首页> 外文期刊>Biological Conservation >Habitat diversity and structure regulate British bird richness: Implications of non-linear relationships for conservation
【24h】

Habitat diversity and structure regulate British bird richness: Implications of non-linear relationships for conservation

机译:栖息地多样性和结构规范英国鸟丰富:非线性关系保护的影响

获取原文
获取原文并翻译 | 示例
       

摘要

Spatial environmental heterogeneity (EH) is an important factor determining species richness among many taxa across spatial scales. Increased EH may support higher diversity mainly by providing a higher number of ecological niches. However, the shapes of the EH-diversity relationships and their influence on diversity measures at landscape scales are poorly understood. We used random forests regression models to assess the relationships between different components of EH and bird species richness across Great Britain. Bird data were obtained using BTO/JNCC/RSPB Breeding Bird Survey methods across 335 UK Countryside Survey (CS) 1-km squares in 2000. Data on components of EH, including; vegetation, habitat diversity, and habitat structure were collected in associated field surveys. Using the results of our EH component-bird richness models, we applied the case of the likely decline of the ash tree, a species of conservation concern and a key component of British landscape complexity, to create predictive scenarios of future bird richness. We found that EH components had a strong positive effect on bird richness and identified six key components that explained over 70% of variance in bird richness. Bird richness responses were strongly dependent on the specific EH components and were generally non-linear, especially for habitat structural variables, such as lines of trees and hedges. Our predictive scenarios showed a decrease in bird species richness only for simulated ash tree decreases within the habitat structural variables of over 90%, and only for areas where this tree species was a particularly abundant component of the landscape. Our findings, showing that bird richness responses differ for EH components, and that non-linear responses are common, could help the 'design' of landscapes that enhance bird diversity. In particular, our study indicates that, in some cases, increasing the occurrence of key structural components of habitat (such as ensuring a minimum of 700 m of managed hedges or a minimum of 70 individual trees per km square), could have disproportionally positive impacts on bird richness.
机译:空间环境异质性(EH)是在空间尺度上确定许多分类群中的物种丰富性的重要因素。 EH的增加可能主要通过提供更高数量的生态利基来支持更高的多样性。然而,EH-多样性关系的形状及其对景观尺度的多样性措施的影响很差。我们使用随机森林回归模型来评估欧盟和鸟类跨英国禽生场丰富的关系。在2000年,使用BTO / JNCC / RSPB育种鸟类调查方法获得鸟类数据。2000年的1公里处的1公里广场。欧盟组成部分数据,包括;在相关领域调查中收集了植被,栖息地和栖息地结构。使用我们的EH组件 - 鸟类丰富模型的结果,我们申请了灰树的可能下滑,一个保护问题和英国景观复杂性的关键组成部分,以创造未来鸟丰富的预测情景。我们发现EH组件对鸟丰富度具有很强的积极影响,并确定了六个关键组成部分,该组件解释了鸟丰富的70%以上。鸟丰富的反应强烈依赖于特定的EH成分,并且通常是非线性的,特别是对于栖息地结构变量,例如树木和篱笆线。我们的预测情景表明,仅针对模拟灰树的栖息地结构变量减少超过90%,并且仅适用于该树种是景观特别丰富的部件的区域的栖息地的灰色树木减少。我们的研究结果表明,鸟丰富的反应对EH组件不同,并且非线性响应很常见,可以帮助增强鸟类多样性的景观的“设计”。特别是,我们的研究表明,在某些情况下,在某些情况下,增加栖息地的关键结构部件的发生(例如确保至少700米的管理套期保值或每公里广场的最少70棵树),可能具有不成比例的积极影响在鸟丰富。

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