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Wildlife conservation and animal welfare: two sides of the same coin?

Published online by Cambridge University Press:  01 January 2023

PC Paquet*
Box 150, Meacham, SK S0K 2V0, Canada Faculty of Environmental Design, University of Calgary, Calgary, Alberta T2N 1N4, Canada Raincoast Conservation Foundation, PO Box 77, Denny Island, British Columbia V0T 1B0, Canada
CT Darimont
Raincoast Conservation Foundation, PO Box 77, Denny Island, British Columbia V0T 1B0, Canada Environmental Studies Department, 405 ISB, 1156 High Street, University of California, Santa Cruz, California 95064, USA
* Contact for correspondence and requests for reprints:


Human activities deprive wild animals of their life requisites by destroying or impoverishing their surroundings, causing suffering of individuals. Yet, the notion that animal welfare applies to wildlife has escaped many animal welfarists and conservationists. A well-accepted and applied ethical foundation for animal conservation that considers animal welfare is lacking. We address this by examining how worldviews of conservationists and animal welfarists are related. The clear conceptual link is that individuals within anthropogenically disturbed populations often endure suffering caused by humans. Accordingly, our objectives are to provide an overview of wildlife conservation, integrate ethical aspects of wildlife conservation and animal welfare, and encourage a ‘wildlife welfare’ ethic among conservationists. We describe the relationship between contemporary socioeconomic and environmental conditions and the impoverished status of North American wildlife. We then describe the ecological plight of large mammalian carnivores in North America. Finally, as a case study, we focus on the tenuous lives of grey wolves (Canis lupus) living in the midst of human-dominated landscapes. We conclude that the suffering wildlife endures because of humans is a collective responsibility that presents a moral imperative for animal welfarists and conservationists alike. Habitat destruction and impoverishment deprives species of life requisites, causing trauma, prolonged suffering, and eventually death. We suggest that a shared doctrine of animal welfare principles is needed, such as a modified version of the internationally recognised Five Freedoms. In essence, this would be an ethical affirmation for conservationists and animal welfarists.

Research Article
© 2010 Universities Federation for Animal Welfare

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Balmford, AR, Green, E and Jenkins, M 2003 Measuring the changing state of nature. Trends in Ecology & Evolution 18: 326330CrossRefGoogle Scholar
Bandura, A 2007 Impeding ecological sustainability through selective moral disengagement. International Journal of Innovation and Sustainable Development 2: 835CrossRefGoogle Scholar
Beier, P 1993 Determining minimum habitat areas and habitat corridors for cougars. Conservation Biology 7: 94108CrossRefGoogle Scholar
Bekoff, M 2002 Minding Animals: Awareness, Emotions, and Heart. Oxford University Press: New York, USAGoogle Scholar
Birch, TH 1993 Moral considerability and universal consideration. Environmental Ethics 15: 313332CrossRefGoogle Scholar
Boitani, L 1982 Wolf management in intensively used areas of Italy. In: Harrington, FH and Paquet, PC (eds) Wolves of the World pp 158172. Noyes Publisher: Park Ridge, NJ, USAGoogle Scholar
