
Spring/Summer 2005,
Vol. 16
No. 1
|
President's Report |
Greetings during an exciting time for cranes. On a positive note, the Whooping Crane
Eastern Partnership is poised to release as many as 25 more Whooping Cranes into
the wild this winter, both through the traditional ultralight-led
reintroduction method and a direct autumn release of up to 4 Whooping Cranes
into the already existing migrating Whooping Cranes from earlier ultralight-led
reintroductions.
The Proceedings from the Ninth North
American Crane Workshop, held in Sacramento, are about to be published. Authors should be receiving page proofs in
the next two weeks. If authors are
prompt about returning page proofs, we should have the Proceedings at the printer
two weeks after the proofs are back.
The printer has promised the Proceedings in a couple of weeks after
receiving it, so possibly by November???
One free copy goes to each author and conference registrant. Additional copies will be available for purchase,
but the details have not been ironed out at this time. We thank our editor, Felipe Chavez-Ramirez,
for the tremendous job he has done in organizing and editing this volume.
Our next meeting, the Tenth North
American Crane Workshop, is scheduled from February 7-10, 2006 in Zacatecas
City, Zacatecas, Mexico. This city was
founded in 1546 and has many historic buildings dating from the 16th
to 18th centuries. We will
kick off with a welcoming evening social on the 7th. There will be technical sessions, with over
40 papers, on Wednesday the 8th and Friday the 10th. Thursday, the 9th, will be set
aside for an all day field trip to local natural sites in the surrounding area,
which includes some of the most southern wintering areas on the continent for
sandhill cranes. There will be our
traditional closing banquet on the evening of the 10th. For those of you interested in this area of
Mexico, we have the possibility of a one or two
day additional field trip following the meeting.
On a more somber note, we have had word from our
colleagues in the path of Hurricane Katrina.
Through both USFWS and Scott Hereford, we have learned that the
Mississippi Sandhill Crane National Wildlife Refuge sustained some wind and
rain damage, but the main buildings are intact. Personnel are concentrating on helping authorities with the
massive destruction in the area, and have not
assessed the status of the cranes in the wild. On a more personal note, Scott Hereford, our immediate past
president of this organization, and his family evacuated to Atlanta to friends
in advance of the storm. However, Scott
says that a wall of water up to attic level rolled through their neighbor-hood,
and they expect their house to be a total loss.
Word from Megan Lauber with the
Audubon Survival Center is that they also evacuated personnel in advance of the
storm. On August 31 they were able to get a few people flown by helicopter
into the Center. They found one 5
year-old Whooping Crane (Rhett) and a 21 year-old Mississippi Sandhill Crane
(Valentine) dead and one other Mississippi Sandhill Crane missing. All other cranes and other animals at the
Center appear to have survived without problems. However, food, water and the safety of personnel are becoming
issues which may force the Center to consider evacuating their animals to other
locations in the near future. Currently
hay is being ferried in by helicopter, two bales a trip. There is no fresh running water, and animals
are drinking from water on the ground (in this area uncontaminated rain water because they are out of the city). We will try to post more information on our
web site (www.nacwg.org) as we receive
it. Needless to say, our thoughts and
prayers are with Scott and Megan and all the folks along the Gulf Coast.
Glenn H. Olsen, President
NACWG, USGS Patuxent Wildlife Research Center
|
Regional Reports |
Whooping
Crane Breeding Grounds in Wood Buffalo National Park
Whooping Crane breeding pair surveys were carried out by the
Canadian Wildlife Service (Brian Johns and Melanie Failler) between May 14 and
23. A total of 58 nests were
discovered, along with an additional 12 pairs that nested in 2004 that are not
nesting this year. A total of 72
territorial pairs were observed this year.
Several subadult or non-territorial cranes were also observed scattered
throughout the breeding area.
The 2004 year was one of drought conditions throughout the
crane nesting area. Last year the breeding
grounds received only 69% of normal precipitation resulting in many forest
fires. Up until the beginning of June
of this year the area received about 84% of normal precipitation. In spite of the lack of precipitation, the
habitat conditions were only slightly below average at nesting time.
