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24 results on '"Nienhuis, Jeroen"'

4. Interchange of individuals between two Whooper Swan Cygnus cygnus populations, and its effect on population size estimates

Author

Brides, Kane, primary, Thorstensen, Sverrir, additional, Einarsson, Ólafur, additional, Boiko, Dmitrijs, additional, Petersen, Ævar, additional, Auhage, Svenja N.V., additional, McElwaine, Graham, additional, Degen, Axel, additional, Laubek, Bjarke, additional, Andersen-Harild, Pelle, additional, Helberg, Morten, additional, Vangeluwe, Didier, additional, Nienhuis, Jeroen, additional, Wieloch, Maria, additional, Luigujõe, Leho, additional, Morkūnas, Julius, additional, Bogomolova, Yulia, additional, Bogdanovich, Ivan, additional, Petrek, Scott W., additional, Wood, Kevin A., additional, and Rees, Eileen C., additional

Published
2023
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5. Jaarverslag Broedseizoen 2021: Nestkast: Landelijk NEtwerk voor STudies aan nestKASTbroeders

Author

Ballering, Leo, Beskers, Ronald, Bouwmeester, Henri, van der Jeugd, H.P., Van Turnhout, Chris A.M., Goffin, Bernice, Nienhuis, Jeroen, Majoor, Frank A, Vernooij, A.V.M., Visser, M.E., Ballering, Leo, Beskers, Ronald, Bouwmeester, Henri, van der Jeugd, H.P., Van Turnhout, Chris A.M., Goffin, Bernice, Nienhuis, Jeroen, Majoor, Frank A, Vernooij, A.V.M., and Visser, M.E.

Published
2022

7. Monitoring van het voor vogels oogstbare voedselaanbod in de kombergingen van het Pinkegat en Zoutkamperlaag : rapportage t/m monitoringjaar 2020

Author

Ens, Bruno J., Troost, Karin, van Winden, Erik, Schekkerman, Hans, Rappoldt, Kees, van Kessel, Jos, and Nienhuis, Jeroen

Subjects
monitoring, feeding behaviour, akkervogels, voedingsgedrag, Haematopus ostralegus, Business Manager projecten Midden-Noord, availability, Numenius, farmland birds, Tringa totanus, Calidris alpina, beschikbaarheid, Business Manager projects Mid-North
Published
2021

8. Conceptualizing and quantifying body condition using structural equation modelling: A user guide

Author

Frauendorf, Magali, Allen, A.M., Verhulst, Simon, Jongejans, Eelke, Ens, Bruno J., Der Kolk, Henk-Jan van, de Kroon, H., Nienhuis, Jeroen, Pol, Martijn van de, Frauendorf, Magali, Allen, A.M., Verhulst, Simon, Jongejans, Eelke, Ens, Bruno J., Der Kolk, Henk-Jan van, de Kroon, H., Nienhuis, Jeroen, and Pol, Martijn van de

Abstract

Item does not contain fulltext

Published
2021

9. Jaarverslag Broedseizoen 2020: Nestkast: Landelijk NEtwerk voor STudies aan nestKASTbroeders

Author

Ballering, Leo, Beskers, Ronald, Bouwmeester, Henri, van der Jeugd, H.P., Van Turnhout, Chris A.M., Goffin, Bernice, Nienhuis, Jeroen, Majoor, Frank A, Vernooij, A.V.M., Visser, M.E., Ballering, Leo, Beskers, Ronald, Bouwmeester, Henri, van der Jeugd, H.P., Van Turnhout, Chris A.M., Goffin, Bernice, Nienhuis, Jeroen, Majoor, Frank A, Vernooij, A.V.M., and Visser, M.E.

Published
2021

10. Interchange of individuals between two Whooper Swan Cygnus cygnus populations, and its effect on population size estimates.

Author

Brides, Kane, Thorstensen, Sverrir, Einarsson, Ólafur, Boiko, Dmitrijs, Petersen, Ævar, Auhage, Svenja N.V., McElwaine, Graham, Degen, Axel, Laubek, Bjarke, Andersen-Harild, Pelle, Helberg, Morten, Vangeluwe, Didier, Nienhuis, Jeroen, Wieloch, Maria, Luigujõe, Leho, Morkūnas, Julius, Bogomolova, Yulia, Bogdanovich, Ivan, Petrek, Scott W., and Wood, Kevin A.