Bolnick, DI, Svanbäck, R, Fordyce, JA, Yang, LH, Davis, JM, Hulsey, CD and Forister, ML 2003 The ecology of individuals: incidence and implications of individual specialization. American Naturalist 161: 128CrossRefGoogle ScholarPubMed
Boyce, MS 1992 Population viability analysis. Annual Review of Ecology and Systematics 23: 481506CrossRefGoogle Scholar
Bradshaw, GA and Marino, L 2007 Minds of their own: the exciting new field of trans species psychology. Best Friends Magazine, November–December: 2426Google Scholar
Bradshaw, GA, Schore, AN, Brown, JL, Poole, JH and Moss, CJ 2005 Elephant breakdown: social trauma: early disruption of attachment can affect the physiology, behaviour and culture of animals and humans over generations. Nature 433: 807CrossRefGoogle Scholar
Brennan, A and Yeuk-Sze, L 2008 Environmental ethics. In: Zalta, EN (ed) The Stanford Encyclopedia of Philosophy Fall Edition. Scholar
Cardillo, M, Mace, GM, Gittleman, JL and Purvis, A 2006 Latent extinction risk and the future battlegrounds of mammal conservation. Proceeding of the National Academy of Sciences of the United States of America 103: 41574161CrossRefGoogle ScholarPubMed
Carmichael, LE 2005 An annotated historical account of canine parvovirus. Journal of Veterinary Medicine, Series B52: 303311CrossRefGoogle Scholar
Carroll, C, Noss, RF and Paquet, PC 2001 Carnivores as focal species for conservation planning in the Rocky Mountain Region. Ecological Applications 11: 961980CrossRefGoogle Scholar
Carroll, C, Noss, RF, Paquet, PC and Schumaker, NH 2004 Extinction debt of protected areas in developing landscapes. Conservation Biology 18: 11101120CrossRefGoogle Scholar
Ceballos, G and Ehrlich, PR 2002 Mammal population losses and the extinction crisis. Science 296: 904907CrossRefGoogle ScholarPubMed
Chandroo, KP, Duncan, IJH and Moccia, RD 2004a Can fish suffer? Perspectives on sentience, pain, fear and suffering. Applied Animal Behaviour Science 86: 225250CrossRefGoogle Scholar
Chandroo, KP, Yue, S and Moccia, RD 2004b An evaluation of current perspectives on consciousness and pain in fishes. Fish and Fisheries 5: 281295CrossRefGoogle Scholar
Chapman, RC 1977 The Effects of Human Disturbance on Wolves (Canis lupus). MS Thesis, University of Alaska, Fairbanks, USAGoogle Scholar
Clark, TW, Paquet, PC and Purlee, P 1996 Large carnivore conservation in the Rocky Mountains of the United States and Canada, Special Section. Conservation Biology 10: 9361055CrossRefGoogle Scholar
Corsi, F, Duprè, E and Boitani, L 1999 A large-scale model of wolf distribution in Italy for conservation planning. Conservation Biology 13: 150159CrossRefGoogle Scholar
Costanza, R 1991 Ecological Economics: The Science and Management of Sustainability. Columbia University Press: New York, USAGoogle Scholar
Covington, WW 2000 Helping western forests heal. Nature 408: 135136CrossRefGoogle ScholarPubMed
Crooks, KR and Soulé, ME 1999 Mesopredator release and avifaunal extinctions in a fragmented system. Nature 400: 563566CrossRefGoogle Scholar
Curatolo, JA and Murphy, SM 1986 The effects of pipelines, roads, and traffic on the movements of caribou, Rangifer tarandus. Canadian Field-Naturalist 100: 218224Google Scholar
Czech, B 2000 Economic growth as the limiting factor for wildlife conservation. Wildlife Society Bulletin 28: 415Google Scholar
Czech, B, Krausman, PR and Devers, PK 2000 Economic associations among causes of species endangerment in the United States. Bioscience 50: 593601CrossRefGoogle Scholar
Daly, HE 1993 Introduction to essays toward a steady-state economy. In: Daly, HE and Townsend, KN (eds) Valuing the Earth: Economics, Ecology, Ethics pp 1150. Massachusetts Institute of Technology Press: Cambridge, MA, USAGoogle Scholar
