...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecosphere >Large, infrequent disturbance on a regulated river: response of floodplain forest birds to the 2011 Missouri River flood
【24h】

Large, infrequent disturbance on a regulated river: response of floodplain forest birds to the 2011 Missouri River flood

机译：受管制的河道上的大型且罕见的干扰：洪泛区森林鸟类对2011年密苏里河洪水的反应

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Floodplain forests are dynamic habitats that support a high diversity and abundance of birds. Periodic flood disturbance is important in the establishment and maintenance of the heterogeneous mosaic of vegetation communities across the riverine landscape. Human suppression of disturbance regimes has been implicated in the decline of bird species in these systems. Because few large rivers are not subject to flood control by dams and levees, opportunities to study avian responses to flood disturbance are limited. A large magnitude, long‐duration flood event on the Missouri River, USA, during the summer of 2011 provided an opportunity to quantify post‐flood changes in forest bird densities and species richness relative to pre‐flood conditions on a riverine floodplain impacted by decades of flow regulation. We surveyed 75 forest sites on two segments of remnant floodplain forest along the Missouri National Recreational River (MNRR) in southeastern South Dakota and northeastern Nebraska and examined changes in density for 35 breeding landbird species from pre‐flood (2009–2010) to post‐flood (2012–2014) periods. We used a repeated measures ANOVA design to test the effects of year on average densities of birds and nesting guilds and confidence intervals to determine changes in densities of individual species and species richness. 19 of 35 focal species declined significantly one year after the flood (2012), but abundances of ten species recovered to pre‐flood densities or higher within two years. In 2012, density declines of six species and density increases of two species were significantly correlated with a decrease in woody vegetation density and percent shrub cover. Average bird densities and the density of shrub nesters rebounded in 2013 to pre‐flood levels and continued to increase through 2014. There were no significant changes in species richness at the level of forest habitat types between sampling years. Our results demonstrate short‐term resilience of floodplain bird species to a major disturbance despite declines in early successional habitat and minimal recovery of woody vegetation.
机译：洪泛区森林是动态的栖息地，可支持鸟类的高度多样性和丰富性。周期性的洪水扰动对于建立和维持整个河流景观中植被群落的异质镶嵌非常重要。在这些系统中，人类对干扰机制的抑制与鸟类物种的减少有关。由于很少有大河不受大坝和堤坝的洪水控制，因此研究鸟类对洪水干扰的反应的机会有限。 2011年夏季，美国密苏里河上发生了一次大规模的长期洪水事件，为量化受数十年影响的河流泛滥平原上森林鸟类密度和物种丰富度相对于洪水前状况的洪水后变化提供了机会。流量调节。我们调查了南达科他州东南部和内布拉斯加州东北部密苏里州国家休闲河（MNRR）上两片剩余洪泛区森林中的75个森林地点，并研究了从洪灾前（2009-2010年）到洪灾后35种繁殖陆鸟物种的密度变化。洪水（2012-2014年）期间。我们使用重复测量方差分析设计来测试年份对鸟类和筑巢行会的平均密度以及置信区间的影响，以确定单个物种和物种丰富度的密度变化。洪水发生一年后（2012年），有35种主要物种中的19种显着下降，但两年内有10种物种恢复到洪灾前的密度或更高。 2012年，六种树种的密度下降和两种树种的密度上升与木本植物密度和灌木覆盖率的下降显着相关。 2013年平均鸟类密度和灌木巢的密度反弹至洪灾前的水平，并在2014年之前持续增加。在采样年之间，森林栖息地类型的物种丰富度没有显着变化。我们的结果表明，尽管早期演替生境有所减少，木本植物的恢复却很少，但洪泛区鸟类对短期扰动的抵抗能力却很强。

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