Abstract booklet - gtö – Society for Tropical Ecology

114 PARALLEL SESSION HALL H III | BIODIVERSITY SCIENCE & POLICYPARALLEL SESSION HALL H IV | TROPICAL VERTEBRATES115BUSHMEAT HARVEST AT THE NEXUS OF SOCIO-ECONOMICS ANDHABITATPARALLEL SESSION HALL H IV | 15:15 | WEDNESDAY:TROPICAL VERTEBRATESChair: Eckhard HeymannStefan Ziegler 1 , Stefanie Jacob 2 , Roland Melisch 3 , Martin Wegmann 21WWF Germany, Frankfurt, DE, stefan.ziegler@wwf.de, 2 University of Würzburg,DE, 3 TRAFFIC International, Frankfurt, DEMOVEMENT PATTERN, HABITAT USE AND DIET OF TROPICAL RANIDFROGS: A COMPARISON BETWEEN PIONEER AND NATIVE ANURANSIN BORNEOOliver Konopik 1 , Karl Eduard Linsenmair 1 , Ulmar Grafe 2WEDNESDAY 16:00 Hall H IIIUnderstanding environmental change and socioeconomic development haverarely been considered simultaneously when evaluating the impacts on andbenefits from the bushmeat resource. We analyse landscape patterns as wellas socio-economic data sets in the Congo Basin and how these factors relate torecorded bushmeat trade data throughout the last 30 years. Bushmeat relevantdata are derived from food balance sheets provided by the FAOSTAT databaseand a range of published and non-published sources. We define proxy indicatorsfor hunting pressure and discuss their inter-relationships with habitat variables.Despite the overall trend of decreasing forest cover in Central Africa, theanalysis leads to the conclusion that overall bushmeat extraction has increasedin the Congo Basin, but the gradient of bushmeat harvest per forest area hasbeen on the decline in certain countries since the turn of the millennium. Theoutcome of the study also shows a trend of bushmeat consumption increasingwith personal wealth expressed as GDP per head throughout the Congo BasinStates.1University of Würzburg, Würzburg, DE, oliverkonopik@gmx.de, 2 UniversitiBrunei Darussalam, Bandar Seri Begawan, BNIn many parts of the world amphibians are among the most threatenedtaxonomical groups. Declines in Southeast Asia are mainly attributed tohabitat loss caused by logging or land conversion. Here we provide acase study of the extent and possible impact of the immigration of alienpioneer anuran species into a primary rainforest in Brunei Darussalam(Borneo) facilitated by the construction of a road. We compared themovement pattern, habitat use and diet of two immigrant species(Hylarana glandulosa and Limnonectes ingeri) to those of a nativeclose relative (Limnonectes leporinus). Over a period of four month wesurveyed a forest stream, which was traversed by a recently constructeddirt road. Movement pattern was obtained by either individual markedspecimens or by radio telemetry with implantable transmitters. The dietanalysis was done by stomach flushing. We identified and measuredthe recovered prey items and classified them into certain taxonomicalgroups. In addition we took tissue samples to analyze stable nitrogenisotope ratios. This study revealed distinct differences in the habitat useof the native and the immigrant species and could proof that the invasionwas clearly linked to the construction of the dirt road. Furthermore wecould show that Limnonectes ingeri, one of the immigrant species,migrates more than 500 meters into the adjacent primary forest. The dietcomposition of the three species was similar, but there were also someimportant differences. Particularly Limnonectes ingeri preyed heavilyon other anuran species, including the native relatives. This was furtherunderlined by the results of the stable isotope analysis. Hence we suggestthat the local amphibian assemblage is not only threatened by the shiftingchemical and morphological features of the streams within the area ofimpact, but also by the direct influence of the immigrant species. Thesespecies could cause a further decline in native amphibian populationseither via competition or predation. We also discuss if it is suitable toconsider Limnonectes ingeri as an indicator species for human impact,particularly the influence of roads, in the hilly lowland forest of Borneo.WEDNESDAY 15:15 Hall H IVgtöSociety for Tropical Ecology | Gesellschaft für Tropenökologie e.V. Status and future of tropical biodiversity | Frankfurt, 21 - 24 February 2011gtö