Energetics of the Adults and Larvae of the Antarctic Krill Euphausia superba

南极磷虾成虫和幼虫的能量学

基本信息

批准号：
9117633
负责人：
Langdon Quetin
金额：
$ 34.12万
依托单位：
University of California-Santa Barbara
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1992
资助国家：
美国
起止时间：
1992-07-01 至 1996-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117633&HistoricalAwards=false
关键词：
Energetics Adults Larvae Antarctic Krill

项目摘要

This research on the energetics of the adults and larvae of the Antarctic krill, Euphausia superba, is focused on quantification of the role of ice biota in winter-over survival of krill larvae. Observed interannual differences in physiological condition of the larvae during the winter could lead to differences in survival of the young-of-the-year, and thus in the strength of any one year class. Processes underlying such differences during early and late winter will be studied. Low food availability in the fall after the summer phytoplankton blooms suggests that larvae in early winter will have experienced several months of near starvation conditions. Without an additional food source such as ice biota in the underside of the sea ice these larvae may not survive the winter. However, larvae under the ice in late winter of a heavy ice year will have had this additional food source, and may be in better physiological condition than the beginning of the winter. Environmental conditions in open water and under ice will be compared and will be sampled to determine their physiological condition. The nutritional contribution of the ice biota to total energy demand of the larvae on two month-long cruises to the Southern Ocean will be quantified. The proposed research will address several significant questions about the winter-over energetics of larval krill, in particular the role of ice biota in winter-over survival and subsequent recruitment.

这项关于南极磷虾（EuphausiaSuperba）成虫和幼虫能量学的研究重点是量化冰生物群在磷虾幼虫越冬生存中的作用。观察到的幼虫在冬季生理状况的年际差异可能会导致当年幼虫的存活率差异，从而导致任何一年级的强度差异。将研究初冬和末冬期间这种差异背后的过程。夏季浮游植物大量繁殖后，秋季的食物供应量较低，这表明初冬的幼虫将经历几个月的近乎饥饿的状况。如果没有额外的食物来源，例如海冰下面的冰生物群，这些幼虫可能无法度过冬天。然而，重冰年冬末冰下的幼虫将拥有这种额外的食物来源，并且可能比冬季初处于更好的生理状况。将比较开放水域和冰下的环境条件，并进行采样以确定其生理状况。在为期两个月的南大洋航行中，冰生物群对幼虫总能量需求的营养贡献将被量化。拟议的研究将解决有关磷虾幼体越冬能量学的几个重要问题，特别是冰生物群在越冬生存和随后的补充中的作用。