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首页> 外文期刊>Marine ecology progress series >Seasonality of phytoplankton cell size and the relation between photosynthesis and respiration in the Ria de Vigo (NW Spain)
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Seasonality of phytoplankton cell size and the relation between photosynthesis and respiration in the Ria de Vigo (NW Spain)

机译：浮游植物细胞大小的季节性以及RIA de Vigo（NW Spain）的光合作用与呼吸的关系

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摘要

The Ria de Vigo is a dynamic and productive upwelling ecosystem. We measured C-14 incorporation ((TOCP)-C-14) and gross primary production (GPP), community respiration (DCR), net production (NCP) and size-fractioned chlorophyll a (chl a) fortnightly from May 2012 to May 2013 in the euphotic layer of the Ria. Our aim was to improve the depiction of plankton metabolism in the Ria and to test the general hypothesis that community structure determines the degree of heterotrophy in planktonic ecosystems. Higher primary production was measured after upwelling episodes and during the spring bloom, when the community was dominated by microphytoplankton ( 70% chl a(20 mu m)). Lower primary production was observed during summer stratification periods (similar to 65% chl a(20 mu m)), and during the pico- and nanophytoplankton-dominated winter (similar to 25% chl a(20 mu m)). Coupling between phytoplankton photosynthesis and biomass varied seasonally, mainly driven by environmental conditions. DCR was 3 times lower and 8 times less variable than GPP, and its variability was mainly driven by the changes in chl a. The integrated metabolic balance was autotrophic most of the year, despite the negative NCP rates at depth. There was an inverse relationship between the DCR:GPP ratio and the percentage of microphytoplankton (% chl a(20 mu m)) only in the summer. However, DCR:GPP and DCR:chl a ratios were similar in winter and spring, despite the seasonal differences in primary production and size structure. The similar (TOCP)-C-14: NCP and chl a:DCR relations in spring ( 70% chl a(20 mu m)) and winter (similar to 25% chl a(20 mu m)), and the differences in summer ( 70% chl a(20 mu m)) confirm cell size independence in trophic functioning. We conclude that respiration variability is relevant for the metabolic balance in the Ria, and that the degree of heterotrophy is not systematically related to phytoplankton size over the scales of our study.
机译：RIA de Vigo是一种充满活力和富有成效的上升生态系统。从2012年5月到5月，我们测量了C-14掺入（（TOCP）-C-14）和总初级生产（GPP），群体呼吸（DCR），净生产（NCP）和大小分数的叶绿素A（CHL A） 2013年在RIA的euphotic层。我们的目的是改善RIA中浮游生物的描述，并测试群落结构决定浮游生态系统中异常程度的一般假设。在春季发作后测量较高的初级产量，并且在春季绽放期间，当群落由脑脊液统治（＆ 70％chl a（＆ 20 mu m））。在夏季分层期间观察到较低的初级生产（类似于65％CHL A（＆20μm）），并且在微微和纳米薄膜 - 主导的冬季（类似于25％CHL A（＆ 20 mu m）） 。浮游植物光合作用与生物质之间的偶联，季节性变化，主要由环境条件驱动。 DCR比GPP降低了3倍，可变的8倍，其可变性主要由CHL A的变化驱动。尽管深度的NCP率负面，但整个年份的综合代谢平衡是自身营养的。在夏季，DCR：GPP比率与Microphytoplankton（％CHL A（＆20μm）的百分比之间存在反比关系。然而，尽管初级生产和尺寸结构的季节性差异，DCR：GPP和DCR：CHL在冬季和春季相似。类似的（TOCP）-C-14：NCP和CHL A：Spring（＆ 70％CHL A（＆20μm））和冬季（类似于25％CHL A（＆ 20 mu m） ）和夏季的差异（＆ 70％chl a（＆ 20 mu m））确认细胞尺寸独立在营养功能中的独立性。我们得出结论，呼吸变异性与RIA中的代谢平衡相关，并且异营养素的程度与我们研究尺度的浮游植物大小无关。

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