Pigment adaptations in surface phytoplankton along the eastern boundary of the Atlantic Ocean
Pigment adaptations in surface phytoplankton along the eastern boundary of the Atlantic Ocean
复制标题
大西洋东部边界表面浮游植物的色素适应
DOI：
10.3354/meps281013
复制
发表时间：
2004
影响因子：
2.5
通讯作者：
S. Lavender
中科院分区：
文献类型：
--
作者：
R. Barlow;J. Aiken;G. Moore;P. Holligan;S. Lavender
1998年5月和6月，利用色素和海洋颜色数据描述了大西洋东部边界断面表面浮游植物的特征。划分了五个主要区域，包括非洲西南部和西北部的本格拉和加那利上升流系统、温带东北大西洋、北部少营养环流和南部少营养带。诊断指数被用来评估浮游植物群落的化学分类组成，而光色素指数被用来调查不同地区的色素适应情况。沿样带观察到的叶绿素a浓度范围很大，从0.03到30.6 mg m-3不等。高生产力地区的水平很高，本格拉地区的平均浓度是加那利和温带东北大西洋地区的3倍。低营养区的叶绿素a水平较低，但南部低营养区的浓度是北部的两倍。诊断指数表明，本格拉地区的群落以微型浮游生物为主，东北大西洋温带以微型浮游生物为主，加那利地区存在微型和微型浮游生物的混合群落。两个少营养区的群落以微浮游植物为主。光色素指数表明，样带中叶绿素占总色素的比例变化不大，平均为45%，但辅助色素池变化较大。叶绿素c和光合类胡萝卜素在高生产力地区表现突出，导致光合成色素(叶绿素和类胡萝卜素)占总色素的87%~93%。相比之下，光保护类胡萝卜素的水平较高，导致光合色素含量仅为68%。
Pigment and ocean colour data were used to characterise the phytoplankton at the sur- face along an eastern boundary transect of the Atlantic Ocean in May and June 1998. Five major regions were delineated, including the Benguela and Canary upwelling systems off SW and NW Africa, the temperate NE Atlantic, the northern oligotrophic gyre and a southern oligotrophic zone. Diagnostic indices were derived to assess the chemotaxonomic composition of the phytoplankton community, while photo-pigment indices were derived to investigate pigment adaptations across the regions. A large range in chlorophyll a concentrations was observed along the transect, varying from 0.03 to 30.6 mg m -3 . The levels were high in the high productivity regions, with mean concentrations being 3-fold greater in the Benguela region compared to the Canary and temperate NE Atlantic. Chlorophyll a levels were low in the oligotrophic regions, but concentrations in the southern oligo- trophic region were double those in the northern. Diagnostic indices revealed that microplankton dominated the community in the Benguela region, nanoplankton dominated the temperate NE Atlantic and a mixed community of micro- and nanoplankton were present in the Canary region. Picoplankton comprised the majority of the communities in the 2 oligotrophic regions. Photo-pigment indices indicated that variation in the chlorophyll a proportion of total pigments was small, averaging 45% across the transect, but the accessory pigment pool varied considerably. Chlorophyll c and photosynthetic carotenoids were prominent in the high productivity regions, resulting in photo- synthetic pigments (chlorophylls plus carotenoids) accounting for 87 to 93% of total pigments. In contrast, the level of photoprotective carotenoids was high in oligotrophic regions, resulting in a photosynthetic pigment content of only 68%.