...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Seasonal ecology and life-history strategy of the high-latitude predatory zooplankter Parasagitta elegans
【24h】

Seasonal ecology and life-history strategy of the high-latitude predatory zooplankter Parasagitta elegans

机译：高纬度捕食浮游动物线虫的季节性生态学和生活史策略

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

ABSTRACT: Organisms residing in seasonal environments schedule their activities to annual cycles in prey availability and predation risk. These cycles may be particularly pronounced in pelagic ecosystems of the high-Arctic, where the seasonality in irradiance, and thus primary production, is strong. Here we report on the seasonal ecology and life strategy of a predatory planktivore in a high-Arctic fjord (Billefjorden, Svalbard ~78°N). We studied the chaetognath Parasagitta elegans (var. arctica), an abundant zooplankter of high-latitude seas, focusing on its age structure, seasonal vertical distribution, growth and timing of reproduction. The body-length data (range: 2 to 44 mm) revealed the presence of 3 size cohorts (Cohorts 0, 1 and 2), suggesting a 3 yr life span. Spring and early summer (May/June) was the main spawning season, as revealed by inspection of gonads and the presence of well-developed seminal receptacles prior to high numbers of newborns. Both Cohorts 1 and 2 reproduced, with male gonads maturing first in this hermaphrodite. Growth rates for all cohorts were highest in spring and early summer, and at this time of the year, the youngest year class (Cohort 0) was distributed near the surface where their feeding opportunities may peak. In winter, however, all cohorts were in deeper waters, suggesting seasonal migrations, possibly to follow the distributions of overwintering copepods. Scheduling of growth, maturation and reproduction in Arctic zooplankton populations is important baseline information for predictions of zooplankton responses to environmental change, particularly those associated with timing and phenology, pinpointing the need for more high-resolution studies on zooplankton annual routines.
机译：摘要：居住在季节性环境中的生物将活动安排在年度周期内，以获取猎物和捕食风险。在北极地区的远洋生态系统中，这些周期尤其明显，那里辐照度的季节性很强，因此初级生产也很强。在这里，我们报告了高北极峡湾（比勒峡湾，斯瓦尔巴特群岛〜78°N）中掠食性浮游动物的季节性生态和生活策略。我们研究了Chaetognath Parasagitta elegans （变种 arctica ），这是一种高纬度海洋丰富的浮游动物，着眼于其年龄结构，季节性垂直分布，生长和繁殖时机。体长数据（范围：2到44 mm）显示存在3个大小队列（队列0、1和2），表明寿命为3年。春季和初夏（5月/ 6月）是主要的产卵季节，根据对性腺的检查以及在大量新生儿出生之前存在发育良好的精囊的发现。第一组和第二组都进行了繁殖，雄性腺在该雌雄同体中先成熟。所有队列的增长率在春季和初夏最高，并且在每年的这个时候，最年轻的一年级（队列0）分布在他们的进食机会可能达到顶峰的地表附近。然而，在冬季，所有队列均在较深的水域中，这表明季节性迁徙，可能跟随越冬co足类的分布。北极浮游动物种群的生长，成熟和繁殖计划对于预测浮游动物对环境变化的响应，特别是与时间和物候相关的响应，是重要的基线信息，指出了对浮游动物年度例行性进行更高分辨率研究的必要性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号