Daly, HE and Townsend, KN 1993 Valuing the Earth: Economics, Ecology, Ethics. Massachusetts Institute of Technology Press: Cambridge, MA,USAGoogle Scholar
Darimont, CT and Paquet, PC 2002 The gray wolves, Canis lupus, of British Columbia's central and north coast: distribution and conservation assessment. Canadian Field-Naturalist 116: 416422Google Scholar
Darimont, CT, Reimchen, TE, Bryan, HM and Paquet, PC 2008 Faecal-centric approaches to wildlife ecology and conservation; methods, data and ethics. Wildlife Biology in Practice 4: 7387CrossRefGoogle Scholar
Darimont, CT, Carlson, SM, Kinnison, MT, Paquet, PC, Reimchen, TE and Wilmers, CC 2009 Human predators outpace other agents of trait change. Proceedings of the National Academy of Sciences 106: 952954CrossRefGoogle ScholarPubMed
Devall, B and Sessions, G 1985 Deep Ecology: Living as if Nature Mattered. Peregrine Smith Books: Salt Lake City, Utah, USAGoogle Scholar
Diamond, J 1989 Overview of recent extinctions. In: Pearl, M and Western, D (eds) Conservation for the Twenty-First Century pp 3741. Oxford University Press: New York, USAGoogle Scholar
Diamond, JM 2005 Collapse: How Societies Choose to Fall or Succeed. Viking Press: New York, USAGoogle Scholar
Ehrenfeld, D 1991 Conservation and the rights of animals. Conservation Biology 5: 13Google Scholar
Ehrlich, PR 1995 The scale of human enterprise and biodiversity loss. In: Lawton, JH and May, RH (eds) Extinction Rates pp 214224. Oxford University Press: Oxford, UKGoogle Scholar
Ehrlich, PR and Hanski, I 2004 On the Wings of Checkerspots: A Model System for Population Biology. Oxford University of Press: New York, USAGoogle Scholar
Estes, JA 1998 Concerns about rehabilitation of oiled wildlife. Conservation Biology 12: 11561157CrossRefGoogle Scholar
Franklin, IR 1980 Evolutionary change in small populations. In: Soulé, ME and Wilcox, BA (eds) Conservation Biology: An Evolutionary-Ecological Perspective pp 135149. Sinauer Associates: Sunderland, MA, USAGoogle Scholar
Fraser, D 2008 Understanding Animal Welfare: The Science in its Cultural Context. Wiley-Blackwell: Oxford, UKGoogle Scholar
Fraser, D, Weary, DM, Pajor, EA and Milligan, BN 1997 A scientific conception of animal welfare that reflects ethical concerns. Animal Welfare 6: 187205Google Scholar
Fuller, TK 1989 Population dynamics of wolves in north-central Minnesota. Wildlife Monographs 105: 141Google Scholar
Fuller, TK, Berg, WE, Radde, GL, Lenarz, MS and Joselyn, GB 1992 A history and current estimate of wolf distribution and numbers in Minnesota. Wildlife Society Bulletin 20: 4255Google Scholar
Fuller, TK, Mech, LD and Cochrane, JF 2002 Wolf population dynamics. In: Mech, LD and Boitani, L (eds) Wolves: Behavior, Ecology, and Conservation. The University of Chicago Press: Chicago, USAGoogle Scholar
Gensler, HJ 1996 Formal Ethics. Routledge: London, UKCrossRefGoogle Scholar
Gilpin, ME and Hanski, I 1991 Metapopulation Dynamics: Empirical and Theoretical Investigations pp 1934. Academic Press: San Diego, USAGoogle Scholar
Gilpin, ME and Soulé, ME 1986 Minimum viable populations: processes of species extinction. In: Soulé, ME (ed) Conservation Biology: The Science of Scarcity and Diversity. Cambridge University Press: Cambridge, UKGoogle Scholar
Glenn, TC 1991 Animal rights/animal welfare. Conservation Biology 5: 436437Google Scholar
Goodall, J and Bekoff, M 2002 The Ten Trusts: What We Must Do to Care for the Animals We Love. Harper Collins: San Francisco, USAGoogle Scholar
