Showing papers in "Biological Conservation in 1980"

TL;DR: It is concluded that incubation of eggs in styrofoam boxes runs the risk of masculinising turtle populations, and that other practices may effect sex ratio in ways that cannot yet be specified.

TL;DR: In this paper, the authors investigated the long-distance effects of road traffic on birds and found that the relationship between traffic volume and total population loss is possibly logarithmic.

TL;DR: Based on studies of brown pelicans Pelecanus occidentalis californicus and Heermann's gulls Larus heermanni, disturbances by recreationists, educational groups, local fishermen and scientists alike can be seriously disruptive and damaging to breeding seabirds in the Gulf of California and off the west coast of Baja California as discussed by the authors.

TL;DR: Information was obtained on how close passerines tolerate an approaching human before flying away, and there was a significant association between degree of tolerance and size, with small birds,such as tits, allowing a closer approach than larger species, such as corvids.

TL;DR: There is relatively more information on the effects of recreational activities on plants than on animals, but the authors consider that further research is required in both fields.

TL;DR: Wild ungulate population densities varied in relation to habitat diversity; large herbivores were most numerous where early and intermediate successional stages intergraded with one another and only sparsely distributed in continuous climax sal Shorea robusta forest.

TL;DR: In this paper, the adequacy of the reserve system in the Western Australian wheatbelt for the conservation of lizards was evaluated in detail, and it was shown that 75% of the variation observed in lizard species richness between reserves is accounted for by the algorithm of the number of vegetation associations on these reserves; adding other reserve variables examined (including area) does not significantly increase this explained variation.

TL;DR: In this paper, three nature reserves in the Western Australian wheatbelt were examined in an attempt to assess their conservation value for native mammals, excluding bats, and multiple regression analysis on log transformed data showed that 72% of the observed variation in mammal species richness between reserves was accounted for by reserve size.

TL;DR: Buried germinable seed densities have been measured at several successional sites on the Magnesian limestone in County Durham, England, and the results conform with the prediction that the density of buried seeds will decline during succession as discussed by the authors.

TL;DR: Dealing with ecological change requires statement of preservation goals, priorities, and clear policy on key issues; in addition, resource inventory, monitoring, and management-oriented research are required.

TL;DR: In this article, the distribution and abundance of freshwater fishes in Iran are described and conservation schemes are outlined and commented on and a list of threatemed fishes is given, as well as a threat list of fishes.

TL;DR: On a basis of pitfalltrap captures, a scheme for utilising such information about carabid communities in a classification of habitats is proposed, and the information obtained has made a valuable contribution to existing habitat classification systems.

TL;DR: The changes which have taken place on the heathlands of the Poole Basin from their origin in the late Bronze Age until the present time are described in this article, where vegetation characteristics, species distributions, physical features and land use and management are described.

TL;DR: It is suggested that social factors, namely colony size and reproductive success, were related in such a way that, though the passenger pigeon was apparently still quite common, its breeding rate was insufficient to offset mortality.

TL;DR: In the Port Canaveral Ship Channel, off the East Coast of Florida, large numbers of torpid loggerhead turtles Caretta caretta were taken by shrimp trawlers during the winter of 1978 as mentioned in this paper.

TL;DR: Yew was widespread but uncommon during the postglacial period, though planting has extended its natural range and abundance as mentioned in this paper, and it is now common on the chalk hills of southern England as a dominant or minor species.

TL;DR: In this article, it is suggested that fire may have been responsible for the elimination of a fynbos tree element, and that a longer period (probably ± 40 years) between fires may be more applicable than the present 8-12 year regime advocated.

TL;DR: In this article, a method is described which was used to classify the ornithological interest of more than 3,000 sites in Britain according to their importance for conservation, and each site was assigned to the highest level of importance derived from the application of the criteria to the data.

TL;DR: More than 80% of the beach nesting seabirds in coastal Virginia nest on natural barrier island beaches, while in New Jersey the vast majority nest on dredge deposition material or natural marsh islands as discussed by the authors.

TL;DR: Transplanting whole and partially preyed-upon nests on Kiawah or Cedar Islands in 1972, 1973, 1977 and 1978 may be an easier, less expensive method for protection of nests from predation or erosion than other procedures such as predator control, chemical aversion conditioning, or hatcheries.

TL;DR: Indirect evidence is presented that human disturbances are having a profound effect on reproductive efforts of Larus occidentalis livens at several colonies in the Gulf of California, and attempts to assess breeding success seem warranted and some action to regulate human contact may be essential.

TL;DR: The rubiaceous shrub Oldenlandia adscensionis has become extinct and three other species are possibly extinct and it is probable that further extinction will follow.

TL;DR: In this paper, a case study in two ecological types of Danish sand dunes, the grey and the white dune, showed that dominant growth morphology and initial pattern of recovery are inter-related.

TL;DR: Buddleia davidii was introduced to Britain in the 1890s and began to colonise waste land and building sites in the 1930s, and now occurs in almost every town, especially on calcium-rich soil to which it is highly tolerant.

TL;DR: It is suggested that modern works can be important bird habitats, particularly as feeding sites for several passerine species, and those systems with percolating filters and tertiary treatment by surface irrigation are likely to support the most varied bird communities.

TL;DR: In this article, a comparison of adjacent vegetated and non-vegetated seaward-facing dune slopes illustrates some of the problems associated with stabilisation by artificial planting.

TL;DR: In this article, an index is described which provides an indication of the relative importance of sites for wildfowl, based on wild fowl usage, species rarity and species diversity.

TL;DR: The fisheries of the River Nzoia in Western Kenya depend largely on seasonal flooding regimes which result in the ascent of migrant fishes from Lake Victoria as mentioned in this paper, and recent data on some physico-chemical features of the river, as well as other factors which may possibly endanger the fishery.

TL;DR: It is suggested that areas rich in species should be grazed by cattle immediately before those poor in species if it is desired to assist immigration of dicotyledonous species.