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首页> 外文期刊>Frontiers in Marine Science >Influence of Deep-Water Corals and Sponge Gardens on Infaunal Community Composition and Ecosystem Functioning in the Eastern Canadian Arctic
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Influence of Deep-Water Corals and Sponge Gardens on Infaunal Community Composition and Ecosystem Functioning in the Eastern Canadian Arctic

机译：深水珊瑚和海绵园区对加拿大北极地区招聘社区成分及生态系统运作的影响

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The relationships between infaunal diversity and ecosystem function of biogenic structures in the Eastern Canadian Arctic remain poorly documented. Our study investigated the influence of sponge gardens at the Frobisher Bay site (138 m) and bamboo corals at the Baffin Bay site (1007 m) on the infaunal community structure and benthic ecosystem functioning. The occurrence of both types of biogenic structure type enhanced particular taxa and/or feeding guilds. A large density of suspension filter feeders was observed in bamboo coral sediment, whereas bare sediment exhibited a large proportion of nematodes and deposit-detritus feeders. Sponge gardens’ sediment showed a high proportion of isopods, Paraonidae polychaetes and up/down conveyors whereas bare sediment exhibited a large density of filter feeders. Through incubation cores, we measured ex-situ benthic nutrient and oxygen fluxes at the sediment-water interface in each habitat and site. Biogeochemical fluxes varied significantly between habitats in the Baffin Bay site with a significant impact of bamboo coral habitat on nutrient fluxes (nitrate, ammonium and silicate). Surprisingly, the sediment hosting bamboo corals acted as a source of nitrate and ammonium reaching values similar or higher to the Frobisher site despite the difference in water depth, and thus food supply between the two sites. These significant releases could derive from (i) a high organic matter deposition in bamboo coral habitat, allowed by their erected structure, (ii) a high efficiency of bioturbators (surficial modifiers and burrowers) mixing the surface layer of the sediment and (iii) the difference in sediment type. Our study highlighted that, compared to its adjacent habitat, the presence of bamboo corals appeared to enhance the infaunal density and nutrient release of its sediment. In contrast, the impact of sponge gardens was not as clear as for bamboo coral habitat, likely due to the relatively significant presence of megabiota in the sponge garden adjacent habitat. Thus, our results based on a relatively small sample size, indicate that the bamboo coral habitat seems to increase the efficiency of deep-benthic ecosystem functioning, while that of sponge garden on the shallow ecosystem functioning remains uncertain.
机译：加拿大北极东部生物结构的禁令多样性和生态系统函数的关系仍然不足。我们的研究调查了在杂丁湾网站（1007米）的Frobisher海湾网站（138米）和竹珊瑚上的海绵花园对婴儿群落结构和底栖生态系统运作的影响。两种类型的生物结构型增强特定的征集和/或喂养公会的发生。在竹珊瑚沉积物中观察到大密度的悬浮滤网器，而裸沉积物表现出大部分线虫和沉积物饲养剂。海绵花园的沉积物表现出高比例的异泡，副糖苷，多重输送机，而裸沉积物表现出大密度的过滤喂料器。通过孵化核心，我们在每个栖息地和部位的沉积物 - 水界面测量ex原位底栖营养素和氧气通量。生物地球化学助势在葡萄干海湾部位的栖息地之间有显着变化，具有竹珊瑚栖息地对营养助熔剂（硝酸盐，铵和硅酸盐）的影响。令人惊讶的是，尽管水深的差异，但是两位地点之间的食物供应，沉积物托管竹珊瑚占竹珊瑚的源于硝酸盐和铵达到的值，而且达到了Frobisher网站。这些重要版本可以从（i）竹珊瑚栖息地的高有机物质沉积，其竖立的结构允许（ii）在混合沉积物表面层和（III）的表面层的高效率和（曲面改性剂和挖掘机）沉积物类型的差异。我们的研究强调，与其相邻的栖息地相比，竹珊瑚的存在似乎增强了其沉积物的婴儿密度和养分释放。相比之下，海绵花园的影响与竹珊瑚栖息地不那么清楚，可能是由于海绵园栖息地在海绵花园中的相对显着存在。因此，我们的结果基于相对较小的样品尺寸，表明竹珊瑚栖息地似乎提高了深底底生态系统功能的效率，而海绵花园的浅层生态系统功能仍然不确定。

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