Seasonality in surface-layer net zooplankton communities in Prince William Sound, Alaska
Seasonality in surface-layer net zooplankton communities in Prince William Sound, Alaska
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DOI：
10.1046/j.1054-6006.2001.00037.x
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发表时间：
2001-01-01
影响因子：
2.6
通讯作者：
Stark, C
中科院分区：
文献类型：
--
作者：
Cooney, RT;Coyle, KO;Stark, C
阿拉斯加威廉王子湾上层网浮游动物群落具有很强的季节性。在2月，上层50米的栖息地和湿重生物量下降到不到100个个体和10 mg m（-3），然后在6月反弹到5000个个体和600 mg m（-3）。桡足类在所有月份都占主导地位，但在春末、夏季和秋季，其他突出的类群，特别是翼足类和幼虫类也会增加。小型桡足类Pseudocalanus，Acartia和Oithona是常见的。虽然数量少得多，但较大的哲水蚤如新哲水蚤、哲水蚤和中哲水蚤在春季和初夏对生物量有很大的贡献。像藤壶无节幼体这样的小型浮游生物有时也非常丰富。5月下旬至6月上旬，当第5期桡足类（C5）离开水面进入深水时，新哲水蚤、哲水蚤和拟哲水蚤都表现出个体发育的种群垂直位移。这种季节性对威廉王子湾支持幼粉鲑鱼（Oncorhynchus gorbuscha）和太平洋鲱鱼（Clupea pallasi）的食物网有影响。
The upper-layer net-zooplankton community in Prince William Sound, Alaska, is characterized by strong seasonality. Abundance and wet-weight biomass in the upper 50 m drop to fewer than 100 individuals and 10 mg m(-3) in February before rebounding to 5000 individuals and 600 mg m(-3) in June. Copepods dominate in all months, but are augmented by other prominent taxa, particularly pteropods and larvaceans during the late spring, summer and fall. The small copepods Pseudocalanus, Acartia and Oithona are common. Though much less abundant, larger calanoids like Neocalanus, Calanus and Metridia contribute substantially to the biomass in spring and early summer. Meroplankters like barnacle nauplii are also occasionally very abundant. Neocalanus, Calanus and Pseudocalanus all exhibit ontogenetic vertical displacement of populations when stage 5 copepodites (C5) leave the surface in late May and early June for deep water. This seasonality has implications for food-webs supporting juvenile pink salmon (Oncorhynchus gorbuscha) and Pacific herring (Clupea pallasi) in Prince William Sound.