Abstract booklet - gtö – Society for Tropical Ecology

194 SCIENTIFIC POSTER SESSION | FOYERSCIENTIFIC POSTER SESSION | FOYER195Free contributionTopic: Hotspot WallaceaWEDNESDAY | FOYERLIVING DOWN THE TUBE: ROOSTING CONDITIONS ANDBEHAVIORAL ADAPTATIONS OF THE SPIX’S DISK-WINGED BATTHYROPTERA TRICOLORInga Geipel 1 , Melanie Mangold 1 , Elisabeth K. V. Kalko 1,21Institute of Experimental Ecology, University of Ulm, Albert Einstein Allee 11,89069 Ulm, Germany, inga.geipel@uni-ulm.de; melanie_mangold_33@yahoo.de;2Smithsonian Tropical Research Institute, Balboa, Panamá, elisabeth.kalko@uniulm.deAvailability of suitable shelters is one of the most important factors for thesurvival of animals, as they protect the animals from predators, contributeto thermoregulation and serve as nurseries. Bats, in particular in the tropics,use a wide range of different roosts. One of the highest specializations toroosting sites is found in the Disk-Winged bat Thyroptera tricolor. This speciesuses unfurled leaves of certain plants, e.g., Heliconia sp. and Calathea sp. asshelters. The freshly produced leaves form tubes which unfurl during the leafdevelopment and loose their protecting properties for the roosting bats. Sincethe plants grow scattered in the dense understory of tropical rainforests andirregularly produce new leaves, the bats are continuously forced to searchand find new, adequate roosts. Here, we present data to demonstrate thatsuitable roosts can constitute a limiting factor for T. tricolor in the forest onBarro Colorado Island, Panamá. Continuous monitoring of leaf developmentshows that roosting duration in a natural, unfurled leaf is determined by theunfurling process happening within 24 h. In an experiment with artifical tubeswe revealed that the roosting duration of the bats is significantly increased ifthe leaf tubes stay unfurled. T. tricolor shows two activity peaks during the nightin which the bats use high frequency, broadband echolocation calls to evaluatepreviously found leaf tubes as possible roosts.Merian Award Winner 2011PHYLOGEOGRAPHY OF TWO TROPICAL PIONEER TREE SPECIES,MACARANGA GIGANTEA AND M. PEARSONII (EUPHORBIACEAE)Daniela Guicking 1 , Brigitte Fiala 2 , Kurt Weising 11Systematik und Morphologie der Pflanzen, Univ. Kassel, Heinrich-Plett-Str. 40,34132 Kassel, Germany, 2Zoologie 3, Biozentrum, Universität Würzburg, AmHubland, 97074 Würzburg, Germany.Phylogeography of two tropical pioneer tree species, Macaranga gigantea andM. pearsonii (Euphorbiaceae). Macaranga (Euphorbiaceae) has received muchecological and evolutionary research attention as a genus that includes some ofthe most conspicuous pioneer trees of Southeast Asian tropical rainforests andbecause of its manifold associations with ants, including about 30 species thatare obligate ant-plants (myrmecophytes). We used sequence data from threechloroplast DNA loci (ccmp5, ccmp6, atpB-rbcL) to assess phylogeographicalpatterns in species of section Pruinosae, sampled from various regions of Borneoand the Malay Peninsula. Forty-one haplotypes were species-specific, whereaseight haplotypes were shared by two, three or four species and occupiedinternal positions in a parsimony network. The non-myrmecophytic M. giganteaand the ant-associated M. pearsonii have overlapping distributions in northernand eastern Borneo. A comparison of GST and NST values revealed a strongphylogeographic structure in both species, whereas colonization pathwayssuggested by the network topology were different. In the widespread speciesM. gigantea identical or closely related haplotypes occurred in East Kalimantanand on the Malay Peninsula. This pattern most likely originated from migrationacross land connections between Borneo and the mainland during cold periodswith low sea levels during the Plio- and/or Pleistocene. The central mountainrange in Borneo forms an intraspecific barrier both in M. gigantea and M.pearsonii, with eastern and western haplotypes clearly differentiated from eachother, suggesting long-term independent evolution. Myrmecophytes need asuitable partner ant to establish a new population at a remote site, whereasin non-myrmecophytes the successful recruitment is mainly restricted by seeddispersal efficiency. We found, however, no obvious indications for a stronginfluence of the symbiotic ant partners on the population structure of their hostplants.Wednesday WEDNESDAY 16:00 | FOYER | FoyergtöSociety for Tropical Ecology | Gesellschaft für Tropenökologie e.V. Status and future of tropical biodiversity | Frankfurt, 21 - 24 February 2011gtö