hkr.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The status of the Nordic populations of the Mallard (Anas platyrhynchos) in a changing world
Department of Bioscience, Aarhus University.
Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Forskningsmiljön Man and Biosphere Health (MABH).ORCID iD: 0000-0003-1212-6607
Department of Bioscience, Aarhus University.
Department of Bioscience, Aarhus University.
Show others and affiliations
2013 (English)In: Ornis Fennica, ISSN 0030-5685, Vol. 90, no 1, 2-15 p.Article in journal (Refereed) Published
Abstract [en]

Dabbling ducks (Anas spp.) are importantmigratory quarry species, protected as a shared resource under international legislation. However, there is a lack of sufficient high-quality data on vital demographic rates and long-term trends in numbers to judge the conservation status of many duck populations at the flyway level. In response to reported declines in the North-West European flyway population of theMallard, we compiled available data on this species in the Nordic countries up to 2010. Generally, national breeding numbers showed increasing trends, wintering abundance showed variable trends, and productivitymeasures indicated stable or increasing trends.Major knowledge gaps were identified, namely the size of hunting bags, the influence of the released Mallards and the role of short-stopping in explaining changing patterns of wintering abundance across the North-West European flyway. Numerically the Nordic breeding population appears in “good condition”, and the wintering numbers have been either stable or increasing in the last two decades. The annual number of releases needs to be determined in order to judge the sustainability of the current levels of exploitation. Overall, none of the indicators showed alarming signs for the Mallard population in the Nordic countries when considered in isolation. However, the widespread decline in wintering numbers elsewhere across North-western Europe requires urgent pan-European action.

Place, publisher, year, edition, pages
2013. Vol. 90, no 1, 2-15 p.
National Category
Zoology
Identifiers
URN: urn:nbn:se:hkr:diva-10140ISI: 000317947800002OAI: oai:DiVA.org:hkr-10140DiVA: diva2:603144
Available from: 2013-02-05 Created: 2013-02-05 Last updated: 2017-05-03Bibliographically approved
In thesis
1. Large-scale releases of native species: the mallard as a predictive model system
Open this publication in new window or tab >>Large-scale releases of native species: the mallard as a predictive model system
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Human alteration of natural systems, and its consequences are of great concern and the impact on global ecosystems is one of the biggest threats that biodiversity stands before. Translocations of invasive species, as well as intraspecific contingents with non-native genotypes, whether they are deliberate or unintentional, are one such alteration and its consequences are continuously being assessed. The mallard (Anas platyrhynchos) is the most numerous and widespread duck in the world and a flagship in wetland conservation. It is also an important game species which is heavily restocked for hunting purposes, especially in Europe where over three million ducklings are released every year. Because of its hunted status, its abundance, and the number of released individuals, it can serve as a model species to study effects of releases, both for conservation and restocking for hunting, on wild populations. In this thesis the status of the mallard was assessed in the Nordic countries and the effects of releases on the wild populations were studied by mining historical ringing data, comparing morphology of present-day wild, farmed, and historical mallards, and analyzing phylogeography of wild and farmed mallards in Europe. The status of the mallard population in the Nordic countries are generally good, however, a joint effort of European countries is needed to monitor and manage the population. A significant difference between wild and farmed mallards concerning longevity, migration, bill morphology and genetic structure was also found, together with signs of cryptic introgression of farmed genotypes in the wild population with potential fitness reduction as a result. The effect is however limited by that only a fraction of released farmed mallards reach the breeding season due to low survival. A natural captive environment is crucial to keep individuals wild-like with high survival rates after release. However, with an introgression of potentially maladapted farmed genotypes leading to a reduction in fitness, a low survival of released mallards would favor the wild population. A legislative change regarding obligation to report numbers, provenance, and release sites of farmed mallard should be considered, together with practical solutions of ringing and genetic monitoring of released mallards.

Place, publisher, year, edition, pages
Umeå: Sveriges Lantbruksuniversitet, 2015
Series
Acta Universitatis agriculturae Sueciae, ISSN 1652-6880 ; 2015:25
National Category
Zoology Fish and Wildlife Management
Identifiers
urn:nbn:se:hkr:diva-13751 (URN)978-91-576-8248-2 (ISBN)978-91-576-8249-9 (ISBN)
Available from: 2015-03-30 Created: 2015-03-30 Last updated: 2017-05-03Bibliographically approved

Open Access in DiVA

fulltext(183 kB)136 downloads
File information
File name FULLTEXT02.pdfFile size 183 kBChecksum SHA-512
138f445d84393c8a6d7370391b56f1a0be920c6b3a6319f30cd0d0d5f09f6a65675e937a6900b7faa34f85f4b674e3ef154b226d3947d3ac0cee5cd0d9b2dceb
Type fulltextMimetype application/pdf

Other links

Fulltext

Search in DiVA

By author/editor
Söderquist, PärElmberg, Johan
By organisation
Avdelningen för NaturvetenskapForskningsmiljön Man and Biosphere Health (MABH)
In the same journal
Ornis Fennica
Zoology

Search outside of DiVA

GoogleGoogle Scholar
Total: 143 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 166 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf