Summary
We show that Alaskan woody plants respond to browsing in two ways that might destabilize a plantherbivore interaction and account for snowshoe hare population ‘cycles’. (1) Browse production of preferred, earliersuccessional woody plants increases in response to moderate levels of browsing. Such yield increases are potentially destabilizing. Later successional woody plants show decreases in yield after moderate browsing, which is consistent with the persistence of snowshoe hares in late successional ‘refuge’ habitats (Keith 1966, Wolff 1980). (2) Many woody plants are destructively overbrowsed or girdled at the peak of the snowshoe hare cycle. The more palatable and plastic, early to mid successional plants respond by sprouting accompanied by juvenile reversion. Sprouts are markedly less palatable than mature shoots. We show here that sprout palatability and twig biomass are restored in 2–3 years for earlier successional plants, but palatability may not recover for 4–10 years in sprouts of some mid to late successional plants. The decrease in palatability helps to account for the snowshoe hare ‘crash’ (assuming that damage to more palatable plants is widespread during the ‘peak’), and the 2–3 year time lag for recovery of more palatable species could account for (May 1974) the observed 8–11 year period of the hare cycles. Browse yield increases acting during the snowshoe hare population nadir and increase, and sprouting with juvenile reversion acting during the hare peak and decline can in principle account for the oscillatory nature and the observed 8–11 year periodicity of the snowshoe hare cycle.
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References
Aldous CM, Aldous SE (1944) The snowshoe hare-a serious enemy of forest plantations. J For 42:88–94
Baker FS, Korstian CF, Fetherolf NJ (1921) Snowshoe rabbits and conifers in the Wasatch Mountains of Utah. Ecology 2:304–310
Beddington JR, Free CA, Lawton JH (1975) Dynamic complexity of predator-prey models framed in difference equations. Nature 255:58–60
Beddington JR, Free CA, Lawton JH (1976) Concepts of stability and resilience in predator-prey models. J Anim Ecol 45:791–816
Bider JR (1961) An ecological study of the Lepus americanus. Can J Zool 39:81–103
Bookhout TA (1965) The snowshoe hare in upper Michigan: its biology and feeding coactions with white-tailed deer. Mich Dept Conserv Res and Develop Report No 38, 191 p
Bryant JP (1981a) Phytochemical deterrence of snowshoe hare browsing by adventitious shoots of four Alaskan trees. Science 213:889–890
Bryant JP (1981b) The regulation of snowshoe hare feeding behavior during winter by plant antiherbivore chemistry. In: Myers K, Mac Innes CD (eds) Proc Int Lagomorph Confer (Guelph, Ontario, Canada, 1979)
Bryant JP, Kuropat PJ (1980) Selection of winter forage of subarctic browsing vertebrates: The role of plant chemistry. Annu Rev Ecol Syst 11:261–285
Bryant JP, Chapin FS III, Klein DR (1983a) Carbon/nutrient balance of boreal plants in relation to vertebrate herbivory. Oikos 40:357–368
Bryant JP, Wieland GD, Reichardt PB, Lewis VE, McCarthy MC (1983b) Pinosylvin methyl ether deters snowshoe hare feeding on green alder. Science 222:1023–1025
Caughley G (1976) Plant-herbivore systems. In: May RM (ed) Theoretical Ecology, Philadelphia: WB Saunders, pp 94–113
DeVos A (1964) Food utilization of snowshoe hares on Manitoulin Island, Ontario. J For 62:238–244
Dolbeer RA, Clark WR (1975) Population ecology of snowshoe hares in the central Rocky Mountains. J Wild Manage 39:535–549
Donald CM (1963) Competition among crop and pasture plants. Adv Agronomy 15:1–118
Errington PL (1956) Factors limiting higher vertebrate populations. Science 124:304–307
Ferguson RB, Basile JV (1966) Topping stimulates bitter brush top growth. J Wildl Manage 30:839–841
Finerty JP (1980) The population ecology fo cycles in small mammals. New Haven, CT: Yale UP
Fox JF (1978) Forest fires and the snowshoe hare-Canada lynx cycle. Oecologia (Berlin) 31:349–374
Fox JF, Chapin FS III, Bryant JP (manuscript). Woody plant resistance to snowshoe hares: growth responses to simulated browsing
Freeland WJ (1974) Vole cycles: another hypothesis. Am Nat 108:238–245
Freeland WJ, Janzen DH (1974) Strategies in herbivory by mammals: the role of plant secondary compounds. Am Nat 108:269–289
Grange WB (1949) The way to game abundance. New York: Scribner's 365 p
Grange WB (1965) Fire and tree growth relationships to snowshoe rabbits. Proc Annu Tall Timbers Fire Ecol Conf 4:110–125
Hassell MP (1978) The Dynamics of Arthropod Predator-Prey Systems. Princeton, NJ: Princeton UP
