George L. W. Perry

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Humans have a long history of activity in Mediterranean Basin landscapes. Spatial heterogeneity in these landscapes hinders our understanding about the impacts of changes in human activity on ecological processes, such as wildfire. The use of spatially-explicit models that simulate processes at fine scales should aid the investigation of spatial patterns at(More)
Many different sciences have developed many different tests to describe and characterise spatial point data. For example, all the trees in a given area may be mapped such that their x, y coordinates and other variables, or 'marks', (e.g. species, size) might be recorded. Statistical techniques can be used to explore interactions between events at different(More)
Keywords: Landscape fire-succession model Wildfire regime Succession-disturbance dynamics Mediterranean landscape Pattern-oriented modelling a b s t r a c t We present a spatially explicit Landscape Fire-Succession Model (LFSM) developed to represent Medi-terranean Basin landscapes and capable of integrating modules and functions that explicitly represent(More)
We present a simple framework for classifying mutually exclusive behavioural states within the geospatial lifelines of animals. This method involves use of three sequentially applied statistical procedures: (1) behavioural change point analysis to partition movement trajectories into discrete bouts of same-state behaviours, based on abrupt changes in the(More)
The choice of grain (or resolution) for a landscape study will affect the findings of ecological investigations, so the grain adopted must be explicitly stated. However, stating the grain of the spatial data structure representing a landscape can be difficult as a variety of continuous tessellations or graphs of different regular and irregular geometries(More)
Altered fire regimes in the face of climatic and land-use change could potentially transform large areas from forest to shorter-statured or open-canopy vegetation. There is growing concern that once initiated, these nonforested landscapes could be perpetuated almost indefinitely through a suite of positive feedbacks with fire. The rapid deforestation of(More)
Fire positively and negatively affects food webs across all trophic levels and guilds and influences a range of ecological processes that reinforce fire regimes, such as nutrient cycling and soil development, plant regeneration and growth, plant community assembly and dynamics, herbivory and predation. Thus we argue that rather than merely describing(More)
Human activity has resulted in the emergence of fire-induced forest-shrubland mosaics in many southern temperate forest landscapes. In New Zealand (NZ), this transformation was caused by the introduction of fire to previously very low fire-frequency ecosystems. High levels of seed and seedling predation by exotic mammals and the reduction of avian(More)