Interannual variation in spring biomass and gut content composition of copepods in the Kuroshio current, 1971–89
Interannual variation in spring biomass and gut content composition of copepods in the Kuroshio current, 1971–89
复制标题
黑潮中桡足类春季生物量和肠道内容物组成的年际变化，1971-89
DOI：
10.1046/j.1365-2419.2001.00178.x
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发表时间：
2001
影响因子：
2.6
通讯作者：
Y. Matsukawa
中科院分区：
文献类型：
--
作者：
K. Nakata;S. Koyama;Y. Matsukawa
本文研究了1971 ~ 1989年日本中部太平洋沿岸黑潮和陆坡水早春桡足类生物量和肠内容物组成的年际变化与气候因子的关系。两个沃茨中大型（前体长度≥ 1 mm）和小型（前体长度< 1 mm）桡足类的生物量趋势不同。大型桡足类生物量的峰值在幅度上有所下降，小型桡足类生物量在1980年前后很低。黑潮大型桡足类3年平均生物量与黑潮弯曲指数有关。年平均生物量与肠道硅藻丰度有关，而肠道硅藻丰度又与风速和温度有关。3月份坡面水体大型桡足类生物量的3年平均值与太阳辐射呈正相关。两个沃茨中小型桡足类的生物量与2月份的太阳辐射呈负相关，小型桡足类生物量高的年份不仅与桡足类肠道中较大食物（硅藻和微型食物）丰度高的年份相对应，而且与纳米食物丰度高的年份相对应。我们假设营养供应上层调节黑潮大型桡足类生物量的年际变化。因此，气候影响桡足类的大小组成和生物量在黑潮及其附近的早春。
We examined the effects of climate factors on interannual variations of copepod biomass and gut content composition in early spring in the Kuroshio and the slope water off the Pacific coast of central Japan from 1971 to 1989. The biomass trends were different for large (prosomal length ≥ 1 mm) and small (prosomal length < 1 mm) copepods in both waters. Peaks in biomass of large copepods decreased in magnitude, and the biomass of small copepods was low around 1980. For the large copepods in the Kuroshio, 3-year running mean biomass was related to the Kuroshio meander index. The yearly mean biomass was related to diatom abundance in the gut which, in turn, was related to wind speed and temperature. The 3-year running mean biomass of large copepods in the slope water was positively related to solar radiation in March. The biomass of small copepods in both waters was negatively related to solar radiation in February, and years with high biomass of small copepods corresponded with not only the years with high abundance of larger foods (diatoms and micro-sized foods) in copepod guts, but also with the years with high abundance of the nano-sized foods. We hypothesize that nutrient supply to upper layers regulates interannual variation of biomass of large copepods in the Kuroshio. Thus, climate influences both size composition and biomass of copepods in and near the Kuroshio in early spring.