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Nest Desertion in a Reintroduced Population of Migratory Whooping Cranes

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Nest Desertion in a Reintroduced Population of Migratory Whooping Cranes PROCEEDINGS OF THE NORTH AMERICAN CRANE WORKSHOP ______________________________________________________________________________ 2010 NEST DESERTION IN A REINTRODUCED POPULATION OF MIGRATORY WHOOPING CRANES Richard P. Urbanek Sara E. Zimorski Anna M. Fasoli Eva K. Szyszkoski ______________________________________________________________________________ Urbanek, R. P., S. E. Zimorski, A. M. Fasoli, and E. K. Szyszkoski. 2010. Nest desertion in a reintroduced population of migratory whooping cranes. Proceedings of the North American Crane Workshop 11:133-141. ______________________________________________________________________________ The North American Crane Working Group provides free and open access to articles in Proceedings of the North American Crane Workshop. No additional permission is required for unrestricted use, distribution, or reproduction in any medium, provided that the original work here is properly cited. Visit http://www.nacwg.org to download individual articles or to download or purchase complete Proceedings. © 2010 North American Crane Working Group NEST DESERTION IN A REINTRODUCED POPULATION OF MIGRATORY WHOOPING CRANES RICHARD P. URBANEK,1 U.S. Fish and Wildlife Service, Necedah National Wildlife Refuge, W7996 20th Street West, Necedah, WI 54646, USA SARA E. ZIMORSKI, International Crane Foundation, E-11376 Shady Lane Road, Baraboo, WI 53913, USA ANNA M. FASOLI,2 International Crane Foundation, E-11376 Shady Lane Road, Baraboo, WI 53913, USA EVA K. SZYSZKOSKI, International Crane Foundation, E-11376 Shady Lane Road, Baraboo, WI 53913, USA Abstract: Reintroduction of an eastern migratory population of whooping cranes (Grus americana) into eastern North America began in 2001. Reproduction first occurred in 2005. Through 2008, eggs were produced in 22 first nests and 2 renests. All first nests failed–50% confirmed due to desertion by the parents and the remaining nest failures also consistent with the pattern of parental desertion. Nest failures were not related to stage of incubation, and they were often synchronous. Temperatures in winter and early spring affected timing of nest failure. An environmental factor such as harassment of incubating cranes by black flies (Simulium spp.) may be responsible for widespread nest desertion. PROCEEDINGS OF THE NORTH AMERICAN CRANE WORKSHOP 11:133-141 Key words: black flies, Grus americana, incubation, nest desertion, reintroduction, reproduction, Simulium, whooping crane, Wisconsin. The whooping crane (Grus americana) is a have been adequate to make establishment of a federally-listed, critically endangered species. The only population possible. Likewise, reproductive behavior has currently viable population consists of a naturally progressed with almost all females in the core occurring remnant flock that breeds in Wood Buffalo reintroduction area pairing, occupying established National Park, Northwest Territories, Canada, and territories, and egg laying as appropriate for their age winters on Aransas National Wildlife Refuge (NWR), (Urbanek et al. 2010a, 2010b; R. Urbanek, unpublished Texas. Recovery of the species depends on data; WCEP annual reports 2007-08). However, establishment of additional flocks separate from this reproductive failure due to nest desertion has appeared as existing population. Reintroductions begun in the an unanticipated threat to success of the reintroduction. Rocky Mountains in 1975 (migratory) and central This paper describes this problem during 2005-08. Florida in 1993 (non-migratory) have been unsuccessful. In 1998, after considering factors STUDY AREAS including avoiding the Central Flyway and range of the existing natural population, limited interest elsewhere The core reintroduction area consists of a large in Canada, identification of potential wintering areas in shallow wetland complex in central Wisconsin the eastern U.S., migration routes of sandhill crane (Urbanek et al. 2010b). All breeding territories were populations, and logistics of reintroduction, the U.S.