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In the period 1990–94, harp seals, Phoca groenlandica, were sampled for ecological studies in various areas and seasons in the Barents Sea. Data on total body weight, standard body length, axillary and maximum girth, dorsal and ventral blubber thickness were selected from all adult seals (defined as...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.507.3502 2023-05-15T15:38:37+02:00 and Barents Sea Harp Seals Phoca Groenl K. T. Nilssen T. Haug P. E. Grotnes V. Potelov The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.3502 http://archive.nafo.int/open/studies/s26/nilssen.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.3502 http://archive.nafo.int/open/studies/s26/nilssen.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://archive.nafo.int/open/studies/s26/nilssen.pdf Key words Barents Sea biological charactertistics harp seals. NAFO Sci. Coun. Studies 26 63–70 text ftciteseerx 2016-01-08T09:26:22Z In the period 1990–94, harp seals, Phoca groenlandica, were sampled for ecological studies in various areas and seasons in the Barents Sea. Data on total body weight, standard body length, axillary and maximum girth, dorsal and ventral blubber thickness were selected from all adult seals (defined as seals with standard body length 150 cm or more) in order to evaluate the seasonal dynamics in condition of the animals. Blubber thickness measurements and condition indices (one including length, weight and dorsal blubber thickness and the other including maximum girth and length) showed the same seasonal patterns. The seals were in poor condition in spring and early summer (May–June), the condition improved during the course of summer, and the animals were in good condition in September and in October when the mean dorsal blubber thickness was approximately 88 mm. The energy stores built up during the summer and autumn were maintained until February, whereafter the seals became thinner as the stores of blubber decreased rapidly during the breeding season (February/March). A slight increase in dorsal blubber thickness was observed in the short period between lactation and moult (late March–early April), but the stores of blubber decreased further during moult (late April–May) to a mean dorsal blubber thickness of less than 20 mm in mid-June. No significant differences were observed in blubber thickness or condition indices between the sexes in the various periods, except during April when the females were in significantly poorer condition than the males. Harp seals sampled during the seal invasions to North Norwegian coastal waters in February 1988 were in poorer condition than seals captured in the Barents Sea in February 1993. Text Barents Sea Phoca groenlandica Unknown Barents Sea |
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Key words Barents Sea biological charactertistics harp seals. NAFO Sci. Coun. Studies 26 63–70 |
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Key words Barents Sea biological charactertistics harp seals. NAFO Sci. Coun. Studies 26 63–70 Barents Sea Harp Seals Phoca Groenl K. T. Nilssen T. Haug P. E. Grotnes V. Potelov and |
topic_facet |
Key words Barents Sea biological charactertistics harp seals. NAFO Sci. Coun. Studies 26 63–70 |
description |
In the period 1990–94, harp seals, Phoca groenlandica, were sampled for ecological studies in various areas and seasons in the Barents Sea. Data on total body weight, standard body length, axillary and maximum girth, dorsal and ventral blubber thickness were selected from all adult seals (defined as seals with standard body length 150 cm or more) in order to evaluate the seasonal dynamics in condition of the animals. Blubber thickness measurements and condition indices (one including length, weight and dorsal blubber thickness and the other including maximum girth and length) showed the same seasonal patterns. The seals were in poor condition in spring and early summer (May–June), the condition improved during the course of summer, and the animals were in good condition in September and in October when the mean dorsal blubber thickness was approximately 88 mm. The energy stores built up during the summer and autumn were maintained until February, whereafter the seals became thinner as the stores of blubber decreased rapidly during the breeding season (February/March). A slight increase in dorsal blubber thickness was observed in the short period between lactation and moult (late March–early April), but the stores of blubber decreased further during moult (late April–May) to a mean dorsal blubber thickness of less than 20 mm in mid-June. No significant differences were observed in blubber thickness or condition indices between the sexes in the various periods, except during April when the females were in significantly poorer condition than the males. Harp seals sampled during the seal invasions to North Norwegian coastal waters in February 1988 were in poorer condition than seals captured in the Barents Sea in February 1993. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
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Barents Sea Harp Seals Phoca Groenl K. T. Nilssen T. Haug P. E. Grotnes V. Potelov |
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Barents Sea Harp Seals Phoca Groenl K. T. Nilssen T. Haug P. E. Grotnes V. Potelov |
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Barents Sea |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.3502 http://archive.nafo.int/open/studies/s26/nilssen.pdf |
geographic |
Barents Sea |
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Barents Sea |
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Barents Sea Phoca groenlandica |
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Barents Sea Phoca groenlandica |
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http://archive.nafo.int/open/studies/s26/nilssen.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.3502 http://archive.nafo.int/open/studies/s26/nilssen.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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