PATTERNS OF WHOLE COLONY PREY CAPTURE IN THE OCTOCORAL, ALCYONIUM SIDERIUM.
PATTERNS OF WHOLE COLONY PREY CAPTURE IN THE OCTOCORAL, ALCYONIUM SIDERIUM.
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八珊瑚 Alcyonium Siderium 中整个群体捕获猎物的模式。
DOI：
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发表时间：
1984
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影响因子：
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通讯作者：
M. Patterson
中科院分区：
文献类型：
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作者：
M. Patterson
北方八珊瑚（Alcyium sideium）的群落会在一定的低湍流流速下优先捕捉群落特定区域的猎物。在低流量条件下（2.5 cm·s-1），以丰年虾包囊为食的群体优先捕获群体上游侧的猎物。在中等流速（9.0 cm·s-1）下，猎物捕获均匀分布在群体周围，而在较高流速（19.0 cm·s-1）下，猎物捕获再次变得不对称，下游息肉捕获最多猎物。在自由流湍流水平较高时，群体周围这些不对称的猎物捕获分布消失了；在垂直方向上，在所有测试的流速下，群体表面上的猎物捕获都是不对称的，靠近群体顶部的息肉仅在最低速度下捕获最多的猎物。不对称过滤的原因是：（1）随着流速的增加，水螅体的机械变形增加到不利于捕获猎物的方向，以及（2）下游方向群体边界层中猎物浓度的差异。对于非运动颗粒，这种被动悬浮进料器的过滤性能似乎仅受流速和湍流、过滤元件的机械行为以及菌落边界层中颗粒的运动的控制。
Colonies of a boreal octocoral, Alcyonium siderium, preferentially catch prey on specific regions of the colony at certain flow speeds of low turbulence. Colonies feeding on brine shrimp cysts capture prey preferentially on the upstream side of the colony under low flow conditions (2.5 cm · s-1). At intermediate flow speeds (9.0 cm · s-1), prey capture is uniformly distributed around the circumference of the colonies, while at higher flow speeds (19.0 cm · s-l), prey capture again becomes asymmetric and downstream polyps capture the most prey. At higher levels of free-stream turbulence, these asymmetric prey capture distributions around the colony disappear; in the vertical direction, prey capture is asymmetric over the surface of the colony at all flow speeds tested, with polyps nearer the top of the colony capturing the most prey only at the lowest speeds. Asymmetrical filtration results from (1) increasing mechanical deformation of polyps into an orientation unfavorable for prey capture with increasing flow speed, and (2) differential prey concentrations in the boundary layer of the colony in the downstream direction. For non-motile particles, the filtration performance of this passive suspension feeder appears governed only by the flow speed and turbulence, the mechanical behavior of the filter elements, and the motion of the particles in the boundary layer of the colony.