• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>other >Density-Dependence in Space and Time: Opposite Synchronous Variations in Population Distribution and Body Condition in the Baltic Sea Sprat (Sprattus sprattus) over Three Decades
【2h】

Density-Dependence in Space and Time: Opposite Synchronous Variations in Population Distribution and Body Condition in the Baltic Sea Sprat (Sprattus sprattus) over Three Decades

机译：时空的密度依赖性：三个十年来波罗的海西鲱（Sprattus sprattus）的种群分布和身体状况的相反同步变化

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Spatio-temporal density-dependent processes are crucial regulatory factors for natural populations. However, there is a lack of studies addressing spatial density-dependence in fish growth. A previous investigation has suggested spatio-temporal density-dependence in body condition of Baltic sprat. Here, we used different techniques, such as centre of gravity, distance, and homogeneity indices, to better characterize the spatial and temporal variations in sprat density and body condition in the Baltic Proper. Our results evidenced a negative spatio-temporal co-variation between the centres of gravity of density and maximum condition. In the 1980s-early 1990s both centres were located in the middle of the Baltic Proper. From the mid 1990s the centres progressively separated in space, as the sprat population moved towards the north-eastern Baltic Proper, and the centre of maximum condition towards the south-western areas. Moreover, at low abundances, sprat density and condition were homogeneously distributed in space, whereas at high abundances both density and condition showed pronounced geographical gradients. The ecological processes potentially explaining the observed patterns were discussed in the light of the Ideal Free Distribution theory. We provide evidence that the shift in the spatial distribution of cod, the main predator of sprat, has been the main factor triggering the overall spatial changes in sprat density, and thus condition, during the past thirty years. The spatial indices shown here, synthesizing the spatio-temporal patterns of fish distribution, can support the implementation of the EU Marine Strategy Framework Directive.
机译：时空密度依赖性过程是自然种群的关键调控因素。但是，缺乏针对鱼类生长中空间密度依赖性的研究。先前的研究表明波罗的海鲱的身体状况时空密度依赖性。在这里，我们使用了不同的技术，例如重心，距离和同质性指数，以更好地刻画波罗的海适当地区的鲱鱼密度和身体状况的时空变化。我们的结果证明了密度重心和最大条件之间的负时空协变。在1980年代至1990年代初期，两个中心都位于波罗的海波普尔中部。从1990年代中期开始，随着鲱鱼种群移向波罗的海东北部，最高条件中心移向西南地区，中心逐渐在空间上分离。此外，在低丰度时，小枝密度和状况在空间中均匀分布，而在高丰度时，密度和状况均显示出明显的地理梯度。根据理想自由分布理论，讨论了可能解释观测模式的生态过程。我们提供的证据表明，在过去的30年中，作为鲱鱼主要捕食者的鳕鱼的空间分布发生了变化，成为触发了整个鲱鱼密度和条件变化的主要因素。这里显示的空间指数综合了鱼类分布的时空格局，可以支持欧盟海洋战略框架指令的实施。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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