Pelagic food-webs in a changing Arctic: a trait-based perspective suggests a mode of resilience
Pelagic food-webs in a changing Arctic: a trait-based perspective suggests a mode of resilience
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不断变化的北极的中上层食物网：基于特征的视角表明了一种恢复力模式
DOI：
10.1093/icesjms/fsy063
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发表时间：
2018
影响因子：
3.3
通讯作者：
Renaud P
中科院分区：
文献类型：
--
作者：
Renaud P
北极海洋生态系统支持着具有重要且日益增长的经济和营养价值的渔业。商业种群是由远洋食物网维持的，相对较少的关键分类群介导能量向更高营养水平的转移，但这些分类群将如何受到气候变化和北方分类群涌入的影响，在很大程度上仍然是未知的。Calanusspecies储存大量的脂质，使这些浮游动物成为海洋食物网的关键一环。北极鳕鱼通常体型较大，重要的是，与北方的同类相比，它们含有不成比例的更多的脂质储存。据预测，持续的气候变暖和随后的初级生产制度的变化将导致从较大的、富含脂质的北极物种——冰川Calanus glacialisand hyperboreus——向较小的、位于欧洲北极的北方Calanus finmarchicuss转变，对顶级捕食者产生负面影响。我们的数据表明，这三个物种的脂肪含量与体型密切相关，即不是物种特有的特征，并且在体型上有相当大的重叠。finmarchicusandC。glacialis。一个基于性状的生活史模型被用来检验一个理想化的情景，在一个变化的北极，初级生产周期更长，C。glacialis——并且,着类桡足动物确实被c代替了。类似于finmarchicus的个体，无论是通过竞争、可塑性、杂交还是进化。然而，该模型发现，在未来的情况下，能量从初级生产者转移到高级捕食者实际上可能更有效，因为随着体型的变化，世代长度和种群周转率也会发生变化。这些发现表明，北极海洋食物网可能比之前假设的更能适应与气候相关的气候变化。
Arctic marine ecosystems support fisheries of significant and increasing economic and nutritional value. Commercial stocks are sustained by pelagic food webs with relatively few keystone taxa mediating energy transfer to higher trophic levels, and it remains largely unknown how these taxa will be affected by changing climate and the influx of boreal taxa.Calanusspecies store large quantities of lipids, making these zooplankton a critical link in marine food-webs. The ArcticCalanusspecies are usually larger and, importantly, have been suggested to contain disproportionately larger lipid stores than their boreal congeners. Continued climate warming and subsequent changes in primary production regimes have been predicted to lead to a shift from the larger, lipid-rich Arctic species,Calanus glacialisandCalanus hyperboreus, toward the smaller, borealCalanus finmarchicusin the European Arctic, with negative consequences for top predators. Our data show that lipid content is closely related to body size for all three species, i.e. is not a species-specific trait, and that there is considerable overlap in size betweenC. finmarchicusandC. glacialis. A trait-based life-history model was used to examine an idealized scenario where, in a changed Arctic with a longer period of primary production,C. glacialis- andC. hyperboreus-like copepods are indeed replaced byC. finmarchicus-like individuals, whether through competition, plasticity, hybridization, or evolution. However, the model finds that transfer of energy from primary producers to higher predators may actually bemoreefficient in this future scenario, because of the changes in generation length and population turnover rate that accompany the body-size shifts. These findings suggest that Arctic marine food webs may be more resilient to climate-related shifts in theCalanuscomplex than previously assumed.
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影响因子：
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作者：
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发表时间：
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期刊：
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影响因子：
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作者：
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