Translocation digest: July 2013

Projects:

Free State's first wild cheetah in 100 years
News24
"This reintroduction marks an extremely important moment in our battle to save the Cheetah from extinction. The reintroduction is the culmination of years of work and the building of great relationships and we are extremely excited to be returning this ...

Volunteer to report wild turkey sightings
WDEL 1150AM
This reintroduction resulted in today's 5,000 wild turkeys in Delaware, which are crucial to the annual turkey hunting season. The information gathered by volunteers will help track wild turkey health, distribution and reproductive success. If you spot ...

First Killer Whale Reintroduced to Wild Has Baby National Geographic The only killer whale known to be put back into the wild after human intervention was spotted with her first baby last week. In 2002, a young killer whale named Springer was reintroduced to her pod in northern Vancouver Island (map), Canada, after she ... See all stories on this topic »

Osprey chicks to be reintroduced to the wild Dubuque Telegraph Herald Nature lovers and the simply curious can witness the reintroduction of osprey chicks Wednesday morning. The chicks will be reintroduced as part of the Mud Lake Osprey Project at 9 a.m. at Mud Lake Park, according to a news release. Translocating animals outside home turf is high risk ... Times of India AHMEDABAD: The latest guidelines of the International Union for Conservation of Nature (IUCN) on translocation of wildlife could prove to be a major ... Park life: The Cairngorms' lost beasts BBC News But beavers are just one animal on a list of 22 creatures assessed for potential reintroduction, or targeted conservation efforts, to Britain's largest national park. Wildlife on the list were either were wiped out because of over-hunting or ... See all stories on this topic » First Persian leopard cubs born in Russia for 50 years Phys.Org The Persian Leopard Reintroduction Program is run by the Ministry of Natural Resources and Environment of the Russian Federation with participation of the Sochi National Park, Caucasus Nature Reserve, A.N. Severtsov Institute of Ecology and Evolution, ... See all stories on this topic » Endangered minnow being reintroduced in MissouriKansas City Star A once abundant minnow that's been listed as federally endangered for 15 years and is now “in serious trouble” in Missouri is being reintroduced into waterways ... See all stories on this topic »

Publications:

Converse, S. J., Moore, C. T. and Armstrong, D. P. (2013), Demographics of reintroduced populations: Estimation, modeling, and decision analysis. The Journal of Wildlife Management, 77: 1081–1093. doi: 10.1002/jwmg.590

GRIFFITHS, C. J., ZUËL, N., JONES, C. G., AHAMUD, Z. and HARRIS, S. (2013), Assessing the Potential to Restore Historic Grazing Ecosystems with Tortoise Ecological Replacements. Conservation Biology, 27: 690–700. doi: 10.1111/cobi.12087

HUNTER, E. A., GIBBS, J. P., CAYOT, L. J. and TAPIA, W. (2013), Equivalency of Galápagos Giant Tortoises Used as Ecological Replacement Species to Restore Ecosystem Functions. Conservation Biology, 27: 701–709. doi: 10.1111/cobi.12038

Reynolds, M. H., Weiser, E., Jamieson, I. and Hatfield, J. S. (2013), Demographic variation, reintroduction, and persistence of an island duck (Anas laysanensis). The Journal of Wildlife Management, 77: 1094–1103. doi: 10.1002/jwmg.582

Seidel, S. A., Comer, C. E., Conway, W. C., Deyoung, R. W., Hardin, J. B. and Calkins, G. E. (2013), Influence of translocations on eastern wild turkey population genetics in Texas. The Journal of Wildlife Management, 77: 1221–1231. doi: 10.1002/jwmg.575

Sites, J. W. (2013), Extinction, reintroduction, and restoration of a lizard meta-population equilibrium in the missouri ozarks. Molecular Ecology, 22: 3653–3655. doi: 10.1111/mec.12357

SMYSER, T. J., JOHNSON, S. A., PAGE, L. K., HUDSON, C. M. and RHODES, O. E. (2013), Use of Experimental Translocations of Allegheny Woodrat to Decipher Causal Agents of Decline. Conservation Biology, 27: 752–762. doi: 10.1111/cobi.12064

Remote sensing in reintroduction planning: oryx recovery in Chad

I was really pleased when I discovered the paper by Terri Freemantle and co-authors featured in this post, as I've been thinking about the potential for remote sensing to contribute to reintroduction programmes for a while now. One reason for this is the increasing frequency with which authors call for adequate assessments of habitat which recognise that due to global environmental change, the habitat may have altered since the species was extirpated. However, from the literature I've read, satellite-derived data is more readily used in predictive studies concerned with the potential for range shift and the feasibility of assisted colonisation. To me, it seems imperitive that reintroductions are just as careful to assess habitat suitability and the recent improvement in data that is available on global climate, vegetation and human impact should enable this to happen.

