title: Bromeliothrix metopoides, a boom and bust ciliate (Ciliophora, Colpodea) from tank bromeliads.
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 CL(-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.
authors.affiliation: University of Innsbruck, Research Institute for Limnology, Mondsee, Austria. thomas.weisse@uibk.ac.at
authors.forename: Thomas
authors.initials: T
authors.lastname: Weisse
authors.forename: Ulrike
authors.initials: U
authors.lastname: Scheffel
authors.forename: Peter
authors.initials: P
authors.lastname: Stadler
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Foissner
mesh_terms: D031231:Bromelia / Q000469:parasitology*; D016798:Ciliophora / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D006863:Hydrogen-Ion Concentration; D014867:Water / Q000737:chemistry; D014871:Water Microbiology
chemical_list: D014867:Water
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