Between June 11 and 17, 2005 the Canadian Wildlife Service
(Brian Johns) with the assistance of the United States Fish and Wildlife
Service (Tom Stehn and Jim Bredy) conducted hatching success surveys. Forty-eight nests hatched and a total of 62
young Whooping Cranes were observed.
Fourteen of the pairs each had two young (twins). Aerial photography was completed by the
USFWS (Jim Bredy and Chris Lohrengel) for new nesting areas that had been
discovered earlier by B. Johns.
The lack of rain in May (less than half of normal) resulted
in deteriorating habitat conditions.
Water levels, in particular in the Sass River nesting area were low with
many ponds being dry. The dry
conditions resulted in the forest fire hazard rating being extreme. Lightning storms passed through the area on
June 7 and 12 resulting in fires near the town of Fort Smith and in the
Whooping Crane nesting area. Fire crews
from Alberta, Northwest Territories and Wood Buffalo National Park were all
battling fires. The fire of biggest
concern was burning within 7 km of Fort Smith.
Another fire was within 400 metres of a family of cranes but was not
threatening the birds. A third fire was
threatening to shut down traffic on the only road access to Fort Smith. Water bombers and ground crews were fighting
this fire for two days before heavy rains came on June 16. This rain was the equivalent of the normal
for the entire month.
The rain was a welcome relief for the fire crews and for the
dry marshes; however rain at hatching time leads to higher mortality of the
young cranes. Pairs with two young will
often loose at least one of their young under such conditions. On June 17 after the rain had subsided we
checked seven of the “twin” pairs. Only
one family group still had both their young, five others had each lost one
young and one pair lost both their young.
On June 19 temperatures cooled and heavy rain and some snow fell
overnight. The cool temperature
combined with the heavy rain further reduced chick survival.
From August 17-19 the CWS (Brian
and Melanie) conducted fledging success surveys and discovered 31 young in 29
family units. Habitat conditions had
improved in most areas due to heavy rains during the month of July and in early
August which ended the fire season earlier than normal. The Klewi nesting area was the only region
that remained dry. As a consequence
chick production was very poor in that area.
In addition to the surveys we also recorded unison calls and checked
water gauges during the week.
Brian Johns, Canadian
Wildlife Service
Mississippi
Sandhill Crane National Wildlife Refuge
The Comprehensive Conservation Planning process, mandated for every national
wildlife refuge as part of 1997 National Wildlife Refuge Improvement Act, is
underway on the Mississippi Sandhill Crane NWR. The refuge Biological Review report was completed in June. The Visitor Services Review is also
complete.
In the 25th year of the restocking program with the 2004-2005 releases, 25
captive-reared cranes were transferred to the refuge for acclimation and
release. In October-November, 22
captive-reared juveniles in three cohorts from ACRES were transferred, banded,
radio-tagged, acclimated, and released: Firetower (8 birds) cohort , Fontainebleau
(7), and Duck Pond (7). After a
multiple mortality incident (the first ever post-release) at Duck Pond, the
lone survivor #457 was captured December 11, rebrailled and placed in the
Fontainebleau Pen for a second acclimation period. In December, two parent-reared juveniles were brought from White
Oak
Conservation Center, banded, brailled, radio-tagged and placed in Fontainebleau
Pen with 457, and debrailed in January 2005.
The January 2005 population was 140 cranes, including the recent “releasees.” Although fewer resources were available for
monitoring, 29 nests were identified from 23 pairs. For the first time since 1990, a pair laid two renests. Funds were available for full-time predator
control from
USDA APHIS Wildlife Services. In late May,
12 chicks may have been alive, the highest number recorded. Helicopter surveys in late summer should
determine survival. By late June, there
were still at least two active nests.
There have been several pertinent refuge personnel changes recently. David Zabriskie started work in May as a PFT
wildlife biologist to fill the vacancy left by Tracy Grazia last
September. The third full-time position
on the biology staff was abolished after Jereme Phillips left in 2003. Amy Croft has been doing a great job as a
temporary Biotech but funds will run out in September. Assistant Refuge Manager Tom Thornhill
retired in April; that position will not be filled anytime soon. The refuge manager position also remains
vacant. Project Leader Alan Schriver
will transfer out to a refuge in Tennessee in early August. That position will be filled.