The paper concerns the scimitar-horned oryx (Oryx dammah) and its potential reintroduction to a Sahelian/sub-Saharan region of Chad. As a herbivore, a major aspect of habitat suitability is the availability of forage and this can be detected as photosynthetically active vegetation in other words, green plants. The study identified a 'greening' of the Ouadi Rimé-Ouadi Achim Game Reserve which the authors attribute to an overall increase in precipitation since the 1970s. They were also able to rule out hypotheses presented in previous studies that the increase in plant cover was due to human land use changes. They did this using a Human Footprint Index comprising data on transport, night-time lights, urban areas, land cover and population density to a resolution of 1 km. Whilst human disturbance has been relatively low and is not thought to be the driver behind greening, Freemantle et al indicate that the Reserve boundaries need to be enforced to prevent human encroachment onto now favourable pasture. The spatial variation in where greening has occured means that the oryx habitat may become squeezed as their preferred environment, the ecotone between desert and grassland, becomes narrower.

The authors admit that remote sensing techniques might be a crude tool for habitat evaluation but I agree with them that at landscape-scale, these methods offer a valuable source of information prior to undertaking any conservation translocation.  I would go further to point out that I know of few other studies that have incorporated human impact on this scale into a reintroduction planning exercise.  The data is there and available for anyone who wants to use it and I suggest that more people copy this example.

Freemantle, T. P., Wacher, T., Newby, J., & Pettorelli, N. (2013). Earth observation: overlooked potential to support species reintroduction programmes. African Journal of Ecology, n/a–n/a. doi:10.1111/aje.12060

IUCN/SSC Guidelines for Reintroductions and Other Conservation Translocations - final version released

Just a quick update to let everyone know that the fully formatted version of the IUCN/SSC Guidelines for Reintroductions and Other Conservation Translocations (including annexes) has now been released and you can get a copy by emailing me: s.e.dalrymple@gmail.com or following this link:
http://www.issg.org/pdf/publications/RSG_ISSG-Reintroduction-Guidelines-2013.pdf

It's the same in content as the 'interim' version which I know many of you have seen but the final release looks nicer and has the full citation details:

IUCN/SSC (2013). Guidelines for Reintroductions and Other Conservation Translocations. Version 1.0. Gland, Switzerland: IUCN Species Survival Commission, viiii + 57 pp.  ISBN: 978-2-8317-1609-1

Translocation digest - April 2013

SA, Botswana in rhino translocation deal
South Africa.info
The translocation was facilitated in partnership with conservation organisation Rhino Force and funded by insurance administrator Motorite Administrators.

&Beyond translocate six white rhino to Okavango Delta
Bizcommunity.com
Translocations are fundamental to secure the survival of endangered species. This project is led by &Beyond's conservation team and aims to increase ...

Kihansi Toads Reintroduced in the Wilderness
AllAfrica.com
Kilombero — TANZANIA has gone down in history as the world's first country to successfullyreintroduce into the wild amphibians that had been in danger of extinction. This has been revealed during the release of the second batch of 1,500 Kihansi Spray ...

The Reintroduction of Wolves | Skeptoid
Out of the efforts of these latter a federal wolf reintroduction program was born, the future of which has been the subject of a long and bitter debate in the ...

Reintroduction of Wolves Remains Contentious - Arizona Public Media
A recovery effort has been underway for decades and reached a milestone in 1998 when wolves werereintroduced into their historic territories in Arizona and ...

Conserving the Aplomado falcon
The Northern Aplomado Falcon is a beautiful raptor with a former range including all of South America, Central America, Mexico, and the southwestern United States. It's also critically endangered. That's why Bill Heinrich, Species Restoration Manager for The Peregrine Fund, is working to restore this species to its former U.S. range.


Publications:

La Haye, M. J. J., Koelewijn, H. P., Siepel, H., Verwimp, N. and Windig, J. (2012). Genetic rescue and the increase of litter size in the recovery breeding program of the common hamster (Cricetus cricetus) in the Netherlands. Relatedness, inbreeding and heritability of litter size in a breeding program of an endangered rodent. Hereditas, 149: 207–216. doi: 10.1111/j.1601-5223.2012.02277.x

King, R. S., Trutwin, J. J., Hunter, T. S. and Varner, D. M. (2013), Effects of environmental stressors on nest success of introduced birds. The Journal of Wildlife Management. doi: 10.1002/jwmg.528

Bell, T. J., Powell, K. I. and Bowles, M. L. (2013), Viability model choice affects projection accuracy and reintroduction decisions. The Journal of Wildlife Management. doi: 10.1002/jwmg.525