Grey, W 1993 Anthropocentrism and deep ecology. Australasian Journal of Philosophy 71: 463475CrossRefGoogle Scholar
Groom, MJ, Meffe, GK and Carroll, CR 2005 Principles of Conservation Biology, Third Edition. Sinauer Associates: Sunderland, MA, USAGoogle Scholar
Guidelines for Wildlife Research 2008 A collection of existing guidelines presented at the meeting: Harmonisation of the Care and Use of Animals in Field Research. 21-22 May 2008, Gardermoen, Norway. Scholar
Haber, GC 1996 Biological, conservation and ethical implications of exploiting and controlling wolves. Conservation Biology 10: 10681081CrossRefGoogle Scholar
Hardin, G 1968 The tragedy of the commons. Science 162: 12431248CrossRefGoogle ScholarPubMed
Harmonisation of the Care and Use of Animals in Field Research 2008 A consensus document issued by the participants. Scholar
Hebblewhite, M, White, C, Nietvelt, C, McKenzie, J, Hurd, T, Fryxell, J, Bayley, S and Paquet, PC 2005 Human activity mediates a trophic cascade caused by wolves. Ecology 86: 13201330CrossRefGoogle Scholar
Heilbroner, RL 1992 The Worldly Philosophers: The Lives, Times and Ideas of the Great Economic Thinkers, Sixth Edition. Simon and Schuster: New York, USAGoogle Scholar
Heilhecker, E, Thiel, RP and Hall, W Jr 2007 Wolf, Canis lupus, behavior in areas of frequent human activity. Canadian Field Naturalist 121: 256260CrossRefGoogle Scholar
Hendry, AP, Farrugia, TJ and Kinnison, MT 2008 Human influences on the rate of phenotypic change in wild animal populations. Molecular Ecology 17: 2029CrossRefGoogle Scholar
Hummel, M and Pettigrew, S 1992 Wild Hunters: Predators in Peril. Key Porter Books: Toronto, CanadaGoogle Scholar
Hutchins, M 2007 The limits of compassion. The Wildlife Professional, Summer 1: 4244CrossRefGoogle Scholar
Jędrzejewska, B, Okarma, H, Jedrzejewski, W and Milkowski, L 1994 Effects of exploitation and protection on forest structure, ungulate density and wolf predation in Bialowieza Primeval Forest, Poland. Journal of Applied Ecology 31: 664676CrossRefGoogle Scholar
Jędrzejewski, W, Niedzialkowska, M, Nowak, S and Jędrzejewska, B 2004 Habitat variables associated with wolf (Canis lupus) distribution and abundance in northern Poland. Diversity and Distributions 10: 225233CrossRefGoogle Scholar
Jędrzejewski, W, Niedzialkowska, M, Myslajek, RW, Nowak, S and Jędrzejewska, B 2005 Habitat selection by wolves Canis lupus in the uplands and mountains of southern Poland. Acta Theriologica 50: 417428CrossRefGoogle Scholar
Jensen, WF, Fuller, TK and Robinson, WL 1986 Wolf, Canis lupus, distribution on the Ontario-Michigan border near Sault Ste Marie. Canadian Field-Naturalist 100: 363366Google Scholar
Jickling, R and Paquet, PC 2005 Wolf stories: reflections on science, ethics, and epistemology. Environmental Ethics 27: 115134CrossRefGoogle Scholar
Kellert, SR 1993 The biological basis for human values of nature. In: Kellert, SR and Wilson, EO (eds) The Biophilia Hypothesis pp 4269. Island Press: Washington, DC, USAGoogle Scholar
Kellert, SR 1996 The Value of Life: Biological Diversity and Human Society. Island Press: Washington, DC, USAGoogle Scholar
Lacy, RC 1993 VORTEX: a computer simulation model for population viability analysis. Wildlife Research 20: 4565CrossRefGoogle Scholar
Laliberte, AS and Ripple, WJ 2004 Range contractions of North American carnivores and ungulates. BioScience 54: 123158CrossRefGoogle Scholar
Leonard, JA, Vilà, C and Wayne, RK 2005 Legacy lost: genetic variability and population size of extirpated US gray wolves (Canis lupus). Molecular Ecology 14: 917CrossRefGoogle ScholarPubMed