Scott G. Hereford, U.S. Fish &
Wildlife Service, Mississippi Sandhill Crane National Wildlife Refuge
Eastern
Migratory Whooping Crane Reintroduction
Winter 2004/05.--Locations
of the HY2001-03 cohorts during winter 2004/05 included 20 birds in Florida, 4
in Tennessee, 7 in South Carolina, and 3 in North Carolina. The latter 10 birds
were all from the HY2003 cohort. The birds wintering
in North Carolina, outside the range of both other project Whooping Cranes and
the wild sandhill population, had summered in Lower Michigan during 2004.
Fall migration 2004 and subsequent
wintering were markedly different than the previous fall migration:
(1) Beginning of fall migration was
protracted with more birds leaving later, the last on 11 December.
(2) Although actual flight days
were similar, time to complete migration was generally much longer with
typically weeks spent at extended stopover sites.
(3) The migration was much more
dispersed and biased eastward, especially for yearlings on their first
unassisted fall migration.
(4) Winter homing to the Central
Gulf Coast and inland areas of west-central Florida was reduced. Most yearlings
did not demonstrate fidelity to their juvenile winter location.
The
HY2004 cohort consisted of 14 released birds (11 males and 3 females); 13
juveniles, led by Operation Migration ultralight aircraft, arrived at the
winter release pen on Chassahowitzka NWR on 12 December. Because the fall migration of older birds
was late and these latter birds had not yet passed through the saltmarsh to
winter inland, the juveniles were held in a topnetted enclosure constructed
outside a corner of the main pen. They
were allowed out of the enclosure only when costumed caretakers were present or
when no older cranes were present (some exceptions for the resident wintering
pair). This practice was continued
until 2 March, after which no older cranes other than the resident pair were at
the pensite and the juveniles were always allowed to roam freely.
Because
of flight feather development problems, one juvenile male (no. 18-04) did not
complete training necessary to follow ultralight aircraft on migration. In late October he
was released on Necedah NWR to migrate with older cranes. He followed 3 different whooping cranes
during the migration. He also spent some time alone and followed Sandhill
Cranes along the route. He
migrated successfully to Florida, where he wintered with an older Whooping
Crane in Pasco County. No. 18-04 became
the first reintroduced Whooping Crane in the eastern migratory flock to
complete his first migration by following older cranes rather than ultralight
aircraft. He migrated alone during spring migration and successfully returned
to Central Wisconsin.
Summer 2005.--With some exceptions (see
below), released Whooping Cranes generally migrated within the corridor between
Wisconsin and Florida and summered in or near the core reintroduction area in
Central Wisconsin. As in previous
years, almost all birds returned to Necedah NWR or adjacent areas at the
completion of spring migration. The
spring wandering period, most pronounced in yearlings, then began. Subsequent summer distribution reflected the
strong homing and natal site fidelity by males, while females tended to
disperse unless they were associated with males. Spring wandering in 2005 was similar to that in 2004, which was
much less than in 2003. This occurred
because there were few yearling females in the population, and most older
females were associated with males.
The
main exception to the homing pattern described above occurred in 2004 when 8
yearlings migrated too far eastward and were blocked from returning to Necedah
NWR by Lake Michigan during spring. A
group of 3 eventually circumnagivated the lake and returned to the Necedah area
in July. The remaining group of 5 summered in Lower Michigan. After migrating through southwestern Ontario
and returning to Lower Michigan in spring 2005, 2 of the 3 surviving birds of
this latter group were retrieved on 30 June 2005 and returned to join the flock
on Necedah NWR. The remaining bird was
reported in Vermont during June and New York in August. As of 13 August 2005, there are 42
individuals in the eastern migratory population. Except for the Vermont female,
all birds are in Wisconsin: 35 in the core reintroduction area in Central
Wisconsin and 6 at 4 sites in southeastern Wisconsin. Within the core area, 30 individuals are on Necedah NWR.
