Reproductive traits and population dynamics of benthic invertebrates indicate episodic recruitment patterns across an Arctic polar front.
Reproductive traits and population dynamics of benthic invertebrates indicate episodic recruitment patterns across an Arctic polar front.
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底栖无脊椎动物的繁殖特征和种群动态表明，北极极地锋面的时段性补充模式。
DOI：
10.1002/ece3.7539
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发表时间：
2021-06
影响因子：
2.6
通讯作者：
Grange LJ
中科院分区：
文献类型：
--
作者：
Reed AJ;Godbold JA;Solan M;Grange LJ
气候引起的北极海洋和海冰环境的变化开始给北极生态系统带来重大而快速的变化，但定向强迫对物种持久性和分布的影响仍然知之甚少。在这里，我们研究了与巴伦支海极锋相交的南北横断面中双壳类 Astarte crenata 和海星 Ctenodiscus crecatus 的繁殖特征和种群动态。这两个物种都呈现出较大的卵母细胞，表明短距离远洋或直接发育，其大小频率在纬度 74.5 至 81.3° 之间没有差异。然而，尽管配子成熟，我们发现种群中某些大小类别的频率较低，这可能表明周期性招募失败。我们认为，当条件有利时，A. crenata 的募集可能会定期发生，而 C. 卷曲种群的特点是偶发性募集失败。卷曲卷藻的幽门盲肠指数表明，极地锋线及其以北的食物吸收量最大，这为以下观点提供了证据：初级生产力的数量和质量及其流入海底的年际变化，与海冰的变化范围和厚度有关，可能是生理健康的重要决定因素。我们的研究结果证明，物种的分布和长期生存不仅是对特定环境变化的适应能力的简单函数，而且还取决于环境条件支持繁殖和定居的年份的频率和发生时间。我们利用来自北极高海底层的具有重要功能的海星和双壳类物种，研究了与极锋相交的南北横断面的繁殖和种群动态，结果表明，整个极锋的繁殖特征没有差异。然而，人口动态表明招募可能是间歇性的。我们的分析表明，物种的长期生存能力取决于环境条件支持繁殖和定居的年份。
Climate‐induced changes in the ocean and sea ice environment of the Arctic are beginning to generate major and rapid changes in Arctic ecosystems, but the effects of directional forcing on the persistence and distribution of species remain poorly understood. Here, we examine the reproductive traits and population dynamics of the bivalve Astarte crenata and sea star Ctenodiscus crispatus across a north–south transect that intersects the polar front in the Barents Sea. Both species present large oocytes indicative of short pelagic or direct development that do not differ in size–frequency between 74.5 and 81.3º latitude. However, despite gametogenic maturity, we found low frequencies of certain size classes within populations that may indicate periodic recruitment failure. We suggest that recruitment of A. crenata could occur periodically when conditions are favorable, while populations of C. crispatus are characterized by episodic recruitment failures. Pyloric caeca indices in C. crispatus show that food uptake is greatest at, and north of, the polar front, providing credence to the view that interannual variations in the quantity and quality of primary production and its flux to the seafloor, linked to the variable extent and thickness of sea ice, are likely to be strong determinants of physiological fitness. Our findings provide evidence that the distribution and long‐term survival of species is not only a simple function of adaptive capacity to specific environmental changes, but will also be contingent on the frequency and occurrence of years where environmental conditions support reproduction and settlement. Using functionally important sea star and bivalve species from the high Arctic seafloor, we examine reproduction and population dynamics across a north–south transect intersecting the polar front and show that there is no difference in reproductive traits across the polar front. However, population dynamics suggest recruitment may be episodic. Our analyses reveal that long‐term viability of species is contingent on the occurrence of years where environmental conditions support reproduction and settlement.
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影响因子：
3.6
作者：
Divine, DV;Dick, C
通讯作者：
Dick, C
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作者：
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