• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Biology: International Journal on Life in Oceans and Coastal Waters >Anthropogenic nutrients mitigate importance of fish-mediated nutrient supply for seagrass beds in Haiti
【24h】

Anthropogenic nutrients mitigate importance of fish-mediated nutrient supply for seagrass beds in Haiti

机译：Anthropogenic nutrients mitigate importance of fish-mediated nutrient supply for seagrass beds in Haiti

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

The supply of nutrients from consumer waste products, i.e., consumer-mediated nutrient dynamics, is critical for primary production in marine environments, especially in oligotrophic systems. However, human impacts can influence the effects of consumer-mediated nutrients in two main ways: (1) overfishing can reduce consumer populations and thus the nutrients they supply, (2) anthropogenic nutrient enrichment can shift baselines of nutrient limitation. Previous work has shown that artificial reefs create biogeochemical hot spots from which nutrient responses by surrounding primary producers can be measured. We constructed eight artificial reefs from 88 cinder blocks in shallow seagrass beds near Ile-a-Vache, Haiti, to test for interacting effects of fish-mediated nutrients and anthropogenic nutrients on growth rates of the dominant seagrass, Thalassia testudinum, surrounding the artificial reefs. We found that (1) anthropogenic nutrient enrichment appears to be the primary factor influencing seagrass growth close to the artificial reef, and (2) despite overall anthropogenic nutrient enrichment effects, consumer-mediated nutrients still generate biogeochemical hot spots and the two nutrient sources additively influence seagrass growth rates. We also found that nitrogen and phosphorus similarly predict seagrass growth rates, and better so than their ratio, indicating the supply rates of nitrogen and phosphorus are both limiting seagrass production. Results from this study indicate that the effect of anthropogenic nutrients can strongly influence seagrass growth in these systems, but consumers can supply a source of nutrients that has additive effects on seagrass growth.

著录项

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