排序方式: 共有57条查询结果,搜索用时 15 毫秒
51.
Poliana Cardoso-Gustavson Francine Faia Fernandes Edenise Segala Alves Mariana Pereira Victorio Barbara Baesso Moura Marisa Domingos Caroline Albuquerque Rodrigues Andreza Portella Ribeiro Catarina Carvalho Nievola Ana Maria G Figueiredo 《Environmental science and pollution research international》2016,23(2):1779-1788
52.
Because many species have not been described and most species ranges have not been mapped, conservation planners often use surrogates for conservation planning, but evidence for surrogate effectiveness is weak. Surrogates are well‐mapped features such as soil types, landforms, occurrences of an easily observed taxon (discrete surrogates), and well‐mapped environmental conditions (continuous surrogate). In the context of reserve selection, the idea is that a set of sites selected to span diversity in the surrogate will efficiently represent most species. Environmental diversity (ED) is a rarely used surrogate that selects sites to efficiently span multivariate ordination space. Because it selects across continuous environmental space, ED should perform better than discrete surrogates (which necessarily ignore within‐bin and between‐bin heterogeneity). Despite this theoretical advantage, ED appears to have performed poorly in previous tests of its ability to identify 50 × 50 km cells that represented vertebrates in Western Europe. Using an improved implementation of ED, we retested ED on Western European birds, mammals, reptiles, amphibians, and combined terrestrial vertebrates. We also tested ED on data sets for plants of Zimbabwe, birds of Spain, and birds of Arizona (United States). Sites selected using ED represented European mammals no better than randomly selected cells, but they represented species in the other 7 data sets with 20% to 84% effectiveness. This far exceeds the performance in previous tests of ED, and exceeds the performance of most discrete surrogates. We believe ED performed poorly in previous tests because those tests considered only a few candidate explanatory variables and used suboptimal forms of ED's selection algorithm. We suggest future work on ED focus on analyses at finer grain sizes more relevant to conservation decisions, explore the effect of selecting the explanatory variables most associated with species turnover, and investigate whether nonclimate abiotic variables can provide useful surrogates in an ED framework. 相似文献
53.
de Medeiros PM de Almeida AL da Silva TC de Albuquerque UP 《Environmental management》2011,47(3):410-424
Wood resources are often used to support the needs of the local population. In order to protect biodiversity and resources,
conservation strategies need to consider what types of wood use have the strongest impacts on forested areas. This study aimed
to identify the use categories that put higher pressure on an Atlantic forest region located in the municipality of Igarassu
in Pernambuco, northeastern Brazil. To conduct the study, we measured the volume of all wood products in 62 surveyed residences
and registered the average replacement time for such products. The fuelwood category was most important locally and accounted
for 92% of annual wood consumption. However, the construction category harvests more destructively and concentrates on the
consumption of a few wood species. Therefore we recommend the fuelwood category to be the main focus of conservation effforts.
In addition, the most important species for construction purposes (e.g., Eschweilera ovata (Cambess.) Miers, Apuleia leiocarpa (Vogel) J.F. Macbr. and Pogonophora schomburgkiana Miers ex Benth) should also be considered as a priority for conservation. 相似文献
54.
This article focuses on developing a sustainable tourism in small Caribbean islands, defined here as those that have populations
of fewer than 500,000. Such islands share a very fragile ecology and a high dependence on tourism. They differ in their degree
of tourist penetration and visitor density and the related degree of environmental degradation.
To explain the link between tourism intensity and ecological vulnerability, the so-called “destination life-cycle model” is
presented. This suggests that islands pass through three primary stages of tourist development low-density exploration, rapid
growth and consolidation, and high-density maturation involving the substitution of man-made for natural attractions.
A broad empirical test of the model is performed through a quantitative examination of the tourism characteristics and visitor
densities of a cross section of 23 small Caribbean islands. The three basic stages or tourism styles are identified: low-impact
emerging areas, high-density mass-market mature destinations, and rapidly growing intermediate islands in between. Some broad
strategies consistent with the systems framework for a sustainable tourism with moderate densitites are briefly explored.
An earlier version of this article was presented to Caribbean Conservation Association Conference on Economics and the Environment.
Barbados, West Indies, 6–8 November, 1989. 相似文献
55.
Davis Lodinikki Lemoy Aragão Walessa Alana Bragança de Oliveira Lopes Géssica Eiró Luciana Guimaraes Freire Alexandre Rodrigues Prado Felippe Bevilacqua Rossi Ana Cláudia da Silva Cruz Allan das Graças Fernandes Dantas Kelly Albuquerque Alan Rodrigo Leal Paz Simone Patricia Aranha Angélica Rômulo Simões Lima Rafael Rodrigues 《Environmental science and pollution research international》2022,29(10):13930-13940
Environmental Science and Pollution Research - There are a few data relating to the effects of lead (Pb) exposure on the alveolar bone, which has very distinct morphophysiological characteristics... 相似文献
56.
Nicácio Pedro H. M. Severo Amanda M. C. Barros Ana B. S. Albuquerque Ananda K. C. Wellen Renate M. R. Koschek Katharina 《Journal of Polymers and the Environment》2022,30(9):3840-3851
Journal of Polymers and the Environment - Poly(lactic acid) (PLA) and PLA/5% Babassu compounds were molten mixed, afterwards aged at temperatures ranging from 50 to 90 °C during 15 to... 相似文献
57.
Araujo Thalita Fonseca Silva Luciano Paulino 《Journal of Polymers and the Environment》2022,30(7):2751-2758
Journal of Polymers and the Environment - Lack of biomaterials feasible for three-dimensional (3D) biofabrication and the limited capability to sterilize some of these items are current gaps that... 相似文献