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Item Type: Datapackage × search.filters.applied.f.scientificName: Branta leucopsis × Author: Kölzsch, Andrea ×

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    Data from: More grazing, more damage? Assessed yield loss on agricultural grassland relates non-linearly to goose grazing pressure
    (2023-11-29) Buitendijk, Nelleke H.; de Jager, Monique; Kruckenberg, Helmut; Kölzsch, Andrea; Moonen, Sander; Müskens, Gerhard J.D.M.; Nolet, Bart A.
    1. In recent decades, conflict between geese and agriculture has increased. Management practices to limit this conflict include concentrating geese in protected areas, derogation shooting or population reduction. To justify such management, we need to understand their effects on goose-related damages, which requires an understanding of how yield loss is influenced by goose abundance and species interactions. 2. We combined data from monthly goose counts and GPS-tracked geese to estimate grazing pressures by barnacle, white-fronted and greylag geese on agricultural grassland in Fryslân, the Netherlands. Using linear mixed models, we related this to damages assessed by professional inspectors. 3. Our results show a positive nonlinear relationship between yield loss and barnacle goose grazing pressure, where assessed damage increases with a decelerating rate as grazing pressure increases. For white-fronted geese, we find a negative relationship, while for greylag geese both positive and negative relationships occur. For each species, the relationship is influenced by the abundance of the other two. 4. For barnacle geese, the relationship can be explained by selection of fields offering the best balance between food intake and energy expenditure, and by grass regrowth, with highest grazing pressures occurring over a longer time period. The results for the other species are likely due to spatial and temporal differences in foraging preferences compared to barnacle geese, where larger species avoid areas with highest damages. 5. Synthesis and applications. Our results suggest that decreasing herbivore abundance may not translate directly to decreased yield loss, and management tools such as population reduction or derogation shooting should be used with care. Management aimed at concentrating geese in refuges could help to alleviate farmer–goose conflict, although further studies are required to determine if it would lead to damage reduction. We also find that not all species contribute equally to agricultural damage; care should be taken to ensure wildlife management targets the right species.
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    Data package
    Data from: Wild goose chase: geese flee high and far, and with aftereffects from New Year’s fireworks
    (2022-11-28) Kölzsch, Andrea; Lameris, Thomas K.; Müskens, Gerhard J.D.M.; Schreven, Kees H.T.; Buitendijk, Nelleke H.; Kruckenberg, Helmut; Moonen, Sander; Heinicke, Thomas; Cao, Lei; Madsen, Jesper; Wikelski, Martin; Nolet, Bart A.
    In the present Anthropocene, wild animals are globally affected by human activity. Consumer fireworks during New Year (NY) are widely distributed in W-Europe and cause strong disturbances that are known to incur stress responses in animals. We analyzed GPS tracks of 347 wild migratory geese of four species during eight NYs quantifying the effects of fireworks on individuals. We show that, in parallel with particulate matter increases, during the night of NY geese flew on average 5–16 km further and 40–150 m higher, and more often shifted to new roost sites than on previous nights. This was also true during the 2020–2021 fireworks ban, despite fireworks activity being reduced. Likely to compensate for extra flight costs, most geese moved less and increased their feeding activity in the following days. Our findings indicate negative effects of NY fireworks on wild birds beyond the previously demonstrated immediate response.