Plot of the number of lynx and hare pelts (in thousands) collected by the Hudson’s Bay Company between 19. lynx_hare_df <-Įxample rows (with their indexes) from the long-form data frame for number of pelts taken by the Hudson’s Bay Company in the years 1900 to 1920 (in thousands). provides numerical data for the number of pelts collected by the Hudson’s Bay Company in the years 1900-1920, which we have included in comma-separated value (CSV) form in the source repository with the case study. Mahaffy’s (2010) lecture notes on mathematical modeling for his San Diego State University course (Math 636), which in turn cites Purves, Sadava, Orians, and Heller’s book, Life: The Science of Biology. Howard (2009) 4 4 Howard (personal communication) traces the numerical data to Joseph M. Hewitt also discusses many other species hares and lynxes occupy only a small part of a single chapter. The models we consider here for illustrative purposes will not consider any of these factors, though they could be extended to do so through the usual strategy of the inclusion of covariates (see the exercises). Hewitt even discusses measurement confounders such as the fact that lynx are easier to trap when they are hungry and weak, which is correlated with a relative decline in the hare population. © Scribner’s Sons 1921 Hewitt’s discussion ranges over many natural factors affecting the population sizes, such as plagues, migrations, and weather-related events. The fluctuations are irregular and the linear growth in rabbits after 1830 appears to be an artifact of interpolation. 3 3 Graph from (Hewitt 1921) showing the numbers of pelts captured by the Hudson’s Bay Company. In the early 20th century, records of the number of lynx and hare pelts traded by Hudson’s Bay were analyzed by biologist Charles Gordon Hewitt.įollowing up on the original source, Hewitt (1921) provides plots of the number of pelts collected by the Hudson’s Bay Company, the largest fur trapper in Canada, between the years of 18. The rise and fall in numbers of snowshoe hares and Canada lynx was observed more than two hundred years ago by trappers working for Hudson’s Bay Company, which was once heavily involved in the fur trade. Rogers (2011) writes about the long history of population dynamics,

Canadian lynxes, a feline predator whose diet consists largely of snowshoe hares.snowshoe hares, an hervivorous cousin of rabbits, and.The species of interest in this case study are

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