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Application of the Metapopulation Theory to Conservation:
The SeaWorld Controversy: Not so Black and White

Human-Wildlife Conflict: Polar Bears (Ursus maritimus) and Indigenous Communities

By Alice Hales

Abstract

Due to human activity, the temperature of the atmosphere is on the rise and global climate change is taking its toll (7). Polar bears (Ursus maritimus) are an arctic species reliant on steadily declining sea ice (7). The range shifts in polar bears due to food scarcity has pushed them to encroach on urban areas. Due to the dangerous nature of the bears to humans and properties, human-wildlife conflict arises (19). The endangered status of the bears means that both the safety of indigenous communities and the bears conservation are both top priorities (17). Several short-term solutions, such as waste management, proper food storage and education on bear encounters can help to reduce attacks (5). Though co-management between indigenous Inuit communities and conservation biologists is the only way to greatly reduce conflict in the long-term (6). Places such as Nunavut in Canada, have already lead the way with policy changes and local involvement to maintain the dignity of the people and effective management of the animals (8).

Introduction

Defined by the World Wildlife Fund (WWE), human-wildlife conflict is the interaction between humans and animals that negatively impacts the people, animal, resources or habitat involved (19). The frequency and severity of conflict between humanity and animals will likely increase exponentially as climate change progresses (7). The human population is growing larger, and the changing climate is forcing species to migrate away from unfavourable conditions (7).

Polar bear populations (Ursus maritimus) are in the direct firing line of climate change. The temperature increase of the Arctic is causing a 14% decrease in the sea ice habitat annually of the endangered bears (2). Habitat loss has driven the steady decline of bear populations, and those that survive suffer loss of condition, malnourishment, stunted growth and reduced reproduction (2, 13). The additional cost of forced range shifts in polar bears is encroachment on urban areas (17). Local indigenous communities in the Canadian territory claim a dramatic increase in the number of human-bear interactions (17). Polar bears are dangerous predators and pose a great threat to the communities they are now invading (15). Property damage and trash spreading can be extensive, causing financial losses and cleanup after a bear interaction (16). WWF is working with the effected communities to improve food and waste management, conduct community patrols, improve awareness, use of technology and conduct research to combat this conflict issue (18). These solutions are needed, and already proving to be effective; ensuring it does not become a trade-off between human safety and polar bear conservation (15).

Urban Encroachment of Polar Bears

Polar bear prey, comprised largely of seal species, rely on algae that grows on sea ice (15). The reduction of ice induces food shortages for polar bears, forcing them to find alternative nourishment and migrate northward (15). Large portions of polar bear habitat are predicted to become seasonally ice-free in the coming years, including the southern Beaufort Sea (11). Trash-picking, scavenging and defensive behaviour towards humans is becoming a learned behaviour; transmitted from mother to offspring (15).

Bears have been known to attack, injure or kill humans when interactions occur, potentially even seeing us as prey (3). They can cause extensive property damage of up to thousands, inducing financial hardships in targeted areas (3, 16).  Replacing food preservation and transport equipment, or hiring bear monitors are all expensive realities (10). Tourism in arctic areas is becoming more popular, having a positive influence on the economy but increasing risk of interaction (16). Despite the threat they pose, polar bears are endangered and a high priority in conservation (9). Due to conflict with humans, 618 bears were killed in self defence in areas of Canada between 1970 and 2000 (9).

Polar bears have been protected under the ‘International Agreement on the Conservation of Polar Bears and Their Habitat’ since 1973 (6). Though there is debate that the protection of the bears has not kept up with their rapidly changing situation (6). Inuit communities, such as those in Nunavut and Manitoba, are in close proximity to the bears (6, 16). The photo below (Figure 1) shows a bear searching for food in a dumping area in the small town of Arviat in Nunavut (1).

