Navigation Links
Removing egg from nest may help save endangered whooping crane

Removing an egg from the endangered whooping crane's nest increases the species chances of survival despite governmental concerns about tampering with nature, says a University of Alberta scientist.

Dr. Mark Boyce, from the Faculty of Science, studied the policy of removing from Wood Buffalo National Park one of two whooping crane eggs laid and raising it in a "foster-parenting" program. Cranes usually rear a single chick and the other dies to siblicide or is killed by a predator, such as the wolf or fox. The egg-removal program was initiated years ago by Ernie Kuyt, an Edmonton-based scientist who reasoned that one egg could be taken and used for artificial propagation programs. The idea was so successful, says Boyce, that the whooping crane's numbers have skyrocketed to over 200 birds in the original population and two new populations have been established elsewhere.

But Parks Canada prefers that no future egg collections occur in Wood Buffalo National Park due to concerns that egg removals may reduce the productivity of the whooping crane population and that more generally, human intervention and disturbance should be minimized. Boyce's research found, however, that taking one egg away actually increases the probability of nest success. His paper--co-authored by Subhash Lele from the U of A's mathematical and statistical sciences department as well as Brian Johns from the Canadian Wildlife Service-- is published in the December issue of Biological Conservation.

The last remaining whooping crane population nests in Wood Buffalo National Park and winters at the Aransas National Wildlife Refuge in Texas. At one point the bird's numbers reached a low of 16 in 1942 but the population has since increased to more than 200 birds. Not only has the Wood Buffalo-Aransas population been enhanced by the egg removal program but removing the eggs has allowed the establishment of additional populations like those in Wisconsin and Florida, and a sizable c aptive flock. Taken together, the benefits to the conservation of the species have been very substantial, said Boyce.

"Luckily, at the moment the program is so successful that there is no reason to collect more eggs," said Boyce. "But for Parks Canada to intervene with a formal policy to prohibit future egg collecting is inappropriate and flies in the face of the data, as we present in our paper."

Boyce suggests several reasons why a chick might survive when an egg is removed from a nest. Sibling aggression has been so strong that some chicks have been observed pecking the later-born bird to death. Also, a pair of chicks is more likely to attract the attention of a predator and parents can be more attentive if they only have a single chick to protect.

Even though long-term fitness is almost the same whether one egg or two is laid, the risk of extinction for the Wood Buffalo-Aransas whooping crane population is lowest when eggs are removed, says Boyce. He recognizes the need to minimize human influence in national parks, but says priority should be given to ensure persistence of threatened and endangered species so that diversity is not lost permanently. "Surely we cannot appreciate benefits to ecological-process management if components of the ecosystem are missing," said Boyce.


'"/>

Source:University of Alberta


Related biology news :

1. Removing DNA repair gene causes metabolic syndrome
2. Leading scientists rank endangered dolphins, porpoises most in need of immediate action
3. Time and money make a difference in endangered species recovery
4. Costly breeding programs for endangered species pay off
5. Cattle grazing may help rather than hurt endangered species
6. Envisat radar surveillance protects endangered prehistoric fish
7. Overfishing may drive endangered seabird to rely upon lower quality food
8. Seal rookeries could provide a reliable food source for endangered California condors, study finds
9. Rare Tibetan antelope listed as endangered
10. Protecting endangered species helps reduce poverty
11. Scientist warns of threat to last stronghold of endangered turtle
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:1/20/2016)... 20, 2016 A market that just keeps ... from the explosion in genomics knowledge. Learn all about ... A range of dynamic trends are pushing market growth ... medicine - pharmacogenomics - pathogen evolution - next generation ... - greater understanding of the role of genetic material ...
(Date:1/15/2016)... SAN JUAN, Puerto Rico , Jan. 15, 2016 ... forcing companies big and small to find new ways ... data driven culture. iOS and ... their device based on biometrics, transforming it into a ... can request that users swipe their fingerprint on their ...
(Date:1/11/2016)... -- higi, the leading retail and omni-channel community engagement platform ... mobile, today announced it has closed funding of ... --> --> The ... health platform – its network of health stations, ... services and programs to retail partners and healthcare ...
Breaking Biology News(10 mins):
(Date:2/4/2016)... Feb. 4, 2016 ContraVir Pharmaceuticals, Inc. (NASDAQ: ... development and commercialization of targeted antiviral therapies, announced today ... Conference 2016, to be held February 8-9, 2016, at ... 2016 Disruptive Growth & Healthcare Conference, taking place in ... 2016. James Sapirstein , Chief Executive Officer ...
(Date:2/4/2016)... , Feb. 4, 2016 Sinovac Biotech Ltd. ... leading provider of biopharmaceutical products in China ... its board of directors received on February 4, 2016 ... from a consortium comprised of PKU V-Ming ( ... Co., Ltd., CICC Qianhai Development ( Shenzhen ...
(Date:2/4/2016)... Strasbourg, France , to the US ... Strasbourg, France , to the US company Advanced Bioscience ... announce that it acted as an advisor to Transgene on ... Strasbourg, France , to the US company Advanced Bioscience ... Transgene (Euronext: TNG), a member of Institut Mérieux, is ...
(Date:2/3/2016)... SAN DIEGO , Feb. 3, 2016 /PRNewswire/ ... medicine company with the first pluripotent stem cell-derived ... 1 diabetes in clinical-stage development, today announced that ... Janssen Pharmaceutical Companies of Johnson & Johnson, have ... BetaLogics group into ViaCyte.  The agreement provides ViaCyte ...
Breaking Biology Technology: