Distribution, status and threats of the freshwater pearl
Dolmen D and Kleiven E. 2008. Distribution, status and threats of the freshwater pearl mussel Margaritifera margaritifera (Linnaeus) (Bivalvia, Margaritiferidae) in Norway. Fauna norvegica 26/27: 3-14.The distribution of Margaritifera margaritifera (Linnaeus) in Norway is mainly along the coast and...
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Norwegian University of Science and Technology (NTNU), University Museum
2009
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ftntnutrondhojs:oai:www.ntnu.no/ojs:article/569 2023-05-15T16:13:44+02:00 Distribution, status and threats of the freshwater pearl Dolmen, Dag Kleiven, Einar 2009-12-16 application/pdf http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/569 https://doi.org/10.5324/fn.v26i0.569 eng eng Norwegian University of Science and Technology (NTNU), University Museum http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/569/535 Copyright (c) 2009 Dag Dolmen, Einar Kleiven http://creativecommons.org/licenses/by-nc/4.0 CC-BY-NC Fauna norvegica; Vol 26 (2008) 1891-5396 1502-4873 Bivalvia; distribution; biogeography; conservation info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2009 ftntnutrondhojs https://doi.org/10.5324/fn.v26i0.569 2017-08-09T19:53:05Z Dolmen D and Kleiven E. 2008. Distribution, status and threats of the freshwater pearl mussel Margaritifera margaritifera (Linnaeus) (Bivalvia, Margaritiferidae) in Norway. Fauna norvegica 26/27: 3-14.The distribution of Margaritifera margaritifera (Linnaeus) in Norway is mainly along the coast and in the lowland. Based on a questionnaire sent to county governors’ offices and municipal administrations in Norway, about 430 former and existing localities have been recorded, of which about 300 are still-existing. However, the real number is probably more than twice as large. Central Norway has the highest number of documented sites. The northernmost locality is at Berlevåg (Finnmark) at 70°50’N lat., and the highest verified record is near Snåsa (Central Norway) at 472 m a.s.l. The great majority of localities are associated with Cambro-Silurian volcano-sedimentary rocks or situated below the postglacial marine limit, i.e. in areas not too poor in calcium. The species is an early immigrant, and a landlocked population in Central Norway has probably existed since 8900 14C-yr B.P. The pearl mussel has become extinct during the past few decades at as many as 30% of its localities, mostly due to urbanisation and pollution. There is a high correlation between the density of people in a county (or the proportion of cultivated land) and the “density” of extinct pearl mussel populations (r=0.91). Other threats considered were hydropower regulations, excavations and constructional work in the watercourse, fishing for pearls, acidification and natural droughts or floods. In spite of the negative trend, some large populations still exist, with local densities >100 ind. m-2 and numbers of up to 1 mill. ind. km-1 river stretch. The Norwegian stock probably consists of >300 mill. ind. Article in Journal/Newspaper Finnmark Finnmark NTNU Open Access Journals (Norwegian University of Science and Technology) Norway Berlevåg ENVELOPE(29.085,29.085,70.857,70.857) Fauna norvegica 26 |
institution |
Open Polar |
collection |
NTNU Open Access Journals (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondhojs |
language |
English |
topic |
Bivalvia; distribution; biogeography; conservation |
spellingShingle |
Bivalvia; distribution; biogeography; conservation Dolmen, Dag Kleiven, Einar Distribution, status and threats of the freshwater pearl |
topic_facet |
Bivalvia; distribution; biogeography; conservation |
description |
Dolmen D and Kleiven E. 2008. Distribution, status and threats of the freshwater pearl mussel Margaritifera margaritifera (Linnaeus) (Bivalvia, Margaritiferidae) in Norway. Fauna norvegica 26/27: 3-14.The distribution of Margaritifera margaritifera (Linnaeus) in Norway is mainly along the coast and in the lowland. Based on a questionnaire sent to county governors’ offices and municipal administrations in Norway, about 430 former and existing localities have been recorded, of which about 300 are still-existing. However, the real number is probably more than twice as large. Central Norway has the highest number of documented sites. The northernmost locality is at Berlevåg (Finnmark) at 70°50’N lat., and the highest verified record is near Snåsa (Central Norway) at 472 m a.s.l. The great majority of localities are associated with Cambro-Silurian volcano-sedimentary rocks or situated below the postglacial marine limit, i.e. in areas not too poor in calcium. The species is an early immigrant, and a landlocked population in Central Norway has probably existed since 8900 14C-yr B.P. The pearl mussel has become extinct during the past few decades at as many as 30% of its localities, mostly due to urbanisation and pollution. There is a high correlation between the density of people in a county (or the proportion of cultivated land) and the “density” of extinct pearl mussel populations (r=0.91). Other threats considered were hydropower regulations, excavations and constructional work in the watercourse, fishing for pearls, acidification and natural droughts or floods. In spite of the negative trend, some large populations still exist, with local densities >100 ind. m-2 and numbers of up to 1 mill. ind. km-1 river stretch. The Norwegian stock probably consists of >300 mill. ind. |
format |
Article in Journal/Newspaper |
author |
Dolmen, Dag Kleiven, Einar |
author_facet |
Dolmen, Dag Kleiven, Einar |
author_sort |
Dolmen, Dag |
title |
Distribution, status and threats of the freshwater pearl |
title_short |
Distribution, status and threats of the freshwater pearl |
title_full |
Distribution, status and threats of the freshwater pearl |
title_fullStr |
Distribution, status and threats of the freshwater pearl |
title_full_unstemmed |
Distribution, status and threats of the freshwater pearl |
title_sort |
distribution, status and threats of the freshwater pearl |
publisher |
Norwegian University of Science and Technology (NTNU), University Museum |
publishDate |
2009 |
url |
http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/569 https://doi.org/10.5324/fn.v26i0.569 |
long_lat |
ENVELOPE(29.085,29.085,70.857,70.857) |
geographic |
Norway Berlevåg |
geographic_facet |
Norway Berlevåg |
genre |
Finnmark Finnmark |
genre_facet |
Finnmark Finnmark |
op_source |
Fauna norvegica; Vol 26 (2008) 1891-5396 1502-4873 |
op_relation |
http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/569/535 |
op_rights |
Copyright (c) 2009 Dag Dolmen, Einar Kleiven http://creativecommons.org/licenses/by-nc/4.0 |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.5324/fn.v26i0.569 |
container_title |
Fauna norvegica |
container_volume |
26 |
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1765999577782026240 |