CEU Electronic Theses and Dissertations, 2012
| Author | Esparrago Llorca, Javier |
|---|---|
| Title | Spatial distribution and habitat preferences of the prairie crocus (Pulsatilla patens) in an urban landscape |
| Summary | The prairie crocus (Pulsatilla patens (L.) Mill.) is a perennial forb whose populations have declined substantially in some parts of the world. In North America it is strongly associated with native prairies, a heavily degraded ecosystem. Despite its sensitivity, P. patens can be found within the city of Saskatoon, Saskatchewan. The aim of this research is to map the distribution of P. patens within Saskatoon and its vicinity and to identify the ecological, physical, and demographical forces that shape its spatial configuration. Nine potential areas were identified and surveyed. The locations of P. patens were mapped and their ecological and physical characteristics were recorded. Spatial data regarding historical and future development of the city was also gathered from several sources. All the collected data was integrated with other sources and analysed statistically in order to reveal trends in the distribution of P. patens. The analysis was divided in four parts: habitat preference, spatial relationship, disturbance and urban growth. Differences with European studies regarding topographical preferences were revealed. Spatial considerations seem to explain the distribution of P. patens better than the type and degree of disturbances. Human population density and proportion of urbanized land were negatively correlated with P. patens population size and density. Exotic species seem to have a detrimental effect on P. patens, although this effect is species dependant and needs further research. Urban development is a key factor in shaping the distribution of this species, especially by the designation of conservation areas. |
| Supervisor | Kricsfalusy, Vladimir |
| Department | Environment Sciences and Policy MSc |
| Full text | https://www.etd.ceu.edu/2012/esparrago-llorca_javier.pdf |
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