The Scientific Bases for the Preservation of the Hawaiian Crow (1992) / Chapter Skim
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6 OPTIONS FOR MANAGEMENT OF THE 'ALALA
6 OPTIONS FOR MANAGEMENT OF THE 'ALALA
Pages 79-89
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From page 79... ...
The relict population on He McCandless Ranch appears to have rem~ed relatively stable during this period. Passive management could continue to maintain the status quo as long as nasality balances mortality, or it could result in a slow increase in local numbers if nasality exceeds mortality, as In the population mode!
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From page 80... ...
Might increase risk of transmitting diseases between wild and captive birds f. Eliminates acquisition of essential information on wild birds
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From page 81... ...
Provides method to increase number and genetic diversity of captive birds e. Provides birds for enhancing or establishing wild or captive population f.
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From page 82... ...
facilities required for artificial incubation b. Increases He number and genetic diversity of captive population c.
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From page 83... ...
-~-~ ~ wide 6.1 _ A_ Dls~v~= 8. EXCBAN~ ~ Cam At ~ CAMS h1414 e genetic day offend and captive populations ltowsc~piveand wDdbUds m banged as one population Coudd id to 6~nsdoD offline v/Rd p ^ a.
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From page 84... ...
I However, He amount of genetic diversity that would be introduced into the captive population by Option 2 would depend on how distantly related the wild birds were to the captive birds, and Hose relationships are unknown.
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From page 85... ...
~nsIocation of AN Wild Birds to Another Location In the Wild O ~_ _ ~ This extreme measure has been used successfully to rescue the Chatham Island Black Robin from probable extinction in New Zealand (Reed and Merton, 19911. It has also been proposed for the 'Alala, primarily to circumvent sociopolitical problems that have hampered state and federal efforts to manage He wild crows, most or all of which now live on private land.
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From page 86... ...
It relies on the capability of most female birds to renest and lay a second or third set of eggs after removal of Me previous clutch or to continue laying eggs beyond the normal clutch size if eggs are removed in sequence as laid. Because eggs have a much higher rate of hatch In laboratory incubators if they have received several days of natural incubation, taking full clutches after 5-7 days is Me best procedure.
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From page 87... ...
If the 'Alala requires the transfer of complicated social traditions or survival techniques from parents to offspring, or if social and sexual imprinting are critical to the development of normal functions, then cross-foster~ng would be precluded as a management technique.
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From page 88... ...
Soft releases can sometimes also avoid the high mortality associated with fostering eggs or young birds. Moreover, Hey provide opportunities to acclimate and condition birds to survive and function adaptively In degraded or partially exotic habitats that unconditioned, wild birds would find difficult or impossible to live in (Cede, 1986a; Cade and [ones, in press)
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From page 89... ...
As the wild population increases over the next few years, additional manipulative procedures can be introduced -- supplemental feeding of wild pairs; translocation of nesdings, subadults, and nonbreeding adults to new territories; development. of optimum "soft-release" methods for establishing crows in a vacated range; perfection of methods to prevent disease In He wild and captive birds; and conditioning of crows to acclimate and adjust to human-modified habitats.
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