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Figure 1. Polar bear searching for food in rubbish heap. Nunavut, Canada. (1)

Management of the Issue

Attracted by the smell of meat, polar bears will seek poorly kept meat or abandoned carcasses (18). Bear-proofing bins (shown in Figure 2) can reduce triggering the animals. Since the installation of these steel disposal structures (Figure 2), the community of Arivat had a decrease in sightings and approximately seven less bears are killed every year (18). Thermal/infrared fencing around dumps is a new cost effective way of monitoring behaviour (18). This technology will send a text message to the person patrolling the area, alerting them of a bear’s presence (18).

wwf-us_-_elisabeth_kruger_medium_ww145150

Figure 2. Steel food storage bins to deter bears from enticing waste. This has seen a decrease in bear sightings and shootings since installation.  Arviat in Nunavut, Canada (18).

A limitation to many mitigation options is cost. WWF has funded training and steady income for those who work to deter bears and ensure safe communities (18). Bear patrol and work safety workshops combine knowledge from many different places, including Russia, to share the best ways of reducing danger (18). Providing education to those who work in compromising jobs (such as mining or tourism) has increased confidence and reduced fatal accidents when encountering these animals (18).

Long term solutions to human-wildlife conflict in this sense will come from sufficient indigenous involvement and co-management (6, 8). Policies, on the protection of bears and communities alike, will combine traditional values and customs with realistic conservation goals. Change from the top-down takes time and evidence of a problem; yet the solutions above will mitigate the negative impact of the bears while more permanent adaptive capacity is improved.

Local Community Involvement

When conserving a species, it is essential to understand the values and traditions of locals. Without policies that protect the human populations as well, harmful interactions may be elevated and illegal action may be taken (8). The local communities and organisations in Nunavut are acting to resolve human-wildlife conflict together (8). The hunting of polar bears is sacred for Inuit tribes to welcome their children into adulthood; and the number of polar bears in the area was raising safety concerns in the wider community (8). Traditional knowledge and practices should be valued in this situation.

The Government of Nunavut saw the potential for escalated conflict if this rite of passage was taken away from the tribes. Inuit communities hold the bears in high respect and support wildlife management. Co-management of the bears between government, wildlife trusts and Inuit communities is now being put in place (8). The ‘Inuvialuit Land Claim’ has overcome the limitations of conflict allowing indigenous people rights to the land (14). Special permission for traditional hunting on a limited number of the population was retained, biologists work to protect mothers and cubs while few males can be legally harvested (14). Excluding local knowledge and practices in an area, or with a species, escalates conflict and causes tension. Policies combining modern science and indigenous views encourages problem solving and effective management (8). his collaborative approach has helped to mitigate the ill effects of polar bear interactions while allowing traditional customs to continue. A positive outcome for both conservation and the wider community.

Conclusion

Due to a continuous rise in global warming, sea ice has been rapidly disappearing from the arctic (2). Polar bears are predators and threaten the lives and property of humans, inducing human-wildlife conflict. To protect their families and assets, locals are sometimes forced to act against the bears.

Although the bears are under protection, indigenous communities fall victim of lack of policy change to accommodate their values and safety (8). Communities and government in Nunavut, Canada have worked to create a solution. Co-management of indigenous knowledge and practices combined with modern science and biology reduces conflict (8). By acknowledging that Inuit communities have rights to the land and traditional methods, different groups can work together on goals to conserve the bears (6). Education in the workforce and on behaviour, food storage, community patrols, waste management and technology are effective strategies to reduce their chance of negative encounters (12). These mitigation strategies have proven to reduce the number of attacks, accidents, bear sightings and lethal defence (18). Eradicating all conflict between humans and polar bears is unrealistic, though strategies and governing to greatly reduce negative effects are hopeful in the foreseeable future.

