• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology >Long-term spatial dynamics in vegetated seascapes: fragmentation and habitat loss in a human-impacted subtropical lagoon
【24h】

Long-term spatial dynamics in vegetated seascapes: fragmentation and habitat loss in a human-impacted subtropical lagoon

机译：植被海景的长期空间动力学：人类影响的亚热带泻湖中的破碎化和栖息地丧失

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

Vegetated coastal seascapes exhibit dynamic spatial patterning, some of which is directly linked to human coastal activities. Human activities (e.g. coastal development) have modified freshwater flow to marine environments, resulting in significant changes to submerged aquatic vegetation (SAV) communities. Yet, very little is known about the spatially complex process of SAV habitat loss and fragmentation that affects ecosystem function. Using habitat mapping from aerial photography spanning 71years (1938–2009) for Biscayne Bay (Florida, USA), we quantify both SAV habitat loss and fragmentation using a novel fragmentation index. To understand the influence of water management practices on SAV seascapes, habitat loss and fragmentation were compared between nearshore and offshore locations, as well as locations adjacent to and distant from canals that transport freshwater into the marine environment. Habitat loss and fragmentation were significantly higher along the shoreline compared with offshore seascapes. Nearshore habitats experienced a net loss of 3.31% of the total SAV mapped (2.57km2) over the time series. While areas adjacent to canals had significantly higher SAV cover, they still experienced wide fluctuations in cover and fragmentation over time. All sites exhibited higher fragmentation in 2009 compared with 1938, with four sites exhibiting high fragmentation levels between the 1990s and 2000s. We demonstrate that freshwater inputs into coastal bays modify the amount of SAV and the fragmentation dynamics of SAV habitats. Spatial changes are greater close to shore and canals, indicating that these coastal developments have transformative impacts on vegetated habitats, with undetermined consequences for the provisioning of ecosystem goods and services.
机译：植被繁茂的沿海海景表现出动态的空间格局，其中一些与人类沿海活动直接相关。人类活动（例如沿海开发）已经改变了淡水向海洋环境的流动，从而导致了水下水生植物群落的重大变化。然而，关于SAV生境丧失和破碎影响生态系统功能的空间复杂过程知之甚少。使用Biscayne湾（美国佛罗里达）历时71年（1938-2009年）的航空摄影栖息地地图，我们使用新的破碎指数对SAV栖息地的丧失和破碎进行了量化。为了了解水管理实践对SAV海景的影响，比较了近岸和近海位置以及将淡水运输到海洋环境的运河附近和远离运河的位置之间的栖息地丧失和破碎化情况。与近海海景相比，沿海岸线的生境丧失和破碎化程度明显更高。在该时间序列中，近岸生境的净损失占所绘制SAV总面积（2.57 km2）的3.31％。尽管与运河相邻的地区的SAV覆盖率明显更高，但随着时间的推移，它们的覆盖率和碎片化仍会出现较大的波动。与1938年相比，2009年所有站点的碎片化程度都较高，在1990年代至2000年代之间有四个站点的碎片化程度较高。我们证明，向沿海海湾的淡水输入会改变SAV的数量和SAV生境的破碎动态。靠近海岸和运河的空间变化更大，表明这些沿海开发对植被生境产生了变革性影响，对生态系统产品和服务的提供没有确定的后果。

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