Tendances spatio-temporelles de répartition chez les oiseaux hivernants durant 26 ans d'étalement urbain à Québec
|Advisor:||Desrochers, André; Darveau, Marcel|
|Abstract:||Québec City, along with other North American cities, has experienced a very rapid growth in area in the last three decades. We assessed the consequences of urban sprawl on wintering bird trends by determining, among 29 wintering species, those whose trends were correlated to habitat change resulting from urban sprawl. We used data from Christmas Bird Counts (CBC) of Québec City and a series of aerial photos taken between 1978-2003. The Québec Christmas Bird Count territory (a 460 km² circle) is divided in 75 census plots. In order to study land use trends of these plots we scanned and georeferenced 6 series of aerial photos taken between 1978 and 2003 and measured “Green” (parks, residential zones, etc.) and “Grey” (industrial, commercial, etc.) urban areas, agricultural lands, fallow lands and forest patches. We proceeded in two steps. First, we calculated a specific habitat area index for each census plot, species, and year of the study (this habitat index took into account species associations to each land use). Then we measured the relationship between population trends and corresponding habitat change for 1) all the species and 2) individual species. Most species were associated to « green » urban areas and avoided agricultural areas. A large number of species showed a significant habitat gain. Species that had the highest habitat gains showed the highest increase in their population trends. Population trends for at least seven species were strongly associated with local habitat change. However, in most species, association explained by urban sprawl per se is not clear, numerous factors could play a major role in population trends.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||12 April 2018|
|Collection:||Thèses et mémoires|
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