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首页> 外文期刊>Marine ecology >Reproductive resilience of ice-dependent Antarctic silverfish in a rapidly changing system along the Western Antarctic Peninsula
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Reproductive resilience of ice-dependent Antarctic silverfish in a rapidly changing system along the Western Antarctic Peninsula

机译：依赖冰的南极银鱼在南极西部半岛快速变化的系统中的生殖适应力

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摘要

The Western Antarctic Peninsula (wAP) is globally one of the systems most heavily impacted by climate change, notably steep declines in sea ice extent. In forage species, reproductive resilience to change is particularly important because population fluctuations are rapidly communicated through the system via trophic interactions. The reproductive traits of the ice-dependent forage species Antarctic silverfish (Pleuragramma antarctica) from different areas along the wAP and at the tip of the Antarctic Peninsula were investigated through macroscopic and histological analyses of gonads, with the aim to assess its reproductive potential and to test for spatial differences in fecundity and spawning season. Fish samples were collected in late summer off Charcot Island, in Marguerite Bay and off Joinville Island; no fish were caught in the central wAP. Samples from Charcot Island and Marguerite Bay consisted of adults in developing gonad stage, whereas those from Joinville consisted almost exclusively of juveniles. Mean GSI was relatively low (2-3%) and similar in both sexes, as specimens were still far from being actively reproducing. Developing females exhibited two discrete, though partially overlapping modes of oocytes of different size, with vitellogenic oocytes measuring 0.5-1.0mm. Absolute and relative fecundity ranged between 3000 and 12,000 eggs per female and between 80 and 190eggsg(-1), with a strong relationship between absolute fecundity and body size. These results were consistent with a single population at Charcot Island and Marguerite Bay and indicated substantial reproductive potential, which may mitigate population isolation and reductions in habitat availability but cannot ultimately offset catastrophic loss of spawning habitat linked to sea-ice retreat.
机译：西方南极半岛（wAP）是全球受气候变化影响最严重的系统之一，尤其是海冰范围急剧下降。在饲草物种中，繁殖的变化适应力尤为重要，因为种群波动通过营养相互作用迅速通过系统传达。通过性腺的宏观和组织学分析，研究了沿wAP和南极半岛尖端不同地区的依赖冰的牧草物种南极银鱼（Pleuragramma antarctica）的繁殖特征，目的是评估其生殖潜能并测试繁殖力和产卵季节的空间差异。夏末在Charcot岛，Marguerite湾和Joinville岛附近收集了鱼类样品。中央水域行动计划没有捕获任何鱼类。查科特岛和玛格丽特湾的样本包括处于性腺发育阶段的成年动物，而乔恩维尔的样本几乎仅包括少年。平均GSI相对较低（2-3％），两性均相似，因为标本尚不能活跃繁殖。发育中的雌性表现出两种离散的，尽管部分重叠的不同大小的卵母细胞模式，卵黄母卵母细胞大小为0.5-1.0mm。绝对繁殖力和相对繁殖力的范围为每只雌性3000至12,000个卵，以及80至190eggsg（-1）之间，绝对繁殖力与体型之间有很强的关系。这些结果与夏科特岛和玛格丽特湾的单个种群相符，并显示出巨大的繁殖潜力，这可能减轻种群隔离并减少生境的可用性，但最终不能抵消与海冰撤退有关的产卵生境的灾难性损失。

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