Phytoplankton production and grazing balances in the Costa Rica Dome.
Phytoplankton production and grazing balances in the Costa Rica Dome.
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哥斯达黎加穹顶的浮游植物生产和放牧平衡。
DOI：
10.1093/plankt/fbv089
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发表时间：
2016
影响因子：
2.1
通讯作者：
A. Pasulka
中科院分区：
文献类型：
--
作者：
M. Landry;K. Selph;M. Décima;A. Gutiérrez‐Rodríguez;M. Stukel;Andrew G. Taylor;A. Pasulka
我们调查了2010年夏季哥斯达黎加穹顶(CRD)浮游植物的生产量和放牧命运，其基础是通过流式细胞仪和色素分析的稀释深度剖面以及通过肠道荧光评估的中游动物放牧。从14C吸收(1025±113mgCm-2day-1)、总ChLA稀释实验(990±106mgCm-2day-1)和流式细胞仪种群(862±71mgCm-2day-1)分析的三个群落生产量估计值，超过了区域船基值的2-3倍。浮游植物占群落生物量的56%，占生产量的39%。原氯球菌(PRO)和微真核生物的产量范围比聚球藻(SYN)和较大的真核生物延伸得更深，但93%的总产量发生在40米以上。微型浮游动物消耗了所有PRO和SYN的增长和总产量的三分之二。在海拔40米以上的大型真核生物的正净增长被中游动物独立测量的消耗量所平衡。在较大的真核生物中，硅藻对产量的贡献为∼3%。根据这一分析，CRD区域的特点是产量和放牧周转率高，与赤道东太平洋的估计数相当或更高。尽管如此，该地区仍表现出高生产力的非典型特征，例如微藻占主导地位，硅藻作用受到抑制。
We investigated phytoplankton production rates and grazing fates in the Costa Rica Dome (CRD) during summer 2010 based on dilution depth profiles analyzed by flow cytometry and pigments and mesozooplankton grazing assessed by gut fluorescence. Three community production estimates, from 14C uptake (1025 ± 113 mg C m-2 day-1) and from dilution experiments analyzed for total Chla (990 ± 106 mg C m-2 day-1) and flow cytometry populations (862 ± 71 mg C m-2 day-1), exceeded regional ship-based values by 2-3-fold. Picophytoplankton accounted for 56% of community biomass and 39% of production. Production profiles extended deeper for Prochlorococcus (PRO) and picoeukaryotes than for Synechococcus (SYN) and larger eukaryotes, but 93% of total production occurred above 40 m. Microzooplankton consumed all PRO and SYN growth and two-third of total production. Positive net growth of larger eukaryotes in the upper 40 m was balanced by independently measured consumption by mesozooplankton. Among larger eukaryotes, diatoms contributed ∼3% to production. On the basis of this analysis, the CRD region is characterized by high production and grazing turnover, comparable with or higher than estimates for the eastern equatorial Pacific. The region nonetheless displays characteristics atypical of high productivity, such as picophytoplankton dominance and suppressed diatom roles.