Leopold, A 1949 A Sand County Almanac. Oxford University Press: New York, USAGoogle Scholar
Linklater, WL 2003 Science and management in a conservation crisis: a case study with rhinoceros. Conservation Biology 17: 968975CrossRefGoogle Scholar
Manning, RE 2003 Social climate change: a sociology of environmental philosophy. In: Minteer, BA and Manning, RE (eds) Reconstructing Conservation: Finding Common Ground pp 207222. Island Press: Washington, DC, USAGoogle Scholar
Mathews, F, Blumstein, DT, Darimont, CT, Chan, K, Dill, L, Fraser, D, Kirkwood, JK, Littin, K, Lusseau, D and Paquet, PC 2010 Uniting wild animal welfare and conservation: guiding principles. Animal Conservation, in pressGoogle Scholar
Mech, LD 1989 Wolf population survival in an area of high road density. American Midland Naturalist 121: 387389CrossRefGoogle Scholar
Mech, LD 1993 Updating our Thinking on the Role of Human Activity in Wolf Recovery (Research Information Bulletin 57). US Fish and Wildlife Service: St Paul, Minnesota, USAGoogle Scholar
Mech, LD 1995 The challenge and opportunity of recovering wolf populations. Conservation Biology 9: 270278CrossRefGoogle Scholar
Mech, LD and Goyal, SM 1993 Canine parvovirus effect on wolf population change and pup survival. Journal of Wildlife Diseases 29: 330333CrossRefGoogle ScholarPubMed
Mech, LD, Fritts, SH, Radde, GL and Paul, WJ 1988 Wolf distribution and road density in Minnesota. Wildlife Society Bulletin 16: 8587Google Scholar
Mech, LD, Fritts, SH and Wagner, D 1995 Minnesota wolf dispersal to Wisconsin and Michigan. American Midland Naturalist 133: 368370CrossRefGoogle Scholar
Meffe GK, Carroll CR and Contributors 1997 Principles of Conservation Biology. Sinauer Associates: Sunderland, MA, USAGoogle Scholar
Merrill, SB 2000 Road densities and wolf, Canis lupus, habitat suitability: An exception. Canadian Field-Naturalist 114: 312314Google Scholar
Millennium Ecosystem Assessment (MEA) 2005 Ecosystem and Human Well-being: Biodiversity Synthesis. World Resources Institute: Washington, DC, USAGoogle Scholar
Minteer, BA and Collins, JP 2005 Why we need an ‘ecological ethics’. Frontiers in Ecology and the Environment 3: 332337Google Scholar
Mladenoff, DJ, Haight, RG, Sickley, TA and Wydeven, AP 1997 Causes and implications of species restoration in altered ecosystems: A spatial landscape projection of wolf population recovery. Bioscience 47: 2131CrossRefGoogle Scholar
Mladenoff, DJ, Sickley, TA, Haight, RG and Wydeven, AP 1995 A regional landscape analysis and prediction of favorable gray wolf habitat in the northern Great Lakes region. Conservation Biology 9: 279294CrossRefGoogle Scholar
Mladenoff, DJ, Sickley, TA and Wydeven, AP 1999 Predicting gray wolf landscape recolonization: Logistic regression models vs new field data. Ecological Applications 9: 3744CrossRefGoogle Scholar
Morrison, JC, Sechrest, W, Dinerstein, E, Wilcove, DS and Lamoreux, JF 2007 Persistence of large mammal faunas as indicators of global human impacts. Journal of Mammalogy 88: 13631380CrossRefGoogle Scholar
Musiani, M and Paquet, PC 2004 Wolf persecution, protection, and restoration in Canada and the United States. Bioscience 54: 5060CrossRefGoogle Scholar
Naess, A 1973 The shallow and the deep, long-range ecology movement. Inquiry 16: 95100CrossRefGoogle Scholar
Naess, A 2002 Life's Philosophy: Reason and Feeling in a Deeper World. The University of Georgia Press: Athens, USAGoogle Scholar
Nelson, MP 1996 Holists and fascists and paper tigers … oh my. Ethics and the Environment 1: 103117Google Scholar
