The Scientific Bases for the Preservation of the Hawaiian Crow (1992) / Chapter Skim
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EXECUTIVE SUMMARY
EXECUTIVE SUMMARY
Pages 1-9
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From page 1... ...
~ I- V~lll~ ~ 1~U~ Ut ~lCllUllU YOU con=wanon auennon. As long as the 'Alala exists in the wild, it can help researchers to identify facets of the systemic problems at the ecosystem level, and perhaps provide insight on how managers can remedy them and prevent additional extinctions on He Kona slopes.
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From page 2... ...
On the McCandless Ranch, the 'Alala continued to produce fledglings at rates somewhat lower than those of temperate corvids, and fledging rates might even have been slightly lower elsewhere on He Kona coast. Juvenile (0-!
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From page 3... ...
~ ~ ^~r~ PEA ...:11 Em_. 1~L ~ ~l~a~,c&~E,~lil~llt we ~ =1U WllU In, a new Shoved ten or advisor wowing group for the 'Alala should be established that includes state and federal biologists; other professional biologists who are experts in avian ecology, captive propagation, reintroductions long-term population biology of birds, and population genetics; an avian veterinary pathologist; an avicultunst; and a representative of the private sector, preferably a private landowner or land manager.
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From page 4... ...
Those data will provide specific direction for management of the property Cat supports the final wild population as 'Alala numbers increase and of additional forest preserves after reintroduction or recolonization. Short-term measures that can be started immediately include improved forest management, control of predators, supplementation of the 'Alala's food supply, study of disease in introduced species of birds that are living in the same habitat, and a public-education program.
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From page 5... ...
Both short- and longterm actions are recommended. Some actions that can be instituted immediately are re-mating birds that have been paired unsuccessfully for more than 2 years, modifying enclosures to facilitate capture of and removal of males after the first egg of each clutch is laid, allowing females to incubate eggs 5-7 days before removal for artificial incubation, monitoring daily food intakes to assess dietary components and overall nutrition, and feeding He birds a more fnlgivorous, low-acid, low-iron diet.
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From page 6... ...
The 'Alala population on He McCandless Ranch is so close to the wild sources of some of the captive birds, however, He addition of wild adult birds from the ranch to the captive population for genetic reasons alone would be expected to provide no more Can a very minor measure of new genetic variation to the captive population, and their removal from He wild would adversely impact on the extant wild population's potential productivity. Any potential beneficial genetic augmentation of the captive flock should be accomplished by removing eggs from the wild and hatching them in captivity.
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From page 7... ...
We give the egg-removal option a high priority because it allows for simultaneous augmentation of the captive and wild populations without removing adult birds from the wild or seriously compromising the wild population's social organization or productivity. The use of egg removal and later reintroduction of young into the wild is obviously a long-term strategy and requires an active recovery team and optimum incubation and chick-rearing facilities on or near the McCandless Ranch.
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From page 8... ...
Many recovery programs have enhanced the fecundity or survivorship of wild birds considerably through the judicious application of predator control, supplemental feeding, and multiple clutching. There are now several cases in which the geographic range of an endangered species that had been reduced to single, relict population has been expanded geographically through deliberate releases into suitable habitat.
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From page 9... ...
~ summit on Me basis of We success of some em 10 ~S~ 0~ -= =~, Me I__ into in sit ad dis~udon ~ be despond ad item.
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