Shifting feeding behaviour of deep-sea buccinid gastropods at natural and simulated food falls
Shifting feeding behaviour of deep-sea buccinid gastropods at natural and simulated food falls
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DOI：
10.3354/meps09758
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发表时间：
2012-01-01
影响因子：
2.5
通讯作者：
Fujiwara, Y.
中科院分区：
文献类型：
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作者：
Aguzzi, J.;Jamieson, A. J.;Fujiwara, Y.
深海是一个低食物投入的环境，因此从表层水中大量落下的食物对于支持丰富的深海食腐动物很重要。由于这些事件的不可预测性和短暂性质，观察到这些事件的概率非常低。安装在相上湾(1100米深；日本中部)冷渗漏蛤场内的有线天文台的视频系统记录了一次罕见的事件。我们观察到一条死在镜头前的鱼，在活着的时候，立即被约氏滑鼠(Buccinum Yoroianum)(新腹足纲：滑鼠亚科)捕捉和捕食。多达76只大蜗牛对鱼有反应，在大约8h内吃掉身体，没有十足类甲壳类动物的干预。只有少量的鳗鱼参与其中。为了进行比较，我们报告了太平洋不同区域和深度的补充调查结果。这些观测是由模拟食物坠落的有诱饵的相机着陆器记录下来的。在6h内，水母Tacita zenkevitchi聚集在诱饵上，与鱼类竞争。这些观察证实，深海乌贼可以在主动捕食和觅食之间改变它们的觅食行为。然而，我们的感知似乎受到我们使用的观测方法的制约：当使用摄影技术(例如，由有诱饵的着陆器)及时拍摄单张快照时，八哥鱼可能看起来像食腐动物，或者当在自然环境中观察并用有线天文台连续拍摄时，可能看起来像捕食者。
The deep sea is a low food input environment, hence large food falls from the surface waters are important in supporting a wealth of scavenging deep-sea fauna. The probability of observing such events is very low, due to their unpredictable and short-lived nature. The video system of a cabled observatory installed within a cold seep clam field in Sagami Bay (1100 m depth; Central Japan) recorded a rare event. We observed a fish dying directly in front of the camera and being immediately perceived and preyed upon by Buccinum yoroianum (Neogastropoda: Buccinidae), while still alive. Up to 76 large snails responded to the fish and consumed the carcass within similar to 8 h, with no intervention by decapod crustaceans. There was only small participation of eelpouts (Zoarcidae). For comparison, we report on supplementary findings from a different area and depth of the Pacific Ocean. These observations were recorded by a baited camera lander which simulated a food fall. Within 6 h, the buccinid Tacita zenkevitchi aggregated on the bait, competing with fishes. These observations confirm that deep-sea buccinids can shift their feeding behaviour between active predation and scavenging. Our perception, however, seems conditioned by the observational methodology we use: buccinids may appear as scavengers when using photography (e. g. by baited landers) producing single snapshots in time, or as predators when observed in a natural setting and video-taped continuously with a cabled observatory.