Survival.--Of
53 juvenile Whooping Cranes so far released in this reintroduction, there have
been 11 mortalities. These resulted
from predation (7), powerline strike (1), capture myopathy (1,
euthanized), and 2 mortalities remain under investigation and details cannot be
released. Mortalities due to predation
resulted from bobcats in southeastern U.S. (5), an undetermined predator in
Wisconsin (1), and predation in Wisconsin of a bird that was roosting on land
because of a broken leg. A protective
protocol has been effective in reducing potential bobcat predation at the
winter release site on Chassahowitzka NWR.
Breeding.--As
indicated by copulation and/or nest-building, 7 breeding pairs (6 on Necedah
NWR and 1 on adjacent Meadow Valley SWA) were apparent during spring 2005. At
least 5 of these pairs built nests, and 2 pairs each laid 1 egg. Neither egg was adequately attended by the
young, inexperienced pairs, and both eggs were shortly lost. Several other potential pairs are also
evident, and prospects are good for increased reproductive activity in 2006.
HY2005 Cohort.--As
of 13 August, 21 chicks are being reared for ultralight-led migration this
fall. These birds were hatched at
Patuxent and then transferred to Necedah NWR.
An additional 4 chicks are being reared for direct autumn release
(DAR). They were hatched at ICF and are
currently being reared on Necedah NWR.
Richard P. Urbanek, U.S. Fish and Wildlife
Service, and Lara E. A. Fondow, International Crane Foundation, on behalf of
Whooping Crane Eastern Partnership
The
Florida Non-Migratory Flock of Whooping Cranes
In 2002 the first wild “recruitment” took place in this
flock when a chick was raised up to independence by soft-released parents. The worst drought in Florida history
(1998-2001) was thought responsible for delaying the first recruitment into the
population. In 2003, two more chicks
were recruited into the population. In
2004, a single chick was recruited. In
2005, eight pairs had 11 nests but only one chick was hatched and it died at 6
days of age. For several breeding
seasons now, we have seen many nests but few eggs hatched. Examination of eggs collected from these
nests revealed that the bad eggs were either infertile or that the embryo died
at an early stage of development.
Wetland water levels have been “normal” since the end of the drought and
Florida Sandhill Cranes have been reproducing at high levels since then. So the Florida environment (water level at
least) is not likely a problem. Our
efforts in the near future will be concentrated on trying to figure out what is
going on with the poor hatching rate.
At present we routinely monitor 53 birds (14 pairs). Five sub-adults dispersed from Florida in
May and were seen 480 km north at the Ace Basin National Wildlife Refuge in
coastal South Carolina. They were only
seen there once, and since then we have not been able to track them down. Birds from this flock have dispersed
out-of-state before, mainly during the great drought when all Florida marshes
dried up.
At the latest Recovery Team Meeting (February 2005) we
reported that not only did there appear to be problems with recruitment, but
also survival of older age-classes of adults.
Hence, we recommended to the
Team that for the up-coming winter 2005-2006 “release” season, no Whooping
Cranes be released into the non-migratory flock until there was improvement in
reproduction (in the “wild”) and/or survival.
Marty Folk and Steve
Nesbitt, Florida Fish and Wildlife Conservation
Commission
The
Michigan 2004 Eastern Greater Sandhill Crane Survey
Since 1979, the U.S. Fish & Wildlife Service has
conducted a coordinated fall survey of Greater Sandhill Cranes in the eastern
United States. Counts were scheduled
during the last week in October or first week in November to ensure that cranes
were concentrated and easily counted, but early enough to avoid excessive
turnover at the Jasper-Pulaski Fish and Game Area in northern Indiana, the
largest staging area for the population.
Wildlife personnel and volunteers from Great Lakes states to Florida
have made this the best estimate of size and trends of the eastern population.
