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David T. Gay,András I. Stipsicz/or trophic interactions. Indeed, species’ distributions in arctic ecosystems are quite sensitive to the environmental parameters expected to change in northern ecosystems such as temperature (Chapin and Shaver 1985b; Havstrom et al. 1993), hght (op cit.), nutrient availability (Chapin and Shaver 19

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Dan Friedmanie- ments in the field of databases and information systems. ADBIS 2008 aimed to create conditions for experienced researchers to impart their knowledge and exp978-3-540-85712-9978-3-540-85713-6Series ISSN 0302-9743 Series E-ISSN 1611-3349

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