منابع مشابه
Long-Term Decline in Freshwater Mussels (Bivalvia: Unionidae) of the Western Basin of Lake Erie
Long-term trends in the abundance of unionids in the western basin of Lake Erie were examined from data collected at 17 stations in 1961, 1972, and 1982. The mean number of unionids at these stations declined over this time period, decreasing from 10 m~2 in 1961, to 6 m~2 in 1972, down to 4 m~2 in 1982. This decline in abundance was reflected in the decrease in the number of stations where muss...
متن کاملPrehistoric Decline in Freshwater Mussels Coincident with the Advent of Maize Agriculture
During late prehistory, high population densities and intensive agricultural practices of Native American societies had profound effects on the pre-Columbian landscape. The degree to which Native American land use affected aquatic ecosystems is unknown. Freshwater mussels are particularly sensitive harbingers of modern-day ecosystem deterioration. We used data from prehistoric Native American s...
متن کاملMultiple drivers of decline in the global status of freshwater crayfish (Decapoda: Astacidea)
Rates of biodiversity loss are higher in freshwater ecosystems than in most terrestrial or marine ecosystems, making freshwater conservation a priority. However, prioritization methods are impeded by insufficient knowledge on the distribution and conservation status of freshwater taxa, particularly invertebrates. We evaluated the extinction risk of the world's 590 freshwater crayfish species us...
متن کاملTawwaj, from flourishing to decline
The historical city of Tawwaj, in the northern hinterland of the Persian Gulf, has long been one of Iran's most recognized cities. The boom of this city was during the period of Buyids, but then it quickly deteriorated. There is now nothing left of this town except a name in ancient texts and even the ruins of the city are unknown. This article examines the birth and continuity of this city and...
متن کاملGlobal biodiversity decline of marine and freshwater fish: A cross-national analysis of economic, demographic, and ecological influences
We test competing hypotheses from political–economic and neo-liberal theories about the effects of economic growth and urbanization on a neglected, but important, indicator of environmental health: aquatic biodiversity. We analyze crossnational data on the number of threatened fish species within national territorial waters using negative binomial regression. We find that, counter to the expect...
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ژورنال
عنوان ژورنال: Policy Quarterly
سال: 2019
ISSN: 2324-1101,2324-1098
DOI: 10.26686/pq.v15i3.5682