Intraspecific selectivity, compensatory feeding and flexible homeostasis in the phagotrophic flagellate Oxyrrhis marina: three ways to handle food quality fluctuations
Intraspecific selectivity, compensatory feeding and flexible homeostasis in the phagotrophic flagellate Oxyrrhis marina: three ways to handle food quality fluctuations
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DOI：
10.1007/s10750-011-0900-4
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发表时间：
2012-01-01
期刊：
影响因子：
2.6
通讯作者：
Boersma, Maarten
中科院分区：
文献类型：
--
作者：
Meunier, Cedric Leo;Hantzsche, Florian M.;Boersma, Maarten
摄食鞭毛虫Oxyrrhis marina表现出很强的化学计量可塑性时，喂养不同生长的Rhodium salina。我们测试了不同预处理的O。marina对氮磷耗竭的R. salina。我们观察到O. marina，总是选择富磷的R. salina独立的原生生物的预处理。在第二个实验中，O. marina再次用氮或磷耗尽的R. salina，分别用不同限制性的R.盐藻在单一的食物处理（而不是在混合物）。该鞭毛虫表现出补偿性摄食，即O. marina饲料更多的食物来源，他们没有给之前。O.玛丽娜可能会处理质量差的食物，根据其猎物的化学计量，并另外通过积极的选择性喂养对富磷藻类，以促进生长。摄入后选择也可能是一个重要的特征，这意味着摄入过量的元素被迅速排出体外，而稀缺的元素则通过加速食物吸收而被摄入。
The phagotrophic flagellate Oxyrrhis marina shows a strong stoichiometric plasticity when fed differently grown Rhodomonas salina. We tested whether differently pre-conditioned O. marina displayed selective feeding behaviour from a mixture of nitrogen and phosphorus depleted R. salina. We observed selective feeding of O. marina, always selecting phosphorus rich R. salina independent of the pre-conditioning of the protists. In a second experiment, O. marina was again pre-conditioned either with nitrogen-or phosphorus-depleted R. salina and was refed with either of the differently limited R. salina in single food treatments (not in a mixture). The phagotrophic flagellate displayed compensatory feeding which means that O. marina feed more on the food source which they were not given before. Due to its stoichiometric plasticity, O. marina might handle bad quality food by following the stoichiometry of its prey and additionally by active selective feeding towards P-rich algae to enhance growth. Post-ingestion selection might as well be an important feature which means that ingested elements in excess are quickly excreted and scarce elements are ingested through accelerated food uptake.