...
  • 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 >Artisanal trawling impact over prey availability and diet of estuarine megabenthic organisms in southern Brazil
【24h】

Artisanal trawling impact over prey availability and diet of estuarine megabenthic organisms in southern Brazil

机译：手工拖网对巴西南部河口大型底栖生物的猎物供应和饮食的影响

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

Trawling fisheries cause in their path uncounted impacts, including direct and indirect effects. This study aimed to evaluate the impact of artisanal trawls on the food availability and its possible impact on the diet of two commercial crustacean species, the pink-shrimp Penaeus paulensis and the blue crab Callinectes sapidus. Two mesocosms were constructed (control and simulated fishing), where sediment samples were collected to analyze the zoobenthos, sediment grain sizes and the percentage of organic matter. Sediment samples were separated into two strata (0-5 and 5-10 cm depth) to evaluate the vertical structure of the fauna, the availability of prey and possible shifts in these patterns after trawling. The Prey-Specific Index of Relative Importance was used in stomach contents analyses. Significant decreases in the percentage of organic matter were observed before and after trawling. Perturbations caused by trawling activities resulted in alterations on the superficial layer, with significant changes in zoobenthos total abundance induced by resuspension and settlement of organisms in other places. Changes in the abundance and richness of zoobenthic organisms caused by trawling were reflected in the diet of pink shrimp and blue crab. A decrease in the main ingested organisms and an increase in the ingestion of more refractory and less energetic items (mainly plants) occurred. Overall, there was a significant effect of trawling on benthic organisms, in particular cases reflected in the predators stomach content, further confirming the impact of trawling on estuarine trophic webs.
机译：拖网捕捞渔业在其发展过程中造成了不可估量的影响，包括直接和间接影响。这项研究旨在评估手工拖网对食物供应的影响及其对两种商业甲壳类物种（粉对虾对虾和蓝蟹Callinectes sapidus）饮食的可能影响。建造了两个中观空间（控制捕鱼和模拟捕鱼），在其中收集了沉积物样本，以分析底栖动物，沉积物的粒径和有机质的百分比。将沉积物样本分为两个层次（深度为0-5和5-10厘米），以评估动物区系的垂直结构，猎物的可用性以及拖网后这些模式的可能变化。相对含量的猎物特异性指数用于胃内容物分析。拖网前后有机物的百分比显着下降。拖网活动引起的扰动导致表层发生变化，其他地方生物的重悬和沉降引起的底栖动物总丰度发生了显着变化。拖网捕虾引起的底栖生物的丰度和丰富度变化反映在粉红色虾和蓝蟹的饮食中。发生了主要摄食生物的减少以及摄食更多难治性和低能项目（主要是植物）的增加。总体而言，拖网对底栖生物具有显着影响，特别是在掠食者的胃内容物中反映出的情况，进一步证实了拖网对河口营养网的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
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