水螅摄食中的特殊行为

取经中性红活染后的杆吻虫喂水螅,仔细观察了水螅的摄食行为.结果表明,水螅垂唇端部能够相互识别出同类;水螅的垂唇与胃区能协力把杆吻虫吞入胃腔,触手经常随食物进入胃腔;吞食时经常出现头部内翻或外翻;个体间及其成体与芽体间常出现争夺食物的现象,当垂唇端部互不相触时,体型较大的个体常常把较小个体或芽体连同食物一起吞食;垂唇内胚层腺细胞对食物有消化作用,对同类无伤害;水螅的神经系统已有初步的整合功能.

The Feeding Behavior of Hydra peseudoligactis

The Feeding behaviors were observed by microscopy when the Hydra peseudoligactis was grazed by the Stytaris fossularis dyed by neutral red. It is found that inter-boundary cell between Hydras had the function of distinguishing each other. The phagocytosis of Hydra was taken under the coordinating hypostone with stomach-range tissue.The stomach-range tissue was able to dilate laraely and produce strong absorbing force when Hydra swallowed foods, and the head of Hydra was absorbed into stomach with Stytaria fossularis sometimes, the tentacle also was absorbed into the stomach with foods. The seizing foods behavior always was found between Hydras or Hydra and bud with foods, the bigger Hydra often swallowed smaller one or buds with foods. The gladn cell in entodem of hypostome was able to digest foods,but it had no hurt effect to other Hydra. This paper also takes a discussion on some specially feeding behaviors of Hydra.