• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Conservation Biology >Fish faunal resurgence in Lake Nabugabo, East Africa
【24h】

Fish faunal resurgence in Lake Nabugabo, East Africa

机译：东非纳布加博湖的鱼类动物复活

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

In Lake Nabugabo, Uganda, a small satellite of the equatorial Lake Victoria, approximately 50% of the indigenous fish species disappeared from the open waters subsequent to establishment of the introduced predatory Nile perch (Lates niloticus). However, several of these species persisted in wetland refugia. Over the past decade, Nile perch in Lake Nabugabo have been intensively fished. Herein we report a resurgence of some indigenous species in open waters. In a multiyear study, we used annual transects in inshore and offshore waters of exposed (no wetland) and wetland habitats to document the pattern of resurgence. In 1995, haplochromine cichlids were largely confined to inshore areas, particularly wetland ecotones, and were rare in Nile perch stomachs, as were most other indigenous species. By 2000 haplochromine cichlids were abundant in inshore and offshore areas of both exposed and wetland transects. Several indigenous noncichlids also reappeared in the main lake, including three of the four original mormyrid species. Between 1995 and 1999, there was a dramatic increase in the proportion of haplochromines in the diet of Nile perch. When haplochromines were rare (1995), Nile perch switched from an invertebrate-dominated diet to piscivory at a large size (30 cm total length). In 2000, however, Nile perch were strongly piscivorous by 5-10 cm total length. The pattern of faunal loss and recovery in Lake Nabugabo demonstrates the importance of refugia in providing the seeds of resurgence and provides a model with which to understand some changes in Lake Victoria. [References: 41]
机译：在乌干达赤道维多利亚湖的小型卫星乌干达纳布加博湖中，引进的掠食性尼罗河鲈（Lates niloticus）建立后，约有50％的土著鱼类从开放水域消失。但是，这些物种中有几个在湿地避难所中持续存在。在过去的十年中，纳博加博湖的尼罗河鲈鱼被大量捕捞。在此，我们报告了一些开放水域中的一些本土物种的复兴。在一项多年研究中，我们使用裸露（无湿地）和湿地生境的近岸和近岸水域的年度样带来记录复苏的模式。 1995年，单倍铬素丽鱼科鱼主要局限于近海地区，尤其是湿地过渡带，在尼罗河鲈鱼中很少见，与其他大多数本地物种一样。到2000年，裸露的和湿地样带的近岸和近海地区都富含单倍铬丽鱼慈鲷。主湖中还出现了几种土著非丽鱼科动物，包括四个原始虫科物种中的三个。在1995年至1999年之间，尼罗河鲈鱼饮食中单倍铬碱的比例急剧增加。当单倍铬碱稀少时（1995年），尼罗河鲈鱼从无脊椎动物为主的饮食转变为大型食肉动物（总长30厘米）。但是，在2000年，尼罗河鲈鱼的食肉性很强，总长度为5-10厘米。纳博加博湖中动物群丧失和恢复的模式表明了避难所在提供复兴种子方面的重要性，并提供了一个模型来理解维多利亚湖的某些变化。 [参考：41]

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