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Early springs and breeding performance in two sympatric duck species with different migration strategies
University of Turku.
Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Research environment Man and Biosphere Health (MABH).ORCID iD: 0000-0003-2868-2210
Joensuu Game and Fisheries Research.
Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Research environment Man and Biosphere Health (MABH).
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2014 (English)In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 156, no 2, 288-298 p.Article in journal (Refereed) Published
Abstract [en]

The capacity of migratory species to adapt to climate change may depend on their migratory and reproductive strategies. For example, reproductive output is likely to be influenced by how well migration and nesting are timed to temporal patterns of food abundance, or by temperature variations during the brood rearing phase. Based on two decades (1988–2009) of waterfowl counts from a boreal catchment in southern Finland we assessed how variation in ice break-up date affected nesting phenology and breeding success in two sympatric duck species, Mallard Anas platyrhynchos and Eurasian Teal Anas crecca. In Fennoscandia these species have similar breeding habitat requirements but differ in migration distance; Teal migrate roughly seven times as far as do Mallard. Annual ice break-up date was used as a proxy of spring ‘earliness’ to test the potential effect of climate change on hatching timing and breeding performance. Both species were capable of adapting their nesting phenology, and bred earlier in years when spring was early. However, the interval from ice break-up to hatching tended to be longer in early springs in both species, so that broods hatched relatively later than in late springs. Ice break-up date did not appear to influence annual number of broods per pair or annual mean brood size in either species. Our study therefore does not suggest that breeding performance in Teal and Mallard is negatively affected by advancement of ice break-up at the population level. However, both species showed a within-season decline in brood size with increasing interval between ice break-up and hatching. Our study therefore highlights a disparity between individuals in their capacity to adjust to ice break-up date, late breeders having a lower breeding success than early breeders. We speculate that breeding success of both species may therefore decline should a consistent trend towards earlier springs occur.

Place, publisher, year, edition, pages
2014. Vol. 156, no 2, 288-298 p.
Keyword [en]
breeding success, breeding timing, brood size, climate change, ice break-up, Mallard, migration distance, sympatric breeders, Teal
National Category
Ecology
Identifiers
URN: urn:nbn:se:hkr:diva-11906DOI: 10.1111/ibi.12134ISI: 000332792800003OAI: oai:DiVA.org:hkr-11906DiVA: diva2:709297
Available from: 2014-04-01 Created: 2014-04-01 Last updated: 2016-04-01Bibliographically approved

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Citation style
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