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Ben-Gurion University of the Negev (2021)

A network approach for analyzing arthropod diversity and habitat prioritization in a fragmented agroecosystem

Markfeld, Matan

Titre : A network approach for analyzing arthropod diversity and habitat prioritization in a fragmented agroecosystem

גישה רשתית לניתוח מגוון מינים ותעדוף בתי-גידול של פרוקי רגליים במערכת אגרו-אקולוגית מקוטעת.

Auteur : Markfeld, Matan

Etablissement de soutenance : Ben-Gurion University of the Negev

Grade : Master of Science (MS) 2021

Résumé
The current intensification and expansion of modern agriculture makes it a major driver of worldwide biodiversity loss. A main approach to mitigate these negative effects is preserving natural habitat patches within the agricultural matrix in an agroecosystem. The local communities within natural patches are connected into a metacommunity by dispersal of individuals between patches, thus affected by multi-scale determinants and processes. Graph theory enables to represent metacommunity structures of different groups of species, such as common and rare species, by using ecological meaningful networks, and provides tools to prioritize the habitat patches. Here, I ask what are the local and landscape determinants of common and rare species diversities and whether the relative importance of the patches is similar for common and rare species of different taxa. I sampled arthropod communities within natural patches in a fragmented agroecosystem of the Southern Judea Lowlands, Israel. I classified three taxa – Coleoptera, Araneae, and Hemiptera – into common and rare species and constructed a metacommunity network for each species’ group. For the taxa Coleoptera and Hemiptera I found a strong association between patch connectivity and rare species local diversities, whereas for common species the association was considerably lower, suggesting that landscape determinants are more dominant in shaping rare species assemblages than the common species assemblages. For Araneae the association of both common and rare species was high. This difference might be mediated by the species relation with the agricultural matrix. Moreover, I found that common and rare species of each taxon are affected by different spatial scales and the variation between common and rare groups are larger than the inter-taxa variation. Additionally, by comparing the patches’ relative importance for different species’ groups, I found a very high correlation between the three taxa and between common and rare species in each taxon. However, several patches diverged from this trend, as their importance significantly differed between species’ groups, namely between common and rare Coleoptera and Araneae species. Generally, my study increased our knowledge of the multi-scale determinants shaping ecological communities in agroecosystems. This study stresses that common and rare species are distinctive groups of species that should receive explicit consideration in future research and in conservation management and planning

Présentation et version intégrale (PRIMO)

Page publiée le 8 janvier 2022