 References

  1. BBC News & Rollin, L. (2015). The polar bears are coming to town. Retrieved from: https://www.bbc.com/news/magazine-34490185
  2. Bromaghin, J. F., McDonald, T. L., Stirling, I. , Derocher, A. E., Richardson, E. S., Regehr, E. V., Douglas, D. C., Durner, G. M., Atwood, T. & Amstrup, S. C. (2015), Polar bear population dynamics in the southern Beaufort Sea during a period of sea ice decline. Ecological Applications, 25, 634-65.
  3. Can, Ö. E., D’Cruze, N., Garshelis, D. L., Beecham, J. & Macdonald, D. W. (2014). Resolving Human‐Bear Conflict: A Global Survey of Countries, Experts, and Key Factors. Conservation Letters, 7, 501-513.
  4. Clark, D. A., Van Beest, F. & Brook, R. (2013). Polar Bear-human conflicts: state of knowledge and research needs. Canadian Wildlife Biology and Management, 1, 21-29.
  5. Clark, D., Clark, S., Dowsley, M., Foote, L., Jung, T., & Lemelin, R. (2010). It’s Not Just about Bears: A Problem-Solving Workshop on Aboriginal Peoples, Polar Bears, and Human Dignity.Arctic, 63(1), 124-127.
  6. Clark, D., Lee, D., Freeman, M., & Clark, S. (2008). Polar Bear Conservation in Canada: Defining the Policy Problems.Arctic,61(4), 347-360.
  7. Collaborative Partnership on Sustainable Wildlife Management (CPW). (2015). Sustainable wildlife management and human-wildlife conflict. Retrieved from: http://www.fao.org/3/a-i4893e.pdf
  8. Dowsley, M., & Wenzel, G. (2008). “The Time of the Most Polar Bears”: A Co-Management Conflict in Nunavut.Arctic, 61(2), 177-189.
  9. Dyck, M.G. (2006). Characteristics of polar bears killed in defense of life and property in Nunavut, Canada, 1970–2000. Ursus,17(1), 52-62.
  10. IUCN/Polar Bear Specialist Group. (2001). IUCN/Polar Bear Specialist Group 13th meeting. Retrieved from: http://pbsg.npolar.no/en/meetings/stories/13th_meeting.html
  11. Lillie, K. M., Gese, E. M., Atwood, T. C., & Sonsthagen, S. A. (2018). Development of on-shore behavior among polar bears (Ursus maritimus) in the southern Beaufort Sea: inherited or learned?.Ecology and evolution8(16), 7790–7799.
  12. Polar Bears International (PBI). (2017). News Release: Polar Bear Attacks, Causes, and Prevention. Retrieved from: https://polarbearsinternational.org/news/article-research/news-release-polar-bear-attacks-causes-and-prevention/
  13. 4 Rode, K. D., Amstrup, S. C. & Regehr, E. V. (2010), Reduced body size and cub recruitment in polar bears associated with sea ice decline. Ecological Applications, 20, 768-782.
  14. Sillero-Zubiri, C., & K. Laurenson. (2001). Interactions between carnivores and local communities: Conflict or co-existence?. Proceedings of a Carnivore Conservation Symposia, 282-312.
  15. Thiemann, G. W., Iverson, S. J. & Stirling, I. (2008). Polar Bear Diets and Arctic Marine Food Webs: Insights from Fatty Acid Analysis. Ecological Monographs, 78, 591-613.
  16. Towns, L., Derocher, A.E., Stirling, I., Lunn, N.J. & Hedman, D. (2009). Spatial and temporal patterns of problem polar bears in Churchill, Manitoba. Polar Biol., 32, 1529‐
  17. Wilder, J. M., Vongraven, D., Atwood, T. , Hansen, B. , Jessen, A. , Kochnev, A. , York, G. , Vallender, R. , Hedman, D. & Gibbons, M. (2017), Polar bear attacks on humans: Implications of a changing climate. Soc. Bull., 41, 537-547.
  18. World Wildlife Fund (WWF). (2015). Conflict. Retrieved from: https://arcticwwf.org/species/polar-bear/conflict/
  19. World Wildlife Fund (WWF). (2019) Human-Wildlife Conflict. Retrieved from: https://wwf.panda.org/our_work/wildlife/problems/human_animal_conflict/

Shall we reconcile?

Abhijeetkumar

Abstract

Applied ecology draws concepts and ideas from the science of ecology for policy setting, decision making, and practice to solve contemporary problems in managing our natural resources [1].

Restoration, Reservation and Reconciliation form three important pillars of applied ecology.

With an anthropocene extinction close at our heels, conservationists are faced with many dilemmas to save species and ecosystems.

