نتایج جستجو برای: overexploitation
تعداد نتایج: 943 فیلتر نتایج به سال:
In this study, possible sources of extremely high concentrations of arsenic (reaching as high as 561.5 μg/L) in the shallow groundwater of Simav plain, Turkey is studied in order to understand probable mechanisms of contamination. It has been found out that the major source of arsenic in groundwater is arsenic containing geological formations in and around the vicinity of the plain. However, th...
Using data for 25,780 species categorized on the International Union for Conservation of Nature Red List, we present an assessment of the status of the world's vertebrates. One-fifth of species are classified as Threatened, and we show that this figure is increasing: On average, 52 species of mammals, birds, and amphibians move one category closer to extinction each year. However, this overall ...
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...
Economies entirely dependent upon local environmental resources should have a greater incentive to preserve those resources than economies based on specialization and trade. Evidence from history and prehistory, however, shows that many regionally based economies have collapsed because of environmental overexploitation. Evidence from the past shows that there is a strong connection between envi...
Th e acorn woodpecker ( Melanerpes formicivorus ) plays an important role in the history of cooperative breeding. It was one of the earliest species for which cooperative breeding was noted with more than two individuals feeding at a single nest as well as apparent mate-sharing (Myers 1915 ; Leach 1925 ; Michael 1927 ). Subsequently, in his classic Animal Dispersion in Relation to Social Behavi...
The opportunistic character of adaptation through natural selection can lead to evolutionary pathologies--situations in which traits evolve that promote the extinction of the population. Such pathologies include imprudent predation and other forms of habitat overexploitation, or the tragedy of the commons, adaptation to temporally unreliable resources, cheating and other antisocial behavior, in...
Mediterranean temporary ponds (MTPs) comprise an endangered habitat with several endemic species that can be found in many countries, mainly in the Mediterranean region but are disappearing at a high rate. For designing optimal conservation and management strategies for the particular ecosystems, appropriate characterization and classification of these ponds is necessary based on the different ...
Recovery of overexploited marine populations has been slow, and most remain below target biomass levels. A key question is whether this is due to insufficient reductions in harvest rates or the erosion of population resilience. Using a global meta-analysis of overfished stocks, we find that resilience of those stocks subjected to moderate levels of overfishing is enhanced, not compromised, offe...
Despite its economic importance, quarrying activity for the production of natural aggregates (sand, gravel, and crushed stone) can result in overexploitation of the natural environment. This paper investigates the current state of natural and recycled aggregates in Sardinia Italy and how to limit the production of natural aggregates (NA) and increase the use of recycled aggregates (RA). The mun...
In an effort to deliver better outcomes for people and the ecosystems they depend on, many governments and civil society groups are engaging natural resource users in collaborative management arrangements (frequently called comanagement). However, there are few empirical studies demonstrating the social and institutional conditions conducive to successful comanagement outcomes, especially in sm...
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