A Busy Season Ahead

The scientific name of the Whooping Crane is Grus americana but I always thought it should be Grus problematica. One would think it would be simple to switch from the aircraft-led migration method that required months of training to a parent-reared method where nature does much of the work, but that’s not the case. I will try to explain some of the complications but I warn you, it will take some time and the results will likely provide more questions than answers.

The Whooping Crane Recovery Team must balance the allocation of the available eggs between the Louisiana Non-Migratory Population (LNMP) and the Eastern Migratory Population (EMP). To do that they have proposed that the eggs produced in the captive breeding centers should go to Louisiana and the EMP should use eggs that can be collected from the nesting birds at Necedah NWR. 

For the past three years, the biologist at Necedah has been experimenting with a forced re-nesting study. The early nests produced at Necedah every spring seem to coincide with peak of black fly season so he has been collecting all the eggs from half the nests and leaving the other half as his control group. Pairs that lose their eggs early in the incubation cycle will often re-nest, and that generally occurs after the short black fly season has run its course. Those later nests are generally more successful. In fact, twenty-three chicks were hatched last year at Necedah. There is a downside to this practice, as it requires intensive management. A full time team must monitor the cranes and the air temperatures to estimate when the black flies will emerge and when to collect the eggs. Long-term, intensive management is not one of the characteristics of a self-sustaining flock. Still, the Refuge is willing to continue for now as it provides eggs that will hatch into chicks that we can then release into the Wisconsin Rectangle. A few nests just outside of Necedah are also affected by the black fly issue. More eggs could be collected if they included those nests; however, they have to guesstimate when to limit collection lest they overwhelm the captive breeding centers with eggs.

Nest abandonment happens quickly when the black flies are thickest. The eggs are collected over a short time period and are transferred to ICF, and maybe eventually to Patuxent in Maryland. That means the captive centers are inundated with eggs around the same time that their captive birds are producing, resulting in a heavy workload.

That same principle of multiple clutches is also applied to the captive breeding cranes. Eggs collected from them are hatched in incubators, prompting them to produce more. Except, of course, if they have to stop the production and allow the adults to raise young chicks for the parent-reared (PR) project. That balancing act limits the breeding centers to a combined production to around fifteen parent-reared birds per breeding season.

There is also a Canadian Whooping Crane breeding center at the Calgary Zoo in Alberta. Last year, they produced three parent-reared chicks but could not get them into the U.S. in time for a release in Wisconsin. Shipping live animals across the Canada/U.S. border usually involves livestock transported in trucks or on trains. There are only a few ports of entry at airports that can deal with animals, including endangered birds. The only commercial aircraft flying out of Calgary to the nearest of those entry points does not have cargo doors large enough to handle the crates in which the cranes are transported. Instead, they were flown in a larger aircraft to Texas, which is much closer to Louisiana, so they were added to that release program.

All of this has to do with eggs collected from the wild or produced in captivity. And, just like every year, that’s a guessing game played by professionals with years of experience with captive breeding birds. But not all of the eggs hatch. The formula for calculating the number of eggs that will hatch into chicks is roughly 75 percent, and 75 percent of those that hatch will survive to be released. That calculation has been simplified and updated recently to 59 percent of fertile eggs will result in releasable chicks.

To all of this balancing, calculating, estimating and guessing, WCEP has added another variable. We also hope to produce a small group of costume-reared whooping cranes in 2017. If approved, and if there are enough eggs available, and if the captive centers can handle the workload, we may be moving six to eight costume-reared chicks to the White River Marsh pen facilities early in the season. Our first objective is to get more birds into the Wisconsin Rectangle but we also want to experiment with improvements to the PR release method.

One of the issues that concerned WCEP last year was the inability or reluctance of some of the PR birds to fly when they were first released. That is not surprising, considering that Whooping Cranes fledge at 80 to 100 days of age. For the parent-reared birds, that happens when they are in captivity where they can’t get airborne for more than a few yards. The costume-reared cranes we will raise at White River Marsh will spend the summer learning to fly at the appropriate time. This fall when both the costume-reared and parent-reared cranes are released, we will be able to compare the difference.

Philopatry, or their propensity to return to where they were introduced, is also a problem. Birds that are released late in the fall may not form an affiliation to the area as wild cranes would to their natal area. Costume-reared birds at White River Marsh will spend the entire summer there and, during that time, we expect they will have opportunities to interact with some of the adults that use the marsh. Although it will be a small sample size, by the spring of 2018 we should be able to compare the behavior of both groups.

