Funding provided by: Vogelbescherming Nederland
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100018722
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Funding provided by: Jaap van Duijn Vogelfonds*
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Funding provided by: Stichting Betty Wiegman fonds*
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Funding provided by: Dutch Centre for Field Ornithology*
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Europe's highest densities of breeding Mallards (Anas platyrhynchos) are found in the Netherlands, but the breeding population there has declined by ~30% since the 1990s. The exact cause of this decline has remained unclear.\u00a0Here, we used an integrated population model to jointly analyze Mallard population survey, nest survey, duckling survival and band-recovery data.\u00a0We used this approach to holistically estimate all relevant vital rates, including duckling survival rates for years for which no explicit data were available.\u00a0Mean vital rate estimates were high for nest success (0.38 \u00b10.01) and egg hatch rate (0.96 \u00b10.001), but relatively low for clutch size (8.2 \u00b10.05) compared to populations in other regions. Estimates for duckling survival rate for the three years for which explicit data were available were low (0.16-0.27) compared to historical observations, but were comparable to rates reported for other regions with declining populations. Finally, mean survival rate was low for ducklings (0.18 \u00b10.02), but high and stable for adults (0.71 \u00b10.03).\u00a0Population growth rate was only affected by variation in duckling survival, but since this is a predominantly latent state variable, this result should be interpreted with caution. However, it does strongly indicate that none of the other vital rates, all of which were supported by data, was able to sufficiently explain the population decline.\u00a0Together with a comparison with historic vital rates, these findings point to a reduced duckling survival rate as the likely cause of the decline. Candidate drivers of reduced duckling survival are increased predation pressure and reduced food availability, but this requires future study. Integrated population modeling can provide valuable insights into population dynamics even when empirical data for a key parameter are partly missing.
", "publication_date": "2022-05-10", "publisher": "Zenodo", "related_identifiers": [ { "identifier": "10.5281/zenodo.6517455", "relation_type": { "id": "isderivedfrom", "title": { "de": "Wird abgeleitet von", "en": "Is derived from" } }, "scheme": "doi" }, { "identifier": "10.5281/zenodo.6517457", "relation_type": { "id": "issourceof", "title": { "de": "Ist Quelle von", "en": "Is source of" } }, "scheme": "doi" } ], "resource_type": { "id": "dataset", "title": { "de": "Datensatz", "en": "Dataset" } }, "rights": [ { "description": { "en": "CC0 waives copyright interest in a work you've created and dedicates it to the world-wide public domain. Use CC0 to opt out of copyright entirely and ensure your work has the widest reach." }, "icon": "cc-cc0-icon", "id": "cc0-1.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/publicdomain/zero/1.0/legalcode" }, "title": { "en": "Creative Commons Zero v1.0 Universal" } } ], "subjects": [ { "subject": "Bayesian" }, { "subject": "citizen science" }, { "subject": "dabbling ducks" }, { "subject": "Avian demography" }, { "subject": "vital rates" }, { "subject": "Anas platyrhynchos" }, { "subject": "integrated population model" }, { "subject": "band recovery" } ], "title": "Integrated population model for the Mallard in the Netherlands" }, "parent": { "access": { "owned_by": { "user": "90070" } }, "communities": { "default": "734b6452-1f40-4db0-b218-08ab1d568b7f", "entries": [ { "access": { "member_policy": "open", "members_visibility": "public", "record_submission_policy": "open", "review_policy": "open", "visibility": "public" }, "children": { "allow": false }, "created": "2020-02-04T14:03:17.992421+00:00", "custom_fields": {}, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "734b6452-1f40-4db0-b218-08ab1d568b7f", "links": {}, "metadata": { "curation_policy": "The Dryad collection in Zenodo contains datasets mirrored from the Dryad Digital Repository. If you want your dataset to appear here, submit it through https://datadryad.org. No other datasets will be accepted.
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