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The concentrations and the fatty acid compositions (weight percent) of three plasma lipid fractions (phospholipids, cholesteryl
esters, and triacylglycerols) were examined in five Weddell seal pups through suckling, the post-weaning fast and periods
of independent foraging. The principal plasma fatty acids in Weddell seal pups during suckling were the same as those previously
reported for milk samples collected from lactating Weddell seals. In contrast to the stable milk fatty acid composition suggested
by the previous study, significant changes in the fatty acid composition of plasma lipids occurred during suckling. These
included an increase in the weight% of 20:4(n-6) and 18:0 in phospholipids, an increase of 20:4(n-6) in cholesteryl esters,
and an increase of 20:1(n-9) and a decrease of 20:5(n-3) in triacylglycerols. Weaning and the subsequent fasting period were
accompanied by a dramatic drop in the plasma concentration and 14:0 content of triacylglycerols and by marked decrease and
increase in the weight% of 20:1(n-9) and 20:5(n-3), respectively, in this lipid fraction. Weight% of 14:0 in triacylglycerols
and/or plasma concentration of triacylglycerols clearly distinguish post-weaning from suckling. However, fasting versus foraging
pups could not be clearly distinguished.
Received: 7 October 1996 / Accepted: 20 May 1997 相似文献
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Birte Mueller Ulrich Pörschmann Jochen B. W. Wolf Fritz Trillmich 《Marine Mammal Science》2011,27(2):350-365
Development implies a change in allocation of resources from somatic growth to reproduction. In a highly variable environment, growth can vary from year to year thereby influencing the long‐term life history perspective. The Galapagos sea lion (Zalophus wollebaeki) lives in a highly unpredictable marine environment in which food abundance varies not only seasonally, but also annually due to El Niño. Galapagos sea lions are restricted to a patch of cold upwelling waters surrounding the archipelago and are closely tied to land as nursing females alternate between foraging at sea and nursing ashore. Therefore, their offspring are especially vulnerable to ocean warming causing reduced food abundance. We found a significant correlation between sea surface temperature (SST) and early growth: Both mass at birth and linear growth within the first 2 mo of life correlated negatively with SST. Absolute mass gain was higher for males, but both sexes gained equally 1.9% of birth mass per day. Until the age of 3 yr male and female juveniles showed similar growth to an asymptotic mass of 40 and 35 kg, respectively. As a consequence of the highly variable environment, the plasticity in growth strategy of Galapagos sea lion juveniles appears wider than that of all other sea lions allowing them to cope with poor conditions. 相似文献
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