PATTERNS OF LIPID-CONTENT AND STRATIFICATION IN THE BLUBBER OF FIN WHALES (BALAENOPTERA-PHYSALUS)
PATTERNS OF LIPID-CONTENT AND STRATIFICATION IN THE BLUBBER OF FIN WHALES (BALAENOPTERA-PHYSALUS)
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DOI：
10.2307/1381793
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发表时间：
1990-11-01
影响因子：
1.7
通讯作者：
BORRELL, A
中科院分区：
文献类型：
--
作者：
AGUILAR, A;BORRELL, A
本文研究了82头在西班牙外海捕获的长须鲸鲸脂的脂质含量和分层结构与个体生物学特性的关系。外部鲸脂层的脂质含量是稳定的，没有表现出明显的变化与年龄，生殖状态，或在任何性别的捕获日。这表明这一层在长须鲸的脂肪储存动态中并不起重要作用。相反，内部层是可变的，清楚地反映了个体的营养储备。中层是外部和内部层之间的过渡。生殖类别最好区分的三个层的值的平均值比任何一个独立使用。出于这个原因，这个平均值被提议作为长须鲸状况的最佳指数。繁殖状况是决定雌性鲸脂脂肪含量变化的主要因素，但对雄性鲸脂没有意义。生殖类别的鲸脂脂肪含量排序为：怀孕雌性>雄性=未成熟雌性>休息雌性>哺乳雌性。这些差异是由不同种群成分的能量、迁移和生理特征所解释的。在男性，脂肪含量随年龄的增长显着下降，而在未成熟的女性，它随年龄的增长。在两种性别中，脂肪储备从5月初至8月中旬，但往往减少之后，在食物供应的变化。哺乳期雌性的营养状况在哺乳后期有所改善，这可能是因为哺乳期幼仔的摄食量增加，能量需求减少。
The lipid content and layering structure of the blubber of 82 fin whales (Balaenoptera physalus) caught off Spain were studied in relation to individual biological attributes. The lipid content of the external blubber stratum is stable and shows no apparent variation with age, reproductive status, or day of capture in either sex. This indicates that this stratum does not play a significant role in the dynamics of fat storage in fin whales. The internal stratum, in contrast, is variable, clearly reflecting the nutritive reserves of individuals. The mid-stratum is a transition between the external and internal layers. Reproductive categories are discriminated best by the mean of the values of the three layers than by any of them used independently. For this reason, this mean is proposed as the best index of condition for fin whales. Reproductive status is the main factor determining variation in lipid content of blubber in females, but is meaningless in males. Ranking of blubber fatness for the reproductive categories is: pregnant females > males = immature females > resting females > lactating females. These dissimilarities are explained by the energetic, migrational, and physiological characteristics of the different populatgion components. In males, lipid content of blubber decreased significantly with age, whereas in immature females it increased with age. In both sexes, lipid reserves accrued from early May unil mid-August, but tended to decrease afterwards, following variations in food availability. The nutritive condition of lactating females improved during late lactation probably because of increasing food consumption and decreasing energetic demands of suckling young.