In the words of  Baba Dioum “In the end we will conserve only what we love, we will love only what we understand, and we will understand only what we are taught.”

With more areas being occupied by urban spaces than ever before, and most humans living in urban settings, it is essential to integrate nature with people and fulfill their biophilic needs.

In this paper, we describe all the three R’s of ecology (Restoration, Reservation and Reconciliation) and provide case studies of how reconciliation ecology is proving to be a biodiversity boon.

Introduction

Humans are completely dependent on nature to fulfill all their needs. A fight for nature is thus a fight for humans.

“The total area covered by the world’s cities is set to triple in the next 40 years – eating up farmlands and threatening the planet’s sustainability” [2]

Shanghai in China, one of three countries where 37% of all future urban growth is expected to take place. Photo Credit: Philipus/Alamy

 

 

In this paper, we discuss how restoration and reservation have an important role to play in conservation but have limited reach and how reconciliation, on the other hand, emerges as conservation hero with its far reach and ease of application in urban settings where most of the world’s human populations reside.

Reservation

Large reserves are a safety net against unanticipated ecological consequences because they are relatively free from human disturbances. [2]

tiger

Pench Tiger Reserve

Photos courtesy: Madhya Pradesh Forest Department, India.

 

An example of successful reservation is Project Tiger in India, administrated by the National Tiger Conservation Authority (NTCA) governing 50 tiger reserves. Today, India is home to 70% of the world’s tigers and the growth figures look encouraging.

graph tiger

Data Source: World Wildlife Fund and Global Tiger Forum.

Reservation demands land which is already scarce. Locals often see it as a displacement of their homes and livelihoods building resentment in them. While reservation may increase eco-tourism and jobs related to it, the question of whether it is the most profitable use of the land often drives political and social thinking, especially for landowners.

Restoration

Ecological restoration is the process of assisting the recovery of an ecosystem that has been degraded, damaged or destroyed. [5]

Restoration projects tend to be small-scale as large-scale projects require heavy funding. Project goals and decisions are often tied to the degree of aspiration and resources available as well as to the extent of degradation to the site and the surrounding landscape.

Restoration projects are complex, take long periods of time and whether we can really restore an ecosystem to pristine is debatable. To be successful, restoration requires political alignment, realistic goal and objectives, cost-benefit analysis and financial support [4] making them difficult to implement and evaluate.

Reconciliation

According to Dr. Rosenzweig “reconciliation ecology is the science of inventing, establishing and maintaining new habitats to conserve species diversity in places where people live, work and play.”

By its mere definition, two things stand out, it can be done everywhere by people in their own habitats and it helps build diversity. Its beauty and effectiveness thus lie in its simplicity.

Gaia Vince says “Urban areas could be the best hope for the survival of many species, but to do so we need to incorporate the natural world in new and innovative ways.”

According to a theory of the biologist E. O. Wilson, biophilia is an innate and genetically determined affinity of human beings with the natural world. The Biophilic Cities Project has worked with cities like San Francisco in the United States, Singapore, Wellington in New Zealand, and Birmingham in the United Kingdom to explore the different ways a city could be biophilic. [8]

For example, Tucsonans have made a conscious effort to share their city space with native birds and provide bird habitats right within their own habitat. (Tucson Bird Count)

Sometimes sharing is accidental and sometimes it is purposeful but, in both cases, it works and is quite cheap. [6]

Example:  The Turkey Point power station, Miami.

To cool the hot effluent of the nuclear reactor, Florida Power and Light gouged 80 miles of giant cooling canals into the adjacent land. A rare species of saltwater crocodile moved flourished here. Instead of slaughtering them, the company hired a permanent team of biologists to make the new habitat even more croc-friendly. [9]

0809-crocs

Biologist Mario Aldecoa, holds a handful of crocodile hatchlings he captured near the Turkey Point Nuclear Power Plant in Homstead, Fla. Picture credits: Wilfredo Lee/AP

 

“Does reconciliation make money or cost money?”

