HARP SEAL (PHOCA-GROENLANDICA) INVASIONS IN NORWEGIAN COASTAL WATERS - AGE COMPOSITION AND FEEDING-HABITS
HARP SEAL (PHOCA-GROENLANDICA) INVASIONS IN NORWEGIAN COASTAL WATERS - AGE COMPOSITION AND FEEDING-HABITS
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DOI：
10.1093/icesjms/48.3.363
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发表时间：
1991-11-01
影响因子：
3.3
通讯作者：
ASPHOLM, PE
中科院分区：
文献类型：
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作者：
HAUG, T;KROYER, AB;ASPHOLM, PE
自1978年以来，大量格陵兰海豹（Phoca groenlandica）在冬季和春季入侵挪威北部沿海地区。1987年和1988年，海豹入侵的规模和地理范围都急剧增加。1986年和1988年，对挪威刺网渔业中作为副渔获物捕获的格陵兰海豹进行了胃内容物取样，用于食物分析，并对牙齿取样，用于年龄测定。海豹群似乎由未成年和成年动物组成，后者主要是雄性。胃的分析表明，进食是机会性的，各种鱼类（特别是鳕科物种鳕鱼，Saithe，黑线鳕和挪威pout，以及远洋浅滩物种鲱鱼和毛鳞鱼）被视为猎物。虾和鱿鱼也被消费，但数量比鱼少得多。
Since 1978 large numbers of harp seals (Phoca groenlandica) have invaded coastal areas of north Norway in winter and spring. In 1987 and 1988 dramatic increases occurred in both the magnitude and the geographic extent of these seal invasions. Sampling of stomach contents for food analyses and of teeth for age determinations was carried out on harp seals taken as by-catch in Norwegian gillnet fisheries in 1986 and 1988. It appears that the seal herds comprised both immature and mature animals, the latter being mainly males. The stomach analyses suggested that feeding was opportunistic, with a variety of fish (in particular the gadoid species cod, saithe, haddock, and Norway pout, and the pelagic shoaling species herring and capelin) being taken as prey. Prawns and squid were also consumed, but in considerably lower quantities than fish.