From sampling stations to archipelagos: investigating aspects of the assemblage of insular biota

• DOI: 10.1111/j.1466-882x.2004.00065.x
• Publication Date: 2004-01-09T09:58:11Z
• Authors: Spyros Sfenthourakis; Sinos Giokas; Evangelos Tzanatos
• Keywords: Nestedness; Archipelago; Biota

ABSTRACT Aim To investigate the formation of nestedness and species co‐occurrence patterns at local (sampling station), intermediate (island group), archipelago scale. Location The study used data on distribution terrestrial isopods 20 islands central Aegean (Greece). These are assigned to two distinct subgroups (Kyklades Eastern islands). Methods Nestedness Temperature Calculator was obtain values maximally nested matrices, EcoSim7 software a modified version Sanderson (2000 ) method were for analysis co‐occurrences. Idiosyncratic temperatures order placement in matrices further comparisons among spatial scales. relationships with beta‐diversity, habitat diversity number ecological factors recorded each sampling station also investigated. Results Significant found all Levels not related beta‐diversity or diversity. similar scales, but they affected by matrix size. that contributed most within single same as those produce There significant variation frequency occurrence no direct effect shaping individual islands, heterogeneity crucial existence such patterns. Positive associations prevailed scales when per considered, while negative island matrices. All resulted from structure stations particularities geographical distributions. Conclusions clear‐cut distinction between even though different species, partially factors, these case. core suggested biotic interactions an important causal factor. results this suggest locally rare cannot be widespread higher scale, common can have restricted distribution.