...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >Assessing the ecological importance of red tree coral thickets in the eastern Gulf of Alaska
【24h】

Assessing the ecological importance of red tree coral thickets in the eastern Gulf of Alaska

机译：评估阿拉斯加东部海湾红树珊瑚灌丛的生态重要性

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

Red tree corals (Primnoa pacifica), the largest structure-forming gorgonians in the North Pacific Ocean, form dense thickets in some areas. These thickets are a dominant benthic habitat feature in the Gulf of Alaska (GOA), yet little is known about the ecosystems they support. In 2005, we used a submersible to study the ecology of thickets inside or near five small areas of the eastern GOA later designated in 2006 as habitat areas of particular concern (HAPCs)-areas closed to all bottom contact fishing. We show that red tree corals are keystone species in habitats where they form thickets (mean density O.52 corals m~(-2))-the densest and largest thickets documented anywhere. Measured sponge densities (2.51 sponges m~(-2)) were also among the highest documented anywhere. The corals and sponges in the study areas provide essential fish habitat for some fish species, and we show with logistic regression models modified with a scaled binomial variance that bedrock, while important habitat for some fish, is even more important when paired with corals and sponges. Red tree corals were not equally distributed with regard to habitat characteristics, and we show that their presence was correlated with bedrock substrate, moderate to high seabed roughness, and slope ＞10°. Most corals and sponges are vulnerable to disturbance from longlining, the principal bottom contact fishing in this region, but the larger corals and sponges are the most vulnerable. We observed evidence of infrequent recruitment events and a strong pulse of predation, apparently from fishing gear-induced trauma, that could exacerbate slow recovery of red tree corals from disturbance. Some red tree coral thickets are provided protection within designated HAPCs and some are not. Modifications to longline gear and an expanded network of HAPCs could help preserve these keystone species and the ecosystems they support.
机译：红树珊瑚（Primnoa pacifica）是北太平洋地区最大的形成结构的古尔冈人，在某些地区形成密集的灌木丛。这些灌木丛是阿拉斯加湾（GOA）的主要底栖生境特征，但对其所支持的生态系统知之甚少。在2005年，我们使用潜水器研究了GOA东部五个小区域内或附近的灌丛的生态，后来在2006年将其指定为特别关注的栖息地（HAPC）-禁止所有海底接触捕鱼的区域。我们发现，红树珊瑚是它们形成灌木丛（平均密度O.52珊瑚m〜（-2））的生境中的关键物种，灌木丛是任何地方记录的最密集和最大的灌木丛。测得的海绵密度（2.51海绵m〜（-2））也在任何地方都有最高记录。研究区域中的珊瑚和海绵为某些鱼类提供了重要的鱼类栖息地，并且我们通过对逻辑回归模型进行了修正，该模型通过按比例的二项式方差进行了修正，即基岩虽然对某些鱼类而言是重要的栖息地，但与珊瑚和海绵配对时显得尤为重要。红树珊瑚的栖息地特征分布不均，我们发现它们的存在与基岩基质，中等至高的海底粗糙度以及坡度＞ 10°有关。大多数珊瑚和海绵很容易受到延绳钓的干扰，延绳钓是该区域主要的底部接触捕捞活动，但较大的珊瑚和海绵最为脆弱。我们观察到了罕见的征募事件和强烈的掠食事件的证据，显然是由于渔具引起的创伤，这可能加剧红树珊瑚从干扰中恢复缓慢。在指定的HAPC中提供了一些红树珊瑚灌木丛的保护，而有些则没有。修改延绳钓装备和扩大HAPC网络可以帮助保护这些关键物种及其支持的生态系统。

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