• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Changes over 50 years in fish fauna of a temperate coastal sea: Degradation of trophic structure and nursery function
【24h】

Changes over 50 years in fish fauna of a temperate coastal sea: Degradation of trophic structure and nursery function

机译：温带沿海海域鱼类区系50年的变化：营养结构和苗圃功能的退化

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

The ongoing daily sampling programme of the fish fauna in the Dutch Wadden Sea using fixed gear was analysed for the years 1960-2011. Spring sampling caught immigrating fish from the coastal zone and autumn samples reflected emigration of young-of-the-year. In total 82 fish species were caught with no clear trend in biodiversity. In both spring and autumn total daily catch fluctuated and peaked in the late 1970s. From 1980 to the present catches of both pelagic and demersal species showed a 10-fold decrease in total biomass. Mean individual biomass decreased in spring between 1980 and the present from about 150 to 20 g wet weight. No trend was found in autumn mean individual biomass which fluctuated around 20 g wet weight. The trophic structure remained constant for both the demersal and benthopelagic fish fauna from 1980 to 2011, whilst the trophic position of pelagic fish in spring fell from about 3.9 to 3.1. Min/max auto-correlation factor analysis showed similar trends in spring and autumn species biomass time series: the first axis represented a decrease from the 1960s followed by stabilization from the mid-1990s. The second trend showed an increase with a maximum around 1980 followed by a steady decrease in spring and a decrease and stabilization from 2000 in autumn. It is argued that the most likely explanatory variables are a combination of external factors: increased water temperature, habitat destruction in the coastal zone (sand dredging and beach nourishment, fishing) and increased predation by top predators for the first trend, and large-scale hydrodynamic circulation for the second trend. We conclude that both the trophic structure of the coastal zone fauna and the nursery function of the Wadden Sea have been reduced since the 1980s. Our findings corroborate that ecological change in coastal ecosystems has not only occurred in the past but still continues. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在1960-2011年间，分析了正在进行的使用固定装置对荷兰瓦登海鱼类区系进行日常采样的计划。春季采样捕获了来自沿海地区的移民鱼类，而秋季采样则反映了年幼移民。总共捕获了82种鱼类，但生物多样性没有明显趋势。在春季和秋季，总的日捕捞量在1970年代后期波动并达到顶峰。从1980年到现在，浮游和深海鱼类的捕获量表明总生物量减少了10倍。从1980年到现在，春季平均个体生物量从150克湿重减少到20克湿重。在秋季没有发现趋势，平均个体生物量在20 g湿重附近波动。从1980年到2011年，海底鱼类和底栖鱼类的营养结构保持恒定，而春季浮游鱼类的营养位置从大约3.9下降到3.1。最小/最大自相关因子分析在春季和秋季物种生物量时间序列中显示出相似的趋势：第一个轴表示从1960年代开始减少，然后从1990年代中期开始稳定。第二个趋势显示出增加趋势，在1980年左右达到最大值，然后在春季稳定下降，在2000年秋季下降并稳定下来。有人认为，最可能的解释变量是外部因素的组合：水温升高，沿海地区的栖息地破坏（疏dr沙土和海滩养料，捕鱼）以及顶级掠食者对第一趋势的捕食增加，以及大规模流体动力循环为第二趋势。我们得出的结论是，自1980年代以来，沿海地带动物的营养结构和沃登海的苗圃功能都已减少。我们的发现证实了沿海生态系统的生态变化不仅在过去发生过，而且还在继续。 （C）2015 Elsevier Ltd.保留所有权利。

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