TY - THES A1 - Tscherner, Marie T1 - Anthropogenic Impact on the Amphibian Population at the Ober-Lohberg-Allee in Dinslaken N2 - The current rapid biodiversity loss results in a sped-up extinction of species worldwide. Human health and welfare depend on ecosystem functions and services which are interchangeably connected to biodiversity. Amphibians are one of the most sensitive and vulnerable species to anthropogenic impacts, because of their fast reactions to changing conditions in their surroundings they are often referred to as bioindicator species. Since year 2016 an amphibian population located in the district of Wesel in North-Rhine-Westphalia in Germany experiences drastic changes in population size and composition. To find out if anthropogenic impacts may influence the development of the amphibian population, different methods for assessing the population and biodiversity are used. Data was collected from year 2017 to 2023 with the help of a drift fence with pitfall traps. The amphibian population is evaluated regarding population size, age structure, sex ratio and migration behaviour. Additionally, biodiversity indices are used for a quantitative and qualitative analysis. As last step, the amphibian population is compared to another amphibian population with similar preconditions, but experiencing less anthropogenic pressure. A high reduction of population size and changes in age and sex composition were found for the assessed amphibian population. Moreover, the migration behaviour alternates over time. The found results strongly indicate that the main cause of the negative development is a high anthropogenic pressure. Further intensive conservation and monitoring actions are needed, to restore the amphibian population and avoid the complete destruction. Y1 - 2023 ER -