Metrics of predation: perils of predator-prey ratios

• Autorzy: Bowyer R. T. , Kie J. G. , Person D. K. , Monteith K. L.
• Języki publikacji: EN

Abstrakty

EN

We developed an original modeling approach using program Stella® to investigate the usefulness of predator–prey ratios (PPRs) for interpreting top-down and bottom-up forcing on moose Alces alces. We included density-dependent feedbacks for the moose population, allowed K to vary based on amount and quality of available forage for moose, integrated effects of compensatory mortality, and added time lags in wolves Canis lupus tracking the moose population. Modeling scenarios we developed included bottom-up and top-down regulation as predetermined outcomes. We then evaluated whether PPRs would reflect the various combinations of trajectories of predator and prey populations under top-down versus bottom-up regulation. The resulting patterns of PPRs were impossible to disentangle from one another, and did not provide reliable insights into whether top-down or bottom-forcing occurred, especially over short time spans where critical decisions related to management of moose and wolves might be necessary. Only under top-down regulation did PPRs reflect the degree of predation experienced by moose, but in that instance, knowledge of top-down regulation must be known a priori to correctly interpret PPRs. Potential problems with interpreting PPRs include their double-variable nature, which resulted in the failure to reflect patterns of increase and decrease for predators and prey. We suggest that confidence intervals for PPRs be calculated from a binomial, similar to that proposed for sex and age ratios, which should help discourage the inappropriate use of this metric. We caution that the temptation to use PPRs often is irresistible, but their reliability is highly questionable. We provide an alternative method to using PPRs or other predation metrics for determining whether top-down or bottom-up forcing is occurring by adopting an approach based on the physical condition and life-history characteristics of prey.

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2013
• Tom: 58
• Numer: 4
• Opis fizyczny: p.329-340,fig.,ref.

Twórcy

autor

Bowyer R. T.

• Department of Biological Sciences, Idaho State University, 921 South 8th Avenue, Stop 8007, Pocatello, ID 83209, USA

autor

Kie J. G.

• Department of Biological Sciences, Idaho State University, 921 South 8th Avenue, Stop 8007, Pocatello, ID 83209, USA

autor

Person D. K.

• Division of Wildlife Conservation, Alaska Department of Fish and Game, 2030 Sea Level Drive, Ketchikan, AK 99901, USA

autor

Monteith K. L.

• Department of Biological Sciences, Idaho State University, 921 South 8th Avenue, Stop 8007, Pocatello, ID 83209, USA
• Cooperative Fish and Wildlife Research Unit, University of Wyoming, Box 3166, 1000 East University Avenue, Laramie, WY 82071, USA

