Potential causes for the unequal contribution of picophytoplankton to total biomass and productivity in oligotrophic waters

被引:43
作者
Fernández, E
Marañón, E
Morán, XAG
Serret, P
机构
[1] Univ Vigo, Fac Ciencias, Dept Ecol & Biol Anim, Vigo 36200, Spain
[2] Ctr Oceanog Xixon, Inst Espanol Oceanog, Xixon 33212, Spain
关键词
primary production; size-fractionated chlorophyll; picoplankton; oligotrophic waters; Atlantic Ocean;
D O I
10.3354/meps254101
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Size-fractionated chlorophyll a and primary production measurements during 7 latitudinal cruises (56 stations) in the Atlantic Ocean indicate that in subtropical and tropical regions the relative contribution of large (L) (>2 mum) phytoplankton to total (T) chlorophyll a biomass (B) is smaller (BL:BT ratio = 0.25 +/- 0.01 SE) than their contribution to total primary production (P) (PL:PT ratio = 0.45 +/- 0.02). This implies a lower assimilation number for picoplankton than for larger cells: 1.5 +/- 0.2 and 3.7 +/- 0.3 mg C mg chlorophyll a h(-1), respectively (n = 90). During short-term time-course experiments in subtropical and tropical waters of the North Atlantic, a >50% reduction in the abundance of picoplankton, mainly Prochlorococcus spp., took place as early as the first 2 h of incubation. This suggests that long incubation times in bottle experiments can lead to underestimations of primary production rates, at least in oligotrophic waters. The phytoplankton size-structure remained fairly constant throughout the experiments, suggesting that the high PL:PT ratios in these environments cannot be due to enhanced loss rates of small-sized phytoplankton as a result of bottle enclosure. Our results indicate that the observed disagreement between BL:BT and PL:PT ratios is not necessarily an experimental artifact, but could be related to a higher light utilization efficiency of larger phytoplankton.
引用
收藏
页码:101 / 109
页数:9
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