Newmark, WD 1987 A land-bridge island perspective on mammalian extinctions in western North American parks. Nature 325: 430432CrossRefGoogle ScholarPubMed
Newmark, WD 1995 Extinction of mammal populations in western North American national parks. Conservation Biology 9: 512526CrossRefGoogle Scholar
Nowak, RM, Walker, EP, MacDonald, DW and Kays, RW 2005 Walker's Carnivores of the World. John Hopkins University Press: Baltimore, MD, USAGoogle Scholar
Noss, RF 1987 Corridors in real landscapes: a reply to Simberloff and Cox. Conservation Biology 1: 159164CrossRefGoogle Scholar
Noss, RF, O’Connel, MA and Murphy, DD 1997 The Science of Conservation Planning: Habitat Conservation under the Endangered Species Act. Island Press: Washington, DC, USAGoogle Scholar
Paquet, PC and Carbyn, LN 2003 Wolf, Canis lupus and allies. In: Feldhamer, GA, Thompson, BC and Chapman, JA (eds) Wild Mammals of North America: Biology, Management, and Conservation pp 482510. Johns Hopkins University Press: Baltimore, MD, USAGoogle Scholar
Paquet, PC and Hackman, A 1995 A Large Carnivore Conservation Strategy for the Rocky Mountains. World Wildlife Fund (Canada) and World Wildlife Fund (USA): Toronto, CanadaGoogle Scholar
Paquet, PC, Wierzchowski, J and Callaghan, C 1996 Summary report on the effects of human activity on gray wolves in the Bow River Valley, Banff National Park, Alberta. In: Green, J, Pacas, C, Bayley, S and Cornwell, L (eds) A Cumulative Effects Assessment and Futures Outlook for the Banff Bow Valley, Chapter 7. Department of Canadian Heritage: Ottawa, CanadaGoogle Scholar
Parmesan, C 2006 Ecological and evolutionary responses to recent climate change. Annual Review of Ecology Evolution and Systematics 37: 637669CrossRefGoogle Scholar
Passmore, J 1974 Man's Responsibility for Nature, Second Edition. Gerald Duckworth & Co: London, UKGoogle Scholar
Pauly, D and Christensen, V 1995 Primary production required to sustain global fisheries. Nature 374: 255257CrossRefGoogle Scholar
Perry, D and Perry, G 2008 Improving interactions between animal rights groups and conservation biologists. Conservation Biology 22: 2735CrossRefGoogle ScholarPubMed
Pimlott, DH, Shannon, JA and Kolenosky, GB 1969 The Ecology of the Timber Wolf in Algonquin Provincial Park (Research Report, Wildlife No 87). Ontario Department of Lands and Forests: Toronto, CanadaGoogle Scholar
Postel, SL, Daily, GC and Ehrlich, PR 1996 Human appropriation of renewable freshwater. Science 271: 785788CrossRefGoogle Scholar
Rawles, KE 2004 Biological diversity and conservation policy. In: Oksanen, M and Pietarinen, J (eds) Philosophy and Biodiversity pp 199216. Cambridge University Press: Cambridge, UKCrossRefGoogle Scholar
Regan, T 1983 The Case for Animal Rights. University of California Press: Berkeley, USAGoogle Scholar
Rojstaczer, S, Sterling, SM and Moore, NJ 2001 Human appropriation of photosynthesis products. Science 294: 25492552CrossRefGoogle ScholarPubMed
Routley, R and Routley, V 1980 Human chauvinism and environmental ethics. In: Mannison, DS, McRobbie, MA and Routley, R (eds) Environmental Philosophy pp 96189. Australian National University Research School of Social Sciences: Canberra, AustraliaGoogle Scholar
Russell, WMS and Burch, RL 1959 The Principles of Humane Experimental Technique. Scholar
Sagoff, M 2004 Price, Principle, and the Environment. Cambridge University Press: New York, USACrossRefGoogle Scholar
Schonewald-Cox, CM and Buechner, M 1992 Park protection and public roads. In: Fiedler, PL and Jain, SK (eds) Conservation Biology: The Theory and Practice of Nature Conservation, Preservation and Management pp 373396. Chapman and Hall: New York, USACrossRefGoogle Scholar
