snowshoe hare and canada lynx worksheet answer key

Movements on a local level might be important, but at the regional level all populations rise and fall in unison. (3)1. PJ hp3 John Bryant at the University of Alaska suggested one attractive qualitative food hypothesis based on secondary chemicals: Shrubs and small trees can fight back against browsers by increasing their content of secondary chemicals such as tannins and resins, which deter digestion in herbivores (To answer this question, we conducted five food-addition experiments during two hare cycles in the southwestern Yukon. For over 300 years, the Hudson Bay Company has been involved in the fur trade in Canada. Author: Created by Teach_Biology. It essentially prevents most birds from swallowing the mantid (anti-swallowing structure).What might the spines on the body of some orb-weaving spiders do?Increase body size/ anti-swallowing structures or discourage parasitic waspsWhat is an example of prey using active defense against predators?1. It was impossible to obtain any juveniles in the summer of 1993. Additional data on survival of hares over two cycles in central Alberta was obtained through mark-and-recapture methods and radiotelemetry (Juvenile survival can be broken down into preweaning survival for the first 30 days of life, and postweaning survival from 30 days to 1 year of age the following April. Sinclair, What Drives the 10-year Cycle of Snowshoe Hares?

. x: free nitrogen is in the atmosphere. Using another color, graph the number of lynx trapped. We do not yet know whether this hypothesis is the correct explanation for the reduced reproduction that occurs during the hare cycleThe chronic stress hypothesis as an explanation of the changes in reproduction that accompany the snowshoe hare cycle. What are some examples of invasive species and what concept to they illustrate in this unit?Marine sea lamprey, feral cats, wooly adelgid, brown tree snake, northern snakehead, arctic fox, humans. Why? The cyclic changes in abundance of the snowshoe hare (Lepus americanus Erxleben, 1777) and the Canadian lynx (Lynx canadensis Kerr, 1792) are well known (1–4).These 9- to 11-year fluctuations are commonly discussed in ecology texts (e.g., refs. I. Demography of food-supplemented populations in the southern Yukon, 1976–84.Impact of food and predation on the snowshoe hare cycle.Nonlethal effects in the ecology of predator–prey interactions.The acute effects of corticosteroids on cognition: Integration of animal and human-model studies.Antenatal glucocorticoids and programming of the developing CNS.Interactive effects of sublethal nematodes and nutritional status on snowshoe hare vulnerability to predation.Numerical responses of coyotes and lynx to the snowshoe hare cycle.Diet choice and nutrition of captive snowshoe hares (Lepus americanus): Interactions of energy, protein, and plant secondary compounds.Owl predation on snowshoe hares: Consequences of antipredator behaviour.Solar activity and mammal cycles in the Northern Hemisphere.Do plant secondary compounds determine feeding preferences of snowshoe hares?.Population biology of snowshoe hares. But food quality and quantity affect body condition and in this way may predispose hares to predation, increased parasite loads, and higher levels of chronic stress. The natural feeding experiment was begun in October 1981 (blue triangle). Food quality clearly limits body condition and population density in hares. Consumption increased markedly during the peak (Alternatively, food quality could change over the cycle. A small sample of … If the predator isocline is to the right of the peak (inefficient predators), then you spiral inwards (pretty stable) but if it is too the left of the hump (efficient predators), then you spiral outwards (very unstable) (both populations fluctuation with increasing amplitude).if a particular population gets less than some threshold (population size), then it does not grow.

The 10-year cycle is a result of the interaction between predation and food supplies, but of these two factors, predation is clearly the dominant process.

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