Bibliografia

• Abrams PA, Ginzburg LR (2000) The nature of predation: prey dependent, ratio dependent or neither. Trends Ecol Evol 15:337–341
• Bangs EE, Fritts SH, Fontaine JA, Smith DW, Murphy KM, Mack CM, Niemeyer CC (1998) Status of gray wolf restoration in Montana, Idaho, and Wyoming. Wildl Soc Bull 26:785–798
• Barboza PS, Parker KL, Hume ID (2009) Integrative wildlife nutrition. Springer-Verlag, Berlin
• Barnowe-Meyer KK, White PJ, Davis TL, Smith DW, Crabtree RL, Byers JA (2010) Influences of wolves and high-elevation dispersion on reproductive success of pronghorn (Antilocapra americana). J Mammal 91:712–721
• Bartmann RM, White GC, Carpenter LH (1992) Compensatory mortality in a Colorado mule deer population. Wildl Monogr 121:1–39
• Beier P (1991) Cougar attacks on humans in the United States. Wildl Soc Bull 19:403–412
• Berryman AA (2004) Limiting factors and population regulation. Oikos 105:667–670
• Boertje RD, Keech MA, Young RD, Kellie KA, Seaton CT (2009) Managing for elevated yield of moose in interior Alaska. J Wildl Manag 73:314–327
• Boutin S (1992) Predation and moose population dynamics. J Wildl Manag 56:116–127
• Bowden DC, Anderson AW, Medin DE (1984) Sampling plans for mule deer sex and age ratios. J Wildl Manag 48:500–509
• Bowyer RT (1991) Timing of parturition and lactation in southern mule deer. J Mammal 72:418–412
• Bowyer RT, Kie JG (2006) Effects of scale on interpreting life-history characteristics of ungulates and carnivores. Diver Dist 12:244–257
• Bowyer RT, Blundell GM, Ben-David M, Jewett SC, Thomas AD, Duffy LK (2003) Effects of the Exxon Valdez oil spill on river otters: injury and recovery of a sentinel species. Wildl Monogr 153:1–53
• Bowyer RT, Nicholson MC, Molvar EM, Faro JB (1999) Moose on Kalgin Island: are density-dependent process related to harvest? Alces 35:73–89
• Bowyer RT, Person DK, Pierce BM (2005) Detecting top-down versus bottom-up regulation of ungulates by large carnivores: implications for conservation of biodiversity. In: Ray JC, Redford KH, Steneck RS, Berger J (eds) Large carnivores and the conservation of biodiversity. Island Press, Covelo, pp 342–361
• Bowyer RT, Van Ballenberghe V, Kie JG (1998) Timing and synchrony of parturition in Alaskan moose: long-term versus proximal effects of climate. J Mammal 79:1332–1344
• Boyce MS (1989) The Jackson elk herd: intensive wildlife management in North America. Cambridge Univ Press, Cambridge
• Boyce MS (2000) Modeling predator–prey dynamics. In: Boitani L, Fuller T (eds) Research techniques in animal ecology. Columbia Univ Press, New York, pp 253–287
• Bull J, Nilsen EB, Mysterud A, Milner-Bulland EJ (2009) Survival on the border: a population model to evaluate management options for Norway’s wolves Canis lupus. Wildl Biol 15:412–424
• Butler LG, Kielland K (2008) Acceleration of vegetation turnover and element cycling by mammalian herbivory in riparian ecosystems. J Ecol 96:136–144
• Caughley G, Krebs CJ (1983) Are big mammals simply little mammals writ large? Oecologia 59:7–17
• Creel SD, Christianson D, Libby S, Winnie JA Jr (2007) Predation risk affects reproductive physiology and demography of elk. Science 315:960
• Creel S, Winnie JA Jr, Christianson D (2009) Glucocorticoid stress hormones and the effect of predation risk on elk reproduction. Proc Natl Acad Sci USA 106:12388–12393
• Croitor R, Brugal JP (2010) Ecological and evolutionary dynamics of the carnivore community in Europe during the last 3 million years. Quat Int 212:98–108
• Dale BW, Adams LG, Bowyer RT (1994) Functional response of wolves preying on barren-ground caribou in a multiple-prey ecosystem. J Anim Ecol 63:644–652
• Donald DB, Anderson RS (2003) Resistance of the prey-to-predator ratio to environmental gradients and to biomanipulations. Ecology 84:2387–2394
• Eberhardt LL (1997) Is wolf predation ratio-dependent? Can J Zool 75:1940–1944
• Ford A (2009) Modeling the environment, 2nd edn. Island Press, Washington D.C
• Fuller TK (1989) Population dynamics of wolves in north-central Minnesota. Wildl Monogr 105:1–41
• Fuller TK, Mech LD, Cochrane JF (2003) Wolf population dynamics. In: Mech LD, Boitani L (eds) Wolves: Behavior, ecology, and conservation. Univ Chicago Press, Chicago, pp 161–191