Subjects
SWANS, POPULATION transfers, BANKING industry, DATA recovery, CENSUS
Abstract

This study aims to determine the level of movement of individuals between the Icelandic and Northwest Mainland European (NWME) Whooper Swan Cygnus cygnus populations, and to assess the extent to which this interchange affects total population estimates. Ringing, resighting and recovery data for Whooper Swans ringed across Europe since the early 1900s were compiled from the EURING Data Bank, national ringing schemes and individual ringers. Birds were assigned to the biogeographical population (Icelandic or NWME) in which they were ringed. Of >18 000 Whooper Swans ringed in 17 European countries, 172 individuals (0.94%) were later found outside the nominal range of their assigned biogeographical population. The proportion of ringed swans from the Icelandic population that were subsequently found 'out of range' did not differ significantly from the proportion recorded for the NWME population, indicating no directional bias in population interchange. Population switching by Whooper Swans in western Europe occurs consistently, but currently at very low levels. Our results reinforce the view that such levels of population interchange are unlikely to have caused major inaccuracies or biases in the total numbers recorded during the coordinated censuses used to estimate population size. [ABSTRACT FROM AUTHOR]

Published
2022
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13. Interchange of individuals between two Whooper Swan Cygnus cygnuspopulations, and its effect on population size estimates

Author

Brides, Kane, Thorstensen, Sverrir, Einarsson, Ólafur, Boiko, Dmitrijs, Petersen, Ævar, Auhage, Svenja N.V., McElwaine, Graham, Degen, Axel, Laubek, Bjarke, Andersen-Harild, Pelle, Helberg, Morten, Vangeluwe, Didier, Nienhuis, Jeroen, Wieloch, Maria, Luigujõe, Leho, Morkūnas, Julius, Bogomolova, Yulia, Bogdanovich, Ivan, Petrek, Scott W., Wood, Kevin A., and Rees, Eileen C.

Abstract

ABSTRACTThis study aims to determine the level of movement of individuals between the Icelandic and Northwest Mainland European (NWME) Whooper Swan Cygnus cygnuspopulations, and to assess the extent to which this interchange affects total population estimates. Ringing, resighting and recovery data for Whooper Swans ringed across Europe since the early 1900s were compiled from the EURING Data Bank, national ringing schemes and individual ringers. Birds were assigned to the biogeographical population (Icelandic or NWME) in which they were ringed. Of >18 000 Whooper Swans ringed in 17 European countries, 172 individuals (0.94%) were later found outside the nominal range of their assigned biogeographical population. The proportion of ringed swans from the Icelandic population that were subsequently found ‘out of range’ did not differ significantly from the proportion recorded for the NWME population, indicating no directional bias in population interchange. Population switching by Whooper Swans in western Europe occurs consistently, but currently at very low levels. Our results reinforce the view that such levels of population interchange are unlikely to have caused major inaccuracies or biases in the total numbers recorded during the coordinated censuses used to estimate population size.

Published
2022
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15. Colour-ring wear and loss effects in citizen science mark-resighting studies

Author

Allen, A.M., Ens, Bruno J., Pol, Martijn van de, Jeugd, H. van der, Frauendorf, Magali, Kolk, Henk-Jan van der, Nienhuis, Jeroen, Jongejans, Eelke, Allen, A.M., Ens, Bruno J., Pol, Martijn van de, Jeugd, H. van der, Frauendorf, Magali, Kolk, Henk-Jan van der, Nienhuis, Jeroen, and Jongejans, Eelke

Abstract

Contains fulltext : 203308.pdf (publisher's version ) (Open Access)

Published
2019

17. Broedsucces van kustbroedvogels in de Waddenzee in 2017

Author

Koffijberg, Kees, Cremer, J.S.M., de Boer, Peter, Nienhuis, Jeroen, Oosterbeek, Kees, and Postma, Jelle

Subjects
Onderzoeksformatie, Life Science
Abstract

Data have been collected on the breeding success of several characteristic coastal breeding birds in the Wadden Sea each year since 2005. Ten birds species considered representative of specific habitats and food groups are being monitored. The monitoring scheme on breeding success in coastal breeding birds is run as an ‘early warning system’ to follow the reproductive capacity of the bird populations in the Wadden Sea and understand the processes underlying fluctuations in populations. It is a valuable addition to the monitoring of population numbers and is carried out under a trilateral agreement with Germany and Denmark (TMAP). The data are also included in the OSPAR biodiversity indicator B3 under the Marine Strategy Framework Directive. The 2017 results indicate that there has been little improvement in breeding success compared with previous years and that most species, especially Eurasian Oystercatcher, Pied Avocet and Arctic Tern, raised far too few young to maintain a stable population. Sinds 2005 worden in de Waddenzee jaarlijks gegevens verzameld over het broedsucces van een aantal karakteristieke kustbroedvogels. Tien vogelsoorten worden gevolgd die representatief worden geacht voor specifieke habitats en voedselgroepen. Het reproductiemeetnet kustbroedvogels wordt uitgevoerd als een ‘early warning systeem’ om het reproducerend vermogen van de vogelpopulaties in de Waddenzee te volgen en de achterliggende processen van populatieveranderingen te doorgronden. Het fungeert als een belangrijke aanvulling op de monitoring van aantallen en aantalsveranderingen en wordt uitgevoerd in het kader van trilaterale afspraken met Duitsland en Denemarken (TMAP). Tevens worden de gegevens opgenomen in de biodiversiteitsindicator B3 van OSPAR, t.b.v. de Kaderrichtlijn Marien. Uit de resultaten van 2017 blijkt dat er ten opzichte van de voorgaande jaren weinig verbetering in het broedsucces is opgetreden, en de meeste soorten, Scholekster, Kluut en Noordse Stern voorop, veel te weinig jongen grootbrengen om een stabiele populatie te waarborgen.

Published
2018

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