Jachowski, D. S., Slotow, R. and Millspaugh, J. J. (2013), Delayed physiological acclimatization by African elephants following reintroduction. Animal Conservation. doi: 10.1111/acv.12031

HARRINGTON, L. A., MOEHRENSCHLAGER, A., GELLING, M., ATKINSON, R. P. D., HUGHES, J. and MACDONALD, D. W. (2013), Conflicting and Complementary Ethics of Animal Welfare Considerations in Reintroductions. Conservation Biology. doi: 10.1111/cobi.12021

HUNTER, E. A., GIBBS, J. P., CAYOT, L. J. and TAPIA, W. (2013), Equivalency of Galápagos Giant Tortoises Used as Ecological Replacement Species to Restore Ecosystem Functions. Conservation Biology. doi: 10.1111/cobi.12038

Planning translocations under a changing climate

Just before Christmas I attended the British Ecological Society Annual Meeting at the University of Birmingham and saw a talk by Alienor Chauvenet of ZSL. Her talk, entitled 'Planning translocations under a changing climate' used the example of the hihi, Notiomystis cincta, to explore some ideas she originally proposed in her paper in Animal Conservation last year (reference below).

Chauvenet noted, as I have in my systematic review of plant reintroductions, that climate change is very rarely cited as a motivation for undertaking translocations. However, climate change is not an issue that should be only be tackled when we discuss the pros and cons of assisted colonisation and other types of conservation introduction. Climate change has the potential to irreversibly alter the distribution of suitable habitat and therefore, needs to be accounted for in translocation projects whether it is a reintroduction or an introduction to new sites.

Both her paper and the BES talk propose a combination of methods to ensure that site selection in translocation projects maximises the success of reintroductions and assisted colonization under climate change. The strength of using a variety of methods to attempt to select translocation sites is made clear in

Combining data-led methods with expert opinion - how Bayesian approaches can bridge the gap between academia and practice.

With hindsight, I have mistakenly avoided Bayesian approaches to ecological modelling  because they incorporate prior beliefs. The quantitative scientist in me thought that this sounded a little too vague to be of use in conservation and would surely fall foul of bias towards preconceived ideas. However, after reading the paper featured below and the detailed supplementary materials, I am now a convert to Bayesian techniques and hope to incorporate them into my work in the future.


Laws & Kesler (2012) have developed a model for selecting translocation sites for the Guam Micronesian kingfisher (GMK), Todiramphus cinnamominus cinnamominus and to me, it seems like an excellent way of combining quantitative methods with common sense whilst incorporating the complexity of issues involved in selecting suitable sites for translocation. The best way I can explain their approach is to describe their inference diagram: imagine a tree where the main thing we're interested in, island suitability, is the trunk. The trunk splits into four branches representing ecological requirements, impacts on native species, anthropogenic threats and operational support. The tree continues to branch until the generic factors associated with any translocation (e.g. presence of disease, habitat protection laws, food availabilty) give way to GMK-specific factors (e.g. West Nile virus, protected areas, insect prey). At that point, my tree analogy breaks down because some of the 'twigs' feed into several branches but hopefully, you appreciate that this is a relatively straightforward way of representing the complexity in the GMK's translocation needs.


The next job is to assign conditional probablities to each of the factors that contribute to island suitability. For habitat suitability, the two components of available area of suitable vegetation and the extent of habitat fragmentation were modelled using data from 156 Micronesian islands and the occurence of kingfishers of the same genus as GMK. This was used as training data for the GMK model to select candidate translocation sites from 239 island. The rest of the modelling process relied on qualitative decisions to set categorical outcomes, for example, if predatory non-native species were present, the island would be deemed unsuitable. These were then translated into quanitative combinations for the purposes of the judging each island's suitability (see appendix A of the paper for more details).


Only five islands were considered suitable for GMK translocation and even then, they were thought to require varying levels of management. Site visits to the five islands found two of these to be unsuitable due to degraded habitats and lack of political support. The authors caution that the models are only as good as the input data they are built on.


I can see from Laws & Kesler's paper that Bayesian methods have real potential for bridging the gap between expert knowledge and data-driven correlative methods. However, we still need people with the statistical know-how to reach across the gap. Any volunteers?

Laws, R. J., & Kesler, D. C. (2012). A Bayesian network approach for selecting translocation sites for endangered island birds. Biological Conservation, 155, 178–185. doi:10.1016/j.biocon.2012.05.016

Is host tolerance to pathogens and herbivores is more beneficial than resistance in reintroduced populations?

