Kuijper, Dries Pieter Jan; Ubels, R; Loonen, Maarten J J E (2009): (Table 2) Protein and fibre content of important food plants of barnacle geese (Branta leucopsis) in Adventdalen [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.812682, Supplement to: Kuijper, DPJ et al. (2009): Density-dependent switches in diet: a likely mechanism for negative feedbacks on goose population increase? Polar Biology, 32(12), 1789-1803, https://doi.org/10.1007/s00300-009-0678-2
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Abstract:
Goose grazing on arctic tundra vegetation has shown both positive and negative effects on subsequent foraging conditions. To understand the potential of a density-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 pressure in these low-productive habitats. The potential for density-dependent feedbacks on local population increase is discussed.
Project(s):
Coverage:
Latitude: 78.200000 * Longitude: 16.700000
Date/Time Start: 2003-06-30T00:00:00 * Date/Time End: 2003-06-30T00:00:00
Event(s):
Comment:
During sampling, selective grazing by geese was mimicked by selecting only live leaf tips of every encountered plant or fresh tops of mosses. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Habitat | Habitat | Kuijper, Dries Pieter Jan | |||
| 2 | DATE/TIME | Date/Time | Geocode | |||
| 3 | