Year-to-year changes of the mesozooplankton community in the Chukchi Sea during summers of 1991, 1992 and 2007, 2008
Year-to-year changes of the mesozooplankton community in the Chukchi Sea during summers of 1991, 1992 and 2007, 2008
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DOI：
10.1007/s00300-011-0988-z
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发表时间：
2011-03
期刊：
影响因子：
1.7
通讯作者：
K. Matsuno;A. Yamaguchi;T. Hirawake;I. Imai
中科院分区：
文献类型：
--
作者：
K. Matsuno;A. Yamaguchi;T. Hirawake;I. Imai
最近北冰洋西部的海冰面积在夏季急剧减少，但关于其对浮游动物群落的影响的信息却很少。为了评价海冰减少对浮游动物的影响，我们研究了1991年、1992年(海冰扩大时)、2007年和2008年(海冰减少时)楚科奇海浮游动物群落结构的年际变化。浮游动物的数量在4000到316,000个之间。M−2(平均值：70,000)，2008年位于里斯本半岛以北。浮游动物生物量在0.07到286g湿质量m−2(平均值：36)之间，2007年在里斯本半岛以南较大。基于浮游动物丰度的聚类分析表明，浮游动物群落分为四个组。各群的发生在地理上和年际上是分开的，1991年和1992年各群的地理分布相似，但2007和2008年各群的地理分布有所北移。2007/2008年的丰度和生物量高于1991/1992年，这表明进一步减少海冰将对浮游动物的生产产生积极影响(例如，大型太平洋物种的入侵和温度对其生长速度的影响)。2007/2008年浮游动物群落地理分布的北移表明，海冰减少将对楚科奇海部分海域的浮游动物群落(北极特有物种的丧失)产生不利影响。海冰减少对浮游动物群落的这些明显相互矛盾的影响强调了在这一领域继续监测的迫切需要。
A recent drastic decrease in sea ice cover area was observed in the western Arctic Ocean during summer, yet little information is available for its effect on zooplankton community. To evaluate the effect of sea ice reduction on zooplankton, we studied year-to-year changes of zooplankton community structure in the Chukchi Sea during summers of 1991, 1992 (when sea ice extended), 2007, and 2008 (when sea ice reduced). Zooplankton abundance ranged from 4,000 to 316,000 ind. m−2(mean: 70,000) and was greater north of Lisburne Peninsula in 2008. Zooplankton biomass ranged from 0.07 to 286 g wet mass m−2(mean: 36) and was greater south of Lisburne Peninsula in 2007. Cluster analysis based on zooplankton abundance showed a division of the zooplankton community into four groups. Occurrence of each group was separated geographically and interannually, and geographic distributions of each group in 1991 and 1992 were similar but those in 2007 and 2008 were shifted northward. Abundance and biomass in 2007/2008 were higher than in 1991/1992, indicating that further sea ice reduction would have a positive effect on zooplankton production (e.g. invasion of large Pacific species and temperature effects on their growth rate). The northern shift in geographic distribution of the zooplankton community in 2007/2008 indicates that sea ice reduction would have a negative effect on the zooplankton community (loss of characteristic Arctic species) in part of the Chukchi Sea. These apparently contradictory effects of sea ice reduction on zooplankton community emphasize the critical need for continued monitoring in this area.