Variations in breeding success and daily nest survival of Whiskered Tern (<Emphasis Type="Italic">Chlidonias hybrida</Emphasis>) at two Iranian colonies |
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Authors: | Ahmad Barati Asieh Aliakbari Seyed Mahmoud Ghasempouri |
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Institution: | 1.Department of Environment,Malayer University,Hamedan,Iran;2.Department of Environment, Faculty of Natural Resources and Marine Sciences,Tarbiat Modares University,Noor,Iran |
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Abstract: | Variations in breeding success of the Whiskered Terns (Chlidonias hybrida) were studied in two wetlands; Anzali (2005 and 2008) and Zarivar (2007–2008) in north and west Iran. Nesting success was
modeled and compared using information-theoretic approach implemented in program Mark in order to assess effects of colony
locations, years and nest initiation dates on the probability of daily nest survival. Clutch size did not vary between colonies
and years. Breeding success varied between colonies (Zarivar > Anzali), and years only in Anzali (2005 > 2008). Overall daily
nest survival was 0.977. (95% LCI 0.973, UCI 0.981), equivalent to a Mayfield nest survival of 0.317. (95% LCI 0.255, UCI
0.387). Egg-laying periods and colony site were important covariates affecting the daily survival rates (Σω
i
= 0.86 and Σω
i
= 0.83, respectively), while, the support for the effect of year was less (Σω
i
= 0.41). We concluded that Lake Zarivar provides a more favorable nesting location for Whiskered Terns probably because of
little changes in rainfall and water depth during the breeding seasons which influence breeding performance. |
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Keywords: | |
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