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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The influence of flow velocity and temperature on zooplankton capture rates by the cold-water coral Dendrophyllia cornigera
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The influence of flow velocity and temperature on zooplankton capture rates by the cold-water coral Dendrophyllia cornigera

机译：流速和温度对冷水珊瑚角毛树Dendrophyllia cornigera浮游动物捕获率的影响

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摘要

Food supply is one of the main factors driving cold-water corals (CWC) distribution, which often concentrate on ridges where local near-bed turbulence/strong currents enhance food availability. However, efficiency in food capture is strongly dependent on current velocity. Moreover, seawater temperature may also affect feeding success, since polyp contraction or nematocyst function could be slower at temperatures below the natural thermal range of a species. The non-reef forming CWC Dendrophyllia cornigera occurs in areas at temperatures from 11 to 17 degrees C, but is apparently absent from most CWC reefs at temperatures constantly below 11 degrees C. This study thus aimed to assess if a reduction in feeding capacity may contribute to understand the absence of this CWC from strictly cold environments. The efficiency of D. cornigera to capture meso- and macrozooplankton was assessed under different flow speeds (2,5 and 10 cm s(-1)) and temperatures (8, 12, and 16 degrees C). Flow speeds did not significantly affect the capture of mesozooplankton, whereas capture of macrozooplankton was significantly enhanced with increasing flow speed. Both meso- and macrozooplankton captures were not significantly affected by temperature in D. comigera. Overall, this CWC species is efficient in capturing zooplanIcton under a larger range of flow velocities than the widespread CWC Lophelia pertusa, whose capture efficiency significantly decreased from low to high flow speeds. Even if temperature does not directly affect the capture rates of D. comigera, it may still influence the feeding capacity of this CWC since the capture rates at 8 degrees C were always in the lowest range of the observed values at each flow speed, and corals maintained at 8 degrees C required a much longer time to fully expand their polyps once they were placed in the incubation chambers, than corals maintained at 12 and 16 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
机译：粮食供应是推动冷水珊瑚（CWC）分布的主要因素之一，冷水珊瑚通常集中在山脊上，当地的近床湍流/强流增强了食物的供应。但是，食物捕获的效率很大程度上取决于当前的速度。此外，海水温度还可能影响摄食成功，因为在低于物种自然热力范围的温度下息肉收缩或线虫囊功能可能变慢。非珊瑚礁形成的CWC绿毛树毛发生在温度介于11到17摄氏度之间的区域，但是在温度不断低于11摄氏度的情况下，大多数CWC珊瑚礁显然不存在。了解在严寒环境中是否缺少这种CWC。在不同的流速（2,5和10 cm s（-1））和温度（8、12和16摄氏度）下评估了角毛衣藻捕获中观浮游动物和大型浮游动物的效率。流速对中卵浮游动物的捕获没有显着影响，而随着流速的增加，巨浮游动物的捕获显着增强。中线和大型浮游动物的捕获都没有受到温度的显着影响。总体而言，这种CWC物种比广泛分布的CWC Lophelia pertusa在更大的流速范围内可有效捕获浮游动物，后者的捕获效率从低流速到高流速均显着降低。即使温度不直接影响小金毛蟹的捕获率，也可能会影响该CWC的进食能力，因为在8摄氏度下，捕获率始终在每种流速下都处于观测值的最低范围内，而珊瑚珊瑚保持在8摄氏度时，将息肉完全放入孵化室所需的时间要比保持在12摄氏度和16摄氏度的珊瑚更长的时间。（C）2015 Elsevier BV保留所有权利。

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