Hare density (histogram) in spring of year t is plotted along with survival rates averaged from spring of year t to t+1 for radio-collared hares in control areas. Indeed, hares across most of Canada and Alaska reached a peak in 1997–1999 during the most recent cycle. Food quality clearly limits body condition and population density in hares. Contains data on the population of hare and lynx. There has been much interest in the indirect effects of predators on prey (What is the role of high-quality food in the hare cycle? For 4 years there were enough females to compare simultaneously the population of females taken from the peak phase of the cycle with those taken from the low phase. h} h} 5�CJ OJ QJ aJ h} h} 5�CJ aJ h} 5�CJ aJ , 6 7 Q R � � [ \ I J � � > ? Search for other works by this author on:

Data from Statistics Canada, as used by Synchrony among pairs of provinces in Canada for lynx fur return data from 1920 to 1987. When the hare population increases, what happens to the lynx population?

When the hare population declines, the lynxes compensate by switching to other prey such as squirrels, gophers, mice and other rodents. Evidence from tree rings and ice cores.Spatial trends in Canadian snowshoe hare, Lepus americanus, population cycles.Population biology of snowshoe hares. For over 300 years, the Hudson Bay Company has been involved in the fur trade in Canada.

If they match up then they are regular and you would know the period lengthWhat were the two main questions posed by the hare-lynx graphs?What might cause cycles in the lynx and hare populations? u\ PJ hp3 Snowshoe hares are not particularly good candidates for social regulation of population size, and most hypotheses about hare cycles have ignored the social dimension (Nevertheless, there remain some puzzles. Low-phase females maintain a lifetime reproductive output much greater than peak-phase females; these lab results mimic the observed changes in field populations.
The large circles define the three regions within which the lynx cycle is most structurally similar. . 4.5 17 customer reviews. The survival rate per 30 days is averaged over each year, with 90% confidence limits, for radio-collared haresChanges in survival rates of snowshoe hare numbers on control and fenced areas during the population cycle of 1988–1996 at Kluane, Yukon. Oxford University Press is a department of the University of Oxford. One form of evidence for the impact of predators in ecological systems -the diversity & ubiquity attest to intense selection pressure by predatorsWhy are the tropics and deep oceans are arenas for intense predator-prey co-evolution(4)Summarize the empirical evidence of the impact of predators on prey populations (5)(show the graphs for the second one).1. The most famous time series drawn together from those records was that of Canada lynx (The spectacular cycles of snowshoe hares and their predators have captured the attention of biologists as well as historians.

Why? There was no correlation in these colony data between the reproductive output of mothers and daughters, suggesting that this effect was not a genetic. The Northern Department occupied most of western Canada. (1995) paper on Canada lynx-snowshoe hare system Conclusions Predator-prey ecological interactions are often dramatic and conspicuous Synchrony falls off with distance and then rises again because British Columbia and the Yukon as well as eastern Canada tend to peak 2–3 years later than the average of central Canada.
Before we describe these details, we should note that these 10-year hare cycles tend to occur in synchrony across broad regions.

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