November 1, 2004, more than 30 volunteers counted 11,250
Sandhill Cranes and one Whooping Crane at 37 locations in Michigan (see
table). Baker Sanctuary, Calhoun
County, tallied the highest number 3,609 followed by 2,570 at the Haehnle
Sanctuary in Jackson County. These two
Michigan Audubon Society sanctuaries accounted for 55% of all the cranes
counted in Michigan. The Whooping Crane
seen in Barry County was originally reintroduced in Wisconsin.
The 2004 Michigan count was the highest since the survey
began in 1979. Totals steadily
increased from only 757 in 1979 to 6,807 in 1998 and then leveled off until
2001 when 8,060 were tallied. Counts
then climbed to 9,956 in 2003. During
the same period, counts of the entire eastern population increased from 14,385
sandhills in 1979 to 37,827 in 1998 (Len Schumann, pers. comm.). Since then the counts have declined. In 2004, 28,947 cranes were tallied in the
eastern population’s range (Sean Kelly, pers. comm.).
Several factors interacted to affect survey results. Much of the increase was due to expansion of
the population. Once an uncommon
species, sandhills have made a remarkable recovery in Michigan and other Great
Lakes states. As the population
increased, it appears that cranes selected additional staging areas that were
not consistently counted. As a result,
much of the fluctuation in numbers was due to incomplete surveys. Previously, counts in Michigan were
conducted only at traditional staging sites, mostly at Baker and Haehnle
Sanctuaries. The number of areas
surveyed was expanded from 14 in 2003 to 37 last year with the inclusion of
many new, previously unreported staging sites.
If only areas surveyed in 2003 were counted the total would have been
7,850 cranes in 2004 instead of 11,250, leaving little doubt that better
coverage is needed. Weather also
affects the count. When the
temperatures are mild cranes remain dispersed over a larger area and migrate
later, but an early freeze up and deep snow will concentrate the birds making
them easier to count. Conversely, it is
harder to count when inclement weather affects visibility.
The Eastern Greater Sandhill Crane Survey is another
opportunity for citizen science, much like the Christmas Bird Count, Winter
Bird Feeder Survey, etc. In an effort
to improve the accuracy of the survey, additional volunteers are needed this
year. People can help in two ways. One, they can report locations where cranes
have been seen in previous years during the last week in October or the first
week in November. Volunteers can then
follow up on these reports of new staging areas. Secondly, additional counters are needed at many of the staging
areas. The best method is to count
cranes leaving night roosts early in the morning or when they return in late
afternoon. Sometimes it is not possible
to locate night roosts, so cranes are counted when disbursed during the day in
fields. Persons interested in
cooperating in the 2005 Michigan survey can contact me for more information or
Sean Kelly for other staging areas used by the eastern population of sandhills.
For more information: Ron Hoffman, 517-769-6891, hoffmanrj@dmci.net
Sean Kelly, US F&WS, 612-713-5470, sean_kelly@fws.gov
|
Eastern Greater Sandhill Crane Survey
Results For Michigan. |
||
|
Area & Number of Sites 2003, 2004 |
11/3/03 |
11/1/04 |
|
Allegan
0, 2 |
|
386 |
|
Barry
County 0, 8 |
|
1,743 |
|
Calhoun
County 0, 1 |
|
244 |
|
Convis Twp. Baker Sanctuary 1, 1 |
5,328 |
3,609 |
|
Cass
County 0, 1 |
|
465 |
|
Clinton
County 0, 1 |
|
6 |
|
Hillsdale
County 1, 2 |
207 |
414 |
|
Jackson
County 8, 8 |
1,020 |
703 |
|
Leoni Twp. Haehnle Sanctuary 1, 1 |
2,975 |
2,570 |
|
Kalamazoo
County 0, 4 |
|
471 |
|
Livingston
County 2, 4 |
290 |
578 |
|
St.
Joseph County 0, 2 |
|
50 |
|
Washtenaw
County 2,2 |
136 |
11 |
|
Michigan
total |
9,956 |
11,250 |
|
Great
Lakes population total |
29,300 |
28,947 |
Ron Hoffman, Jackson,
Michigan
West
Coast Crane Counts
This year, the West Coast Crane Working Group (WCCWG) has focused its attention
on the Conboy Lake National Wildlife Refuge in the Glenwood Valley at the base
of Mt. Adams, Washington. The refuge
was established in 1964 to preserve the remaining wildlife habitat in the lake
bed and surrounding area for waterfowl nesting and Sandhill Cranes. The refuge is located in the only nesting
area in the state for Greater Sandhill Cranes and contains one of the state's
four populations of Oregon spotted frogs.
