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首页> 外文期刊>ICES Journal of Marine Science >A comparative study of Calanus finmarchicus mortality patterns at five localities in the North Atlantic
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A comparative study of Calanus finmarchicus mortality patterns at five localities in the North Atlantic

机译：在北大西洋五个地区的finmarchicus龟的死亡模式的比较研究

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摘要

We compare the patterns of stage-specific mortality of Calanus finmarchicus at five localities across the North Atlantic Ocean during the spring-summer period of active population growth: Georges Bank, a continental shelf locality in the NW Atlantic, based on 30 broadscale survey cruises in the US GLOBEC program; the northern North Sea, studied during the historic FLEX program with sampling four times daily for 73 days; Ocean Station M in the central Norwegian Sea, based on an 80-day daily time-series; and Lurefjorden (sampled weekly in late winter-early summer) and Sorfjorden (sampled monthly), two fjords in southwestern Norway characterized by markedly different guilds of predators. The mortality estimation methods included Wood's Population Surface Method, the Vertical Life Table (VLT) method, and a modified VLT, according to the study site and copepod recruitment schedules. Contrary to assumptions implicit in many simulation models and indirect methods for estimating zooplankton mortality, both rates and stage-specific patterns of mortality of C. finmarchicus vary appreciably across the North Atlantic. Characteristics of local environments, including the predator field in particular, appear to strongly influence mortality schedules in different regions. In at least two sites (Georges Bank and Ocean Station M), mortality rates of early stages of C. finmarchicus are density-dependent. We attribute this density-dependent mortality to egg cannibalism, which introduces non-linear population responses to changing environmental conditions. Region-specific biological interactions can substantially modify the effects of physical climate variability and render simple linear relationships between climate and zooplankton abundance unlikely.
机译：我们比较了在活跃人口增长的春夏季期间，北大西洋五个地区的finmarchicus阶段阶段死亡率的模式：Georges Bank，一个位于西北大西洋的大陆架地区，基于30个大规模调查航次美国GLOBEC计划；北海北部，在历史悠久的FLEX计划中进行了研究，每天进行四次采样，共73天；挪威中部海洋站M，以每天80天的时间序列为依据；挪威西南部的两个峡湾，以掠食者行会的特征截然不同为特色；还有Lurefjorden（在冬季后期至夏季初，每周一次抽样）和Sorfjorden（每月抽样）。根据研究地点和co足类的招募时间表，死亡率估算方法包括伍德氏种群表面法，垂直生命表（VLT）方法和改进的VLT。与许多模拟模型和间接方法来估算浮游动物死亡率所隐含的假设相反，整个北大西洋，finmarchicus线虫的死亡率和特定阶段的死亡率模式都有很大的不同。当地环境的特征，特别是掠食者的田地，似乎强烈影响着不同地区的死亡率计划。在至少两个地点（乔治银行和海洋站M），finmarchicus早期阶段的死亡率与密度有关。我们将这种与密度相关的死亡率归因于鸡蛋食人症，该原因导致人们对环境条件的变化产生了非线性的种群反应。特定区域的生物相互作用可以大大改变物理气候变化的影响，并使气候和浮游动物丰度之间的简单线性关系变得不可能。

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