Status of the glass sponge reefs in the Georgia Basin
Status of the glass sponge reefs in the Georgia Basin
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DOI：
10.1016/j.marenvres.2008.09.002
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发表时间：
2008-01-01
影响因子：
3.3
通讯作者：
Burd, Brenda
中科院分区：
文献类型：
--
作者：
Cook, Sarah E.;Conway, Kim W.;Burd, Brenda
本文描述了加拿大不列颠哥伦比亚省格鲁吉亚盆地海绵礁的现状和区系组成。14个不同的深水玻璃海绵（Hexactinellid）珊瑚礁已被映射使用多波束测深和侧扫声纳在GB。其中7个已经使用遥控潜水器的视频进行了目视调查。对视频数据的分析表明，三个珊瑚礁没有受到损害。其中两个受损，另外两个受损，但可能正在恢复。受损珊瑚礁的性质-大面积散布着死去的海绵骨架碎片，很少有活的造礁海绵（Aphrocalphus vastus和Heterochone calyx）-以及痕迹的录像证据表明，它们是被移动的渔具机械损坏的。与珊瑚礁有关的巨型动物的相对丰度在海洋学条件的背景下进行了讨论，如沉积物积累和有机通量，以及整体的珊瑚礁状况。对该地区渔业保护工作特别感兴趣的是，GB南部一个未受破坏的珊瑚礁显示出较高的分类丰富度和岩鱼丰度，无论是成年人还是幼年人，与邻近的受损珊瑚礁相比。这一结果表明，未受损的珊瑚礁可能可以作为这些濒危种群的避难所。(C)2008爱思唯尔有限公司保留所有权利。
The purpose of this paper is to describe the status and general faunal composition of sponge reefs in the Georgia Basin (GB), British Columbia, Canada. Fourteen distinct deep-water glass sponge (Hexactinellid) reefs have been mapped using multibeam bathymetry and sidescan sonar in the GB. Seven of these have been surveyed visually using video from remotely operated vehicles (ROVs). Analysis of video data indicated that three reefs were undamaged. two were damaged and the other two were damaged but potentially recovering. The nature of the damaged reefs, with large areas of scattered dead sponge skeleton fragments and few live reef-building sponges (Aphrocallistes vastus and Heterochone calyx), as well as video evidence of tracks suggest they were damaged mechanically by mobile fishing gear. Relative abundance of the megafauna associated with the reefs is discussed in the context of oceanographic conditions, such as sediment accumulation and organic flux, as well as overall reef status. Of particular interest for fisheries conservation efforts in the area was the fact that one undamaged reef in the southern GB showed higher taxonomic richness and abundance of rockfish (Sebastes spp.), both adult and juvenile, compared to an adjacent damaged reef. This result Suggests that undamaged reefs may act as refugia for these endangered stocks. (C) 2008 Elsevier Ltd. All rights reserved.