The 18 nesting pairs in Klickitat and Yakima counties are the only breeding
Sandhill Cranes in the state of Washington.
Sandhill Cranes are listed as endangered in Washington and there is a
need to increase the crane population to achieve de-listing.
The Sandhill Crane has been listed as an endangered species by the state of
Washington since 1981. Sandhill Cranes
are represented in Washington by about 18 pairs that breed in Klickitat and
Yakima Counties, about 23,000 sandhills that stop in eastern Washington during
migration, and 3,000-4,000 sandhills that stop on lower Columbia River
bottomlands. Up to 1,000 sandhills have
wintered on lower Columbia bottomlands in recent years, but most of the cranes
seen in Washington winter in California.
The historical distribution of breeding cranes in Washington was poorly documented,
but the few historical accounts mention breeding in south-central, northeastern
and southeastern regions, and the southern Puget Sound Basin. Crane numbers had been severely reduced due
to widespread
habitat destruction concurrent with human settlement, and perhaps more
importantly, unregulated hunting which continued until passage of the federal
Migratory Bird Treaty Act in 1916.
The species was extirpated as a breeder from the state after 1941 when the last
nest was documented at Signal Peak, Yakima County, in south-central
Washington. Some 31 years later, they
were again found summering in the Glenwood Valley on Conboy Lake National
Wildlife Refuge, Klickitat County in 1972, but it was not until 1979 that
nesting was confirmed.
A total of 18 territorial pairs was documented in 2003: 15 at Conboy Lake
National Wildlife Refuge; and one each on Yakama Indian Nation lands, Yakima
County; Panakanic Valley, Klickitat County; and on Washington Department of
Natural Resource (WDNR) lands along Deer Creek, Yakima County. The total summer population in Washington in
2003 was 49 birds. Five nests produced
chicks to fledging age in 2003.
Few studies are currently being conducted on Sandhill Cranes in the Pacific
Flyway. Joseph D. Engler, Biologist of
the USFWS, Ridgefield NWR Complex, has undertaken a study of the nesting
Sandhill Cranes in Washington State. In
2002, the WCCWG cooperated with the Washington State Department of Fish and
Wildlife in the joint funding and preparation of a recovery plan. The WCCWG is now working to implement the
recommendations of that plan.
Conboy Lake NWR, with the highest concentration of breeding Sandhill Cranes, is
endangered. There is a possibility the entire refuge will be mothballed to save
money. It would simply be locked up and
no activity would take place, public or private.
The WCCWG has arranged for speakers to address students last May at the
Glenwood School and has funded a July 2005 aerial crane count by Joe
Engler. The group is currently working
with the local communities to form a “friends” group and is circulating a grant
proposal to potential donors.
Visit our website at http://www.wccwg.nacwg.org/
Thomas J. Hoffmann,
Chair, West Coast Crane Working Group
Patuxent Wildlife Research
Center Propagation Program
Patuxent Wildlife Research Center had busy breeding and
chick rearing seasons this year. A
total of 23 fertile whooping crane eggs were laid at Patuxent. Additional fertile whooper eggs were brought
in from ICF (9), Audubon Species Survival Center (2), and the Calgary Zoo (1)
to be hatched and reared at Patuxent for the WCEP ultralight migration
project. The birds received extensive
training at Patuxent and were shipped to Necedah NWR, Wisconsin at about 40-50
days of age. Twenty-one chicks in total
were sent to Necedah. In addition, one
chick was held back for health reasons and four chicks of high genetic value
were kept to become future breeders.
Patuxent sent three fertile whooper eggs to ICF to be used in the WCEP
Direct Autumn Release project and two to the San Antonio Zoo to be raised as
captive breeders.
