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Learning from long time series of harvest and population data: Swedish lessons for European goose management
SLU.
Svenska jägareförbundet.
Kristianstad University, Faculty of Natural Sciences, Avdelningen för miljö- och biovetenskap. Kristianstad University, Faculty of Natural Sciences, Research environment Man & Biosphere Health (MABH).ORCID iD: 0000-0003-2337-4155
Lunds universitet.
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2021 (English)In: Wildlife Biology, ISSN 0909-6396, E-ISSN 1903-220X, Vol. 1, p. 1-10, article id wlb.00733Article, book review (Refereed) Accepted
Abstract [en]

Goose management in Europe is faced by multiple challenges, as some species are declining and in need of conservation actions, while other populations have become very abundant, resulting in calls for increased harvest. Sweden has long-term series of harvest data and counts of breeding and autumn-staging geese. We used national data (indices) for greylag goose, bean goose and Canada goose to study shifts in temporal trends and correlative patterns, and to infer possible causal links between harvest and population trends. Our study provides an opportunity to guide management given the data collected within the present monitoring, as well as to suggest improvements for future data collection. The populations of greylag and Canada geese increased in Sweden 1979–2018, but this long-term trend included a recent decrease in the latter species. Bean goose breeding index decreased, whilst staging numbers and harvest varied with no clear long-term trend. For Canada goose, our analysis suggests that harvest may affect population growth negatively. For bean goose and greylag goose we could not detect any effect of harvest on autumn counts the following year. We find that the present data and analysis of coherence may suffice as basis for decisions for the current management situation in Sweden with its rather unspecific goals for greylag (very abundant) and Canada goose (invasive species) populations. However, for management of bean geese, with international concerns of over harvest, data lack crucial information. For future management challenges, with more explicit goals, for all goose species we advocate information that is more precise. Data such as hunting effort, age-structure of goose populations and mark–recapture data to estimate survival and population size, is needed to feed predictive population models guiding future Swedish and European goose management.

Place, publisher, year, edition, pages
2021. Vol. 1, p. 1-10, article id wlb.00733
Keywords [en]
conservation, goose populations, harvest, management, monitoring programs, population trajectories, time series
National Category
Ecology
Identifiers
URN: urn:nbn:se:hkr:diva-21788DOI: 10.2981/wlb.00733ISI: 000672752300003OAI: oai:DiVA.org:hkr-21788DiVA, id: diva2:1542128
Funder
Swedish Environmental Protection Agency, NV-00695-17
Note

This study was supported by the Swedish Environmental Protection Agency by grants for research project (Naturvårdsverket, NV-00695-17) and The Swedish bird survey (fixed routes). The Swedish Association for Hunting and Wildlife Management provided research funding and grants for the autumn count program of geese.

Available from: 2021-04-06 Created: 2021-04-06 Last updated: 2021-07-30Bibliographically approved

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Elmberg, Johan

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