canela Island may be due to the geographic distance between this population and the remainder. The Camurupim population does not share any haplotype with the remaining populations in northeastern Brazil. The apparent isolation could be due to the rocky barrier located facing the mouth of the Mamanguape River. The results highlight the importance of wide-scale studies to identify and conserve local genetic diversity, especially where migration is restricted.

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Reproduction and population genetics of Coscinasterias tenuispina (Asteroidea

Cited by 5 publications

References 3 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

Long telomeres are associated with clonality in wild populations of the fissiparous starfish Coscinasterias tenuispina

Significant genetic differentiation among populations of Anomalocardia brasiliana (Gmelin, 1791): a bivalve with planktonic larval dispersion

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