Marion and Prince Edward Islands: report on the South African biological and geological expedition 1965-66.

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Marion and Prince Edward Islands are amongst the least well known of all the subantarctic islands so it is a pleasure to see this large volume which goes far towards filling the gap. It is unusual today to find a publication covering almost the whole field of natural history and yet maintaining a high scientific standard. This volume is in the tradition of the reports of the famous European scientific expeditions of almost a century ago and is a welcome companion to Chilton's "Subantarctic Islands of New Zealand" and the recent publications on Antarctica.

Problems in studying microbial ecology.

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Often the macrobial ecologist is surprised and a little annoyed when a microbial ecologist refuses or is reluctant to take part in a general ecological survey. The reason is not that microbial ecologists are uncooperative, but rather they are faced with problems that tend to discourage co-operation. Whether interested in autecology, synecology, or habitat ecology (Alexander 1971) the problems tend to be the same and often seem insurmountable.

Effects of the 1969-70 drought on two remnants of indigenous lowland forest in the Manawatu district.

The effects of the 1969-70 drought were studied in two forest remnants near Palmerston North: Bledisloe Park and Keeble's Bush. Mortality occurred among more than 40 percent of the species of trees and shrubs examined. In Bledisloe Park, where mahoe, ngaio, titoki and tawa are the main components, the short-term effect of the drought is considered to be an increase in the cover of titoki and ngaio with reductions in mahoe and tawa.

Engineering and ecology: Engineering and conservation in the Snowy Mountains, Australia.

The Snowy Mountains Hydro-electric and Irrigation Scheme is an example of resource development in which fundamental, ecological values of a natural environment were largely retained. Co-operation between ecologists and engineers and flexibility in planning, which allowed modifications prompted by economic and social changes during the long period of construction, contributed to its success. This suggests that greater harmony in the thinking of engineers and ecologists is possible, and it could well be promoted through examples such as that provided by the Snowy scheme.

Engineering and ecology: A possible set of ecological guidelines for engineers.

An outline of a possible set of ecological guidelines for engineers is given. It is based on the complementary approaches of ecological principles, environmental factors, natural landscape units (their properties and limitations) and uses (their requirements and effects). The emphasis would be on biological factors and interactions