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Origin and route of establishment of the invasive Pacific oyster Crassostrea gigas in Scandinavia ArchiMer
Faust, Ellika; Andre, Carl; Meurling, Sara; Kochmann, Judith; Christiansen, Henrik; Jensen, Lasse Fast; Charrier, Gregory; Laugen, Ane T.; Strand, Asa.
Identifying the routes and rates of introductions is fundamental for the understanding of marine invasions. Recurring introductions over the last 50 yr have led to the establishment of feral Pacific oyster Crassostrea gigas populations throughout Europe. In the northern countries, Sweden and Norway, the species first occurred in large numbers in 2006. Here, we investigated the relative importance of introduction via re-laying of cultured oysters imported for consumption from France, Ireland or the Netherlands, and dispersal of oyster larvae by ocean currents from wild oyster populations in Denmark. Using microsatellite DNA markers, we estimated genetic differentiation among Pacific oysters collected at 4 Swedish locations, 3 Norwegian locations and 9...
Tipo: Text Palavras-chave: Population genetics; Microsatellites; Range expansion; Non-native species; Aquaculture; Connectivity; Scandinavia; Skagerrak.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00395/50627/72574.pdf
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Morphological, ecological and molecular characterization of the enigmatic planispiral snail genus Adeuomphalus (Vetigastropoda : Seguenzioidea) ArchiMer
Kano, Yasunori; Chikyu, Eri; Waren, Anders.
Adeuomphalus Seguenza, 1876 is a little known genus among the skeneimorph vetigastropods, with very few specimens previously reported alive from the deep sea. We examined newly collected and museum-stored specimens from upper to lower bathyal depths in the Atlantic, Mediterranean, Pacific and Indian Oceans and recognize seven recent species in the genus: A. ammoniformis Seguenza, 1876, A. densicostatus (Jeffreys, 1884), A. trochanter Waren & Bouchet, 2001, A. sinuosus (Sykes, 1925) n. comb., A. guillei n. sp., A. elegans n. sp. and A. collinsi n. sp., along with a fossil species, A. bandeli (Schroder, 1995) from the Lower Cretaceous, Poland. These species are characterized by a minute and colourless shell with almost perfectly planispiral whorls, an...
Tipo: Text Palavras-chave: Hydrothermal vents; Seguenziidae mollusca; New Zealand; Gastropoda; Trochoidea; Phylogeny; Pacific; Scandinavia; Turbinidae.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/00205/31660/30092.pdf
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A Near-extinction Event in Lynx: Do Microsatellite Data Tell the Tale? Ecology and Society
Spong, Goran; Evolutionary Biology Centre, Uppsala University; goran.spong@ebc.uu.se; Hellborg, Linda; Evolutionary Biology Centre, Uppsala University; linda.hellborg@ebc.uu.se.
Fluctuations in population size can have a profound impact on effective population size and the maintenance of genetic variation within a population. A number of tests based on microsatellite data have been developed for the detection of bottleneck events in a population's past. In this paper, we search for signs of a bottleneck in microsatellite data on the Scandinavian lynx (Lynx lynx) population. This population was hunted to the brink of extinction, with fewer than 100 animals (one estimate was as low as 30 individuals) remaining in the late 1920s. Protection allowed recovery of the population, which currently numbers about 2000 adults. Despite this pronounced demographic bottleneck (more than 95% of the population was killed), we could find no...
Tipo: Peer-Reviewed Reports Palavras-chave: Bottleneck; Conservation; Extinction; Genetic testing; Lynx; Microsatellite data; Population history; Scandinavia.
Ano: 2002
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