...
  • 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 >Temporal and spatial dynamics of ephemeral drift-algae in eelgrass, Zostera marina, beds
【24h】

Temporal and spatial dynamics of ephemeral drift-algae in eelgrass, Zostera marina, beds

机译：鳗草，带状疱疹，床的临时浮藻的时空动态

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

Aggregations of unattached, filamentous macroalgae showed high temporal and spatial dynamics in two shallow and relatively sheltered eelgrass (Zostera marina) beds in Aarhus Bay and the Isefjord, Denmark. The changes in algal abundance were followed in permanent plots at 1-3 days intervals during three different periods of the growth season (May—September). Drift-algal assemblages were present within the 3000 m~2 study areas in relatively high and constant abundance (>47% cover) throughout the study period. However, significant changes in average site cover did occur on short timescales (days) suggesting that variability in algal cover may be undetected in monthly assessments. The changes in cover were caused either by algal growth or by physical forces moving large aggregations of algae into or out of the study area. Within plots (1 m~2) variability was even higher and algal cover changed regularly between observations (days). Hence, the algae were continuously rearranged within the eelgrass beds; also during periods with no change in average algal cover. The variability in cover of individual plots was negatively correlated to eelgrass cover, suggesting that algae were retained by the eelgrass leaves. This highly dynamic nature of filamentous macroalgal aggregations in eelgrass beds should be considered when evaluating implications of macroalgal blooms for seagrass growth and survival. A frequent relocation of drift-algae at small spatial scale may moderate the formation of poor oxygen conditions within mats and shorten the duration of exposure experienced by individual shoots.
机译：在奥尔胡斯湾和丹麦伊瑟峡湾的两个浅层且相对庇护的鳗草（Zostera marina）河床中，未附着的丝状大型藻类聚集体显示出较高的时空动态。在生长季的三个不同时期（5月至9月），以1-3天的间隔在永久性地块中跟踪藻类丰度的变化。在整个研究期间，漂流藻类组合物以相对较高且恒定的丰度（> 47％的覆盖率）存在于3000 m〜2的研究区域内。但是，平均站点覆盖率确实在短时间范围（天）上发生了显着变化，这表明藻类覆盖率的变异性可能在每月评估中未被发现。覆盖率的变化是由于藻类的生长或物理力将大量藻类聚集体移入或移出研究区域所致。在地块内（1 m〜2），变异性甚至更高，观察之间（天）的藻类覆盖率定期变化。因此，藻类在鳗草床中不断地重新排列。在平均藻类覆盖率没有变化的时期。各个样地的覆盖变化与鳗草覆盖负相关，表明藻类被鳗草叶子保留。在评估大型藻类开花对海草生长和存活的影响时，应考虑鳗鱼床中丝状大型藻类聚集体的这种高度动态性。在较小的空间尺度上频繁迁移藻类可能会缓解垫子内不良氧气条件的形成，并缩短单个枝条经历的暴露时间。

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