• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Changes in shallow-reef community composition along environmental gradients on the East African coast
【24h】

Changes in shallow-reef community composition along environmental gradients on the East African coast

机译：东非海岸沿环境梯度浅礁生物群落组成的变化

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

Abiotic determinants of community composition on shallow reefs are seldom examined at a scale transcending biogeographic regions, and knowledge for the western Indian Ocean is sparse. To address this deficit, turnover in reef community composition was quantified, using gradient forest analyses, along gradients of nine abiotic variables collected in situ or via remote sensing at 54 sites across and within three bioregions: Tropical Western Indian Ocean (Tropical WIO), Delagoa and Natal, spanning 4800 km of east African coastline (5.2-31.1 degrees S). All oceanographic variables differed significantly among bioregions. At a scale across bioregions, wave height declined northwards, while temperature increased. Values for suspended inorganic sediments, chlorophyll-a concentration [chl-a], turbidity and nutrients were all lowest in Delagoa, in association with the scarcity of rivers there. The most novel and unexpected finding was that the northwards decline in wave action was more strongly associated with changes in community composition across bioregions than any other variable. Temperature was the second-most important variable at that scale. Within bioregions, temperature and [chl-a] had strongest relationships with community composition in the Tropical WIO. By contrast, in Delagoa, reef profile, susceptibility to sand inundation and reef heterogeneity were most strongly associated with community composition; and in Natal, depth, turbidity and suspended sediment were foremost. Variables of greatest importance within bioregions distilled to (1) those influencing food/energy supply ([chl-a], turbidity, depth and suspended sediments), which were of particular importance in the Tropical WIO and Natal bioregions, and (2) those altering sand inundation and small-scale current dynamics of reefs (profile, heterogeneity and depth), which were leading factors in the Delagoa Bioregion.
机译：很少在超越生物地理区域的规模上检查浅礁生物群落组成的非生物决定因素，并且对印度洋西部的知识很少。为了解决这一不足，利用梯度森林分析，沿原位收集的九个非生物变量或通过遥感在三个生物区域内和之内的54个地点和热带地区进行了定量分析，量化了珊瑚礁群落组成的周转率：热带西印度洋（热带WIO），德拉戈亚和纳塔尔（Natal），横跨4800公里的东非海岸线（南北5.2-31.1度）。在生物区域之间，所有海洋变量都存在显着差异。在整个生物区域中，波浪高度向北下降，而温度升高。悬浮的无机沉积物，叶绿素-a浓度[chl-a]，浊度和养分的值在德拉戈阿最低，这与那里的河流稀缺有关。最新颖，最出乎意料的发现是，波浪作用向北的下降与跨生物区域的群落组成变化的相关性高于其他任何变量。在该规模上，温度是第二重要的变量。在生物区域内，温度和[chl-a]与热带WIO中社区组成的关系最密切。相比之下，在德拉戈亚，礁石剖面，对沙漏的易感性和礁石异质性与群落组成最密切相关。在纳塔尔，深度，浊度和悬浮沉积物是最重要的。在生物区中最重要的变量被提炼为（1）影响食物/能量供应的那些（[chl-a]，浊度，深度和悬浮沉积物），在热带WIO和纳塔尔生物区中特别重要，以及（2）改变了沙浸和珊瑚礁的小尺度当前动态（剖面，异质性和深度），这是德拉戈亚生物区的主要因素。

著录项

  • 来源
    《Marine biology》 |2017年第5期|101.1-101.16|共16页
  • 作者

    Porter Sean N.; Branch George M.; Sink Kerry J.;

  • 作者单位

    Oceanog Res Inst, POB 10712, ZA-4056 Durban, South Africa|Univ Cape Town, Marine Res Inst, Dept Biol Sci, ZA-7701 Rondebosch, South Africa;

    Univ Cape Town, Marine Res Inst, Dept Biol Sci, ZA-7701 Rondebosch, South Africa;

    South African Natl Biodivers Inst, ZA-7735 Claremont, South Africa;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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