A unique combination of nature and science education and large-scale scientific research, the Monarch Larva Monitoring Project is the only long-term, systematic nationwide study of population fluctuations in this species of insect.
32.
It is possible, Fricke says, that this alarming decline is the result of a natural population fluctuation or an emigration of coelacanths away from the survey area, but it seems much likelier that human predation is responsible.
33.
From Gordon Hewitt's 1921 book " The Conservation of the Wildlife of Canada ", Elton noticed the Canadian lynx and snowshoe hare population cycles, and developed a greater understanding of population fluctuations in Arctic vertebrates with the Hudson's Bay Company.
34.
There are no predators that specialize on Mormon crickets, which may be explained by the cricket's migratory habits and large population fluctuations . " Gordius robustus ", a species of horsehair worm, is a parasite of the Mormon cricket, as is " Ooencyrtus anabrivorus ".
35.
Although Malthus's book, " An Essay on the Principle of Population ", dealt only with the economy of human population fluctuations, which he theorized as being related to finite food resources, abundance and decadence, it gave inspiration to Charles Darwin for the theoretical basis of his seminal work, " The Origin of Species ."
36.
Over two thousand abandoned villages had been recorded nationally during the 14th and 15th century with varied reasons for desertion, including economic viability, change in land use, population fluctuation or as a result of widespread epidemics such as the Black Death . ( As a point of interest, this particular epidemic accounted for the death of nearly 60 % of the estimated population of the Deanery of Doncaster ).