Hassell MP, May RM (1973) Stability in insect host-parasite models. J Anim Ecol 42:693–726
Heinselman ML (1973) Fire in the virgin forests of the Boundary Waters Canoe Area, Minnesota. Quartern Res 3:329–382
Holiday R (1960) Plant populations and crop yield. Nature 186:22–24
Jameson DA (1963) Response of individual plants to harvesting. Bot Rev 29:532–594
Keith LB (1963) Wildlife's Ten-Year Cycle. Madison: Univ. Wisconsin Press
Keith LB (1966) Habitat vacancy during a snowshoe hare decline. J Wildl Manage 30:828–832
Keith LB (1974) Some features of population dynamics in mammals. Proc Intern Congr Game Biol, Stockholm 11:17–58
Keith LB (1983) Role of food in hare population cycles. Oikos 40:385–395
Keith LB, Windberg LA (1978) A demographic analysis of the snowshoe hare cycle. Wildl Monogr No 58, 70 p
Klein DR (1977) Winter food preferences of snowshoe hares (Lepus americanus) in interior Alaska. 13th Int Congr Game Biologists, pp 266–275
Kozlowski TT (1971) Growth and Development of Trees. Vol 1. New York: Academic
Krefting LW, Stenlund MH, Seemel RK (1966) Effect of simulated and natural deer browsing on mountain maple. J Wildl Manage 30:481–488
Lack D (1954) Cyclic mortality. J Wild Manage 18:25–35
Leopold A (1943) Deer irruptions. Trans Wisc Acad Sci, Arts & Letters 35:351–366
MacLulich DA (1957) The place of chance in population processes. J Wildl Manage 21:293–299
May RM (1973) Time-delay versus stability in population models with two and three trophic levels. Ecology 54:315–325
May RM (1974) Stability and Complexity in Model Ecosystems. Princeton NJ: Princeton UP
May RM (1975) Biological populations with non-overlapping generations: stable points, stable cycles, and chaos. Science 186:645–647
May RM (1976) Simple mathematical models with very complicated dynamics. Nature 261:459–467
May RM, Oster GF (1976) Bifurctions and complexity in simple ecological models. American Naturalist 110:573–599
Maynard Smith J (1968) Mathematical Ideas in Biology. Cambridge: Cambridge UP
May RM, Conway GR, Hassell MP, Southwood TRE (1974) Time delays, density-dependence and single-species oscillations. J Anim Ecol 43:747–770
McConnell BR, Smith JG (1977) Influence of grazing on age-yield interactions in bitterbrush. J Wildl Manage 30:91–93
McKey D (1979) The distribution of secondary compounds within plants. In: Rosenthal GA, Janzen DH (eds) Herbivores: their interaction with secondary plant metabolites. New York: Academic Press, pp 55–133
Noy-Meir I (1975) Stability of grazing systems: an application of predator-prey graphs. J Ecol 63:459–481
Page EB (1963) Ordered hypotheses for multiple treatments: a significance test for linear ranks. J Amer Stat Assoc 58:216–230
Pease JL, Vowles RH, Keith LB (1979) Interaction of snowshoe hares and woody vegetation. J Wildl Manage 43:43–60
Pehrsson Å (1981) Winter food consumption and digestibility in caged mountain hares. In: Myers K, MacInnes CD (eds) Proc. World Lagomoph Conf. (Guelph, Ontario, 1979). pp 732–742
Pehrsson Å (198) Digestibility and retention of components in caged mountain hares (Lepus timidus L.) during the winter. Holarct Ecol (in press)
Reichardt PB (1981) Papyriferic acid: a triterpenoid from Alaskan paper birch. J Org Chem 46:4576–4578
Rhoades DI (1979) Evolution of plant chemical defense against herbivores. In: Rosenthal GA, Janzen DH (eds) Herbivores: their interaction with secondary plant metabolites. New York: Academic Press, pp 3–54
Rosenzweig ML, MacArthur RH (1963) Graphical representation and stability conditions of predator-prey interactions. Am Nat 97:209–223
Seton ET (1953) Lives of Game Animals, vol IV, Part II, Rodents. Boston: Branford
US Dept Agric, Soil Conserv Serv (1983) Summary of snow survey measurements for Alaska 1951–1982, 209 p
Vandermeer JH (1973) Generalized models of two species interactions: a graphical analysis. Ecology 54:809–818
Viereck LA (1973) Wildfire in the taige of Alaska. Quat Res 3:465–495
Viereck LA, Little EL Jr (1972) Alaska trees and shrubs. US Dept Agric For Serv, Agric. Hardbook No 410, 265 p
Willard EE, McKell CM (1973) Simulated grazing management systems in relation to shrub growth responses. J Range Manage 26:171–174
Wolff JO (1980) The role of habitat patchiness in the population dynamics of snowshoe hares. Ecol Monogr 50:111–130
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Fox, J.F., Bryant, J.P. Instability of the snowshoe hare and woody plant interaction. Oecologia 63, 128–135 (1984). https://doi.org/10.1007/BF00379794
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DOI: https://doi.org/10.1007/BF00379794