Cryptic divergence and strong population structure in the colonial invertebrate Pycnoclavella communis (Ascidiacea) inferred from molecular data

Pérez‐Portela, Rocío; Turon, Xavier

doi:10.1016/j.zool.2007.06.006

Cited by 51 publications

(46 citation statements)

References 75 publications

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“…However, values of genetic diversity of COI for P. japonica in Carantec-Callot were comparable with those of some native species of colonial ascidians in Europe, such as Cystodytes dellechiajei and Pycnoclavella communis , Pérez-Portela & Turon 2008), but lower than that for other introduced species such as Botryllus schlosseri (Ben-Shlomo et al 2006 and Microcosmus squa miger (Rius et al 2008), in which multiple introductions with genetic admixture from diverse sources have been assumed.…”

Section: Discussionmentioning

confidence: 66%

“…To analyze the genetic structure in time and space of introduced populations of Perophora japonica in Europe, we selected the mitochondrial cytochrome c oxidase subunit I gene (COI) because it offers a good level of genetic variation suitable for population genetic analyses , Pérez-Portela & Turon 2008, Stefaniak et al 2009). The specific objectives of the present study were to (1) analyze temporal changes in genetic diversity of a population of P. japonica soon after its initial arrival in a non-native area in Europe and (2) explore the distribution of the genetic diversity of this species in NW Europe.…”

Section: Introductionmentioning

confidence: 99%

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Bottlenecks and loss of genetic diversity: spatio-temporal patterns of genetic structure in an ascidian recently introduced in Europe

Pérez‐Portela¹,

Turon²,

Bishop³

2012

Mar. Ecol. Prog. Ser.

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We explored temporal patterns of genetic diversity and spatial genetic structure of the recently introduced ascidian Perophora japonica Oka, 1927 in Europe. A fragment of the mitochondrial gene cytochrome c oxidase subunit I (COI) was sequenced for 291 colonies of one population in Plymouth, UK, which was monitored for 9 yr after its initial discovery. A total of 238 colonies from 12 localities were also sequenced for population structure analyses. The temporal monitoring of the Plymouth population showed a progressive loss of genetic diversity over time attributable to a strong initial bottleneck followed by genetic drift and/or selection. Population genetic structure was consistent with the historical records of this introduction, which probably originated from oyster farming activities in France, from where the species spread to the UK and Spain. Only one population in France displayed high levels of genetic diversity, and most of the remaining populations presented very low variability. In addition, significant differentiation in terms of allele frequencies was detected between some populations. P. japonica has suffered a loss of genetic diversity in both space and time since its introduction, but this did not prevent its expansion. Accidental human transport is the most likely mechanism of spread within the introduced range. Asexual propagation modes and chimerism in this species may play an important role in introduction events. The genetic data presented here can contribute to the design of more efficient management methods for this and similar introduced species.

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Section: Discussionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Bottlenecks and loss of genetic diversity: spatio-temporal patterns of genetic structure in an ascidian recently introduced in Europe

Pérez‐Portela¹,

Turon²,

Bishop³

2012

Mar. Ecol. Prog. Ser.

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“…Understanding patterns of genetic diversity in populations of benthic marine invertebrates is necessary for assessing processes such as speciation and connectivity between populations, and also represents a powerful tool to evaluate marine protected areas (Shanks et al, 2003;Palumbi, 2004;Pérez-Portela and Turon, 2008). Studies considering connectivity between marine populations generate valuable insights for the species conservation and marine systems management.…”

Section: Introductionmentioning

confidence: 99%

Cryptic species and genetic structure in Didemnum granulatum Tokioka, 1954 (Tunicata: Ascidiacea) from the southern Brazilian coast

et al. 2014

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Didemnum granulatum is a colonial fouling ascidian that lives in subtidal substrates, worldwide. It exhibits two morphotypes, orange and beige. In this study, we verified if the color morphotypes and/or the spatial distribution of specimens in different islands might be associated to patterns of genetic structure of a single species, or if they represent distinct cryptic species. Specimens were collected in four islands, along the coast of the Santa Catarina state. A segment of 490 bp from the mitochondrial gene cytochrome c oxidase subunit 1 (COI) was amplified from 45 samples. Twenty-one haplotypes were identified. The total haplotype diversity (0.912) and the total nucleotide diversity (0.044) were high. The global Fst of the populations analyzed was 0.97, with most of the variation occurring between orange and beige groups (82.19%). The variation found between populations within groups was 15.37%, and 2.45% within populations. Haplotype networks and the neighbor-joining tree showed clear genetic divergence between individuals of distinct colors, and between the islands. These evidences strongly support the presence of a complex of two cryptic species for D. granulatum occupying the studied area. Both species were also highly genetically structured between islands, suggesting that the conservation process of these populations is complex.Keywords: ascidian, genetic diversity, population structure, islands, cryptic species. Palavras-chave: ascídia, diversidade genética, estrutura de população, ilhas, espécies crípticas. Espécies crípticas e estrutura genética em

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“…The cytochrome c oxidase I (COI) gene has been widely used in marine invertebrates offering a good level of genetic variation suitable for analyses at different scales (Tarjuelo et al 2001;Pérez-Portela and Turon 2008), from phylogenetic to population genetic analyses (Avise 2000), and being able to retain the signature of both past and present demographic events that affected the populations and species (Duran et al 2004). Moreover, this gene has successfully been used in echinoderm species making our results comparable with those previously observed for other species (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of the sea star Marthasterias glacialis (Asteroidea, Echinodermata): deep genetic divergence between mitochondrial lineages in the north-western mediterranean

2010

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We explore the phylogeography of the broadcast spawner Marthasterias glacialis along south Europe and Azores. Sequences of the cytochrome c oxidase gene from 225 specimens, belonging to 10 localities, were analysed. We found 73 haplotypes grouped within two lineages (divergence 2.9%). One lineage was AtlantoMediterranean, whereas another one was exclusively Mediterranean. Estimation of lineages split goes back to 830,000-580,000 (±120,000) years ago. This suggests that sea-level oscillations during the Pleistocene glaciations promoted gene flow interruption, lineage divergence between basins and cryptic speciation. Secondary contact between populations allowed a recolonization of the Mediterranean by the Atlantic lineage. When animals of the Atlanto-Mediterranean lineage were considered separately, F st index and AMOVA did not show significant differences between populations along either the Iberian Peninsula or basins. Isolation by distance between populations was not detected, and only populations of Plymouth and Azores showed significant differences to all the others.The remoteness of Azores islands might explain the structure of this population. Haphazard arrival of larvae and local extinctions rather than contemporary restricted gene flow might be responsible for the distinctive population structure of Plymouth.

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Cryptic divergence and strong population structure in the colonial invertebrate Pycnoclavella communis (Ascidiacea) inferred from molecular data

Cited by 51 publications

References 75 publications

Bottlenecks and loss of genetic diversity: spatio-temporal patterns of genetic structure in an ascidian recently introduced in Europe

Bottlenecks and loss of genetic diversity: spatio-temporal patterns of genetic structure in an ascidian recently introduced in Europe

Cryptic species and genetic structure in Didemnum granulatum Tokioka, 1954 (Tunicata: Ascidiacea) from the southern Brazilian coast

Phylogeography of the sea star Marthasterias glacialis (Asteroidea, Echinodermata): deep genetic divergence between mitochondrial lineages in the north-western mediterranean

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