• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Mesozooplankton abundance in relation to the chlorophyll maximum in the Neuse River Estuary, North Carolina, USA: Implications for trophic dynamics
【24h】

Mesozooplankton abundance in relation to the chlorophyll maximum in the Neuse River Estuary, North Carolina, USA: Implications for trophic dynamics

机译：与美国北卡罗来纳州Neuse河口中的叶绿素最大值相关的中小型浮游生物的丰度：对营养动力学的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Estuaries often have distinct zones of high chlorophyll a concentrations, known as chlorophyll maximum (CMAX). The persistence of these features is often attributed to physical (mixing and light availability) and chemical (nutrient availability) features, but the role of mesozooplankton grazing is rarely explored. We measured the spatial and temporal variability of the CMAX and mesozooplankton community in the eutrophic Neuse River Estuary, North Carolina. We also conducted grazing experiments to determine the relative impact of mesozooplankton grazing on the CMAX during the phytoplankton growing season (spring through late summer). The CMAX was consistently located upriver of the zone of maximum zooplankton abundance, with an average spatial separation of 18 km. Grazing experiments in the CMAX region revealed negligible effect of mesozooplankton on chlorophyll a during March, and no effect during June or August. These results suggest that the spatial separation of the peak in chlorophyll a concentration and mesozooplankton abundance results in minimal impact of mesozooplankton grazing, contributing to persistence of the CMAX for prolonged time periods. In the Neuse River Estuary, the low mesozooplankton abundance in the CMAX region is attributed to lack of a low salinity tolerant species, predation by the ctenophore Mnemiopsis leidyi, and/or physiologic impacts on mesozooplankton growth rates due to temperature (in the case of low wintertime abundances). The consequences of this lack of overlap result in exacerbation of the effects of eutrophication; namely a lack of trophic transfer to mesozooplankton in this region and the sinking of phytodetritus to the benthos that fuels hypoxia. (C) 2015 Elsevier Ltd. All rights reserved.
机译：河口通常有高叶绿素a浓度的不同区域，称为最大叶绿素（CMAX）。这些特征的持久性通常归因于物理特征（混合和光的可利用性）和化学特征（营养物的可利用性），但很少研究中小浮游动物放牧的作用。我们测量了北卡罗莱纳州富营养化Neuse河河口的CMAX和中游浮游动物群落的时空变异性。我们还进行了放牧实验，以确定在浮游植物生长季节（春季至夏末）中型浮游动物对CMAX的相对影响。 CMAX始终位于浮游动物最大丰度区的上游，平均空间间隔为18 km。 CMAX地区的放牧实验表明，中型浮游动物对三月叶绿素a的影响可忽略不计，而在六月或八月则没有影响。这些结果表明，叶绿素a浓度峰和中层浮游生物的丰度在空间上的分离导致中层浮游生物放牧的影响降到最低，从而导致了CMAX在较长时间内的持久性。在Neuse河口，CMAX地区中游浮游动物的丰度低是由于缺乏低盐分耐受物种，c虫Mnemiopsis leidyi捕食和/或由于温度对中游浮游动物生长速率的生理影响（在低温情况下）冬季丰富）。这种缺乏重叠的后果导致了富营养化作用的加剧；即在该区域缺乏营养向中型浮游动物的转移，以及植物碎屑向底栖生物的下沉，这加剧了缺氧。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号