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Zoo Biol.: Extinction risk assessment for the species
survival plan (SSP[R]) population of the Bali mynah (Leucopsar
rothschildl).
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| Article Type: | Brief article |
| Subject: | Risk assessment (Research) |
| Authors: |
Earnhardt, J.M. Thompson, S.D. Faust L.J. |
| Pub Date: | 09/01/2009 |
| Publication: | Name: Journal of Avian Medicine and Surgery Publisher: Association of Avian Veterinarians Audience: Academic Format: Magazine/Journal Subject: Health Copyright: COPYRIGHT 2009 Association of Avian Veterinarians ISSN: 1082-6742 |
| Issue: | Date: Sept, 2009 Source Volume: 23 Source Issue: 3 |
| Topic: | Event Code: 310 Science & research |
| Product: | Product Code: 9912200 Venture Analysis |
| Geographic: | Geographic Scope: United States Geographic Code: 1USA United States |
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| Accession Number: | 252006996 |
| Full Text: |
The Bali mynah Species Survival Plan (SSP[R]), an Association of
Zoos and Aquariums program, strives to maintain the genetic and
demographic health of its population, avoid unplanned changes in size,
and minimize the risk of population extinction. The SSP population meets
current demographic and genetic objectives with a population size of 209
birds at 61 institutions and 96% genetic diversity (GD) retained from
the source population. However, participating institutions have
expressed concerns regarding space allocation, target population size
(TPS), breeding restrictions, inbreeding depression, and harvest in
relation to future population availability and viability. Based on these
factors, we assess 5 questions with a quantitative risk assessment,
specifically a population viability analysis (PVA) using ZooRisk
software. Using an individual-based stochastic model, we project
potential population changes under different conditions (eg, changes in
TPS and genetic management) to identify the most effective management
actions. Our projections indicate that under current management
conditions, population decline and extinction are unlikely and that
although GD will decline over 100 years the projected loss does not
exceed levels acceptable to population managers (less than 90% GD
retained). Model simulations indicate that the combination of 2 genetic
management strategies (ie, priority breeding based on mean kinship and
inbreeding avoidance) benefits the retention of GD and reduces the
accumulation of inbreeding. The current TPS (250) is greater than
necessary to minimize the risk of extinction for the SSP population but
any reduction in TPS must be accompanied by continued application of
genetic management. If carefully planned, birds can be harvested for
transfer to Bali for a reintroduction program without jeopardizing the
SSP population. 2009;28:230-252. |
| Gale Copyright: | Copyright 2009 Gale, Cengage Learning. All rights reserved. |