Bromeliothrix metopoides,a boom and bust ciliate (Ciliophora,Colpodea) from tank bromeliads |
| |
Authors: | Thomas Weisse Ulrike Scheffel Peter Stadler Wilhelm Foissner |
| |
Institution: | 1. University of Innsbruck, Research Institute for Limnology, Mondsee, Austria;2. University of Salzburg, Department of Organismic Biology, Salzburg, Austria |
| |
Abstract: | We investigated the recently described colpodid ciliate Bromeliothrix metopoides in a series of laboratory experiments to reveal the environmental factors that constrain this species to its peculiar habitat, i.e. the tanks of bromeliads. Our results demonstrated that the various life stages of this ciliate (bacterivorous theronts and microstome trophonts, flagellate-feeding macrostomes) have specific demands in terms of food quality and quantity. Bromeliothrix required a high food threshold (>1.4 mg C L?1) in order to thrive. Food quality also affected resting cyst formation of B. metopoides when the experimental containers dried out. Its maximum growth rates (μmax = 4.71 d?1, i.e. 6.8 doublings d?1) belong to the highest ones recorded thus far for free-living ciliates. The pH niche of B. metopoides was relatively wide (pH ~4 to >9) under optimal food conditions. However, its high sensitivity to unfavourable environmental conditions let the population collapse within several hours. We conclude that B. metopoides is a boom and bust ciliate that is specifically adapted to its peculiar habitat but virtually unviable in other environments. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|