One whooping crane female who laid eggs for the first time
this year (Studbook #1366) has had an eventful past. She originally came to Patuxent as an egg collected from Wood
Buffalo National Park in 1995. She was
hatched and reared at Patuxent, then sent to Florida to join the non-migratory
release flock in February 1996. A few
weeks after release, the bird was unable to fly and was taken to Gainesville
for rehabilitation. After it was
determined she could not be released, she was sent to the White Oak
Conservation Center in Yulee, Florida.
She lived there for a few years, then was returned to Patuxent in early
2000 to be paired with a male determined to be her ideal genetic match. Unfortunately her ideal genetic match was
not an ideal behavioral match. She did
not produce with her first mate and so was paired with a different male in late
2004. Whooper #1366 and her new mate
produced eggs and raised a sandhill chick in their first season together. It seems she is finally home.
Jane Nicolich
Chandler, USGS Patuxent Wildlife Research Center
|
Conservation Issues |
The
Allocation of Whooping Crane Chicks (or Why My Hair is Turning Gray)
Every year, decisions have to be made about the Whooping
Crane chicks that the captive breeding centers work so hard to raise. Each chick needs a home. Here is how it is done.
The Recovery Team in 1998 prioritized the use for chicks coming from captivity. These uses are, in order from highest to lowest priority:
1.
Maintenance of captive flocks; 2.
Florida releases; 3. Wisconsin
releases; 4. Off-corridor experiments
considered essential to Florida, Wisconsin, or propagation; 5. Education; 6. Other approved populations; and 7. Other experiments.
Each
captive Whooping Crane has a mean kinship value calculated for it annually to
estimate how unique it is genetically in the captive flock. Certain pairs have few siblings and thus
there is a great need to keep their offspring in captivity to become future
breeders. These chicks we call “genetic
holdbacks.” In many cases, artificial
insemination from specific males is done to maximize the genetic value of
holdbacks. Approximately six genetically
valuable chicks are held back annually to replace birds that have died and
slowly increase the size of the captive flock to 153 birds, the number
calculated to be able to retain 90% of the flock genetics for 100 years.
Other
pairs have produced lots of offspring so are already over-represented in the
captive flocks. So their offspring are
designated for reintroduced populations.
With the Recovery Team in an assessment phase for the Florida
nonmigratory population, holding off in 2005 from putting any additional birds
in Florida, the chicks with less valuable genetics were designated this year
for the Wisconsin reintroduction. The
earliest eggs went to the ultralight project, whereas some of the eggs hatched
later were designated for the Direct Autumn Release (DAR) program (juvenile
birds released in the fall into flocks of wild Whooping Cranes in
Wisconsin). With all the initial
ultralight conditioning done at Patuxent Wildlife Research Center, this meant
some of the early eggs from other breeding centers, including Calgary Zoo, San
Antonio Zoo, Audubon Species Survival Center, and the International Crane
Foundation, were shipped to Patuxent.
Some of the later eggs at Patuxent were shipped to the San Antonio Zoo
to become captive breeders, and other eggs went to the International Crane
Foundation and added to the DAR program.
Some of the chicks designated for reintroductions developed health
problems and had to be held back in captivity.
These birds, because they have less valuable genetics, may be used at
the captive centers as imprinting models, or may be sent to zoos strictly for
display (and not for breeding) purposes.
Captive
flock managers hold weekly conference calls during the spring to make decisions
about the number and location for genetic holdbacks, and about shipping eggs
between facilities. Throw in variables
such as egg hatching dates, reintroduction project desires of having ultralight
chicks all as close in age as possible, the sex of the new hatchling making a
difference on whether the bird becomes a genetic holdback, considerations of
sex ratios and genetic diversity within each reintroduced population, space and
staffing limitations at each facility, and the biggest variable of predicting
what a given female will produce in subsequent clutches, and, believe me, chick
allocation gets a little complicated.
In
2005, the captive centers ended up producing approximately 21 chicks for the
ultralight program, five for the Direct Autumn Release, about eight genetic
holdbacks, and several birds held back with health problems. I didn’t quite tell the truth about this all
being a little complicated. It’s VERY
complicated. Only because the flock
managers and staff really know their birds and can look into their crystal
balls and make accurate forecasts about how many total chicks a female will
produce in a year, does this whole system of chick allocation work.
