Animal movement varies with resource availability,landscape configuration and body size: a conceptual model and empirical example     

Doherty  Tim S.  Fist  Charles N.  Driscoll  Don A. 《Landscape Ecology》2019,34(3):603-614

Landscape Ecology - Animals must move to find food, shelter and mates, and escape predation and competition. Changes in landscape configuration and resource availability can disrupt natural...  相似文献   

Spatiotemporal analysis of epiphytotics of downy mildew of oilseed poppy in tasmania, australia     

Scott JB  Hay FS  Wilson CR  Cotterill PJ  Fist AJ 《Phytopathology》2003,93(6):752-757

Downy mildew, caused by Peronospora arborescens, has become the major disease affecting oilseed poppy (Papaver somniferum) since its first record in Tasmania in 1996. Two field trials conducted in 2000 and 2001 studied the progression and spatial distribution of downy mildew epiphytotics. The logistic and exponential models best described the progression of disease incidence and severity, respectively. Incidence and severity increased rapidly following canopy closure. In 2001, incidence increased from 0.16%, prior to canopy closure, to 100% at late flowering (40 days). Spatial analyses of epiphytotics were conducted by fitting the beta-binomial and binomial distributions, median runs analysis, and the spatial analysis by distance indices. All analyses demonstrated that the distribution of incidence and severity was strongly spatially aggregated from canopy closure until at least late flowering. These results suggest that secondary spread from a few primary infections is the major factor in epiphytotics.  相似文献