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The Devils Hole pupfish (Cyprinodon diabolis) is a critically endangered species of the family Cyprinodontidae (pupfishes) found only in Devils Hole, a water-filled cavern in the US state of Nevada. It was first described as a species in 1930 and is most closely related to C. nevadensis and the Death Valley pupfish ( C. salinus ).
Thomas Robert Malthus, after whom Malthusianism is named. Malthusianism is a theory that population growth is potentially exponential, according to the Malthusian growth model, while the growth of the food supply or other resources is linear, which eventually reduces living standards to the point of triggering a population decline.
Malthus wrote that all life forms, including humans, have a propensity to exponential population growth when resources are abundant but that actual growth is limited by available resources: "Through the animal and vegetable kingdoms, nature has scattered the seeds of life abroad with the most profuse and liberal hand. ...
The Devils Hole pupfish reached a 25-year high spring count of 191 fish. For years, the fish’s population dwindled, hitting an “all-time low of 35 in 2013,” the National Park Service said in ...
A commentary on Malthus's 1798 Essay on Population as social theory. Mellon Press. Evans, L.T. 1998. Feeding the ten billion – plants and population growth. Cambridge University Press. Paperback, 247 pages. Klaus Hofmann: Beyond the Principle of Population. Malthus' Essay. In: The European Journal of the History of Economic Thought.
Devils Hole is a geologic formation located in a detached unit of Death Valley National Park and surrounded by the Ash Meadows National Wildlife Refuge, in Nye County, Nevada, in the Southwestern United States. Devils Hole is habitat for the only naturally occurring population of the endangered Devils Hole pupfish (Cyprinodon diabolis).
The beginning of population dynamics is widely regarded as the work of Malthus, formulated as the Malthusian growth model. According to Malthus, assuming that the conditions (the environment) remain constant ( ceteris paribus ), a population will grow (or decline) exponentially .
Malthus also notes that the checks on the human population are more complicated than those on animals and plants. [25] Malthus explains, for example, that a human check on population growth is the conscious decision not to reproduce because of financial burden. [25] Malthus then explains that the main check on population growth is food.