...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Sciences >Competitive effects of fish in structurally simple habitats: perch, invertebrates, and goldeneye in small boreal lakes
【24h】

Competitive effects of fish in structurally simple habitats: perch, invertebrates, and goldeneye in small boreal lakes

机译：鱼在结构简单的栖息地中的竞争作用：小型北方湖泊中的鲈鱼，无脊椎动物和金眼鱼

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

We determined the associations between Eur asian perch Perca fluviatilis, invertebrates, and common goldeneye Bucephala clangula in boreal lakes. Our aim was to test the hypothesis that perch play a controlling role in small, oligotrophic, acidic, and poorly vegetated boreal lakes, affecting both invertebrate numbers and community structure. In addition, we predicted that perch impact lake usage by goldeneye. In the observational part of our study, we first explored the association between perch, inverte brates and goldeneye (pairs and broods per shore km) in 18 boreal, poorly vegetated lakes. Perch densities were asso ciated negatively with invertebrate abundance and lake usage by goldeneye broods. In the experimental part in three fish-free lakes, we found that upon successful perch introductions, the number and biomass of invertebrates, the proportion of large dytiscids, and lake usage by goldeneye broods significantly decreased. We conclude that perch apparently plays a key role as a predator of invertebrates in boreal lakes with few aquatic macrophytes. It is evident that perch can strongly affect their prey populations and communities, and this predation may have an indirect effect on species, e.g. goldeneye, that consume the same prey.
机译：我们确定了在北方湖泊中的欧洲鲈鱼Perca fluviatilis，无脊椎动物和常见的金眼蟾蜍c之间的联系。我们的目的是检验以下假设，即鲈鱼在小型，贫营养，酸性和植被差的北方湖泊中起控制作用，同时影响无脊椎动物的数量和群落结构。另外，我们预测鲈鱼会影响白点对湖泊的利用。在我们研究的观察部分，我们首先探索了18个植被欠佳的北方湖泊中鲈鱼，无脊椎动物，金眼鱼（每岸千米的成对和育雏）之间的关系。鲈鱼密度与无脊椎动物的丰度和金眼鱼类对湖泊的利用负相关。在三个无鱼湖泊的实验部分，我们发现，成功地引入鲈鱼后，无脊椎动物的数量和生物量，大型dydycids的比例以及金眼鱼的湖泊使用量显着下降。我们得出的结论是，在水生植物很少的北方湖泊中，鲈鱼显然是无脊椎动物捕食者的关键角色。显然，鲈鱼可以强烈影响其捕食者的种群和群落，这种捕食可能会对物种产生间接影响，例如黄金眼，消耗相同的猎物。

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