• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Biomass and composition of the phytoplankton in the Rio de la Plata: large-scale distribution and relationship with environmental variables during a spring cruise
【24h】

Biomass and composition of the phytoplankton in the Rio de la Plata: large-scale distribution and relationship with environmental variables during a spring cruise

机译：里约热内卢浮游植物的生物量和组成：春季航行期间的大规模分布及其与环境变量的关系

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

The distributions of phytoplankton taxa, and biomass were recorded to assess their association to environmental variables in the Rio de la Plata, a shallow and highly turbid estuary. Forty-seven CTD stations covering the whole estuary were sampled from 5 to 16 November 2001. At 31 stations, dissolved oxygen concentration, pH, and light intensity at 50 cm depth intervals were recorded in situ; also, samples were taken for measurement of dissolved nutrient levels (nitrate, ammonium, phosphate, and silicate), suspended particulate matter and particulate organic matter loads, chlorophyll (a, b, and c) concentration, and phytoplankton identification. Stations ordination (multi-dimensional scaling, MDS, analysis) on environmental data suggested two main groups (upper middle and lower estuary) but stressed the gradual change of conditions along the ecosystem. MDS on pigment data suggested a tendency for higher biomass levels in the lower estuary; MDS based on species indicated two main groups corresponding to lower and upper-middle estuarine stations. Spearman rank correlations of environmental and pigment similarity matrices suggested that salinity, the ratio of mixed to photic depth, and nitrates were the variables best explaining pigments distribution, in turn, the variables best explaining species distribution were salinity and seston. Results suggest an overriding importance of salinity-light gradients in modulating biomass levels and species distribution in the Rio de la Plata. This result is consistent with processes known to modulate phytoplankton distribution and production in other highly turbid estuaries. (C) 2004 Elsevier Ltd. All rights reserved.
机译：记录浮游植物类群和生物量的分布，以评估其与浅滩和高浑浊河口里约热内卢的环境变量之间的关系。 2001年11月5日至16日，对覆盖整个河口的47个CTD站进行了采样。在31个站中，现场记录了以50 cm深度间隔的溶解氧浓度，pH和光强度;此外，还采集了样品以测量溶解的营养物含量（硝酸盐，铵盐，磷酸盐和硅酸盐），悬浮颗粒物和颗粒有机物的含量，叶绿素（a，b和c）的浓度以及浮游植物的鉴定。根据环境数据进行的站级排序（多维标度，MDS，分析）建议了两个主要组（中上河口和下河口），但强调了沿生态系统条件的逐渐变化。关于颜料数据的MDS表明在较低河口生物量水平较高的趋势。基于物种的MDS指示了两个主要组，分别对应于上下河口站。环境和色素相似性矩阵的Spearman等级相关性表明，盐度，混合深度与光合深度的比率以及硝酸盐是最能解释色素分布的变量，而最能解释物种分布的变量是盐度和硒。结果表明，盐度-光梯度在调节里约热内卢的生物量水平和物种分布中至关重要。该结果与已知在其他高度浑浊的河口中调节浮游植物分布和生产的过程一致。 （C）2004 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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