In many cases, reconciliation may not just be cheap but actually create sources of income such as the Red Sea Star Restaurant in Eliat, Israel. [6]In this case, builders saved money and the birds were saved. Today’s salt marsh resembles a natural habitat on a refuse dump and produces wildlife food at four times the rate of a natural salt marsh. [6]

Conclusion

Since large mammals will never be able to make cities their homes and many ecosystems are malfunctioning due to human interventions, restoration and reservation will continue to play a key conservation role. However, these efforts are expensive, time-consuming require political alignment and funding and have limited scope as they cannot be applied everywhere.

The 6th mass extinction is a real threat that can be altered by promoting biodiversity.  “Increasingly we should turn to reconciliation ecology because avoiding the impending mass extinction will require employing it extensively” [6]. As more cities dot the global map and hold most of the world’s human population, reconciliation ecology emerges as a game changer to make humans connect with nature and promote biodiversity.

Can we stop the urban sprawl, I think not, but can we bring nature back to cities, the answer is definitely yes and reconciliation is the everyday urban superhero poised to do it.

superman

Reconciliation the Conversation Hero

Photo Credit: DC Comics

 

Every urban citizen can don the reconciliation cape with little effort and investment.

Saalumarada Thimmakka a 106-year-old lady of very modest means, was awarded India’s fourth highest civilian award for her tireless effort to make the planet green by planting 8000 trees in 80 years. [10]

 

This is proof of the concept that “Reconciliation ecology thrives incrementally. It does not require the grand design, the universally accepted paradigm. Every little contribution can add meaningfully to the dream.” [6]

president

Indian President Ram Nath Kovindsaid “At the Padma awards ceremony, it is the President’s privilege to honour India’s best and most deserving. But today I was deeply touched when Saalumarada Thimmakka, an environmentalist from Karnataka and at 107 the oldest Padma awardee this year, thought it fit to bless me”

Photo Credit: PTI

 

References

  1. Georges, L.J. Hone, R.H. Norris, Applied Ecology, Encyclopedia of Ecology 2008, Pages 227-232, available at: https://www.sciencedirect.com/science/article/pii/B978008045405400848X
  2. Lindenmayer, D.; Burgman, M. A. (2005) Practical conservation biology. Chapter 4 in Practical conservation biology pp. 87—119.
  3. Mark Swilling, The curse of urban sprawl: how cities grow, and why this has to change, available at: https://www.theguardian.com/cities/2016/jul/12/urban-sprawl-how-cities-grow-change-sustainability-urban-age
  4. Rohr, Jason R et al. “Transforming ecosystems: When, where, and how to restore contaminated sites.” Integrated environmental assessment and management vol. 12,2 (2016): 273-83. doi:10.1002/ieam.1668
  5. Clewell AF, Aronson J (2013) Ecological restoration: principles, values, and structure of an emerging profession. 2nd edition. Island Press, Washington, D.C
  6. Rosenzweig, L. G. (2003) Win Win Ecology: How the earth’s species can survive in the midst of human enterprise. Oxford University Press, 7-89.
  7. Gaia Vince, Why we need to bring nature back into cities, BBC: http://www.bbc.com/future/story/20130530-bringing-nature-back-into-cities
  8. Tim Beatley , Geodesigning Nature into Cities, available at https://www.esri.com/about/newsroom/arcnews/geodesigning-nature-into-cities/?rmedium=arcnews&rsource=https://www.esri.com/esri-news/arcnews/winter16articles/geodesigning-nature-into-cities
  9. Johns Hopkins Bloomberg School of Public Health, Ecologist Urges Sharing Land with Other Species to Foster Biodiversity, available at https://www.jhsph.edu/news/stories/2004/reconciliation.html
  10. Madur, Saalumarada Thimmakka – The Green Crusader, 2019, available at https://www.karnataka.com/personalities/saalumarada-thimmakka/
  11. Public Affairs Media Contacts for the Johns Hopkins Bloomberg School of Public Health: Tim Parsons or Kenna Brigham (7 March 2004) Extracted from: https://www.verywellmind.com/how-to-reference-articles-in-apa-format-2794849

The importance of value in species prioritisation – a holistic approach to the problem.

