نتایج جستجو برای: biodiversity loss
تعداد نتایج: 478085 فیلتر نتایج به سال:
Important biological causes of the loss of biological diversity include the loss of habitats, the introduction of exotic species, over-harvesting of biodiversity resources, and homogenisation of species in agriculture. The common factor of all these elements is that they are human-driven. This paper analyzes the economic and social root causes behind biodiversity loss. The analysis is based on ...
BACKGROUND Recent investigations suggest that biodiversity loss might impair the functioning and sustainability of ecosystems. Although deep-sea ecosystems are the most extensive on Earth, represent the largest reservoir of biomass, and host a large proportion of undiscovered biodiversity, the data needed to evaluate the consequences of biodiversity loss on the ocean floor are completely lackin...
Introduction Biodiversity conservation has traditionally been seen as problem of protecting genetic diversity. It has had two dimensions: ex situ germ plasm preservation in zoos, aquaria and arboreta (and by extension, seed banks, tissue cultures and genomic libraries), and in situ species preservation in refugia, especially in megadiversity areas involving high levels of endemism. Increasingly...
Declining biodiversity is a major environmental problem everywhere on Earth, including developed regions such as Western Europe and the USA. European leaders have recognized this and set the target of halting biodiversity loss by 2010, under the EU Strategy for Sustainable Development that was adopted by the European Council in 2001. World leaders agreed upon a substantially less ambitious goal...
The United Nations declared 2010 to be the International Year of Biodiversity to celebrate biodiversity, increase understanding about how biodiversity is critical for sustaining life on Earth, and to highlight the ongoing and increasing loss of biodiversity. The emphasis of this campaign is on people and biodiversity, and the monetary value of biodiversity in terms of goods and services, rather...
The past two decades have seen extensive analyses of the taxonomic severity of major biodiversity crises in geologic time. In contrast, we propose here an alternative analysis of the ecological severity of biodiversity crises. It is clear that the ecological impacts of the five Phanerozoic biodiversity crises were not all the same. Ranking the five Phanerozoic biodiversity crises by ecological ...
Control of human infectious disease has been promoted as a valuable ecosystem service arising from the conservation of biodiversity. There are two commonly discussed mechanisms by which biodiversity loss could increase rates of infectious disease in a landscape. First, loss of competitors or predators could facilitate an increase in the abundance of competent reservoir hosts. Second, biodiversi...
Human-dominated marine ecosystems are experiencing accelerating loss of populations and species, with largely unknown consequences. We analyzed local experiments, long-term regional time series, and global fisheries data to test how biodiversity loss affects marine ecosystem services across temporal and spatial scales. Overall, rates of resource collapse increased and recovery potential, stabil...
Understanding the impacts of biodiversity loss on ecosystem functioning and services has been a central issue in ecology. Experiments in synthetic communities suggest that biodiversity loss may erode a set of ecosystem functions, but studies in natural communities indicate that the effects of biodiversity loss are usually weak and that multiple functions can be sustained by relatively few speci...
In 2002, world leaders committed, through the Convention on Biological Diversity, to achieve a significant reduction in the rate of biodiversity loss by 2010. We compiled 31 indicators to report on progress toward this target. Most indicators of the state of biodiversity (covering species' population trends, extinction risk, habitat extent and condition, and community composition) showed declin...
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