Chinese and European privets are among the most aggressive invasive shrubs in forestlands of the southern United States. We analyzed extensive field data collected by the U.S. Forest Service covering 12 states to identify potential determinants of invasion and to predict likelihood of further invasion under a variety of possible management strategies.

The Top End region of the Northern Territory, Australia, is noted for its relatively unmodified natural state. To gain some insight into the potential for maintaining ecosystem health in this region we undertook a study that assessed the distribution of weeds across very extensive transects. This weed survey was distinct from other studies in that many of the sample sites were distant from tracks or other infrastructure. Twenty-one weed species were recorded along 2000 km of transects. Weeds were reported from 18.7% of the 718 sample points.

Feedbacks between climate warming and fire have the potential to alter Arctic and sub-Arctic vegetation. In this paper we assess the effects and interactions of temperature and wildfire on plant communities across the transition between the Arctic and sub-Arctic. Mackenzie Delta region, Northwest Territories, Canada. We sampled air temperatures, green alder (Alnus viridis ssp. fruticosa) cover, growth, reproduction and age distributions, and overall plant community composition on burned and unburned sites across a latitudinal gradient.

1. A spatially-extensive data set of stream macroinvertebrate communities from 49 northern New Zealand sites sampled over a 10-year period was analysed to assess relationships between the environment (catchment land-cover, landscape position and regional-scale weather patterns), and (i) community persistence and stability based on the constancy of species occurrence (presence-absence) and abundance (per cent composition), respectively and (ii) the temporal variability of various community condition metrics. 2.

In dit rapport wordt een begripsdefinitie en een operationele definitie gegeven van `verrommeling¿. In de 72 1 x 1 km grids, die ook in de Steekproef Landschap worden gebruikt, is een oordeel gegeven aan de mate van verrommeling. Dit is gerelateerd aan het vóórkomen van storende elementen, de uitstraling ervan en aan landschapskenmerken zoals de afwisseling in gebruiksfuncties. Driekwart van de variantie in verrommelingsscore blijkt uit deze bepalende factoren te kunnen worden verklaard.