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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Oceanographic habitat of sponge reefs on the western Canadian Continental Shelf
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Oceanographic habitat of sponge reefs on the western Canadian Continental Shelf

机译：加拿大西部大陆架上的海绵礁海洋学栖息地

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This paper describes oceanographic conditions in which siliceous (Hexactinellida, Hexactinosida) sponge reefs thrive near the heads of shelf canyons on the west coast of Canada. Unique in the present world ocean, these colonies consist of mounds (bioherms) up to 21 m in height and beds (biostromes), which extend for tens of kilometers at depths between 140 and 240 m. The relaxation of winter downwelling and occasional weak summer upwelling enhances northward up-canyon intrusions of nutrient rich bottom waters in Hecate Strait. As bottom waters cross the shelf, they are further enriched with nutrients and depleted in oxygen by remineralization processes. Silicate concentrations in waters around sponge reefs are thus enhanced during what is likely the sponge's main growing season. Bottom waters in the vicinity of the sponge reefs contain 43-75 muM silicate and 64-152 muM dissolved oxygen, and have a temperature range of 5.5-7.3 C and a salinity range of 33.2-34.2. Canyons harbouring the sponge reefs provide a means of concentrating particulate material that the sponges can use to enrich their habitat. Detrital rain supplies particulates to canyons in what appears to be tidally modulated pulses. Particulate material entrained in near bottom currents has a residence time of approximately 6 days in contact with the largest sponge reef and is effectively trapped by sponges, which enhances mound construction. A simple budget of Si uptake by the 425 km(2) area of the northern sponge reef shows that it has slight impact on the Si budget of this region. Scour by the similar to25 cm s(-1) bottom tidal currents eliminates sediment accumulation on the reefs and the surrounding seabed. (C) 2004 Elsevier Ltd. All rights reserved.
机译：本文介绍了海洋条件，其中在加拿大西海岸的层架峡谷顶部附近，硅质（六角形，六角形）海绵礁繁盛。这些殖民地在当今世界海洋中是独一无二的，由高达21 m的土丘（生物hermes）和床（biostrom）组成，其深度在140至240 m之间延伸数十公里。冬季下降流的松弛和夏季偶尔的弱流增强了海卡特海峡海域北向峡谷的养分丰富的底水的入侵。随着底水越过底架，它们会进一步富集营养，并通过再矿化过程消耗氧气。因此，在海绵的主要生长季节中，海绵礁周围水中硅酸盐的浓度会增加。海绵礁附近的底水包含43-75μM的硅酸盐和64-152μM的溶解氧，温度范围为5.5-7.3 C，盐度范围为33.2-34.2。拥有海绵礁的峡谷提供了一种浓缩颗粒物质的方式，海绵可以利用这些物质来丰富其栖息地。碎屑雨以似乎是潮汐调制脉冲的形式向峡谷提供了微粒。与最大的海绵礁接触时，夹带在接近底部的水流中的颗粒物质的停留时间约为6天，并被海绵有效地捕获，从而增强了土堆的结构。北部海绵礁425 km（2）区域的Si吸收预算很简单，表明它对该地区的Si预算影响很小。通过类似于25 cm s（-1）的底潮冲刷，可以消除沉积物在礁石和周围海床上的积聚。 （C）2004 Elsevier Ltd.保留所有权利。

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