Tom Stehn, U.S. Whooping Crane Coordinator,
USFWS
|
News and Announcements |
THE TENTH NORTH AMERICAN CRANE WORKSHOP
Location:
Zacatecas City, Zacatecas, Mexico
Date:
February 7-10, 2006
The tentative schedule for the Tenth North American Crane Workshop is as follows:
· Ice-breaker, Tuesday, 7 February
· Paper sessions, Wednesday, 8 February and Friday, 10 February
· Callejoneada (local street event with brass band and mescal) on Wednesday evening
· All day field trip Thursday, 9 February
· Whooping Crane Recovery Team meeting, 6-7 February
The paper sessions promise to be exceptional and will
reflect the international flavor of this meeting. It is too close to the submission deadline at the time of this
writing to say exactly how many papers will be presented, but the program is
currently well filled with exciting titles.
There will also be a poster session with opportunities to meet with
authors over snacks. The following is
just a sampling of paper topics.
| The Cuban Sandhill Crane as an umbrella species |
|
| Surveillance for West Nile Virus at the International Crane Foundation 2000-2005 | |
| Crop depredations by cranes in Siberia | |
| Capture success of Whooping Cranes in Florida using the clap trap method | |
| Responses of nesting Sandhill Cranes to research activities | |
| Hunting success for mid-continent Sandhill Cranes in the Central Flyway | |
| Assessment of Whooping Crane habitat needs at White Lake, Louisiana | |
| Common Crane management in Germany | |
| Whooping Crane collisions with power lines |
|
| The Whooping Crane in Mexico |
|
| Infectious bursal disease virus in cranes | |
| Eastern Equine Encephalitis mortality in the Whooping
Crane |
|
| Status of the Whooping Crane in Florida |
|
| Sandhills and beavers | |
| Fat storage by Sandhill Cranes |
News of
Members
Gay Gomez,
Associate Professor of Geography at McNeese State University, Lake Charles,
Louisiana, was appointed by Governor Kathleen Blanco to serve on the White Lake
Property Advisory Board. The board is a
13-member state commission charged with advising the Louisiana Department of
Wildlife and Fisheries on wetland management and land use issues and on
developing an environmental education program for the White Lake Wetland Conservation
Area. This is the extensive freshwater
wetland property north of White Lake, where the Louisiana non-migratory
population of Whooping Cranes existed until 1950 and where some migratory
whoopers once wintered.
Editor’s Note: The Unison Call is a forum to share updates and opinions. Articles are not peer reviewed. Reviews and opinions included in any section of the newsletter are those of the author and do not necessarily represent the views of the NACWG.
The Unison Call is published twice yearly,
winter/spring and summer/fall.
Membership is based on a calendar year.
Contributions, suggestions, opinions, drawings, cartoons, and
photographs are welcome. Items can be
sent to:
David
and Cathy Ellis, Editors
HC
1 Box 4420
Oracle, AZ 85623
E-mail: dcelllis@theriver.com
Deadlines
are normally June 10 and December 10.
Please send information as a Microsoft Word attachment (e-mail) whenever
possible.
Crane Trivia: How many crane species are there worldwide? (Do your calculations and send your answers
to the editors. We plan to publish some
in the next Unision Call.)
Membership is based on a calendar year. A membership directory is periodically
mailed to members. Provide the contact information below that you want
printed in the directory.
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Mail completed form and check (US$ payable to NACWG) to:
NACWG
c/o Thomas J Hoffmann
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Return Address:
NORTH AMERICAN CRANE
WORKING GROUP
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Place, Suite 300
Seattle, WA 98119
Board of Directors
President: Glenn Olsen
Vice-President: Gary Krapu
Secretary: Tracy Grazia
Treasurer: Tom Hoffmann
Felipe Chavez -Ramirez
Marilyn Spalding
Richard Urbanek
The Unison Call is published semiannually by NACWG
David and Cathy
Ellis, Editors
