نتایج جستجو برای: decline
تعداد نتایج: 91073 فیلتر نتایج به سال:
Abbasi Domshahri M. and Ghaderi R. 2019. Causal agents of citrus trees decline in Fars province . Plant Pathology Science 8(1):15-23. DOI: 10.2982/PPS.8.1.15. During recent years, citrus trees decline has becoming one of the most important factors of limiting the area of citrus orchards in the south of Iran including Fars province. Different biotic and abiotic agents were attributed to citr...
We performed a global assessment of how fish biomass has changed over the last 100 yr, applying a previously developed methodology using ecological modeling. Our assessment built on more than 200 food web models representing marine ecosystems throughout the world covering the period from 1880 to 2007. All models were constructed based on the same approach, and have been previously documented. W...
Many economists argue that high mortality is a major restraint on human capital accumulation and, in turn, growth. A short time horizon makes a person less likely to invest. Therefore, having a lower life expectancy reduces the incentive to obtain schooling. However, there is controversy over whether this theoretical effect is empirically important. Most previous research designs have been unab...
An iconic Australian marsupial is under threat from a disease, which is proving a major challenge for conservationists wishing to ensure the survival of the species, the Tasmanian devil. Hannah Robertson reports on their efforts.
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