Demography of a stable population of Crab Plovers wintering in Oman

Roeland A. Bom, Jan A. van Gils, Kees Oosterbeek, Symen Deuzeman, Jimmy de Fouw, Andy Y. Kwarteng, Rosemarie Kentie

Research output: Contribution to journalArticle

Abstract

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 to 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 (7000–9000 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 listing 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.

Original languageEnglish
Pages (from-to)517-525
Number of pages9
JournalJournal of Ornithology
Volume159
Issue number2
DOIs
Publication statusPublished - Apr 1 2018

Fingerprint

Charadriidae
Oman
demography
crabs
demographic statistics
yearlings
winter
Ardeola
breeds
monitoring
birds
carrying capacity
Indian Ocean
immigration
breeding sites
fecundity

Keywords

  • Apparent survival
  • Arabian Peninsula
  • Barr Al Hikman
  • Dromas ardeola
  • Fecundity
  • Finite range of change
  • Integrated Population Model

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Bom, R. A., van Gils, J. A., Oosterbeek, K., Deuzeman, S., de Fouw, J., Kwarteng, A. Y., & Kentie, R. (2018). Demography of a stable population of Crab Plovers wintering in Oman. Journal of Ornithology, 159(2), 517-525. https://doi.org/10.1007/s10336-018-1529-0

Demography of a stable population of Crab Plovers wintering in Oman. / Bom, Roeland A.; van Gils, Jan A.; Oosterbeek, Kees; Deuzeman, Symen; de Fouw, Jimmy; Kwarteng, Andy Y.; Kentie, Rosemarie.

In: Journal of Ornithology, Vol. 159, No. 2, 01.04.2018, p. 517-525.

Research output: Contribution to journalArticle

Bom, RA, van Gils, JA, Oosterbeek, K, Deuzeman, S, de Fouw, J, Kwarteng, AY & Kentie, R 2018, 'Demography of a stable population of Crab Plovers wintering in Oman', Journal of Ornithology, vol. 159, no. 2, pp. 517-525. https://doi.org/10.1007/s10336-018-1529-0
Bom, Roeland A. ; van Gils, Jan A. ; Oosterbeek, Kees ; Deuzeman, Symen ; de Fouw, Jimmy ; Kwarteng, Andy Y. ; Kentie, Rosemarie. / Demography of a stable population of Crab Plovers wintering in Oman. In: Journal of Ornithology. 2018 ; Vol. 159, No. 2. pp. 517-525.
@article{7c3f8de4c2764a8a81c5d88671cbfadc,
title = "Demography of a stable population of Crab Plovers wintering in Oman",
abstract = "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 to 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 (7000–9000 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 listing 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.",
keywords = "Apparent survival, Arabian Peninsula, Barr Al Hikman, Dromas ardeola, Fecundity, Finite range of change, Integrated Population Model",
author = "Bom, {Roeland A.} and {van Gils}, {Jan A.} and Kees Oosterbeek and Symen Deuzeman and {de Fouw}, Jimmy and Kwarteng, {Andy Y.} and Rosemarie Kentie",
year = "2018",
month = "4",
day = "1",
doi = "10.1007/s10336-018-1529-0",
language = "English",
volume = "159",
pages = "517--525",
journal = "Journal of Ornithology",
issn = "2193-7206",
publisher = "Springer Verlag",
number = "2",

}

TY - JOUR

T1 - Demography of a stable population of Crab Plovers wintering in Oman

AU - Bom, Roeland A.

AU - van Gils, Jan A.

AU - Oosterbeek, Kees

AU - Deuzeman, Symen

AU - de Fouw, Jimmy

AU - Kwarteng, Andy Y.

AU - Kentie, Rosemarie

PY - 2018/4/1

Y1 - 2018/4/1

N2 - 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 to 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 (7000–9000 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 listing 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.

AB - 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 to 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 (7000–9000 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 listing 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.

KW - Apparent survival

KW - Arabian Peninsula

KW - Barr Al Hikman

KW - Dromas ardeola

KW - Fecundity

KW - Finite range of change

KW - Integrated Population Model

UR - http://www.scopus.com/inward/record.url?scp=85044739762&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044739762&partnerID=8YFLogxK

U2 - 10.1007/s10336-018-1529-0

DO - 10.1007/s10336-018-1529-0

M3 - Article

AN - SCOPUS:85044739762

VL - 159

SP - 517

EP - 525

JO - Journal of Ornithology

JF - Journal of Ornithology

SN - 2193-7206

IS - 2

ER -