NDLI: Managing hunted populations through sex-specific season lengths: a case of the Common Eider in the Baltic-Wadden Sea flyway population

Content Provider	Springer Nature Link
Author	Christensen, Thomas Kjær Hounisen, Jens Peder
Copyright Year	2014
Abstract	Management of harvested wildlife populations aims to protect species from overexploitation and ultimately extinction, by regulating exploitation towards achievable sustainable levels. However, assessments of impact and sustainability of implemented management actions on a population level are scarce. This study assesses effects of changes in hunting season length imposed on the Baltic-Wadden Sea Common Eider Somateria mollissima population, including differential restriction on hunting of the sexes. The potential impact of these changes on the population was assessed by simple demographic matrix projections. Since the early 1990s, this population has declined at ca. 6.3 % per annum, and the male/female ratio among shot birds has fallen from 3:2 to about 3:1. Concerns in Denmark regarding the conservation status and sustainability of contemporary levels of exploitation resulted in shortening the open season by 44 and 46 days for females and 13 and 15 days for males from the hunting seasons 2004/2005 and 2011/2012 onwards, respectively. These reduced the kill of adult females by 82 %, adult males by 31 %, juvenile females by 58 % and juvenile males by 55 %. The observed reduction in the kill of adult females following both changes in 2004/2005 and 2011/2012 matched the expected changes based on the seasonal distribution of sexes in the bag prior to the change. Post 2004/2005 hunters killed more adult males, but shot markedly fewer juvenile birds than expected. Demographic modelling of the female population showed that the effects of the reduced hunting would correspond to an increase in the annual population growth rate from the previous −6.3 to −3.6 % (post 2004) and −1.6 % (post 2011). The model also predicted that a full ban on hunting female eiders (adults and juveniles) would lead to a positive population growth rate of 0.7 %. Taking into account the conservative model estimates and natural variations in annual breeding success, the implemented changes in sex-specific regulation of hunting may potentially be an effective management tool to halt the decline of the Baltic-Wadden Sea eider population, potentially rendering such levels of hunting sustainable under prevailing conditions.
Starting Page	717
Ending Page	726
Page Count	10
File Format	PDF
ISSN	16124642
Journal	European Journal of Wildlife Research
Volume Number	60
Issue Number	5
e-ISSN	14390574
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-07-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hunting Sex differentiation Bag size Common Eider Somateria mollissima Wildlife management Population development Zoology Animal Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics Management, Monitoring, Policy and Law Nature and Landscape Conservation

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Declines amongst breeding Eider Somateria mollissima numbers in the Baltic/Wadden Sea flyway (2011)

Managing hunted populations through sex-specific season lengths: a case of the Common Eider in the Baltic-Wadden Sea flyway population

Baltic/wadden sea common eider 167 status of the baltic/wadden sea population of the common eider somateria m. Mollissima (2005).

Baltic/wadden sea common eider 167 status of the baltic/wadden sea population of the common eider somateria m. Mollissima.

Status of the Baltic/Wadden Sea population of the Common Eider Somateria m. mollissima

Data from: Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima (Dataset)

Age of first breeding in the Common Eider Somateria m. mollissima population in the northern Baltic Sea (2009)

in the Common Eider (Somateria mollissima)? (2012)

1do common eiders somateria mollissima exhaust their food resources? a study on natural mussel mytilus edulis beds in the wadden sea do common eiders somateria mollissima exhaust their food resources? a study on natural mussel mytilus edulis beds in the.

Managing hunted populations through sex-specific season lengths: a case of the Common Eider in the Baltic-Wadden Sea flyway population

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Managing hunted populations through sex-specific season lengths: a case of the Common Eider in the Baltic-Wadden Sea flyway population

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