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首页> 外文期刊>Estuarine Coastal and Shelf Science >Outside the paradigm of up welling rias in NW Iberian Peninsula: Biogeochemical and phytoplankton patterns of a non-upwelling ria
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Outside the paradigm of up welling rias in NW Iberian Peninsula: Biogeochemical and phytoplankton patterns of a non-upwelling ria

机译：西北部伊比利亚半岛上升井rias的范式之外：非上升井ria的生物地球化学和浮游植物模式

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The Atlantic Galician rias show the effect of natural eutrophication during ENACW upwelling episodes when large amounts of nutrients are injected. However, the Cantabrian Galician rias do not appear to be disturbed by upwelling events and it can be hypothesized that eutrophy is not inherent to the Galician rias. This question was tackled regarding the biogeochemical and phytoplankton characteristic in the Ria of Barqueiro, located on the western boundary of the Cantabrian Sea, from January 2008 to January 2009. Thermohaline, PAR and fluorescence profiles, dissolved oxygen, nutrient salts, DOC, DON and chlorophyll concentrations, phytoplankton abundances and primary production were monthly determined in a monitoring station (43°45.509'N-07°39.493'W); moreover, the daily upwelling index information and fluvial contributions from Sor River were considered. Throughout the year only four annual oceano-graphic periods were observed: spring, summer stratification, autumn and winter, unlike the Atlantic rias, where a long upwelling period occurs with usually outstanding upwelling processes. Nutrient concentrations (a maximum of 6.2 μM of nitrate, 0.5 μM of nitrite, 2.8 μM of ammonium, 0.4 μM of phosphate and 5.7 μM of silicate), organic matter (98 μM of DOC, 14 μM of DON, 16.4 μM of POC and 2.0 μM of PON), Chl-α (1.1 μg L~(-1)), primary production (280 gC m~(2) yr~(-1)) and phytoplankton abundance were clearly lower (about half) when compared to those reported for the other rias during upwelling. Diatoms dominated the phytoplankton assemblages especially during spring and autumn blooms. In summer, although the wind conditions were favorable, upwelling was not observed in the Ria and a mixing of diatoms and dinoflagellates co-dominated the phytoplankton community with a lower contribution of diatoms in comparison to the Atlantic rias. The paradigm of natural eutrophication reported for the Galician rias was not observed in the Ria of Barqueiro, which may be classified as an oligo-mesotrophic ria-type, according to its environmental patterns.
机译：当注入大量营养素时，大西洋加利西亚里亚斯显示出ENACW上升期间自然富营养化的影响。但是，坎塔布连加利里亚里亚斯似乎并未受到上升事件的干扰，并且可以假设富营养并非加利西亚里亚斯固有的。 2008年1月至2009年1月，位于坎塔布连海西边界的Barqueiro Ria地区的生物地球化学和浮游植物特征解决了这个问题。热盐，PAR和荧光图，溶解氧，营养盐，DOC，DON和在一个监测站（43°45.509'N-07°39.493'W）每月测定叶绿素浓度，浮游植物的丰度和初级生产力。此外，还考虑了索尔河的每日上升指数信息和河流贡献。在全年中，仅观察到四个年度海洋图形时期：春季，夏季分层，秋季和冬季，与大西洋rias不同，在大西洋rias上发生长的上升期，通常具有出色的上升过程。营养物浓度（最大6.2μM硝酸盐，0.5μM亚硝酸盐，2.8μM铵，0.4μM磷酸盐和5.7μM硅酸盐），有机物（98μMDOC，14μMDON，16.4μMPOC和与相比，2.0μM的PON），Chl-α（1.1μgL〜（-1）），初产（280 gC m〜（2）yr〜（-1））和浮游植物的丰度明显较低（约一半）那些在上升过程中针对其他rias的报道。硅藻在浮游植物群中占主导地位，特别是在春季和秋季开花期间。在夏季，尽管风势良好，但在Ria中未观察到上升流，硅藻和硅藻鞭毛虫的混合以浮游植物群落为主，与大西洋rias相比，硅藻的贡献较低。在Barqueiro的Ria中未观察到针对加利西亚rias报道的自然富营养化范例，根据其环境模式，该地区可归类为低营养中营养ria型。

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