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Figures for the death toll vary widely by area and from source to source, and estimates are frequently revised as historical research brings new discoveries to light. Most scholars estimate that the Black Death killed up to 75 million people [5] in the 14th century, at a time when the entire world population was still less than 500 million.
Black Death. The Black Death was a bubonic plague pandemic that occurred in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [2] perished, perhaps 50% of Europe's 14th century population. [3] The disease is caused by the bacterium Yersinia pestis and spread by fleas and through the ...
The Black Death tapered off in the eighteenth century, and according to McCormick, a rat-based theory of transmission could explain why this occurred. The plague(s) had killed a large portion of the human host population of Europe and dwindling cities meant that more people were isolated, and so geography and demography did not allow rats to ...
The environment can directly affect the survival of a small population. Some detrimental effects include stochastic variation in the environment (year to year variation in rainfall, temperature), which can produce temporally correlated birth and death rates (i.e. 'good' years when birth rates are high and death rates are low and 'bad' years when birth rates are low and death rates are high ...
Minimum viable population (MVP) is a lower bound on the population of a species, such that it can survive in the wild. This term is commonly used in the fields of biology, ecology, and conservation biology. MVP refers to the smallest possible size at which a biological population can exist without facing extinction from natural disasters or ...
In its broadest sense, social vulnerability is one dimension of vulnerability to multiple stressors and shocks, including abuse, social exclusion and natural hazards. Social vulnerability refers to the inability of people, organizations, and societies to withstand adverse impacts from multiple stressors to which they are exposed.
Warfare and enslavement also contributed to disease transmission. Because their populations were historically hygienic and had not been previously exposed to most of these infectious diseases, the Native American people rarely had individual or population acquired immunity and consequently suffered very high mortality.
Epidemiological transition. Diagram showing sharp birth rate and death rate decreases between Time 1 and Time 4, the congruent increase in population caused by delayed birth rate decreases, and the subsequent re-leveling of population growth by Time 5. In demography and medical geography, epidemiological transition is a theory which "describes ...