By Harry Stephens

Introduction

Discussion surrounding the ‘Noah’s Ark Problem’ (Weitzman 1998, Perry 2010, Small 2011) – a parable for conservation triage, has received heightened attention in recent years. This corresponds to an accelerated increase in species loss worldwide and subsequent costs associated with protecting many that are threatened (Butchart et al 2010). In conservation, ‘triage’ is the prioritisation of limited resources to maximise returns, relative to the goals, under a constrained budget (Bottrill et al 2008). Practically, it entails treating the ‘most valuable’ first, then dedicating fewer resources or abandoning the ‘less valuable’. The problem lies in taking values from an array of professional backgrounds, then determining comprehensive conservation objectives and management practices from these. Humans differ in their interest and attitude toward nature and naturally, approaches will be conflicting.

Obtained from http://framingpainting.com/UploadPic/2010/big/Noah%27s%20ark.jpg

A traditional Noah’s ark scene from which modern day triage is based. Obtained from http://framingpainting.com/UploadPic/2010/big/Noah%27s%20ark.jpg.

The meaning of ‘value’

Fundamental to triage is recognition that scarce resources should not be wasted on the severely injured as they are unlikely to recover – we have to set priorities based on economic, ecological and aesthetic factors (Small 2011, Arponen 2012). There is not ‘one fits all’ criterion to determine where resources are allotted, as the definition of ‘conservation benefit’ depends on a various set of human values and beliefs. For example, the conservation scientist’s ‘value’ of a species generally refers to ecological or functional importance and is the key factor in prioritisation (Perry 2010). However, politicians may view a species based on economics, public expectation or aesthetics, sometimes dividing scientists and policy makers (Wittmer et al 2013). This has been observed in Australia and New Zealand, with the Office of Environment and Heritage and DOC respectively, demonstrating the difficulty in establishing an appropriate basis for decision-making around threatened species (Kilham and Reinecke 2015).

Science alone cannot dictate decision-making

Often, it has been suggested that prioritisation is not a scientific matter; rather it depends on what is valued (Arponen 2012). Furthermore, the fact that most funding for conservation comes from public sources (AEDA 2012), justifies people having more input into triage style decisions. Scientific research alone cannot be a robust foundation on which to implement conservation decisions, as it is based on imperfect information in a dynamic environment and thus, will always be questioned by political, economic and public bodies (Marris 2007, Kilham and Reinecke 2015). There is also uncertainty regarding species biology and population dynamics (Marris 2007, McDonald-Madden et al 2008, Arponen 2012), which has associated ecological risks like species interaction disruptions if science was to ‘get it wrong’. Even the most thoroughly studied organisms like Drosophila spp. have only been observed over a relatively short evolutionary time and there is still a lot to learn; the influence of a changing climate means that the cost and benefits of preserving species is also changing (Arponen 2012).

Species appeal and people power

Humans are programmed to like certain beautiful or decorative features of nature like flowers, fur, feathers and antlers (Small 2012). The idea of using charismatic or flagship species bearing these appealing characteristics to support other projects has received little acknowledgement from the scientific community (Andelman and Fagan 2000, Small 2012). A study by Brambilla et al (2013) on Italian bird species even suggested that conservation based on appeal could see species more susceptible to human influence from an Anthropogenic Allee Effect, exacerbating their threatened status.

However, species appeal may be the most effective driver in generating conservation dollars. Flagship, iconic and charismatic species like Grizzly bears (Ursus arctos), Californian Condors (Gymnogyps californiacus) and many large, African mammals may not have as much of a perceived value ecologically, but their appeal produces revenue from tourism and hunting, among other means (Arponen 2012). They also serve as highly visible examples of global conservation, and the public is willing to donate toward their management (Clough 2010, Small 2011). Indirectly, they are important for education and raising awareness which together increase the value of ecosystems and assist in funding projects for their more ecologically beneficial relatives (Perry 2010, Bennett et al 2015).

