Boreskov

PP‐62investigation of dietary patterns and trophic relationships of tardigrades with stable isotopes(δ 15 N; δ 13 C). It is important to know, if the food web concept works on this harshenvironment as well. Also the ability to form a tun is investigated. Tardigrades are wellknown as model organisms for astrobiology due to their high ability to adapt to most hostileconditions which could be prevailing on other exoplanets.References[1]. Crowe, J.H. 1975: The physiology of cryptobiosis in tardigrades. Mem. Ist. Ital. Idrobiol. 32 (Suppl.), 37–59.[2]. Crowe, J.H. and Madin, K.A.C. 1974: Anhydrobiosis in tardigrades and nematodes. Trans. Am. Micros.Soc. 93, 513–524.[3]. Crowe, J.H. 1972: Evaporative water loss by tardigrades under controlled relative humidity. Biol. Bull.142:407–416.[4]. Dastych H., Kraus H. und Thaler K. 2003: Redescription and notes on the biology of the glacier tardigradeHypsibius klebelsbergi Mihelčič, 1959 (Tardigrada), based on material from the Ötztal Alps. Austria. Mitt.hamb. zool. Mus. Inst., Band 100, S. 73 – 100[5]. De Smet,W.H., Van Rompu,E.A., and Beyens,L. 1988. Contribution to the rotifers and aquatic Tardigradaof Edgeoya (Svalbard). Fauna norv. Ser.A 9:19‐30.[6]. Horikawa DD, Kunieda T, Abe W, Watanabe M, Nakahara Y, et al. 2008: Establishment of a rearingsystem of the extremotolerant tardigrade Ramazzottius varieornatus: a new model animal forastrobiology. Astrobiology 8: 549–556 CrossRef, PubMed.[7]. Greven, H., Dastych, H. & Kraus, H. 2005: Notes on the integument of the glacier‐dwelling tardigradeHypsibius klebelsbergi Mihelcic, 1959 (Tardigrada). Mitteilungen aus dem Hamburgischen ZoologischenMuseum und Institut, 102: 11‐20.[8]. Jönsson, K.I. and Bertolani, R. 2001: Facts and fiction about long‐term survival in tardigrades. J. Zool. 255,121–123.[9]. Kinchin, I. M. 1994: The Biology of Tardigrades. Portland Press Ltd., London 1994[10]. Kraus, H. 1977: Hypsibius (Hypsibius) klebelsbergi Mihelčič, 1959 (Tardigrada) aus dem Kryokonit desRotmoosfernes. — Institut für Zoologie der Universität Innsbruck, unpublished PhD Thesis, 189 pp.[11]. McInnes, S.J. & P.J.A. Pugh: 1998: Biogeography of limnoterrestrial Tardigrada, with particular referenceto the Antarctic fauna. J. Biogeogr., 25: 31‐36.[12]. Margesin & Schinner 1999: Cold adapted Organisms, Ecology, Physiology, Enzymology and MolecularBiology. Springer Verlag[13]. Ramazzotti G, W Maucci. 1983: Il Phylum Tardigrada. Mem.Inst. Ital. Idrobio Pallanza 41: 1‐1012.[14]. Somme,L. 1996: Anhydrobiosis and cold tolerance in tardigrades. Eur.J.Entomol. 93:349‐357.243