CURRENT PROJECTS


I. Monitoring of arboreal arthropod communities across a land-use gradient in Sumatra, Indonesia

Tree canopies comprise the bulk of animal biodiversity in tropical rainforests. Much of this diversity is strongly affected by transformation of rainforests into other forest systems or arable land as many of the arthropods are specialists feeding only on certain plant species or preying on a narrow spectrum of invertebrates. Numerous of these species are assumed to go extinct before they have been recorded by science.
Within the Central Scientific Support Unit 990 (‘EFForTS’-project: Ecological and Socioeconomic functions of tropical lowland rainforest transformation systems in Sumatra, Indonesia), I main aim is to measure aboveground biodiversity patterns across a land-use gradient (old growth secondary forest, jungle rubber, rubber and oil palm plantations) by sampling arboreal arthropod communities. Arthropods are sampled by fogging with a knock-down insecticide, and analyzed by functional groups (or guilds) to reveal potential differences in food-web structure between ecosystems along the land-use gradient.
Although arboreal in the adult stage, many of the arboreal species may temporally reside or seek refuge in soil and it is increasingly realized that above- and belowground communities are more closely linked than previously assumed. Above- and belowground animal communities therefore form interlinked compartments of the food web of terrestrial ecosystems. By jointly analyzing data sets across the various workgroups within the CRC990/EFForTS-project, we therefore hope to gain an in-depth understanding of agricultural impacts on the biological diversity and ecosystem stability of tropical rainforest ecosystems.




PUBLICATIONS


  • (9)Grass I, Kubitza C, Krishna V, Corré M, Musshoff O, Drescher J, Rembold K, Pütz P, Ariyanti E, Barnes A, Brinkmann N, Brose U, Brümmer B, Buchori D, Daniel R, Darras K, Fehrmann L, Hein J, Hennings N, Hidayat P, Hölscher D, Faust H, Jochum M, Knohl A, Kotowska M, Krashevska V, Kreft H, Leuschner C, Lobite N, Panjaitan R, Polle A, Potapov A, Purnama E, Qaim M, Röll A, Scheu S, Schneider D, Tjoa A, Tscharntke T, Veldkamp E, and Wollni M (2020). Trade-offs between multifunctionality and profit in tropical smallholder landscapes. #NCOMMS-19-10145B (Accepted)
  • (8)Darras K, Corre MD, Formaglio G, Tjoa A, Potapov A, Brambach F, Sibhatu KT, Grass I, Tscharntke T, Rubiano AA, Buchori D, Drescher J, Fardiansah R, Hölscher D, Irawan B, Kneib T, Krashevska V, Krause K, Kreft H, Li K, Maraun M, Polle A, Ryadin AR, Rembold K, Scheu S, Tarigan S, Valdés-Uribe A, Yadi S, Veldkamp E (2019). Reducing fertilizer and avoiding herbicides in oil palm plantations – Ecological and Economic valuations. Frontiers in Forests and Global Change. Manuscript ID: 461543
  • (7)Panjaitan R, Hidayat P, Buchori D, Peggie D, Harahap IS, Drescher J, Scheu S (2019). Diversity of butterflies (Lepidoptera) caught by using fruit traps in Bukit duabelas and Harapan Forest landscape. AIP Conference Proceedings 2120, 070015
  • (6) Drescher J & Rembold K, Allen K, Beckschäfer P, Buchoiori D, Clough Y, Faust H, Fauzi AM, Gunawan D, Hertel D, Irawan B, Jaya INS, Klarber B, Kleinn C, Knohl C, Kotowska MM, Krashevska V, Krishna V, Leuschner C, Lorenz W, Meijide A, Melati D, Nomura M, Rérez-Cruzado C, Qaim M, Siregar IZ, Steinebach S, Tjoa A, Tscharntke T, Wick B, Wiegand K, Kreft H, Scheu S (2016). Ecological and socio-economic functions across tropical land use systems after rainforert conversion. Philosophical Transactions of the Royal Society B 371: 20150275
  • (5) Drescher, J; Feldhaar, H; Blüthgen, N: Interspecific aggression and resource monopolization of the invasive ant Anoplolepis gracilipes in Malaysian Borneo, Biotropica, 43(1), 93-99 (2011)
  • (4) Drescher, J; Blüthgen, N; Schmitt, T; Bühler, J; Feldhaar, H: Societies drifting apart? Behavioural, genetic and chemical differentiation between supercolonies in the yellow crazy ant Anoplolepis gracilipes, PLoS ONE, 5(10), e13581 (2010), doi:10.1371/journal.pone.0013581
  • (3) Stys, P; Banar, P; Drescher, J: A new Oncylocotis (Hemiptera: Heteroptera: Enicocephalidae) from Sabah: A predacious species associated with the Yellow Crazy Ant, Anoplolepis gracilipes (Hymenoptera: Formicidae), Zootaxa, 2651, 27-42 (2010)
  • (2) Drescher, J; Blüthgen, N; Feldhaar, H: Population structure and intraspecific aggression in the invasive ant species Anoplolepis gracilipes in Malaysian Borneo, Molecular Ecology, 16, 1453-1465 (2007)
  • (1) Feldhaar, H; Drescher, J; Blüthgen, N: Characterization of microsatellite markers for the invasive ant species Anoplolepis gracilipes, Molecular Ecology Notes, 6, 912-914 (2006)