Implementing the Berlin Bee Strategy for conservation of bees and other pollinators in Berlin by optimising the protection of wild bees (funded bei Senatsverwaltung für Umwelt, Verkehr und Klimaschutz Berlin) – more info coming soon.
Working at the Charles Darwin Research Station again
Thanks to a research fellowship sponsored by the Schimper Stiftung I was able to go to the Galápagos in February. It was great to continue my work on the Scalesia restoration project in the highlands of Santa Cruz. After intensive work in the invertebrate lab we finished all spider and beetles identifications and counted all other invertebrates caught within the long-term monitoring. This program started in 2014 and invertebrates were caught in 34 plots using pitfall and Malaise traps. First results have been recently published but more detailed analyses will be available soon.
Restauración del bosque de Scalesia invadido por mora: Impactos en la vegetación, los invertebrados y las aves has been published in Informe Galápagos.
Authors Jäger H, S Buchholz, A Cimadom, S Tebbich, J Rodríguez, D Barrera, A Wolentowitz, M Breuer, A Carrión, C Sevilla & C Causton
Grasshopper diversity of urban wastelands is primarily boosted by habitat factors has been published in Insect Diversity and Conservation.
Authors Eckert S, Möller M & Buchholz S
Abstract Urban wastelands are considered to be valuable habitats for biodiversity conservation, but empirical evidence for several poorly investigated taxa such as grasshoppers is still pending – although urgently required for reasonable habitat management and urban planning. For the first time, we analysed grasshopper diversity of urban wastelands at different diversity levels, namely, alpha and functional diversity. In 2014, we selected 24 urban wastelands in the city of Berlin (Germany).
We analysed the relationships between local and landscape factors and different measurements of diversity (species richness, Simpson diversity, functional dispersion, functional evenness and functional divergence). We sampled 21 species, which represented about 45% of the entire grasshopper fauna of Berlin and numerous species of conservation interest were present at the investigated sites. Grasshopper diversity was best explained by local factors, with herb cover having a positive effect on alpha and functional diversity. Human impact and accessibility increased the conservation value of urban wasteland sites.
Late successional stages are very important for a high grasshopper diversity in general but early stages are mandatory to promote species of conservation concern. Urban wastelands can be turned into most promising transition zones for city-dwellers that fulfil the needs of conservationists and specialised species at the same time. To achieve this goal we recommend minimum requirements for successful habitat management.
Conference talk in Braunschweig
The German Society of general and applied Entomology (DGaaE) and the German Scientific Society for Plant Protection and Plant Health (DPG) organised a conference on insect diversity in cities (III. Urbane Pflanzen Conferenz). I contributed a talk on habitat function of urban meadows for wild bees with emphasis on urbanisation effects (see Abstract in German). Due to a very diverse audience with many relevant stakeholders and decision-makers (e.g. scientists, gardeners, landscape planners, landscape architects, authorities and NGOs) it was possible to elaborate this topic from different perspectives. At the end we had very interesting – sometimes controverse – discussions to develop recommendations how to make cities more insect friendly and to comment on the new white book „Grün in der Stadt“ which was recently send out for preview. The official presentation of the white book will be in May 2017.
Disentangling urban habitat and matrix effects on wild bee species has been published in PeerJ.
Authors Fischer LK, Eichfeld J, Kowarik I & Buchholz S
Abstract In face of a dramatic decline of wild bee species in many rural landscapes, potential conservation functions of urban areas gain importance. Yet effects of urbanization on pollinators, and in particular on wild bees, remain ambiguous and not comprehensively understood. This is especially true for amenity grassland and extensively managed wastelands within large-scale residential housing areas. Using Berlin as study region, we aimed to investigate (a) if these greenspaces are accepted by wild bee assemblages as foraging habitats; (b) how assemblage structure of bees and individual bee species are affected by different habitat (e.g., management, flower density) and urban matrix variables (e.g., isolation, urbanization); and (c) to what extend grassland restoration can promote bees in urban environments. In summer 2012, we collected 62 bee species belonging to more than 20 % of the taxa known for Berlin. Urbanization significantly affected species composition of bees; 18 species were affiliated to different levels of urbanization. Most bee species were not affected by any of the environmental variables tested, and urbanization had a negative effect only for one bee species. Further, we determined that restoration of diverse grasslands positively affected bee species richnesss in urban environments. We conclude that differently structured and managed greenspaces in large-scale housing areas can provide additional foraging habitats and refuges for pollinators. This supports approaches towards a biodiversity friendly management within urban regions and may be of particular importance given that anthropogenic pressure is increasing in many rural landscapes.
I am looking forward to spend a glorious time in Galápagos. I am going to participate in a research project for three months …
Over the last 10 years, the Galápagos National Park Directorate has carried out manual and chemical control of the invasive blackberry in the Scalesia forests at Los Gemelos on Santa Cruz. It is possible that this management has changed the structure of the forests which is supposed to affect invertebrates and birds that live there. To analyse effects of the management on plants, invertebrates and birds, a multi-taxon monitoring has been established. My part in this project is to evaluate the efficacy of the blackberry control measures and the impacts on non-target invertebrate species.
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Montane heathland rejuvenation by choppering – effects on vascular plant and arthropod assemblages has been published in Journal for Nature Conservation.
Natural peat bog remnants promote distinct spider assemblages and habitat specific traits has been published in Ecological Indicators.