• Gaillard J-M, Festa-Bianchet M, Yoccoz G, Loison A, Toigo C (2000) Temporal variation in fitness components of population dynamics of large herbivores. Ann Rev Ecol Evol Syst 31:367–393
• Gamito S, Chainho P, Costa JL, Medeiros JP, Costa MJ, Marques JC (2010) Modelling the effects of extreme events on the dynamics of the amphipod Corophium orientale. Ecol Model 221:459–466
• Garrott RA, Bruggeman JE, Becker MS, Kaunowski ST, White PJ (2007) Evaluating prey switching in wolf–ungulate systems. Ecol Appl 17:1588–1597
• Gasaway WC, Boertje RD, Grandaard DV, Kelleyhouse DG, Stephenson RO, Larsen DG (1992) The role of predation in limiting moose at low densities in Alaska and Yukon and implications for conservation. Wildl Monogr 120:1–59
• Grøtan V, Sæther B-E, Lillegård M, Solberg EJ, Engen S (2009) Geographical variation in the influence of density dependence and climate of the recruitment of Norwegian moose. Oecologia 161:685–695
• Hayes RD, Farnell R, Ward RMP, Carey J, Dehn M, Kuzyk GW, Baer AM, Gardner CL, O’Donoghue M (2003) Experimental reduction of wolves in the Yukon: ungulate responses and management implications. Wildl Monogr 152:1–35
• Jędrzejwska B, Jędrzejewski W (1998) Predation in vertebrate communities: the Białowieża Primeval Forest as a case study. Spring-Verlag Ecol Stud 135
• Jędrzejwska B, Jędrzejewski W (2005) Large carnivores and ungulates in European temperate forest ecosystems: bottom-up and top-down control. In: Ray JC, Redford KH, Steneck RS, Berger J (eds) Large carnivores and the conservation of biodiversity. Island Press, Covelo, pp 230–246
• Jędrzejwska B, Jędrzejewski W, Bunevich AN, Wilkowski L (1997) Factors shaping population densities and increase rates of ungulates in Białowieża Primeval Forest (Poland and Belarus) in the 19th and 20th centuries. Acta Theriol 42:399–451
• Jędrzejewski W, Schmidt K, Theuerkauf J, Jedzejewska B, Selva N, Zub SL (2002) Kill rates and predation by wolves on ungulate populations in Białowieża Primeval Forest (Poland). Ecology 83:1341–1356
• Keith LB (1983) Population dynamics of wolves. In: Carbyn LN (ed) Wolves in Canada and Alaska: their status, biology, and management. Can Wildl Serv Rep Ser 45, Ottawa, pp 66–77
• Kie JG, Bowyer RT, Stewart KM (2003) Ungulates in western forests: habitat requirements, population dynamics, and ecosystem processes. In: Zable C, Anthony R (eds) Mammal community dynamics in western coniferous forests: management and conservation. Johns Hopkins Univ Press, Baltimore, pp 269–340
• Kokko H (2007) Modelling for field biologists and other interesting people. Cambridge Univ Press, Cambridge
• Liberg O, Chapron G, Wabakken P, Pedersen HC, Hobbs NT, Sand H (2012) Shoot, shovel and shut up: cryptic poaching slows restoration of a large carnivore in Europe. Proc R Soc B Biol Sci 297:910–915
• Marshal JP, Boutin S (1999) Power analysis of wolf–moose functional responses. J Wildl Manag 63:396–402
• May RM (1973) Stability and complexity in model ecosystems. Princeton Univ Press, Princeton
• McCarthy KP, Fuller TK, Ming M, McCarthy TM, Waits L, Jumabeaev K (2008) Assessing estimators of snow leopard abundance. J Wildl Manag 72:1826–1833
• McCullough DR (1979) The George Reserve deer herd: population ecology of a K-selected species. Univ Michigan Press, Ann Arbor
• Melis C, Jadrzejewska B, Apollonio M, Barton KA, Jedrzejewski W, Linnell JDC, Kojola I, Kusak J, Adamic M, Ciuti S, Delehan I, Dykyy I, Krapine K, Mattoli L, Sagaydak A, Samchuk N, Schmidt K, Shkvyrya M, Sidorovich VE, Zawadzka B, Zhyla S (2009) Predation has a greater impact in less productive environments: variation in roe deer, Capreolus capreolus, population density across Europe. Glob Ecol Biogeogr 18:724–734
• Messier F (1994) Ungulate population models with predation: a case study with the North American moose. Ecology 75:478–488
• Milanesi P, Meriggi A, Merli E (2012) Selection of wild ungulates by wolves Canis lupus (L. 1758) in an area of Northern Apennies (North Italy). Ethol Ecol Evol 24:81–96
• Miller SD, Schoen JW, Faro J, Klein DR (2011) Trends in intensive management of Alaska’s grizzly bears, 1980–2010. J Wildl Manag 75:1243–1252
• Monteith KL, Schmitz LE, Jenks JA, Delger JA, Bowyer RT (2009) Growth of male white-tailed deer: consequences of maternal effects. J Mammal 90:651–660
