Birds Observation and Nest Count of Crab Plover &lt;i&gt;Dromas ardeola&lt;/i&gt;, Western Reef Heron &lt;i&gt;Egretta gularis&lt;/i&gt; and four Tern species on Ghaber Nakhoda Island (Persian Gulf) in 2003 and 2012

Behrouzi-Rad, Behrouz

doi:10.5376/ijms.2013.03.0042

Cited by 2 publications

(2 citation statements)

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“…Our results support the current IUCN listing of the world population of Crab Plover as stable (IUCN 2017). Stability may be unexpected given that the species is under human pressure in their wintering grounds and especially in their breeding grounds where colonies remain subject to egg-collecting and harvest of chick and adults (De Marchi et al 2006;Behrouzi-Rad 2013;Tayefeh et al 2013). We emphasize that survival and fecundity estimates indicate that the population of Crab Plovers wintering at Barr Al Hikman received immigrants, but their origin remains speculative.…”

Section: Resultsmentioning

confidence: 91%

“…Potentially, as Crab Plovers require specific breeding-and wintering habitat, they may suffer from rapid environmental changes in coastal areas. Egg collecting, destruction of burrows, or harvesting of adults may seriously affect breeding success and survival of Crab Plovers at the breeding areas (De Marchi et al 2006;Behrouzi-Rad 2013;Tayefeh et al 2013), whereas habitat destruction and overexploitation of preferred crab prey may affect the species at the wintering areas (Safaie et al, 2013). Based on counts at the wintering areas, the world population of Crab Plovers has been estimated to be 60,000 to 80,000 birds (Wetlands International 2002).…”

Section: Introductionmentioning

confidence: 99%

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Demography of a stable population of Crab Plovers wintering in Oman

et al. 2018

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The monotypic Crab Plover Dromas ardeola winters around the shores of the Indian Ocean and breeds in colonies on islands around the Arabian Peninsula. The IUCN lists the world population of Crab Plovers as stable, but long-term survey data or demographic estimates regarding the species status are lacking. Here, we use survey and demographic data collected from 2011-2015 to study the status of the population of Crab Plover at their most important wintering area: the Barr Al Hikman Peninsula in the Sultanate of Oman. Our survey data showed that the population of Crab Plovers initially increased and then stabilized. The overall observed finite rate of population change (λ ̅ obs) was estimated at 1.004 (0.995-1.013 95% Bayesian credible interval [BCI]), indicating a stable population (7,000-9,000 birds), that is possibly at carrying capacity. Based on mark-recapture data, the mean annual apparent survival probability of Crab Plovers was estimated to be 0.90 (0.85-0.94 95% BCI). We used counts of adults and yearlings to estimate the mean annual fecundity rate at 0.06 young per pair. Using these demographic values, the overall mean expected finite rate of population change (λ ̅ exp) was estimated to be 0.949 (0.899-0.996 95% BCI), so there is a low chance that λ ̅ obs and λ ̅ exp overlap. λ ̅ obs and λ ̅ exp would completely match if about 450 Crab Plovers immigrate to Barr Al Hikman each year. Regional surveys show that yearling densities are higher closer to the breeding areas, so immigrants could be birds that during their first winter stayed close to their natal area. Our study support the IUCN listening of Crab Plover as stable, but further population-wide monitoring is required. From a conservation point of view it is important to continue monitoring because Crab Plovers breed and winter in a region that is rapidly developing.

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Section: Resultsmentioning

confidence: 91%