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001-es BibID:BIBFORM018802
Első szerző:Hedenström, Anders
Cím:Migration speed and scheduling of annual events by migrating birds in relation to climate change / A. Hedenström, Z. Barta, B. Helm, A. I. Houston, J. M. McNamara, N. Jonzén
Dátum:2007
Megjegyzések:Empirical evidence for changed timing of migration in birds is emerging from both American and Euro-African migration systems. These changes are usually interpreted as a consequence of changes in climate. Responses in timing of migration and breeding may differ among species, and the adaptive significance is not well understood. There is a lack of theoretical understanding about time-shifts in life-history events due to climatic changes. In the present paper, we use 2 separate modelling approaches to investigate the effects of climate change on migration. We first use a simple model of flight speed and foraging to explore which factors may influence migration speed and stopover itinerary. Our second approach derives predictions based on an annual routine model, where behavioural strategies regarding timing of migration, breeding, moult and number of breeding attempts are modelled in an environment comprising 4 locations (breeding and wintering sites and 2 stopover sites). This approach takes account of interrelationships between behaviours and seasons as a step towards realistic modelling of migratory connectivity. Departure from the wintering site is advanced in relation to the advancement of spring if the moult is in summer, but not so for species with a winter moult, while arrival at the breeding site is advanced for both moult scenarios. Timing of breeding and number of successful broods were also affected by spring advancement, while start of moult is relatively unaffected by climate change. These optimal solutions under the modelled set of parameters are discussed with respect to current knowledge of the mechanisms underlying seasonal timing in birds.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Annual routines
Climate change
Phenology
Timing of breeding
Bird migration
Megjelenés:Climate Research. - 35 : 1-2 (2007), p. 79-91. -
További szerzők:Helm, B. Houston, A. I. McNamara, John M. Jonzén, N. Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:OTKA
NF 61143
OTKA
T046661
Internet cím:DOI
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2.

001-es BibID:BIBFORM081298
Első szerző:Végvári Zsolt (biológus)
Cím:Multivariate climatic effects and declining avian populations in an alkaline grassland complex / Zsolt Végvári, Zoltán Barta
Dátum:2016
ISSN:0936-577X 1616-1572
Megjegyzések:As shown by recent studies, the population dynamics of many avian species have been affected by global climatic processes. Nevertheless, the number of studies on the effects of multivariate climatic predictors is still rather low. Using a long-term dataset of 19 species breeding in the Hortobágy (Hungary), considered the largest unbroken alkaline steppe in Europe, we estimated the effects of global and local climatic variables on avian population trends. Our results indicate that the population dynamics of several species might be driven by multivariate climatic effects. Specifically, the population trends of long-distance migratory species increasing in the Hortobágy were affected by both the NAO inducing milder climatic conditions in the southern part of Europe and increasing trends in Sahel rainfall. In turn, short-distance migrants reacted to warming winters through population growth. Additionally, negative population trends correlated with climatic parameters in several species of key conservation importance, with unknown causes of decline. In sum, we suggest that a sound understanding of multivariate climatic effects on avian populations is needed to outline more effective management plans that help avoid the erroneous attribution of causes of failure and success in practical conservation.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Climatic change
NAO
Sahel rainfall index
Population dynamics
Alkaline steppe
Hortobágy
Megjelenés:Climate Research. - 68 : 1 (2016), p. 39-48. -
További szerzők:Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
OTKA K75696
OTKA
Internet cím:Szerző által megadott URL
DOI
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