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首页> 外文期刊>Marine ecology progress series >High resolution mapping of community structure in three glass sponge reefs (Porifera, Hexactinellida)
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High resolution mapping of community structure in three glass sponge reefs (Porifera, Hexactinellida)

机译：高分辨率绘制三个玻璃海绵礁（Porifera，Hexactinellida）中群落结构的图

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Glass sponge reefs (Porifera, Hexactinellida) are unique to the Pacific coast of Canada. To date, the locations and extents of reefs have only been assessed by multibeam echosounders, a method that does not resolve where live, dead and buried sponges are within a reef. We performed fine-scale (25 and 12.5 m grids) photographic surveys using remote operated vehicles and carried out GIS and semivariogram analysis to produce high resolution maps of the spatial distribution and abundance of glass sponges among 3 reefs in the Strait of Georgia and also to determine the community structure of animals associated with the reefs. Within a reef, glass sponges are clustered in spatially dependent patches 35 to 72 m in diameter, which we interpret to result from growth and reproduction processes. Reefs occur within a narrow range of depths (30 to 50 m), which may be explained by suspension feeding requirements for flow, which is accelerated over the underlying elevated bedrock mounds and ridges. The local abundance of fish and crustaceans was significantly higher in the presence of glass sponges while significantly lower abundances of molluscs and other sponges were found within the reefs. Also, we determined that a dense population of reef sponges can process water at 83 000 l s~(-1), removing carbon at a rate of 0.96 g C m~(-2) d~(-1). Our high resolution mapping establishes a biological baseline for 3 glass sponge reefs in the Strait of Georgia.
机译：玻璃海绵礁（Porifera，Hexactinellida）是加拿大太平洋海岸特有的。迄今为止，珊瑚礁的位置和范围仅由多波束回声测深仪进行了评估，这种方法无法解决珊瑚礁中活海绵，死海绵和埋藏海绵的位置。我们使用远程操作车辆进行了小规模（25和12.5 m网格）的摄影调查，并进行了GIS和半变异函数分析，以生成高分辨率的地图，这些地图显示了乔治亚海峡以及3个珊瑚礁之间的玻璃海绵的空间分布和丰富度。确定与珊瑚礁相关的动物的群落结构。在珊瑚礁中，玻璃海绵聚集在直径为35至72 m的空间相关斑块中，我们认为这是生长和繁殖过程的结果。礁石出现在很窄的深度范围（30至50 m）内，这可以用流动的悬浮物进料需求来解释，该需求在下伏升高的基岩土丘和山脊上加速。在玻璃海绵的存在下，鱼类和甲壳类动物的局部丰度明显较高，而在珊瑚礁内发现的软体动物和其他海绵的丰度则明显较低。此外，我们确定了密集的礁石海绵可以处理83 000 l s〜（-1）的水，并以0.96 g C m〜（-2）d〜（-1）的速率去除碳。我们的高分辨率制图为佐治亚州海峡的3个玻璃海绵礁建立了生物基线。

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