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- W2136048214 abstract "A significant increase in hatching and late-incubation deaths during two breeding seasons in a captive population of endangered black stilts (kaki, Himantopus novaezelandiae) prompted an investigation into the potential role of iodine deficiency. During the 1997 and 1998 breeding seasons, the survival rate of captive-laid eggs during artificial incubation and hatching was lower than that of eggs laid by wild kaki, which were collected and incubated artificially in the same environment. Necropsy results revealed abnormalities in thyroid structure. These abnormalities had been occurring in captive birds since 1994, but they peaked in 1997 and 1998 at 30% and 81%, respectively, of all diagnosed necropsies. Necropsies of pied stilts, hybrids, and one kaki from the wild revealed no thyroid abnormalities. Gross morphological symptoms observed at hatching in chicks that died were consistent with those described for iodine deficiency in poultry. Serum levels of thyroxine (T4) were considerably higher in wild pied stilts and hybrid chicks than in captive adult, subadult, and kaki chicks. In five individuals from the captive population, serum levels increased after about 160 days of iodine supplementation and approached values in the wild. The constraints associated with working with such a critically endangered species (e.g., small sample size and an urgent need to effect changes) precluded the use of an experimental approach to determine the role iodine deficiency played in peri-hatching deaths. However, we believe the evidence presented here strongly supports a case for the impact of iodine on survival within the captive population. Our experience also highlights the need for vigilance in captive programs with respect to potential dietary deficiencies when endangered species are raised in captivity for conservation purposes. Zoo Biol 23:1–13, 2004. © 2004 Wiley-Liss, Inc." @default.
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- W2136048214 date "2004-01-01" @default.
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- W2136048214 title "Iodine deficiency affects hatchability of endangered captive kaki (Black Stilt,Himantopus novaezelandiae)" @default.
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- W2136048214 doi "https://doi.org/10.1002/zoo.10123" @default.
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