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Abstract	Understanding the factors and the underlying mechanisms that constitute the diversity gradient, as well as further research on the relationship between diversity and ecosystem function are current issues in ecology, that are intended to clarify the theories affiliated with the variety of life. One of the main hypotheses towards this direction is the energy hypothesis, according to which energy plays an important role in determining species richness, especially at the regional level (e.g. Wright et al. 1993, Huston 1994, Mittelbach et al. 2001). When dealing with a landscape scale the measure used for the estimation of energy is productivity, which describes the rate of energy flux through food webs in an ecosystem, and represents an ecosystem function. The relationship between species richness and productivity, although sufficiently studied at the local scale, remains a relatively unknown field of research when it comes to spatial scales greater than the size of a sample unit. This study, concerning the island of Crete, examines the relationship between species richness and productivity at the landscape scale with the use of GIS and regression models. Finally, we come to the conclusion that, in reference to the results that were produced, that productivity is not a prominent factor for the control of species richness in Crete and that this relationship is in fact determined by other factors, such as water-energy dynamics and habitat heterogeneity.
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Chatzigoga C	Μεταπτυχιακό Πρόγραμμα Σπουδών, Περιβαλλοντική Πολιτική και Διαχείριση του Τμήματος Περιβάλλοντος του Πανεπιστημίου Αιγαίου			1