Showing papers in "Biological Conservation in 1975"

TL;DR: The main conclusions are as follows: the number of species that a reserve can hold at equilibrium is a function of its area and its isolation, and larger reserves, and reserves located close to other reserves, can hold more species.

TL;DR: A logical model is synthesised in the form of a logical model that separates, and examines the relationships of, some of the biological and physical events that occur as a result of trampling.

TL;DR: The species of birds present in 433 wood in Great Britain were recorded during the breeding seasons of 1967 to 1974 as discussed by the authors, and the implications of the work for bird conservation both on farms and in the country as a whole are discussed briefly.

TL;DR: The importance of food preference ratings in range management, habitat evaluation and otherwise is reviewed and there are special values in the rating which results when the percentage in the diet is divided by the percentage availability.

TL;DR: Observations of the behaviour of double-crested cormorants and king shag and dolphin gulls indicate that certain predictable offensive and defensive interactions occur when breeding birds are disturbed, suggesting that interference with normal breeding activities and the resulting reduction in productivity of c Cormorants can be minimised in colonies where human access is carefully regulated.

TL;DR: It is concluded that blueberry fields and their immediate surrounds received doses of the pesticide Fenitrothion, and that crop failures have, in part, been caused by drifts or indiscriminate applications, or both, of the pesticides.

TL;DR: In this article, a scheme for the evaluation of each area utilises the weighted values of climax condition, educational suitability, species significance, community representation, and human impact through multiplicative scoring to give a natural area score.

TL;DR: The invertebrate fauna of grassland litter appears to be affected by levels of trampling much lower than those required to produce changes in the structure and species frequency of living plants.

TL;DR: A positive correlation is demonstrated between primary productivity and the vulnerability to trampling of a range of vegetation types and this relationship could be used to predict vulnerability as an aid to planning and management of recreation areas.

TL;DR: In this article, the authors proposed an index for the relative ecological quality of different areas in the British Isles based on various criteria, such as extent, naturalness, richness and diversity.

TL;DR: It is concluded that these ‘woodland’ species do not spread readily throughout the hedgerow network, and that hedgerows do not appear to act as efficient ‘corridors’ for the passage of such plants.

TL;DR: In this paper, permanent sample plots established in the Galapagos showed that introduced mammals have had a destructive influence on the vegetation; closed forest and scrub have been changed into open vegetation; the plots provided information on the regeneration ability of various types of vegetation.

TL;DR: The bearing of the reproductive isolation of separate island colonies on the survival position of the genus is briefly discussed and stomach contents of 29 mature turtles, killed by shell hunters on Tortuguero Bank, are listed.

TL;DR: Commercial crocodile rearing stations in Rhodesia are described, including regulations which govern their operation, and a ready source of breeding stock is available in ‘problem’ animals which are relocated rather than shot.

TL;DR: In this paper, changes in the quantity of plant material in three salt marsh systems: (1) a pristine unaltered marsh, (2) a marsh grazed by ungulates, and (3) a former grazed marsh was measured periodically over two years.

TL;DR: It is suggested that such low population density brings hazards of local extinction, and that the maintenance of such a system depends on the existence of extensive habitat from which recolonisation can occur, to ensure long-term survival of many of the invertebrate species.

TL;DR: The use of aquatic herbicides in Britain appears to be increasing, and the characteristics of twelve herbicides—diquat, paraquat, dichlobenil, chlorthiamid, terbutryne, dalapon, diuron, asulam, copper sulphate, maleic hydrazide, maleo-hydrazide/2,4-D/chlorpropham, and 2, 4-D amine—are discussed.

TL;DR: The effects of burning on individual species are considered in relation to their biology and the effects of other kinds of management, and a short review of the effects on populations of invertebrate animals is made as mentioned in this paper.

TL;DR: Insects seen on flowers in a small section of the M1 motorway grass verge were sampled at intervals during two consecutive summers and many insects of species that are beneficial to man as crop pollinators or predators of crop pests were present.

TL;DR: Sampling of the benthic fauna showed that dredging operations produced relatively short-term effects on invertebrate population levels, and the behaviour of the animals was immediately affected.

TL;DR: There is a great need for conservation legislation in order to protect certain elements of the Zambezi ecosystem in Mocambo from over-exploitation and ignorance and with sparing use of such legislation, Cabora Bassa could become one of the most important resources in the development of Mocambique.

TL;DR: It is suggested that the incidence of sheep and rabbit grazing, phases of cultivation, and the use of the site for military training, may have had a significant effect on the origins and development of the present-day and animal communities.

TL;DR: La Campana National Park as mentioned in this paper is a new Chilean national park that includes examples of all the major biotic communities of central Chile: Nothofagus forest, hygrophilous forest, sclerophyll forest, matorral, bamboo thicket, succulent scrub, high altitude communities, and palm forest.

TL;DR: A survey of status and distribution throughout the range of the species in Pakistan and relied mainly on the literature for information on the animal in Afghanistan, Russia, and India was made by as discussed by the authors.

TL;DR: Britain's native reptile fauna consists of three lizard species and three snake species, some of which may be unique physiological races (evidence is so far based only on their Critical Minimum temperatures), and fundamental eco-physiological requirements of these animals are being examined in order to maintain or develop optimum habitats on nature reserves and in the hope of establishing viable reptile colonies.

TL;DR: In this article, the effects of hydraulic dredging on the benthic infauna of a mud bottom area were investigated in Georgia in the Atlantic Intracoastal Waterway.

TL;DR: The tropical rainforest of Peninsular Malaysia is under heavy attack from a number of economic activities, the most important of these being tin-mining, the exploitation of the jungle for tropical hardwoods, and the removal of extensive areas of natural forest for agricultural expansion as discussed by the authors.

TL;DR: In this paper, a comprehensive management program, within the context of international cooperation and sound ecological information, can be presented to maintain a high sustained yield and over-exploitation of commercially important fish stocks in Skadar Lake.

TL;DR: In this paper, the authors investigated and emphasised the value of gravel pit wetland habitats as potential conservation areas for breeding bird communities, and suggested that these new wetlands are important for the future conservation of marshland and aquatic species, and may also act as reservoirs of diversity and abundance in rapidly changing environment.