ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase?
Abstract Goose grazing on arctic tundra vegetation has shown both positive and negative effects on subsequent foraging conditions. To understand the potential of a den-sity-dependent feedback on herbivore population size, the relation between grazing pressure and future foraging conditions is essent...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.518.4034 2023-05-15T15:06:09+02:00 ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? M. J. J. E. Loonen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.4034 http://www.maartenloonen.nl/literatuur/kuijper_polar_biology2009.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.4034 http://www.maartenloonen.nl/literatuur/kuijper_polar_biology2009.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.maartenloonen.nl/literatuur/kuijper_polar_biology2009.pdf text ftciteseerx 2016-01-08T09:58:26Z Abstract Goose grazing on arctic tundra vegetation has shown both positive and negative effects on subsequent foraging conditions. To understand the potential of a den-sity-dependent feedback on herbivore population size, the relation between grazing pressure and future foraging conditions is essential. We studied the effect of increasing grazing pressure of barnacle geese (Branta leucopsis) on Spitsbergen. During the establishment of a breeding colony in the period 1992–2004, the proportion of graminoids decreased in the diet of wild geese, while the percentage of mosses increased. Grazing trials with captive geese in an unexploited area showed a similar shift in diet composition. High-quality food plants were depleted within years and over years. Intake rate declined too and as consequence, metabolisable energy intake rate (MEIR) decreased rapidly with increasing grazing pressure. During three successive years of experimental grazing, MEIR decreased at all levels of grazing pressure and declined below minimal energetic requirements when grazing exceeded natural levels of grazing pressure. This suggests that foraging conditions rapidly decline with increasing grazing pre-ssure in these low-productive habitats. The potential for density-dependent feedbacks on local population increase is discussed. Text Arctic Branta leucopsis Tundra Spitsbergen Unknown Arctic |
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ftciteseerx |
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English |
description |
Abstract Goose grazing on arctic tundra vegetation has shown both positive and negative effects on subsequent foraging conditions. To understand the potential of a den-sity-dependent feedback on herbivore population size, the relation between grazing pressure and future foraging conditions is essential. We studied the effect of increasing grazing pressure of barnacle geese (Branta leucopsis) on Spitsbergen. During the establishment of a breeding colony in the period 1992–2004, the proportion of graminoids decreased in the diet of wild geese, while the percentage of mosses increased. Grazing trials with captive geese in an unexploited area showed a similar shift in diet composition. High-quality food plants were depleted within years and over years. Intake rate declined too and as consequence, metabolisable energy intake rate (MEIR) decreased rapidly with increasing grazing pressure. During three successive years of experimental grazing, MEIR decreased at all levels of grazing pressure and declined below minimal energetic requirements when grazing exceeded natural levels of grazing pressure. This suggests that foraging conditions rapidly decline with increasing grazing pre-ssure in these low-productive habitats. The potential for density-dependent feedbacks on local population increase is discussed. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
M. J. J. E. Loonen |
spellingShingle |
M. J. J. E. Loonen ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
author_facet |
M. J. J. E. Loonen |
author_sort |
M. J. J. E. Loonen |
title |
ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
title_short |
ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
title_full |
ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
title_fullStr |
ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
title_full_unstemmed |
ORIGINAL PAPER Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
title_sort |
original paper density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.4034 http://www.maartenloonen.nl/literatuur/kuijper_polar_biology2009.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Branta leucopsis Tundra Spitsbergen |
genre_facet |
Arctic Branta leucopsis Tundra Spitsbergen |
op_source |
http://www.maartenloonen.nl/literatuur/kuijper_polar_biology2009.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.4034 http://www.maartenloonen.nl/literatuur/kuijper_polar_biology2009.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766337811650183168 |