Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004
Samples were collected in Svalbard, Norway, during April and May 2002-2004 from 272 ringed seals (Pusa hispida; 62.5% males, 37.5% females) to study growth and population parameters. The age of the animals ranged from 1 to 32 years. Asymptotic values for standard length and body mass were 127.7±1.6...
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Norwegian Polar Institute
2008
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npolardata:oai:npolar.no:dataset/96232426-0829-5e2f-87f3-bb3cdd2042b8 2024-03-03T22:15:37+00:00 Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 Kovacs, Kit M. Haug, Tore Krafft, Bjørn Lydersen, Christian Frie, Anne Kristine BEGINDATE: 2002-04-01 ENDDATE: 2003-05-31 ENVELOPE(16.5,16.5,78.25,78.25) OCEAN, ATLANTIC OCEAN, NORTH ATLANTIC OCEAN, SVALBARD AND JAN MAYEN, Spitsbergen GEOGRAPHIC REGION, ARCTIC GEOGRAPHIC REGION, POLAR 2008-07-09 http://data.npolar.no/dataset/96232426-0829-5e2f-87f3-bb3cdd2042b8 unknown Norwegian Polar Institute BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS Dataset 2008 npolardata 2017-09-07T07:14:17Z Samples were collected in Svalbard, Norway, during April and May 2002-2004 from 272 ringed seals (Pusa hispida; 62.5% males, 37.5% females) to study growth and population parameters. The age of the animals ranged from 1 to 32 years. Asymptotic values for standard length and body mass were 127.7±1.6 (s.e.) cm and 69.0±2.7 kg for males (maxima: 144 cm and 92 kg) and 127.6±2.3 cm and 68.9±2.5 kg for females (maxima: 141 cm and 91 kg). All animals were sexually mature at an age ≥6 years and the ovulation rate was 0.86. Mean Age at Maturity (MAM) was 4.2±0.2 years for males and 3.5±0.3 years for females, values significantly lower than calculated for ringed seals from the same area 20 years ago. This change in MAM suggests that either the prey base for ringed seals in the area has increased or alternatively that the density of ringed seals has declined, such that more resources are available per capita. If the climate of the Arctic changes in the manner predicted by a host of climate-change scenarios, it is likely to have a strong impact on ringed seal populations in future, although there are no data to suggest that dramatic changes have taken place yet in fish and invertebrate populations in the Svalbard area. Although cause-and-effect cannot be firmly established, there is a possibility that the substantial increase in the number of polar bears (Ursus maritimus) over the past 20 years, since hunting the species in Svalbard ceased in 1973, may have played a role in the observed change in the ringed seal population. Dataset Arctic Climate change Jan Mayen North Atlantic Pusa hispida ringed seal Svalbard Ursus maritimus Spitsbergen walrus* Norwegian Polar Data Centre Arctic Svalbard Norway Jan Mayen Svalbard ENVELOPE(20.000,20.000,78.000,78.000) ENVELOPE(16.5,16.5,78.25,78.25) |
institution |
Open Polar |
collection |
Norwegian Polar Data Centre |
op_collection_id |
npolardata |
language |
unknown |
topic |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS |
spellingShingle |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS Kovacs, Kit M. Haug, Tore Krafft, Bjørn Lydersen, Christian Frie, Anne Kristine Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 |
topic_facet |
BIOTA biology EARTH SCIENCE BIOLOGICAL CLASSIFICATION ANIMALS/VERTEBRATES MAMMALS CARNIVORES SEALS/SEA LIONS/WALRUSES BIOSPHERE ECOLOGICAL DYNAMICS |
description |
Samples were collected in Svalbard, Norway, during April and May 2002-2004 from 272 ringed seals (Pusa hispida; 62.5% males, 37.5% females) to study growth and population parameters. The age of the animals ranged from 1 to 32 years. Asymptotic values for standard length and body mass were 127.7±1.6 (s.e.) cm and 69.0±2.7 kg for males (maxima: 144 cm and 92 kg) and 127.6±2.3 cm and 68.9±2.5 kg for females (maxima: 141 cm and 91 kg). All animals were sexually mature at an age ≥6 years and the ovulation rate was 0.86. Mean Age at Maturity (MAM) was 4.2±0.2 years for males and 3.5±0.3 years for females, values significantly lower than calculated for ringed seals from the same area 20 years ago. This change in MAM suggests that either the prey base for ringed seals in the area has increased or alternatively that the density of ringed seals has declined, such that more resources are available per capita. If the climate of the Arctic changes in the manner predicted by a host of climate-change scenarios, it is likely to have a strong impact on ringed seal populations in future, although there are no data to suggest that dramatic changes have taken place yet in fish and invertebrate populations in the Svalbard area. Although cause-and-effect cannot be firmly established, there is a possibility that the substantial increase in the number of polar bears (Ursus maritimus) over the past 20 years, since hunting the species in Svalbard ceased in 1973, may have played a role in the observed change in the ringed seal population. |
format |
Dataset |
author |
Kovacs, Kit M. Haug, Tore Krafft, Bjørn Lydersen, Christian Frie, Anne Kristine |
author_facet |
Kovacs, Kit M. Haug, Tore Krafft, Bjørn Lydersen, Christian Frie, Anne Kristine |
author_sort |
Kovacs, Kit M. |
title |
Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 |
title_short |
Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 |
title_full |
Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 |
title_fullStr |
Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 |
title_full_unstemmed |
Growth and population parameters of ringed seals (Pusa hispida) from Svalbard, Norway, 2002-2004 |
title_sort |
growth and population parameters of ringed seals (pusa hispida) from svalbard, norway, 2002-2004 |
publisher |
Norwegian Polar Institute |
publishDate |
2008 |
url |
http://data.npolar.no/dataset/96232426-0829-5e2f-87f3-bb3cdd2042b8 |
op_coverage |
BEGINDATE: 2002-04-01 ENDDATE: 2003-05-31 ENVELOPE(16.5,16.5,78.25,78.25) OCEAN, ATLANTIC OCEAN, NORTH ATLANTIC OCEAN, SVALBARD AND JAN MAYEN, Spitsbergen GEOGRAPHIC REGION, ARCTIC GEOGRAPHIC REGION, POLAR |
long_lat |
ENVELOPE(20.000,20.000,78.000,78.000) ENVELOPE(16.5,16.5,78.25,78.25) |
geographic |
Arctic Svalbard Norway Jan Mayen Svalbard |
geographic_facet |
Arctic Svalbard Norway Jan Mayen Svalbard |
genre |
Arctic Climate change Jan Mayen North Atlantic Pusa hispida ringed seal Svalbard Ursus maritimus Spitsbergen walrus* |
genre_facet |
Arctic Climate change Jan Mayen North Atlantic Pusa hispida ringed seal Svalbard Ursus maritimus Spitsbergen walrus* |
_version_ |
1792545057372372992 |