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Plant Biol (Stuttg) 2006; 8(6): 849-860
DOI: 10.1055/s-2006-924474
Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Development of Microalgae Communities in the Phytotelmata of Allochthonous Populations of Sarracenia purpurea (Sarraceniaceae)

C. Gebühr1 , E. Pohlon1 , A. R. Schmidt1 , [2] , K. Küsel1
  • 1Limnology Research Group, Institute of Ecology, Friedrich Schiller University, Carl-Zeiss-Promenade 10, 07745 Jena, Germany
Further Information

Publication History

Received: December 1, 2005

Accepted: June 18, 2006

Publication Date:
25 October 2006 (online)

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Abstract

The phytotelmata of the North American pitcher plant Sarracenia purpurea are colonised by a great variety of aquatic organisms and, thus, provide an ideal model to study trophic interactions in small freshwater ecosystems. Although algae are discussed as a potential food source for predators, little is known about the structure of algae coenoses in pitchers of S. purpurea. This study aims to elucidate temporal shifts in the algae community structure in pitchers of an allochthonous population of S. purpurea in Saxony, Germany. A total of 78 algae taxa was found in the pitchers. Mean algae abundances in new and old pitchers were similar (2.6 × 105 and 2.3 × 105 algae ml-1, respectively). Taxa from the orders Chlamydomonadales, Chlorococcales, and Ochromonadales were the primary colonisers. With increasing age of the pitchers the filamentous green algae from the order Klebsormidiales became more abundant. In contrast, pennate diatoms dominated the algae coenoses in the fen. Algae community structure in vase-shaped 50 ml Greiner tubes was similar to those of natural pitchers. Differences in the temporal patterns of algae coenoses in individual pitchers suggested a colonisation of the pitchers by algae via trapped insects, air and rain water rather than via the surrounding fen. Biomass of algae approximated 0.3 mg C ml-1, which corresponds to 82.8 % of the living biomass (bacteria, heterotrophic nanoflagellates, algae, protozoans and rotifers). Rotifers were abundant in new pitchers; nematodes and mites were seldom found in all pitchers. A similar qualitative and quantitative composition of the aquatic biocoenoses was observed in pitchers of another allochthonous S. purpurea population growing in Blekinge, Sweden. Biomass of algae represented nearly one quarter of the total organic matter content in the pitchers. Thus, nitrogen and phosphorus compounds present in the algae biomass might be used by the carnivorous S. purpurea plant as additional food source in allochthonous populations in Europe lacking top predators.

Key words

Algae - carnivorous plants - phytotelmata - pitcher plant inquiline communities - Sarracenia purpurea.

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1 Present address: Museum für Naturkunde der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany

K. Küsel

Limnology Research Group
Institute of Ecology
Friedrich Schiller University Jena

Carl-Zeiss-Promenade 10

07745 Jena

Germany

Email: kirsten.kuesel@uni-jena.de

Guest Editor: S. Porembski