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Impact du virus du Nil occidental sur les caractéristiques de la population de corneilles au Québec
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ludwig, Antoinette |
| Copyright Year | 2009 |
| Abstract | West Nile Virus (WNV) infection is a zoonotic disease that appeared in North America in August 1999. Since then, it has spread throughout the continent. West Nile Virus infection is transmitted by a mosquito, and birds play the role of reservoir. The American crow (Corvus brachyrhynchos) is a large, easily recognized and common bird, very sensitive to the WNV. It was designated as a sentinel for WNV virus circulation in North America by Public Health authorities. However, many elements are still missing in the comprehension of the American crow population dynamics, which makes interpreting WNV effects on this population rather difficult. The principal objective of this PhD thesis is to improve our knowledge on crow population biology and dynamics , in Quebec by analyzing two kinds of data. The first type of data corresponds to the 2005 WNV surveillance data in Quebec for crow mortality. The second type of data corresponds to the live crow observations data collected in southem Quebec from 1990 to 2005. With the surveillance data, we analyzed morphological characteristics of crow populations in Quebec and explored risk factors associated with baseline and WNV specific mortality. Regarding live crow data, we described natural population dynamics with spectral analysis. By comparing expected values from normal population dynamics with observed values during the WNV active years in Quebec, we were able to evaluate the WNV impact on crow populations. We observed that crow populations in Quebec were morphologically different depending on age and sex group. Age and period of year were significant risk factors associated with baseline mortality variations and WNV positive mortality variations. Territory characteristics (urban or non urban) seem to play a major role in natural crow population dynamics. The impact of West Nile Virus on crow population dynamics was more important in 2003 than in 2004 and 2005. This work contributes to our comprehension of mortality data collected during the WNV surveillance programmeme in Quebec in 2005. It also gives us an original and |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://papyrus.bib.umontreal.ca/xmlui/bitstream/handle/1866/6401/Ludwig_Antoinette_2009_these.pdf;jsessionid=1B186B05FED19E6FE0A6C770BFEA7517?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