• Monteith KL, Stephenson TR, Bleich VC, Connor MM, Bowyer RT (2013) Risk-sensitive allocation in seasonal dynamics of fat and protein reserves in a long-lived mammal J Anim Ecol 82: in press
• Oakleaf JK, Murray DL, Oakleaf JR, Bangs EE, Mack CM, Smith DW, Fontaine JA, Jimenez MD, Meier TJ, Niemeyer CC (2006) Habitat selection by recolonizing wolves in the Northern Rocky Mountains of the United States. J Wildl Manag 70:554–563
• Parker KL, Barboza PS, Gillingham MP (2009) Nutrition integrates environmental responses of ungulates. Funct Ecol 23:57–69
• Person DK, Bowyer RT, Van Ballenberghe V (2001) Density dependence of ungulates and functional responses of wolves: effects on predator–prey ratios. Alces 37:253–273
• Peterson RO, Page RE (1983) Wolf–moose fluctuations at Isle Royale National Park, Michigan, U.S.A. Acta Zool Fenn 174:251–253
• Pierce BM, Bleich VC, Monteith KL, Bowyer RT (2012) Top-down versus bottom-up forcing: evidence from mountain lions and mule deer. J Mammal 93:977–988
• Raia P, Meloro C, Barbera C (2007) Inconsistency in predator/prey ratios in Quaternary large mammal communities of Italy, with an appraisal of mechanisms. Quat Res 67:255–263
• Regelin WL, Hubbert ME, Schwartz CC, Reid DJ (1987) Field test of a moose carrying capacity model. Alces 23:243–284
• Rempel RS (2011) Effects of climate change on moose populations: exploring the response horizon through biometric and system models. Ecol Model 222:3533–3365
• Renecker LA, Hudson RJ (1985) A technique for estimating dry matter intake of tame free-ranging moose. Alces 21:267–277
• Rominger EM, Whitlaw HA, Weybright DL, Dunn WC, Ballard WB (2004) The influence of mountain lion predation on bighorn sheep translocations. J Wildl Manag 68:993–999
• Sand H, Vucetich JA, Zimmermann B, Wabakken P, Wikenros C, Pedersen HC, Peterson RO, Liberg O (2012) Assessing the influence of prey–predator ratio, prey age structure and packs size on wolf kill rates. Oikos 121:1454–1463
• Schwartz CC, Haroldson MA, White GC (2010) Hazards affecting grizzly bear survival in the Greater Yellowstone Ecosystem. J Wildl Manag 74:654–667
• Schwartz CC, Regelin WL, Franzmann AW (1984) Seasonal dynamics of food intake in moose. Alces 20:223–244
• Skogland T (1985) The effects of density-dependent resource limitation on the demography of wild reindeer. J Anim Ecol 54:359–374
• Smith DW, Bangs EE, Oakleaf JK, Mack C, Fontaine J, Boyd D, Jimeniz M, Pletscher DH, Niemeyer CC, Meier TJ, Stahler DR, Hoyan J, Asher VJ, Murray DL (2010) Survival of colonizing wolves in the Northern Rocky Mountains of the United States. J Wildl Manag 74:620–634
• Starfield AM, Bleloch AL (1986) Building models for conservation and wildlife management. Macmillan Publ Co, New York
• Stewart KM, Bowyer RT, Dick BL, Johnson BK, Kie JG (2005) Density-dependent effects on physical condition and reproduction in North American elk: an experimental test. Oecologia 143:85–93
• Theberge JB (1990) Potentials for misinterpreting impacts of wolf predation through prey: predator ratios. Wildl Soc Bull 18:188–192
• Van Ballenberghe V (2006) Predator control, politics, and wildlife conservation in Alaska. Alces 42:1–11
• Van Ballenberghe V, Ballard WB (1994) Limitation and regulation of moose populations: the role of predation. Can J Zool 72:2071–2077
• Vucetich JA, Hebblewhite M, Smith DW, Peterson RO (2011) Predicting prey population dynamics from kill rate, predation rate, and predator-prey ratios in three wolf–ungulate systems. J Anim Ecol 80:1236–1245
• Vucetich JA, Peterson RO, Schafer CL (2002) The effect of prey and predator densities on wolf predation. Ecology 83:3003–3013
• Walters S (2001) Landscape pattern and productivity effects on source-sink dynamics of deer populations. Ecol Model 143:17–32
• Weclaw P, Hudson RJ (2004) Simulation of conservation and management of woodland caribou. Ecol Model 177:75–94
• White TCR (2007) Resolving the limitation–regulation debate. Ecol Res 22:354–357
• Wright GJ, Peterson RO, Smith DW, Lemke TO (2006) Selection of northern Yellowstone elk by gray wolves and hunters. J Wildl Manag 70:1070–1078
• Wu JG, Vankat JL, Barlas Y (1993) Effects of patch connectivity and arrangement on animal metapopualtion dynamics: a simulation study. Ecol Model 65:221–254