- located within this area, mainly on Necedah NWR Canadian Whooping Crane Recovery Team (WCRT) (44°04'N, 90°10'W). Ultralight-training and release recommended Wisconsin as the next reintroduction sites were on Necedah NWR. Summer, migration, and area. The WCRT selected central Wisconsin, with wintering areas used by the population have been efforts focused on Necedah NWR, as the specific previously described (Urbanek et al. 2005b, 2010a). reintroduction site in the following year. The Whooping Crane Eastern Partnership (WCEP) METHODS began reintroduction of this eastern migratory flock of whooping cranes in 2001. Resulting survival, migration, General project methodology has been previously and human avoidance behavior of reintroduced cranes described (Urbanek et al. 2005a, 2010a, 2010b). Cranes were costume/isolation-reared (Horwich 1989, Urbanek and Bookhout 1992a) as juveniles in 2001-05 1 E-mail: [email protected] and led by ultralight aircraft (Lishman et al. 1997, Duff 2 Present address: 731 Station Road, Nanty Glo, PA 15943, USA et al. 2001, Ellis et al. 2003) on their first autumn 133 134 NEST DESERTION BY REINTRODUCED WHOOPING CRANES • Urbanek et al. Proc. North Am. Crane Workshop 11:2010 migration from Necedah NWR, central Wisconsin, to initiation was indicated by observation of only 1 crane, Chassahowitzka NWR, central Gulf Coast of Florida. e.g., foraging, when earlier both members of the pair After spending their first winter at a protected release had been present. In all instances in which existence of site where they could move freely from a large, open- a nest was predicted by this method, a nest was later topped pen (Urbanek 2010a), the cranes made the confirmed by other methods or by direct examination subsequent spring migrations on their own. after abandonment. Because whooping and other In this paper “first nest” refers to the first nest cranes spend very little time off their nests during containing eggs of each pair in each year; “renest” incubation (Allen 1952:182, Walkinshaw 1965), radio refers to any subsequent nest containing eggs. Nest signals or sightings of both cranes away from the nest “failure” indicates that no chicks hatched from the for more than 2 hours indicated nest failure or a serious subject nest. Nest “desertion” refers to a specific type disturbance problem at the nest. of nest failure caused by both adults leaving the nest We placed collected viable eggs in a portable unattended. incubator and transported them to the International We monitored breeding pairs and nest activity daily Crane Foundation, Baraboo, Wisconsin, for continued during each year (2005-08) by standard tracking incubation. They were next transferred to USGS methods including VHF telemetry with scanner Patuxent Wildlife Research Center, Laurel, Maryland, receivers (Advanced Telemetry Systems, Isanti, MN; to provide additional chicks for reintroduction. Egg Telonics, Mesa, AZ) and, where possible, direct visual manipulations have previously been used as a observation. We tracked cranes mainly from vehicles management tool at Wood Buffalo National Park (Kuyt on the ground and supplemented with aerial surveys 1996). In 2008, in an effort to investigate egg from Cessna aircraft. Each ground tracking vehicle was manipulations as a management tool to promote equipped with a through-the-roof, 7-element yagi hatching, we replaced artificial eggs with a viable egg antenna (Cushcraft Corporation, Manchester, NH). We in 1 nest. conducted time-lapse daylight videotape recording at 2 We used pooled t-tests to compare differences in first nests and 1 renest in 2007 and at 3 first nests in incubation length between the nesting season following 2008. Distance from camera to nest varied from 150 to a cold winter (2008) and nesting seasons of earlier 450 m. (warmer winter) years as well as temperature We positioned cameras on the tops of 3-m-high differences between days of successful incubation and poles set along roads or dikes where birds were nest failure. We used multinomial chi-square tests to accustomed to viewing limited refuge traffic. We used determine if nest failure was associated with stage of a vehicle or topographic relief to block visibility of incubation as well as describe temporal distribution of activity related to servicing the recording equipment. nest failures. In the former test, nests for which No cranes ever rose from a nest or exhibited any other initiation or termination of incubation was not known significant disturbance as a result of these activities. within 1 day were not included in analysis. In the latter To avoid disturbance of incubating pairs, we did not test, the first certain date of incubation was used as approach attended nests during the course of study. The initiation of incubation; if termination of incubation only 2 exceptions to this protocol were to switch an egg occurred during a range of 2 possible days, the second (later found to be infertile) of a renesting sibling pair date was used. Nests without known termination dates with a viable egg from captivity and to switch an within specific 5-day intervals during the incubation artificial egg with a viable egg recovered from the period were omitted. As above, it was assumed that a previously deserted nest. Beginning in 2006, we nest found with an intact egg had been deserted within collected deserted eggs, within 2-6 hours when the preceding 2 days. possible, and replaced them with wooden (2006-07) or plaster-filled (2007-08) artificial eggs. RESULTS We were able
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