Aarhus University Seal / Aarhus Universitets segl

Karsten Laursen

Signals from the Wadden sea: Population declines dominate among waterbirds depending on intertidal mudflats

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Standard

Signals from the Wadden sea : Population declines dominate among waterbirds depending on intertidal mudflats. / van Roomen, M.; Laursen, K.; van Turnhout, C.; van Winden, E.; Blew, J.; Eskildsen, K.; Günther, K.; Hälterlein, B.; Kleefstra, R.; Potel, P.; Schrader, S.; Luerssen, G.; Ens, B.J.

In: Ocean & Coastal Management, Vol. 68, 2012, p. 79-88.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

van Roomen, M, Laursen, K, van Turnhout, C, van Winden, E, Blew, J, Eskildsen, K, Günther, K, Hälterlein, B, Kleefstra, R, Potel, P, Schrader, S, Luerssen, G & Ens, BJ 2012, 'Signals from the Wadden sea: Population declines dominate among waterbirds depending on intertidal mudflats', Ocean & Coastal Management, vol. 68, pp. 79-88. https://doi.org/10.1016/j.ocecoaman.2012.04.004

APA

van Roomen, M., Laursen, K., van Turnhout, C., van Winden, E., Blew, J., Eskildsen, K., Günther, K., Hälterlein, B., Kleefstra, R., Potel, P., Schrader, S., Luerssen, G., & Ens, B. J. (2012). Signals from the Wadden sea: Population declines dominate among waterbirds depending on intertidal mudflats. Ocean & Coastal Management, 68, 79-88. https://doi.org/10.1016/j.ocecoaman.2012.04.004

CBE

van Roomen M, Laursen K, van Turnhout C, van Winden E, Blew J, Eskildsen K, Günther K, Hälterlein B, Kleefstra R, Potel P, Schrader S, Luerssen G, Ens BJ. 2012. Signals from the Wadden sea: Population declines dominate among waterbirds depending on intertidal mudflats. Ocean & Coastal Management. 68:79-88. https://doi.org/10.1016/j.ocecoaman.2012.04.004

MLA

Vancouver

van Roomen M, Laursen K, van Turnhout C, van Winden E, Blew J, Eskildsen K et al. Signals from the Wadden sea: Population declines dominate among waterbirds depending on intertidal mudflats. Ocean & Coastal Management. 2012;68:79-88. https://doi.org/10.1016/j.ocecoaman.2012.04.004

Author

van Roomen, M. ; Laursen, K. ; van Turnhout, C. ; van Winden, E. ; Blew, J. ; Eskildsen, K. ; Günther, K. ; Hälterlein, B. ; Kleefstra, R. ; Potel, P. ; Schrader, S. ; Luerssen, G. ; Ens, B.J. / Signals from the Wadden sea : Population declines dominate among waterbirds depending on intertidal mudflats. In: Ocean & Coastal Management. 2012 ; Vol. 68. pp. 79-88.

Bibtex

@article{634f2e77c781477c8d734bf7f9d80fbb,
title = "Signals from the Wadden sea: Population declines dominate among waterbirds depending on intertidal mudflats",
abstract = "The Wadden Sea, shared by Denmark, Germany and the Netherlands, is one of the world's largest intertidal wetlands. Waterbirds are an important element of the Wadden Sea ecosystem. By their migratory behaviour they connect the Wadden Sea with other sites, ranging from the arctic to the western seaboards of Europe and Africa, forming the East-Atlantic Flyway. The Joint Monitoring of Migratory Birds (JMMB) project of the Trilateral Monitoring and Assessment Program (TMAP) follows the changes in population size within the Wadden Sea. In this paper we describe and analyse population trends over the years 1991-2009 for 22 waterbird species using the Wadden Sea in internationally important numbers and depending on intertidal mudflats. Population declines predominated in this 18-year period. More populations decreased in Schleswig-Holstein and Niedersachsen than in The Netherlands and Denmark. This is the case particularly for species feeding on polychaetes. In contrast, waterbirds feeding on bivalves are in decline in all regions except Denmark. On the finer spatial scale of tidal basins, these patterns in trends are still apparent, although much variation in trend directions exists within the Dutch Wadden Sea, especially in bivalve specialists. For those species for which we could compare the trend in the Wadden Sea with the trend of their entire flyway population, we found that the former were more negative. This finding and the contrasting trends between regions and tidal basins within the Wadden Sea suggest that causes of the population changes are to be sought within the Wadden Sea itself. These causes, which may act in combination, could be related to factors operating within the Wadden Sea only or with factors operating on a larger scale but having an intensified or differentiated effect within the Wadden Sea. Interestingly, the Wadden Sea regions where negative trends of benthivorous waterbirds predominate are characterized by a large tidal amplitude, whereas areas where bird numbers have generally increased are characterized by a small tidal amplitude. An inventory of possible causes indicated climate change, eutrophication, shellfish fisheries, invasive species and increasing numbers of avian predators as the most important candidates to be investigated further to explain the observed trends.",
author = "{van Roomen}, M. and K. Laursen and {van Turnhout}, C. and {van Winden}, E. and J. Blew and K. Eskildsen and K. G{\"u}nther and B. H{\"a}lterlein and R. Kleefstra and P. Potel and S. Schrader and G. Luerssen and B.J. Ens",
note = "Copyright 2012 Elsevier B.V., All rights reserved.",
year = "2012",
doi = "10.1016/j.ocecoaman.2012.04.004",
language = "English",
volume = "68",
pages = "79--88",
journal = "Ocean & Coastal Management",
issn = "0964-5691",
publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - Signals from the Wadden sea

T2 - Population declines dominate among waterbirds depending on intertidal mudflats

AU - van Roomen, M.

