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Environmental variability and its impact on the reproductive cycle ofAntarctic krill

机译：环境变化及其对南极磷虾繁殖周期的影响

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摘要

"Recruitment potential" in Antarctic krill in the Palmer Long-Term Ecological Research (LTER) study region west of the Antarctic Peninsula varied significantly over the 7-yr time series between January 1993 and January 1999. Timing of ovarian maturation, the percent of the population reproducing, and individual reproductive output (batch volume, embryo diameter) were measured. Indices have been developed to quantify the timing and intensity of reproduction in Antarctic krill. One finding important to estimates of population fecundity for this long-lived species is that the percent of the population reproducing can vary widely, from 10 to 98%. Each season was characterized as having delayed, average or advanced ovarian development. In this study we relate these indices to direct and indirect indicators of spring or annual food availability. The timing of the spring sea ice retreat and the extent of sea ice in the spring (September through November) appear to significantly affect the intensity and timing of reproduction in the population. Intensity of reproduction was highest under "average" conditions, and oocyte development fastest with conditions of a late retreat and high spring sea ice extent.
机译：在1993年1月至1999年1月的7年时间序列中，南极半岛以西的Palmer长期生态研究（LTER）研究区域中南极磷虾的“招聘潜力”发生了显着变化。测量种群繁殖和个体繁殖产量（批量，胚胎直径）。已经开发出指标来量化南极磷虾繁殖的时间和强度。一个重要的发现对于估计这种长寿物种的种群繁殖力很重要，那就是繁殖种群的百分比差异很大，从10％到98％不等。每个季节的特征是卵巢发育延迟，平均或晚期。在这项研究中，我们将这些指数与春季或年度粮食供应量的直接和间接指标相关联。春季海冰撤退的时间和春季（9月至11月）海冰的程度似乎对种群的繁殖强度和繁殖时间产生重大影响。在“平均”条件下，繁殖强度最高，在后期撤退和春季海冰程度较高的条件下，卵母细胞发育最快。

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