Our job is to replicate the natural life cycle of these birds as best we can. Ideally, the cranes we reintroduce would spend as much time as possible in the wild, so the plan is to transport them to White River Marsh at the earliest shippable age, around 35 days. Our pen facilities include a dry pen that is fully enclosed and a visually open, wet pen where the cranes can roost at night. If this all works out, we will enlarge that pen to include not only the water but also more uplands. We will seed the pen with natural foods like insects and crayfish so the chicks learn to forage as they would in the wild.

Ideally, chicks would spend the summer with their parents and maybe in the future we could arrange for some adult role models during that time. That would be about as close as we could come to providing a natural environment for reintroduced cranes but it wouldn’t be easy. We may be able to use captive adults that are too old to reproduce, yet still have nurturing skills – if they exist. And what do we do with them over the winter while the chicks they raised head south? And how many chicks could a pair raise? Two would be the maximum in the wild but that means we’d need lots of non-reproductive adults to act as alloparents, and many pens to get a reasonable sample size.  Still, it would be an interesting learning opportunity with much to gain if it worked.

As I mentioned earlier, twenty-three chicks were hatched at Necedah last year and I am sure you all know that none of those birds survived. With intense nest management, the black fly problem has been circumvented, at least for now, but we don’t yet know what is causing the post-hatch mortality. This year, OM’s ecologist, Jeff Fox, will be working with Refuge Biologist, Brad Strobel, and Professor Misty McPhee from UW Oshkosh to find out what is happening to those chicks during that vulnerable stage before they can fly. The new study, Survival and Cause-Specific Mortality of Whooping Crane Chicks on the Necedah NWR has been approved for this year. According to Pete Fasbender, Field Supervisor for the US Fish and Wildlife Service, Twin Cities Ecological Services Field Office, “There is no higher priority for our eastern U.S. reintroduction project to achieve success than determining the cause of Whooping Crane chick mortality in their first 90 days of life.”

The Whooping Crane Recovery Team recently conducted a population viability analysis (PVA) that included all the Whooping Crane populations. For the EMP it was determined that only a moderate reduction of mortality from egg to fledge, from 92-96% to ~ 85% is needed to stabilize the population and eventually reach our self-sustaining goal.

We have two pairs that frequent the White River Marsh that have now reached breeding age. We hope to relocate our camera, getting it close enough to monitor at least one pair during their incubation and, with luck, be able to track them as they introduce their chick to the surrounding habitat. Remember that “the beast” was so named for a reason, it will not be easy relocating it deep in the marsh, or guessing where the birds will nest before that process begins. But, if we are successful, it will be the first time in history that nesting and nurturing Whooping Cranes will be captured on streaming video and broadcast live.

If all of this comes to fruition, it will be a busy season. We will be monitoring nesting birds in the spring and attempting to capture one pair on camera. Depending on egg availability/survival, we will be caring for costume-reared chicks at the White River Marsh pen and assisting with the releases and intensive monitoring in the fall, while trying to determine what is causing the loss of all those chicks at Necedah. Plus, we have our ongoing job of capturing the growing list of birds that must have non-functioning transmitters replaced.

This is just an outline of the plan and a lot of details have yet to be finalized within the various WCEP teams. Each project has pros, cons, and a hundred variables. If we can sort them out ourselves, we will keep you posted.

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17 Comments

  1. Michele March 7, 2017 5:58 pm

    So many “ifs” and so much hope! OM can do it. OM has been first at many things with the whoopers, why not first to film a nest? 🙂 We will all be glued to watching “if” all the stars line up and we hold our mouths just right. hehehe We are all with you.

  2. Catherine Wohlfeil March 6, 2017 9:55 pm

    CONGRATULATIONS! Job well done. I can’t imagine a better organization to conduct this work and see it through to fruition.

    The costume rearing method will allow the up close and personal observation needed for scientific study. It will also provide the opportunity to proactively approach such issues as instruction of the chicks in such things as predator avoidance, foraging, and insight into the observation and promotion of such personality characteristics as flock mentality and leadership, dominance, initiative, nurturing spirit, and constructive group cohesiveness which could lead to the key to survival instinct.