AU - Laursen, K.

AU - van Turnhout, C.

AU - van Winden, E.

AU - Blew, J.

AU - Eskildsen, K.

AU - Günther, K.

AU - Hälterlein, B.

AU - Kleefstra, R.

AU - Potel, P.

AU - Schrader, S.

AU - Luerssen, G.

AU - Ens, B.J.

N1 - Copyright 2012 Elsevier B.V., All rights reserved.

PY - 2012

Y1 - 2012

N2 - The Wadden Sea, shared by Denmark, Germany and the Netherlands, is one of the world's largest intertidal wetlands. Waterbirds are an important element of the Wadden Sea ecosystem. By their migratory behaviour they connect the Wadden Sea with other sites, ranging from the arctic to the western seaboards of Europe and Africa, forming the East-Atlantic Flyway. The Joint Monitoring of Migratory Birds (JMMB) project of the Trilateral Monitoring and Assessment Program (TMAP) follows the changes in population size within the Wadden Sea. In this paper we describe and analyse population trends over the years 1991-2009 for 22 waterbird species using the Wadden Sea in internationally important numbers and depending on intertidal mudflats. Population declines predominated in this 18-year period. More populations decreased in Schleswig-Holstein and Niedersachsen than in The Netherlands and Denmark. This is the case particularly for species feeding on polychaetes. In contrast, waterbirds feeding on bivalves are in decline in all regions except Denmark. On the finer spatial scale of tidal basins, these patterns in trends are still apparent, although much variation in trend directions exists within the Dutch Wadden Sea, especially in bivalve specialists. For those species for which we could compare the trend in the Wadden Sea with the trend of their entire flyway population, we found that the former were more negative. This finding and the contrasting trends between regions and tidal basins within the Wadden Sea suggest that causes of the population changes are to be sought within the Wadden Sea itself. These causes, which may act in combination, could be related to factors operating within the Wadden Sea only or with factors operating on a larger scale but having an intensified or differentiated effect within the Wadden Sea. Interestingly, the Wadden Sea regions where negative trends of benthivorous waterbirds predominate are characterized by a large tidal amplitude, whereas areas where bird numbers have generally increased are characterized by a small tidal amplitude. An inventory of possible causes indicated climate change, eutrophication, shellfish fisheries, invasive species and increasing numbers of avian predators as the most important candidates to be investigated further to explain the observed trends.

AB - The Wadden Sea, shared by Denmark, Germany and the Netherlands, is one of the world's largest intertidal wetlands. Waterbirds are an important element of the Wadden Sea ecosystem. By their migratory behaviour they connect the Wadden Sea with other sites, ranging from the arctic to the western seaboards of Europe and Africa, forming the East-Atlantic Flyway. The Joint Monitoring of Migratory Birds (JMMB) project of the Trilateral Monitoring and Assessment Program (TMAP) follows the changes in population size within the Wadden Sea. In this paper we describe and analyse population trends over the years 1991-2009 for 22 waterbird species using the Wadden Sea in internationally important numbers and depending on intertidal mudflats. Population declines predominated in this 18-year period. More populations decreased in Schleswig-Holstein and Niedersachsen than in The Netherlands and Denmark. This is the case particularly for species feeding on polychaetes. In contrast, waterbirds feeding on bivalves are in decline in all regions except Denmark. On the finer spatial scale of tidal basins, these patterns in trends are still apparent, although much variation in trend directions exists within the Dutch Wadden Sea, especially in bivalve specialists. For those species for which we could compare the trend in the Wadden Sea with the trend of their entire flyway population, we found that the former were more negative. This finding and the contrasting trends between regions and tidal basins within the Wadden Sea suggest that causes of the population changes are to be sought within the Wadden Sea itself. These causes, which may act in combination, could be related to factors operating within the Wadden Sea only or with factors operating on a larger scale but having an intensified or differentiated effect within the Wadden Sea. Interestingly, the Wadden Sea regions where negative trends of benthivorous waterbirds predominate are characterized by a large tidal amplitude, whereas areas where bird numbers have generally increased are characterized by a small tidal amplitude. An inventory of possible causes indicated climate change, eutrophication, shellfish fisheries, invasive species and increasing numbers of avian predators as the most important candidates to be investigated further to explain the observed trends.

UR - http://www.scopus.com/inward/record.url?scp=84860598004&partnerID=8YFLogxK

U2 - 10.1016/j.ocecoaman.2012.04.004

DO - 10.1016/j.ocecoaman.2012.04.004

M3 - Journal article

AN - SCOPUS:84860598004

VL - 68

SP - 79

EP - 88

JO - Ocean & Coastal Management

JF - Ocean & Coastal Management

SN - 0964-5691

ER -