Schweitzer, A 1946 Civilization and Ethics: the Philosophy of Civilization II, Third Edition. Adam and Charles Black: London, UKGoogle Scholar
Singer, P 1990 Animal Liberation, Second Edition. The New York Review of Books (Distributed by Random House): New York, USAGoogle Scholar
Smith, TB and Bernatchez, L 2008 Evolutionary change in human-altered environments. Molecular Ecology 17: 18CrossRefGoogle ScholarPubMed
Song, SJ and M’Gonigle, RM 2001 Science, power, and system dynamics: the political economy of conservation biology. Conservation Biology 15: 980989CrossRefGoogle Scholar
Soulé, ME 1985 What is conservation biology? BioScience 35: 727734Google Scholar
Soulé, ME 1987 Viable Populations for Conservation. Cambridge University Press: New York, USACrossRefGoogle Scholar
Stockwell, CA, Hendry, AP and Kinnison, MT 2003 Contemporary evolution meets conservation biology. Trends in Ecology & Evolution 18: 94101CrossRefGoogle Scholar
United Nations Environmental Programme 2007 Global Environment Outlook: Environment for Development Assessment Report. United Nations: Washington DC, USA. http://www.unep.orgGoogle Scholar
Taylor, P 1981 The ethics of respect for nature. Environmental Ethics 3: 197218CrossRefGoogle Scholar
Taylor, P 1986 Respect for Nature. Princeton University Press: Princeton, USAGoogle Scholar
Terborgh, J, Estes, JA, Paquet, PC, Ralls, K, Boyd-Heger, D, Miller, BJ and Noss, RF 1999 The role of top carnivores in regulating terrestrial ecosystems. In: Soulé, ME and Terborgh, J (eds) Continental Conservation pp 3964. Island Press: Washington, DC, USAGoogle Scholar
The Wildlife Society 2003 The Relationship of Economic Growth to Wildlife Conservation. (Wildlife Society Technical Review 03-1). The Wildlife Society: Bethesda, MD, USAGoogle Scholar
Thiel, RP 1985 Relationship between road densities and wolf habitat suitability in Wisconsin. American Midland Naturalist 113: 404407CrossRefGoogle Scholar
Thurber, JM, Peterson, RO, Drummer, TD and Thomasma, SA 1994 Gray wolf response to refuge boundaries and roads in Alaska. Wildlife Society Bulletin 22: 6167Google Scholar
Varner, GE 1998 In Nature's Interests? Interests, Animal Rights, and Environmental Ethics. Oxford University Press: Oxford, UKGoogle Scholar
Vitousek, PM, Ehrlich, PR, Ehrlich, AH and Matson, PA 1986 Human appropriation of the products of photosynthesis. BioScience 36: 368373CrossRefGoogle Scholar
Vitousek, PM, Mooney, HA, Lubchenco, J and Melillo, JM 1997 Human domination of earth's ecosystems. Science 277: 494499CrossRefGoogle Scholar
Vucetich, J and Nelson, MP 2007 What are 60 warblers worth? Killing in the name conservation? Oikos 116: 12671278CrossRefGoogle Scholar
Weaver JL, Paquet PC and LF Ruggiero 1996 Resilience and conservation of large carnivores in the Rocky Mountains. Conservation Biology 10: 10131025Google Scholar
Wilcove, DS, McLellan, CH and Dobson, AP 1986 Habitat fragmentation in the temperate zone. In: Soulé, ME (ed) Conservation Biology: The Science of Scarcity and Diversity pp 237256. Sinauer Associates: Sunderland, MA, USAGoogle Scholar
Wilcox, BA and Murphy, DD 1985 The effects of fragmentation on extinction. American Naturalist 125: 879887CrossRefGoogle Scholar
Wilson, EO 2006 The Creation: An Appeal to Save Life on Earth. Norton: New York, USAGoogle Scholar
Woodroffe, R and Ginsburg, JR 1998 Edge effects and the extinction of populations inside protected areas. Science 280: 21262128CrossRefGoogle ScholarPubMed