Peter R. Espie

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Changes in vegetation from 1990 to 2000 were examined at 10 high country localities, representing four grassland types: fescue tussock (Festuca novae-zelandiae), snow tussock (Chionochloa rigida), red tussock (C. rubra), and silver tussock (Poa cita). At each locality, three treatments were established: ambient sheep+rabbit grazing, rabbit grazing only, and(More)
This study investigated the effects of different management inputs (fertiliser and seed) and grazing patterns on plant biodiversity in a short tussock grassland with a strong Hieracium pilosella component. Cover abundance of vascular and non-vascular plants and environmental variables were measured in 32 10×10-m plots located in five blocks with different(More)
In isolated hepatocytes incubated in hypoosmotic media, a large increase in the mitochondrial volume is not directly involved in the activation of respiration. Moreover, results of the quantification of the various bioenergetic parameters are not in accordance with an activation of the respiratory chain as previously proposed (Halestrap, A.P. (1989)(More)
New Zealand Journal of Ecology (1994) 18 (1): 69-81 ©New Zealand Ecological Society These two scientific Societies appreciate the opportunity to comment on the important question of sustainable land management for the South Island high country. We recognise that considerable thought has been put into the questions we have been posed. We also recognise that(More)
On isolated mitochondria, numerous studies of the relationships between fluxes and their associated forces have led to the description of some properties of the oxidative phosphorylation pathway. However whether such an approach can be applied to understanding the actual situation in intact living cells needs further consideration. In this study on isolated(More)
In grasses, ligules compress and permanently crimp emerging leaf-blades (primary crimping). Ligule compression may also mark the abaxial surface of older leaves in some species (secondary crimping). Secondary crimping appears directly related to leaf daily growth rate. Leaf-blade crimping can be used for determination of relative tissue age and as a natural(More)
The wet, warm West Coast climate favours tree production and pastures. Much of the land remains in indigenous forest under the control of Government agencies. In the more accessible parts of this land, and in land held under private ownership, we explore the feasibility of “farming” two examples of native biodiversity. Sphagnum moss production varies with(More)
This study was designed to investigate the energetics of isolated rat hepatocyte swelling due to sodium-cotransported amino acid accumulation in a medium containing either glucose or octanoate as basal substrate. We show that the size of the increase in cytosolic volume is directly correlated with the total amino acid accumulation, which depends on the(More)
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