title: Management of a Dutch resident barnacle goose Branta leucopsis population: How can results from counts, ringing and hunting bag statistics be reconciled?
abstract: The resident Dutch Northern Delta barnacle geese Branta leucopsis population expanded steadily since birds first bred in 1982, increasing agricultural conflict. Derogation shooting has been used since 2005 to scare geese from sensitive crops and to reduce population size. Numbers almost doubled to ca. 28 000 individuals during 2007-2014, despite annual removal of 15-25% of geese and adult and juvenile survival rates of 79 and 67% (cf. natural survival of 96% for both age classes). Simple population modelling, using estimated annual survival values and fixed fecundity, predicted a moderate increase to 21 500 individuals in 2014. It is unclear whether current harvest levels are sufficient to halt population growth. Shooting may be less effective because of the disproportionate take of immature post-breeding and of individuals from other populations in winter. Discrepancies between counted and modelled abundance call for caution and improved effect monitoring of derogation shooting before harvest levels are increased further.
authors.affiliation: Vogeltrekstation-Dutch Centre for Avian Migration and Demography, NIOO-KNAW, PO Box 50, 6700 AB, Wageningen, The Netherlands. h.vanderjeugd@nioo.knaw.nl.
authors.forename: Henk P
authors.initials: HP
authors.lastname: van der Jeugd
authors.affiliation: Department of Animal Ecology and Ecophysiology, Institute for Water and Wetland Research, Radboud University, PO Box 9010, 6500 GL, Nijmegen, The Netherlands.
authors.forename: Anne
authors.initials: A
authors.lastname: Kwak
mesh_terms: D063147:Animal Distribution; D025041:Animal Migration; D000818:Animals; D003247:Conservation of Natural Resources / Q000379:methods* / Q000706:statistics & numerical data; D005777:Geese / Q000502:physiology*; D008954:Models, Biological; D009426:Netherlands; D011156:Population Density
keywords: Derogation shooting; Geese; Hunting bag; Management; Population model; Survival