Selected publications

The Environmental Impact Classification for Alien Taxa (EICAT) has been adopted as an International Union for Conservation of Nature (IUCN) standard to measure the severity of environmental impacts caused by organisms living outside their native ranges. This article clarifies the underlying principles, objectives, and uses of EICAT.

The authors included effects of intraspecific variation to a variance partitioning method that allows quantifying effects of losses and gains of inter- and intraspecific groups to changes in ecosystem functioning. The method will also provide information on how biodiversity loss at different ecological levels changes ecosystem functioning.

The authors explored the occurrence of slow eco-evolution which allows conceptualizing biological systems along a continuum of various eco-evolutionary rates and suggests that eco-evolutionary systems are dynamic concerning ecological and evolutionary speeds. They highlight how environmental change can alter the speed of eco-evolution via affecting modulators of ecological and evolutionary rates.

This study extends the concept of flagship species to include individual organisms, who can garner public attention and attract conservation support. Flagship individuals typically share a similar suite of characteristics, including: (1) charismatic species-level traits; (2) unique or distinctive individual traits; (3) a high degree of exposure to humans; and (4) a noteworthy life history or fate.

The authors used unusual Citizen Science data from several decades to show that the American mink has decimated the native eider duck in the Brokey archipelago by about 60 %. In another Icelandic landscape, the return of the native Arctic fox had no discernible impact on the eider population - presumably due to the common evolutionary history in which the eiders have developed defence strategies.

The authors have identified the most important risk species among aquatic pets for Germany and developed a three-step risk assessment method that can serve as a screening tool and as a basis for legislation to restrict future releases of unwanted animals. This is essential, as the study also shows that 97 per cent of the freshwater species sold in Germany are not native.

Until now, the toxicity assessment of microplastics in the environment relied on the model organism Daphnia magna for evaluating potential hazards to aquatic invertebrates. However, other Daphnia species are primarily found in Northern Hemisphere lakes, most notably Daphnia longispina. The current study reveals that Daphnia longispina can be more sensitive to microplastics than Daphnia magna. 

Looking at insular amphibians, reptiles and birds across the world, the authors investigated mismatches between native and non-native climatic niches and how these mismatches can be explained. The results show that climatic mismatches are common for non-native birds and reptiles, but rare for amphibians, and that several factors are significantly related to these mismatches.