Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China
1. To successfully perform their long-distance migrations, migratory birds require sites along their migratory routes to rest and refuel. Monitoring the use of so-called stopover and staging sites provides insights into (1) the timing of migration and (2) the importance of a site for migratory bird...
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ftdryad:oai:v1.datadryad.org:10255/dryad.212559 2023-05-15T15:48:30+02:00 Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China Lok, Tamar Hassell, Chris J. Piersma, Theunis Pradel, Roger Gimenez, Olivier Australia East-Asia Holocene 2019-06-20T15:07:04Z http://hdl.handle.net/10255/dryad.212559 https://doi.org/10.5061/dryad.dq7495s unknown doi:10.5061/dryad.dq7495s/1 doi:10.5061/dryad.dq7495s/2 doi:10.1002/ece3.5139 doi:10.5061/dryad.dq7495s Lok T, Hassell CJ, Piersma T, Pradel R, Gimenez O (2019) Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China. Ecology and Evolution 9(11): 6176-6188. http://hdl.handle.net/10255/dryad.212559 heterogeneity Jolly-Seber mark-recapture migration population size red knot state-space model stopover duration Article 2019 ftdryad https://doi.org/10.5061/dryad.dq7495s https://doi.org/10.5061/dryad.dq7495s/1 https://doi.org/10.5061/dryad.dq7495s/2 https://doi.org/10.1002/ece3.5139 2020-01-01T16:26:27Z 1. To successfully perform their long-distance migrations, migratory birds require sites along their migratory routes to rest and refuel. Monitoring the use of so-called stopover and staging sites provides insights into (1) the timing of migration and (2) the importance of a site for migratory bird populations. A recently developed Bayesian superpopulation model that integrates mark-recapture data and ring density data enabled the estimation of stopover timing, duration and population size. Yet, this model did not account for heterogeneity in encounter (p) and staying (ϕ) probabilities. 2. Here we extended the integrated superpopulation model by implementing finite mixtures to account for heterogeneity in p and ϕ. We used simulations and real data on red knots Calidris canutus staging in Bohai Bay, China, during spring migration to (1) show the importance of accounting for heterogeneity in encounter and staying probabilities to get unbiased estimates of stopover timing, duration and numbers of migratory birds at staging sites and (2) get accurate stopover parameter estimates for a migratory bird species at a key staging site that is threatened by habitat destruction. 3. Our simulations confirmed that heterogeneity in p affected stopover parameter estimates more than heterogeneity in ϕ. Bias was particularly severe when most birds had both low ϕ and p. Bias was largest for population size, intermediate for stopover duration and negligible for stopover timing. 4. 50,000-100,000 red knots were estimated to annually stop for 5-9 days in Bohai Bay between 10 and 30 May. This shows the key importance of this staging site for this declining species. There were no clear changes in stopover parameters over time. 5. Our study shows the importance of accounting for heterogeneity in both encounter and staying probabilities for accurately estimating stopover duration and population size and provides an appropriate modelling framework. Article in Journal/Newspaper Calidris canutus Red Knot Dryad Digital Repository (Duke University) |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
heterogeneity Jolly-Seber mark-recapture migration population size red knot state-space model stopover duration |
spellingShingle |
heterogeneity Jolly-Seber mark-recapture migration population size red knot state-space model stopover duration Lok, Tamar Hassell, Chris J. Piersma, Theunis Pradel, Roger Gimenez, Olivier Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China |
topic_facet |
heterogeneity Jolly-Seber mark-recapture migration population size red knot state-space model stopover duration |
description |
1. To successfully perform their long-distance migrations, migratory birds require sites along their migratory routes to rest and refuel. Monitoring the use of so-called stopover and staging sites provides insights into (1) the timing of migration and (2) the importance of a site for migratory bird populations. A recently developed Bayesian superpopulation model that integrates mark-recapture data and ring density data enabled the estimation of stopover timing, duration and population size. Yet, this model did not account for heterogeneity in encounter (p) and staying (ϕ) probabilities. 2. Here we extended the integrated superpopulation model by implementing finite mixtures to account for heterogeneity in p and ϕ. We used simulations and real data on red knots Calidris canutus staging in Bohai Bay, China, during spring migration to (1) show the importance of accounting for heterogeneity in encounter and staying probabilities to get unbiased estimates of stopover timing, duration and numbers of migratory birds at staging sites and (2) get accurate stopover parameter estimates for a migratory bird species at a key staging site that is threatened by habitat destruction. 3. Our simulations confirmed that heterogeneity in p affected stopover parameter estimates more than heterogeneity in ϕ. Bias was particularly severe when most birds had both low ϕ and p. Bias was largest for population size, intermediate for stopover duration and negligible for stopover timing. 4. 50,000-100,000 red knots were estimated to annually stop for 5-9 days in Bohai Bay between 10 and 30 May. This shows the key importance of this staging site for this declining species. There were no clear changes in stopover parameters over time. 5. Our study shows the importance of accounting for heterogeneity in both encounter and staying probabilities for accurately estimating stopover duration and population size and provides an appropriate modelling framework. |
format |
Article in Journal/Newspaper |
author |
Lok, Tamar Hassell, Chris J. Piersma, Theunis Pradel, Roger Gimenez, Olivier |
author_facet |
Lok, Tamar Hassell, Chris J. Piersma, Theunis Pradel, Roger Gimenez, Olivier |
author_sort |
Lok, Tamar |
title |
Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China |
title_short |
Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China |
title_full |
Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China |
title_fullStr |
Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China |
title_full_unstemmed |
Data from: Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China |
title_sort |
data from: accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the luannan coast of bohai bay, china |
publishDate |
2019 |
url |
http://hdl.handle.net/10255/dryad.212559 https://doi.org/10.5061/dryad.dq7495s |
op_coverage |
Australia East-Asia Holocene |
genre |
Calidris canutus Red Knot |
genre_facet |
Calidris canutus Red Knot |
op_relation |
doi:10.5061/dryad.dq7495s/1 doi:10.5061/dryad.dq7495s/2 doi:10.1002/ece3.5139 doi:10.5061/dryad.dq7495s Lok T, Hassell CJ, Piersma T, Pradel R, Gimenez O (2019) Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China. Ecology and Evolution 9(11): 6176-6188. http://hdl.handle.net/10255/dryad.212559 |
op_doi |
https://doi.org/10.5061/dryad.dq7495s https://doi.org/10.5061/dryad.dq7495s/1 https://doi.org/10.5061/dryad.dq7495s/2 https://doi.org/10.1002/ece3.5139 |
_version_ |
1766383467027759104 |