Impact of olive grove management on spider (araneae) community in Northwestern Turkey

Elverici, Mert
Olive (Olea europea) plantations cover vast areas on the Aegean coast of Turkey, including the southern foothills of Kaz Mountains. In such environments, olive trees dominate the terrestrial vegetation in such a way that they might form a novel ‘ecosystem’. The ‘olive grove agro-ecosystem’ is shaped by agricultural management while impacts on biodiversity are largely unknown. As representatives of local biodiversity, spider communities were sampled in soil and vegetation microhabitats, alongside with various environmental variables linked to management or habitat features in organic and conventional olive groves, and in relict patches of natural habitats. 278 spider species from 20,167 specimens and >300 sampling units were collected and standardized by effort. Data obtained were analyzed by using multivariate statistics to interpret associations within the community (NMDS, CCA, RDA models) and by diversity statistics (ANOVA, ANOSİM and permutation tests). Community composition and diversity differed by habitat type (moist or dry grove, maquis, pine and mixed forests) and microhabitat (soil, herb and canopy). Olive groves and mixed forests had richer communities compared to maquis and pine patches. Soil microhabitats were more species rich and diverse than herb or canopy layers. Difference between “organic” or “conventional” management types could not be detected at the community level, whereas impact of soil management (tillage and herbicides) and vegetation cover (tree, shrub or herb cover) were significant on the spider community. Our results may serve as evidence for community composition - environment relationship for spider communities, and help towards more naturefriendly olive grove management in the region.


Drivers of Spider (Arachnida:Araneae) Biodiversity in an ‘Olive Grove Ecosystem’ in North-Western Anatolia (Çanakkale and Balıkesir, Turkey)
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Olive plantations cover vast areas on the Aegean coast of Turkey, and the southern foothills of Kaz Mountains is no exception. Olive trees dominate the terrestrial vegetation to such an extent that they form anovel ‘ecosystem’. The olive grove ecosystem is shaped by agricultural management, while impacts on biodiversity are largely unknown. We sampled spider communities living on soil surface and vegetation (understory herbaceous & tree canopy) microhabitats, alongside with various environmental variables ...
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The Spider of an olive grove and associated shrublands in Muğla, Milas, Kıyıkışlacık with notes on their diversity and composition
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In the period from May 2010 to August 2011, spider fauna of semi natural olive groves and associated shrub-lands were sampled in Muğla Province, Milas District, Kıyıkışlacık Village at the Western Mediterranean coast of Turkey. Semiquantitative sampling protocols were performed by use of pitfall traps, sweep nets, by active collecting, by sifting of tree litter and beating branches of shrubs. A total of 9967 spider specimens were obtained, from these, 3034 adult specimens were determined up to the lowest ta...
Citation Formats
M. Elverici, “Impact of olive grove management on spider (araneae) community in Northwestern Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2018.