Temporal changes of deep-sea mesozooplankton abundance in the temperate NE Atlantic and estimates of the carbon budget
Temporal changes of deep-sea mesozooplankton abundance in the temperate NE Atlantic and estimates of the carbon budget
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DOI：
10.3354/meps179027
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发表时间：
1999-01-01
影响因子：
2.5
通讯作者：
Weikert, H
中科院分区：
文献类型：
--
作者：
Koppelmann, R;Weikert, H
利用1m(2)多重开闭网和环境传感系统(MOCNESS)，于1992年在温带东北大西洋的BIOTRANS(深海底栖边界层生物垂直输送和能量学)研究区(北纬47度，西经20度)获得了春季和夏季浮游动物数量和生物量的全深度垂直剖面。750~1050m表层浮游动物丰度春季高，夏季少，在750~1050m之间没有明显的季节差异。在1050米至2250米之间的上层深海带，非生物波动较小，夏季中浮游动物的生物量和数量都明显高于春季。1989年夏季的样本符合这种模式。甲虫属的甲虫类桡足类是主要的贡献者；大多数主要的浮游动物类群虽然起着辅助作用，但在夏季也显示出在上层深海带显著增加。这一增加可能是由于碎屑物质的大量瞬时输入，这种物质在调查区域的浮游植物春季水华过程中经常发生，可能刺激了深海带繁殖的开始。在水深2250米以下，无法检测到中浮游动物丰度的时间变化。根据ETS(电子传输系统)数据计算的中游动物对代谢碳的需求从春季的1.61mgCm(-2)d(-1)增加到夏季的4.12mgCm(-2)d(-1)。假设春季水华面积为50000 km(2)，夏季中、小型浮游动物呼吸的碳最小估计值为893tCd(-1)，比春季高2.6倍。
Full-depth spring and summer vertical profiles of mesozooplankton numbers and biomass were obtained with a 1 m(2) multiple opening/closing net and environmental sensing system (MOCNESS) from the BIOTRANS (biological vertical transport and energetics in the benthic boundary layer of the deep sea) study area (47 degrees N, 20 degrees W) in the temperate NE Atlantic in 1992. Mesozooplankton abundance was high in spring and less in summer in the upper 750 m. Between 750 and 1050 m differences between these seasons could not be detected. In the upper bathypelagic zone, between 1050 and 2250 m, where abiotic fluctuations are minor, both mesozooplankton biomass and numbers were significantly higher in summer compared to spring. Samples from summer 1989 fitted this pattern. Calanoid copepods of the genus Metridia were the main contributors; most of the major zooplankton groups, though playing a subsidiary role, also showed a significant increase in summer in the upper bathypelagic zone. The increase probably was due to the large transient input of detrital material, which regularly occurred in the course of the phytoplankton spring bloom in the area investigated and may have stimulated the onset of reproduction in the bathypelagic zone. Temporal changes in mesozooplankton abundance could not be detected below 2250 m depth. Metabolic carbon requirements of mesozooplankton, calculated from ETS (electron transport system) data, increased in the bathypelagic zone (1000 to 4250 m) from 1.61 mg C m(-2) d(-1) in spring to 4.12 mg C m(-2) d(-1) in summer. The carbon respired by the bathypelagic micro- and mesozooplankton in summer, based on an assumed spring bloom area of 50 000 km(2), was 893 t C d(-1) as a minimum estimate, which was higher than in spring by a factor of 2.6.