    This will be a wonderful time and a turning point in their future survivability. I truly believe the future will hold a rebirth of the ultralight training program simply because it will prove to be a constructive and proactively vital necessity in determining the future of the flight path and guidance in both the areas of migration initiative and predator avoidance training. The mightiest of birds can sometimes learn to follow if finding the reason and instinctive trust needed to do so.

    As to parenting, humans it is said, typically have 2.5 children per couple, but who is to say more chicks could not be added to the mix. And what parent wouldn’t feel more wholly blessed by the addition of a large family of little ones in their midst. It would reawaken the mating spirit in any of these beautiful angels.

    And as to what to do with the parents as they watch their little ones take flight to the south… well… what better ending and what better reason to begin the creation of… Disney North…

    Bless you all. Keep up the wonderful work…

  3. Susanne Shrader March 6, 2017 9:44 pm

    I am thrilled that I made a donation of stock and know that, in a small way, I am supporting your valiant efforts.

  4. Cheryl Murphy March 6, 2017 5:55 pm

    I’m beyond excited! Thank you Joe for your very interesting and detailed post. Looking forward to a successful season st WRM. Whoopee!!

  5. Dora Giles March 6, 2017 2:23 pm

    Thank you for this great and exciting information. Looking forward to this coming Spring, Summer and Fall. Know all the hard work will be worth every ounce of strength and patience that this lovely, beautiful birds will require. Know all of OM crew is excited about this new plan and we all pray that it works. Hopefully the two 5 year old pairs will not disappoint us and nest and raise a chicklet.

    http://OM

  6. Cal Holland March 6, 2017 1:27 pm

    With the dedication of the White River Marsh Whopping OM crew of which I am some what acquainted with I say this will be done with out any hang ups. They are a dedicated lot of people that do not give up. I will be looking forward to the completion of the placing of the camera.

  7. Russell Allison March 6, 2017 1:10 pm

    Heck that sounds like a snap to do. NOT!!! Good luck with every thing Joe. We will all be following the whole plan. Go Whoopers.

  8. lilbirdz March 6, 2017 12:52 pm

    Whoop! This is a very complex and demanding operation, but if anyone can do it, OM can. They already know all about hard work, the vagaries of Mother Nature, and the enormous advantage of just a little bit of luck now and then. May the Force be with you!

    http://operationmigration.org/InTheField

  9. Mollie Cook March 6, 2017 11:56 am

    Oh wow, this is so exciting Joe. May it all work & come to pass. You have full Craniac support!!!!!

  10. Dorothy N March 6, 2017 11:36 am

    THANK YOU, JOE, for such a complete and informative report. I’m heartened to hear of the plans to protect the young introduced cranes and study the reproducing cranes. I’m hoping “the beast” is a webcam and that we can share in the observation of the selected nest. Very exciting!!!

  11. PattiLat March 6, 2017 10:50 am

    Yes, “A Busy Season Ahead!” It is hard to picture the many facets in the work coming up very, very soon. Just thinking about the planning of these new adventures in recovery has me tuckered out. You are all, however, up to the task; you’ve proven this year after year. As Jane has said, “Extremely impressive!”

  12. Jeanne Huie March 6, 2017 10:02 am

    Thank you for telling us about the upcoming season! Lots of work; wishing OM and the birds great success!

  13. Anne Harrington March 6, 2017 9:57 am

    Wow indeed.

    What a complex, intellectually challenging, multi-pronged operation this has become.

    Thanks for the update.

    Looking forward to this summer’s eggs, chicks and parents.

  14. Elsie Sealander March 6, 2017 9:45 am

    It is all this hard work that needs to be known by the public so that the shooting of Whooping Cranes will come to an end.

  15. Jean P. aka CrabtowneMd March 6, 2017 9:24 am

    WOWSER ! ! that is fantastic news. The upcoming season will have so many intriguing opportunities to learn about and help Whoopers.
    I see the need for another cam or at least some live-streaming sessions in addition to the Beast. 🙂 Hoping and praying for great funding, good weather, able volunteers and many eggs, chicks and fledges ! WHOOP ! WHOOP! (y) 🙂

  16. Lindi Allen March 6, 2017 8:23 am

    Wow, sounds like a really busy year ahead, hope all turns out for the good of all involved. Will be interesting to see how things turn out.

  17. Jane Maher March 6, 2017 8:11 am

    Extremely impressive, Joe.