Home About Browse Search
Svenska


The influence of food abundance patterns and predation on breeding ducks with a special emphasis on the interactions between ducklings and fish

Dessborn, Lisa (2011). The influence of food abundance patterns and predation on breeding ducks with a special emphasis on the interactions between ducklings and fish. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2011:9
ISBN 978-91-576-7578-1
[Doctoral thesis]

[img]
Preview
PDF
1MB

Abstract

Ducks breeding in Fennoscandia represent a large part of the total population in Europe, and variations in reproductive success can affect continental population trajectories. It is therefore essential to understand processes affecting breeding success. In this thesis I have looked at temporal and spatial food abundance patterns and how these influence breeding ducks. Egg laying and hatching are often assumed to coincide with peaks in available food. No such peak in food abundance was evident in a boreal catchment based on six years of data. Even without clear food abundance peaks, changes in spring arrival can still lead to suboptimal breeding. I have investigated the importance of spring arrival and its effect on spring phenology and breeding success in two dabbling ducks (teal and mallard). Both species can change breeding time in response to variations in spring arrival; however, early springs have a negative effect on teal. Total food abundance is also important, and fish are known to reduce invertebrates, thus potentially affecting survival of ducklings. In a descriptive study I was able to illustrate that fish reduce the availability of invertebrate prey. Fish also reduce the number of breeding ducks, which is probably a result of competition although pike predation on ducklings can also be of importance. To investigate the effects of pike predation, I introduced adult pike to two lakes that were previously fishless. The number of pairs that settled was not affected by pike, but the subsequent breeding success was reduced significantly. The negative impact of pike on breeding ducks is likely to favour adaptations of anti-predator behaviour. In experimental trials, naïve ducklings recognised and responded to calls from predatory birds. They did not, however, avoid pike, although they displayed a very strong response to simulated pike attacks. They ran on the water, scattered and reassemble far from the initial attack. The lack of identification appears to be compensated by the ability to respond instantly to threat and thus reduce losses.

Authors/Creators:Dessborn, Lisa
Title:The influence of food abundance patterns and predation on breeding ducks with a special emphasis on the interactions between ducklings and fish
Year of publishing :2011
Volume:2011:9
Number of Pages:49
Papers/manuscripts:
NumberReferences
ALLDessborn L., Brochet A-L., Elmberg J., Legagneux P., Gauthier-Clerc M. and Guillemain M. Geographical and temporal patterns in the diet of pintail Anas acuta, wigeon Anas penelope, mallard Anas platyrhynchos and teal Anas crecca in the Western Palearctic (submitted manuscript). Brochet A-L, Dessborn L., Elmberg J., Legagneux P., Gauthier-Clerc M., Fritz H. and Guillemain, M. Diet overlap in mallard, teal and pintail: seasonal patterns at the Western Palearctic flyway scale (manuscript). Dessborn L., Elmberg J., Nummi P., Pöysä, H. and Sjöberg, K. (2009). Hatching in dabbling ducks and emergence in chironomids: a case of predator–prey synchrony? Hydrobiologia 636, 319–329. Arzel C., Dessborn L., Nummi P., Pöysä H., Elmberg J. and Sjöberg K. Early springs and breeding performance in two bird species with similar habitat requirement: Is adaptability to climate change related to migration distance? (manuscript) Elmberg, J., Dessborn, L. and Englund, G. (2010). Presence of fish affects lake use and breeding success in ducks. Hydrobiologia 641, 215-223. Dessborn, L., Elmberg, J. and Englund, G. Pike predation affects breeding success and habitat selection of ducks. Freshwater Biology (in press) Dessborn, L., Englund, G. and Elmberg, J. Responses of mallard ducklings towards aerial, aquatic and terrestrial predators. (manuscript)
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7578-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:ducks, feeding habits, feeding preferences, animal breeding, fishes, animal competition, predation, esox lucius, pike
Keywords:dabbling ducks, diving ducks, diet, breeding success, mis-match, emergence peak, fish competition, pike predation, predator avoidance
URN:NBN:urn:nbn:se:slu:epsilon-3153
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3153
ID Code:2440
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: Lisa Dessborn
Deposited On:21 Feb 2011 00:00
Metadata Last Modified:02 Dec 2014 10:18

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits