Genetics do not reflect habitat differences in<i>Riseriellus occultus</i>(Heteronemertea, Nemertea) from Spain and Wales

Sundberg, Per; Strand, Malin

doi:10.1080/17451000601182619

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…Rogers et al (1997) found evidence of low genetic differentiation in populations of two different free-living nemertean species, which are separated by large geographic distances (thousands of km). Thornhill et al (2008) and Sundberg and Strand (2007), using partial COI and 16S gene sequences, also detected a homogeneous genetic structure in populations of the heteronemertean Parborlasia corrugatus from South America and of Riseriellus occulatus from Spain and Wales, respectively. Thornhill et al (2008) only observed genetic structure on either side of Drake Passage, a strong barrier to gene flow.…”

Section: Discussionmentioning

confidence: 83%

“…Few studies in nemertean biology have examined the genetic structure of nemertean populations (Sundberg and Strand 2007;Thornhill et al 2008;Andrade et al 2011). Here, we present the first genetic characterization of the genetic diversity, population structure and recent demographic history of the entocommensal nemertean Malacobdella arrokeana Ivanov et al 2002.…”

Section: Introductionmentioning

confidence: 91%

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Mitochondrial and nuclear markers reveal a lack of genetic structure in the entocommensal nemertean Malacobdella arrokeana in the Patagonian gulfs

2012

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Malacobdella arrokeana is an entocommensal nemertean exclusively found in the bivalve geoduck Panopea abbreviata, and it is the only representative of the genus in the southern hemisphere. To characterize its genetic diversity, population structure and recent demographic history, we conducted the first genetic survey on this species, using sequence data for the cytochrome oxidase I gene (COI), 16S rRNA (16S) and the internal transcribed spacer (ITS2). Only four different ITS2 genotypes were found in the whole sample, and the two main haplotypes identified in the mitochondrial dataset were present among all localities with a diversity ranging from 0.583 to 0.939. Nucleotide diversity was low (p = 0.001-0.002). No significant genetic structure was detected between populations, and mismatch distribution patterns and neutrality tests results are consistent with a population in expansion or under selection. Analysis of molecular variance (AMOVA) revealed that the largest level of variance observed was due to intrapopulation variation (100, 100 and 94.39 % for 16S, COI and ITS2, respectively). F st values were also non-significant. The observed lack of population structure is likely due to high levels of genetic connectivity in combination with the lack or permeability of biogeographic barriers and episodes of habitat modification.

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Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 91%

Mitochondrial and nuclear markers reveal a lack of genetic structure in the entocommensal nemertean Malacobdella arrokeana in the Patagonian gulfs

2012

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“…The distances within subnetworks are less than 34% (minimum 2%), while 'orphan' (unconnected haplotypes) and inter-network distances are above 18%, reaching more than 28% (between specimens 270 and 273 contra almost all other specimens). Although these figures cannot be taken for species limits, previous studies of COI differences in nemerteans (Strand & Sundberg 2005;Sundberg & Strand 2007) indicate that specimens within networks are conspecific and that subnetworks ⁄ orphans represent different species.…”

Section: Resultsmentioning

confidence: 97%

DNA barcoding should accompany taxonomy – the case of Cerebratulus spp (Nemertea)

Sundberg

Vodoti

Strand

2010

Molecular Ecology Resources

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Many issues in DNA barcoding need to be solved before it can reach its goal to become a general database for species identification. While species delimitations are more or less well established in several taxa, there are still many groups where this is not the case. Without the proper taxonomic background/knowledge and corroboration with other kinds of data, the DNA barcoding approach may fail to identify species accurately. The classification and taxonomy of phylum Nemertea (nemerteans, ribbon worms) are traditionally based on morphology, but are not corroborated by an increasing amount of genetic data when it comes to classification either into species or into higher taxa. The taxonomy of the phylum needs to be improved before the full potential of DNA barcoding can be utilized to make sure that valid Linnean names accompany the barcode sequences. We illustrate the problematic situation in the phylum Nemertea by a case study from the genus Cerebratulus.

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“…Bootstrap support values were calculated using 1000 pseudoreplicates. Thollesson and Norenburg (2003); j Sundberg and Strand (2007).…”

Section: Methodsmentioning

confidence: 99%

A histology-free description of the branched-proboscis ribbonworm Gorgonorhynchus albocinctus sp. nov. (Nemertea: Heteronemertea)

Kajihara¹

2015

Publ. SMBL

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A new species of heteronemertean with branched proboscis, Gorgonorhynchus albocinctus sp. nov., is described based on the external feature and DNA sequences from a specimen collected subtidally among coral rubbles at a depth of about 6 m in a reef area around Taketomi Island in the Yaeyama Islands, southwestern Japan. It can be classified in the genus because the mode of proboscis branching is dichotomous, rather than alternating laterally. From the two known congeners G. repens Dakin andFordham, 1931 and G. bermudensis Wheeler, 1940, the new species can be differentiated by having a brown body colour with a white band near the tip of the head. The new species is placed in a molecular phylogenetic context with a maximum-likelihood analysis using the nuclear 18S rRNA and 28S RNA genes, as well as the mitochondrial cytochrome c oxidase subunit I gene, together with 20 species of heteronemerteans, for which those sequences were available in the public databases. The results indicate that G. albocinctus is closely related to Cerebratulus leucopsis (Coe, 1901), a species that is supposed to have a non-branched proboscis.

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Genetics do not reflect habitat differences inRiseriellus occultus(Heteronemertea, Nemertea) from Spain and Wales

Cited by 11 publications

References 12 publications

Mitochondrial and nuclear markers reveal a lack of genetic structure in the entocommensal nemertean Malacobdella arrokeana in the Patagonian gulfs

Mitochondrial and nuclear markers reveal a lack of genetic structure in the entocommensal nemertean Malacobdella arrokeana in the Patagonian gulfs

DNA barcoding should accompany taxonomy – the case of Cerebratulus spp (Nemertea)

A histology-free description of the branched-proboscis ribbonworm Gorgonorhynchus albocinctus sp. nov. (Nemertea: Heteronemertea)

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