Conclusion

Just as Noah was limited by space aboard his Ark, decision makers are limited in the amount of biodiversity they can apply resources to. The ultimate objective is to preserve biodiversity, though the approach needs to equally recognize the biological, social and economic elements that reflect ideas of the involved parties. Tools like the Project Prioritisation Protocol (PPP) (Joseph et al 2008, Kilham and Reinecke 2015) are widely used and integrate these aspects based on trade-offs of ecological benefit, cost, success and species value resulting in a rank-ordered list of management actions. Inclusive tools such as the PPP are likely to become more common, as subjective and value-driven opinions concerning priority setting cannot be formed without unbiased consideration.

References

Andelman, S. J. and Fagan, W. F. 2000. Umbrellas and Flagships: Efficient Conservation Surrogates or Expensive Mistakes? National Academy of Sciences. (97) 11:5954-5959.

Applied Environmental Decision Analysis research hub (AEDA), 2012, On triage, public values and in­formed debate. Decision Point, No.65, p. 4.

Arponen, A. 2012. Prioritizing species for conservation planning. Biodivers Conserv 21:875-893

Bennett JR, Maloney R, Possingham HP. 2015 Biodiversity gains from efficient use of private sponsorship for flagship species conservation. Proc. R. Soc. B 282: 20142693

Bottrill M, Joseph LM, Carwardine J, Bode M, Cook C, et al. 2008 Is conservation triage just smart decision-making? Trends Ecol Evol 23: 649–654.

Brambilla, M., Gustin, M., Celada, C. 2013. Species appeal predicts conservation status. Biological Conservation 160:209-213.

Butchart, S.H.M., Walpole, M., Collen, B., van Strien, A., Scharlemann, J.P.W., Almond, R.E.A., Baillie, J.E.M., Bomhard, B., Brown, C., Bruno, J., Carpenter, K.E., Carr, G.M., Chanson, J., Chenery, A.M., Csirke, J., Davidson, N.C., Dentener, F., Foster, M., Galli, A., Galloway, J.N., Genovesi, P., Gregory, R.D., Hockings, M., Kapos, V., Lamarque, J.-F., Leverington, F., Loh, J., McGeoch, M.A., McRae, L., Minasyan, A.,

Hernández Morcillo, M., Oldfield, T.E.E., Pauly, D., Quader, S., Revenga, C., John, R., Sauer, J.R., Skolnik, B., Spear, D., Stanwell-Smith, D., Stuart, S.N., Symes, A., Tierney, M., Tyrrell, T.D., Vié, J.-C., Watson, R., 2010. Global biodiversity: indicators of recent declines. Science 328, 1164–1168.

Clough, P., 2010. Realistic valuations of our clean green assets. New Zealand Institute of Economic Res. NZIER 19/2010.

Joseph, L. N., Maloney, R. F., O’Connor, S. M., Cromarty, P., Jansen, P., Stephens, T. and Possingham, H. P. 2008. Improving methods for allocating resources among threatened species: the case for a new national approach in New Zealand. Pacific Conservation Biology. 14:3.

Kilham, E. and Reinecke, S. 2015. “Biggest bang for your buck”: Conservation triage and priority-setting for species management in Australia and New Zealand. Invaluable Policy brief 0115.

Marris, E. 2007. What to let go. Nature. (450) 8

McDonald-Madden, E., Baxter, P. W. J., Possingham, H. P. 2008. Making robust decisions for conservation with restricted money and knowledge. Journal of Applied Ecology, 45, 1630–1638

Perry, N. 2010. The ecological importance of species and the Noah’s Ark problem. Ecological Economics 69, 478–485

Small, E. 2011. The new Noah’s Ark: beautiful and useful species only. Part 1. Biodiversity conservation issues and priorities, Biodiversity, 12:4, 232-247,

Small, E. 2012. The new Noah’s Ark: beautiful and useful species only. Part 2. The chosen species, Biodiversity, 13:1, 37-53

Weitzman, M.L. 1998. The Noah’s Ark problem. Econometrica 66:6 1279-1298.

Wittmer, H. U., Serrouya, R., Elbroch, M. and Marshall, A., J. 2013. Conservation strategies for species affected by apparent competition. Conservation Biology. 27:2. 254-260.