One of the leading causes of death for frogs, turtles and snakes is road mortality. A study in Denmark found that amphibians have a 34 to 61 percent chance of being struck when crossing a roadway, and slow-moving turtles ...
Ecology
May 14, 2019
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Human adaptation to climate change may include changes in fertility, according to a new study by an international group of researchers.
Environment
May 03, 2019
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10
Some diseases which are fatal in one species can cause only mild discomfort in another—but it's hard for scientists to predict how lethal a disease will be if it leaps across species.
Ecology
Mar 28, 2019
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Tropical storms are likely to become more deadly under climate change, leaving people in developing countries, where there may be a lack of resources or poor infrastructure, at increased risk, new research from Oregon State ...
Environment
Mar 20, 2019
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48
Two isolated mountain lion populations in southern California's Santa Ana and Santa Monica Mountains are at risk of local extinction, perhaps as soon as within 50 years, according to a study published in the journal Ecological ...
Ecology
Mar 20, 2019
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Puberty is much more than just a time of biological overdrive, propelled by sexual maturation. Progress in developmental science has greatly broadened the perspective of this critical maturational milestone.
Social Sciences
Mar 14, 2019
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Pest control is one of the vital services provided by insects in agroecosystems. Natural methods relying on biological control agents, such as parasitoid wasps, represent a highly effective way to supress crop pest populations. ...
Ecology
Mar 13, 2019
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Heat waves are more dangerous than tornadoes, statistically. They kill more people than sharks, and put more human lives at risk than blizzards, floods or lightning storms. But they lack a certain dramatic flair, making it ...
Earth Sciences
Mar 13, 2019
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78
Extreme temperatures, both cold and hot, bring greater mortality risk to people living in China's rural communities than in urban areas, according to a recent study published in the journal Environmental Health Perspectives. ...
Environment
Mar 12, 2019
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Shorter intervals between primate births are associated with higher mortality rates in offspring, finds a new study of macaque monkeys. The results are consistent with previous research on human birth intervals, suggesting ...
Plants & Animals
Mar 11, 2019
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Mortality rate is a measure of the number of deaths (in general, or due to a specific cause) in some population, scaled to the size of that population, per unit time. Mortality rate is typically expressed in units of deaths per 1000 individuals per year; thus, a mortality rate of 9.5 in a population of 100,000 would mean 950 deaths per year in that entire population. It is distinct from morbidity rate, which refers to the number of individuals in poor health during a given time period (the prevalence rate) or the number who currently have that disease (the incidence rate), scaled to the size of the population.
One distinguishes:
In regard to the success or failure of medical treatment or procedures, one would also distinguish:
Note that the crude death rate as defined above and applied to a whole population can give a misleading impression. The crude death rate depends on the age (and gender) specific mortality rates and the age (and gender) distribution of the population. The number of deaths per 1000 people can be higher for developed nations than in less-developed countries, despite life expectancy being higher in developed countries due to standards of health being better. This happens because developed countries typically have a completely different population age distribution, with a much higher proportion of older people, due to both lower recent birth rates and lower mortality rates. A more complete picture of mortality is given by a life table which shows the mortality rate separately for each age. A life table is necessary to give a good estimate of life expectancy.
This text uses material from Wikipedia, licensed under CC BY-SA
