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Effects of increases in temperature and nutrients on phytoplankton community structure and photosynthesis in the Western English Channel

机译：温度和养分增加对西英吉利海峡浮游植物群落结构和光合作用的影响

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Anthropogenic climate change is exerting pressures on coastal ecosystems through increases in temperature, precipitation and ocean acidification. Phytoplankton community structure and photo-physiology are therefore adapting to these conditions. Changes in phytoplankton biomass and photosynthesis in relation to temperature and nutrient concentrations were assessed using a 14 year dataset from a coastal station in the Western English Channel (WEC). Dinoflagellate and coccolithophorid biomass exhibited a positive correlation with temperature, reaching the highest biomass at between 15 and 17°C. Diatoms showed a negative correlation with temperature, with highest biomass at 10°C. Chlorophyll a (chl a) normalised light-saturated photosynthetic rates (PBm) exhibited a hyperbolic response to increasing temperature, with an initial linear increase from 8 to 11°C, and reaching a plateau from 12°C. There was however no significant positive correlation between nutrients and phytoplankton biomass or PBm, which reflects the lag time between nutrient input and phytoplankton growth at this coastal site. The major phytoplankton groups that occurred at this site occupied distinct thermal niches, which in turn modified PBm. Increasing temperature, and higher water column stratification, was major factors in the initiation of dinoflagellates blooms at this site. Dinoflagellates blooms during summer also co-varied with silicate concentration, and acted as a tracer of dissolved inorganic nitrogen and phosphate from river run-off, which were subsequently reduced during these blooms. The data implies that increasing temperature and high river runoff during summer, will promote dinoflaglellates blooms in the WEC.
机译：人为的气候变化通过温度升高，降水增加和海洋酸化对沿海生态系统造成压力。因此，浮游植物的群落结构和光生理学正适应这些条件。使用来自西英吉利海峡（WEC）海岸站的14年数据集评估了浮游植物生物量和光合作用相对于温度和养分浓度的变化。鞭毛藻和球鞘藻生物质与温度呈正相关，在15至17°C之间达到最高生物质。硅藻与温度呈负相关，在10°C时生物量最高。叶绿素a（chla）归一化的光饱和光合速率（PBm）对温度升高表现出双曲线响应，初始线性从8升高到11°C，从12°C达到平稳。但是，养分与浮游生物量或PBm之间没有显着的正相关，这反映了该沿海地点养分输入与浮游植物生长之间的滞后时间。发生在该地点的主要浮游植物群占据了独特的热生态位，进而改变了PBm。温度升高和更高的水柱分层是引发该地点鞭毛藻开花的主要因素。夏季鞭毛藻的花期也随硅酸盐浓度而变化，并充当河流径流中溶解的无机氮和磷酸盐的示踪剂，随后在这些花期中被减少。数据表明，夏季气温升高和河流径流增加，将促进WEC中鞭毛藻的开花。

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