In just about every set of reintroduction guidelines I’ve ever read, one of the primary recommendations is always to eradicate the threats that caused the extirpation of populations of the target species. However, dealing with threats that have an extensive impact are often impossible to eradicate or limit to a specific location.  In the paper summarised below, Matthew Venesky and his co-authors (Venesky et al. 2012) examine several lines of evidence to look at the incidence of pathogens and herbivores and how reintroductions can be optimised to cope with a threat that can’t easily be controlled.

The paper relies on three concepts to make their argument that particular traits are key to successful translocation of species threatened by non-native pathogens or herbivores: virulence, tolerance and resistance. Virulence is defined "as the per capita effects of a pathogen or herbivore". Host tolerance is expressed as the ability to withstand an attack with little loss of fitness. Resistance refers to the reduction of pathogen or herbivore impact through deterring infection or herbivory, or attacking the pests directly. Tolerance is thought to have a neutral or positive consequence for pest abundance whereas resistance has a negative impact on pathogen or herbivore abundance.

The main thesis is that the generation time of pathogens and herbivores (especially invertebrates) is shorter than that of their hosts and can therefore be subject to selection pressures that are exerted as a result of the negative influence of host resistance. This creates pest populations that evolve countermeasures against resistance mechanisms; the lag in the host response means that reintroduced populations suffer high mortality before developing adequate resistance. Hosts which exhibit tolerance rather than resistance do not place strong selection pressures causing increased virulence, and in some cases may even select for decreased impacts. As a result, captive breeding that selects for tolerant (rather than resistant) individuals for translocation, may maximise the chance that a reintroduction attempt will survive long enough to produce progeny.

The two case studies use examples of non-native organisms to explore how captive breeding might select for tolerance rather than resistance to cope with pathogens and herbivory. The first is the fungal pathogen Batrachochytrium dendrobatidis (Bd) that causes chytridiomycosis and has decimated amphibian populations across the world. Selection for resistance involves several suggested approaches including identifying indicators of infection but minimal loss in fitness.  The second example is the cactus moth (Cactoblastis cactorum) which was succesfully introduced to Australia to reduce the prevalence of non-native prickly pear (Opuntia spp.). Unfortunately, the cactus moth has exhibited similar voracity against two narrow endemic species of cactus in Florida. Selection for tolerant genotypes might involve identifying individuals that drop pads from the main plant when stressed by moth herbivory.

The final section of the paper adds some important caveats to the discussion that shifts in host tolerance may have unexpected consequences such as a trade-off for competitive abilities of the host and the existence of low levels of pathogens and herbivores that could act as a reservoir for invading non-tolerant communities. As a result, Venesky et al. (2012) recommend adaptive managment strategies and using an experimental approach to compare the survival of resistant and tolerant genotypes post translocation.

Venesky, M. D., Mendelson III, J. R., Sears, B. F., Stiling, P., & Rohr, J. R. (2012). Selecting for Tolerance against Pathogens and Herbivores to Enhance Success of Reintroduction and Translocation. Conservation biology, 26(4), 586–592. doi:10.1111/j.1523-1739.2012.01854.x

Decision tools for reintroduction but who actually uses them?

My post today was going to be a summary of a paper by Adam Schapaugh and Andrew Tyre of the University of Nebraska-Lincoln on Markov decision processes (MDPs). These enable conservation decision-making by dictating what action should be taken based on the state a system is in, and incorporates a reward for having taken the action. Schapaugh and Tyre have used as one of their examples, an hypothetical reintroduction to demonstrate this. MDPs require the user to describe the state variables, set what actions are associated with all the combinations of state variables, and construct a reward system that means the actions can be optimised to create the best outcome. In the paper this means that a set of state variables (e.g. source population size) affect which actions (e.g. capture and release) are undertaken to produce a target population of a given size through reintroduction.


Schapaugh and Tyre present a way of selecting the most relevant variables to include in order to make the best informed choices using MDPs. Their algorithm chooses the actions that maximises rewards where the rewards are set by the user to match their targets (e.g. creating a population of the target species). The actions which reap largest rewards are selected first; the actions which provide negligible or no reward are removed from the process. There is obvious application to species recovery programmes as a decision tool for when and how to act and this paper seems to present an approach for streamlining this potentially complex process.

I wish I was in a position to comment on the utility of their approach and critique it in a way that would be useful to conservation translocations. However, I am new to MDPs and instead would like to pose the question: who uses MDPs in the real world? This then leads me to ask: how do they (the practitioners) make the jump from algorithms in a paper to policy and implementation? And finally, how long does it take for advances such as the one presented in this paper to be absorbed into practice?

Feel free to comment - the questions above are not rhetorical and are a genuine attempt to understand the use of MDPs in relation to translocations.

Schapaugh, A. W., & Tyre, A. J. (2012). A simple method for dealing with large state spaces. Methods in Ecology and Evolution. doi:10.1111/j.2041-210X.2012.00242.x