Annual cycle of zooplankton abundance, biomass and production on the northern Gulf of Alaska shelf, October 1997 through October 2000
Annual cycle of zooplankton abundance, biomass and production on the northern Gulf of Alaska shelf, October 1997 through October 2000
复制标题
DOI：
10.1046/j.1365-2419.2003.00256.x
复制
发表时间：
2003-09-01
影响因子：
2.6
通讯作者：
Pinchuk, AI
中科院分区：
文献类型：
--
作者：
Coyle, KO;Pinchuk, AI
浮游动物丰度从3月到10月的北方阿拉斯加湾陆架在1998年，1999年和2000年占主导地位的哲水蚤桡足类，生物量占主导地位的哲水蚤和刺胞动物。虽然我们在1997 - 1998年厄尔尼诺采样，显着的年际差异，主要桡足类类群没有观察到。浮游动物丰度和物种组成的影响主要是由平均水柱盐度，其次是由温跃层以上的平均温度。年生物量高峰出现在5月，平均湿重约为0.5 g/m3，主要由大洋桡足类新哲水蚤（Neocalanus cristatus）、新哲水蚤（Neocalanus plumchrus）和新哲水蚤（Neocalanus flemingeri）组成。第二个生物量高峰，0.5克湿重m）3，观察到在8月，主要由刺胞动物Aequorea spp。桡足类的生产，估计从每日的增长率，使用温度-身体大小回归，在5月达到高峰，约35毫克厘米（-2）天（-1）。初步计算表明，桡足类的年产量约为6 g C m（-2）年（-1），可能不到年初级生产量的10%。阿拉斯加陆架北方湾浮游动物组合对1997 - 1998年ENSO的明显恢复力可能是因为其与加州海流和北太平洋亚北极环流中浮游动物群落之间的动物群边界存在较大的地理分离。
Zooplankton abundance from March through October on the northern Gulf of Alaska shelf in 1998, 1999 and 2000 was dominated by calanoid copepods; the biomass was dominated by calanoids and cnidarians. Although we sampled during the 1997 - 1998 El Nino, marked interannual differences in the major copepod taxa were not observed. Zooplankton abundance and species composition were influenced primarily by mean water-column salinity, secondarily by the mean temperature above the thermocline. An annual biomass peak, averaging about 0.5 g wet weight m) 3, occurred in May and consisted primarily of the oceanic copepod species Neocalanus cristatus, Neocalanus plumchrus and Neocalanus flemingeri. A second biomass peak, 0.5 g wet weight m) 3, was observed in August and consisted mainly of the cnidarian Aequorea spp. Copepod production, estimated from daily growth rates using temperature - body size regressions, peaked in May at about 35 mg C m(-2) day(-1). Initial calculations suggest an annual copepod production on the order of 6 g C m(-2) year(-1), probably less than 10% of the annual primary production. The apparent resilience of the zooplankton assemblage on the northern Gulf of Alaska shelf to the 1997 - 1998 ENSO may have been because of its large geographic separation from the faunal boundary between zooplankton communities in the California Current and North Pacific subarctic gyre.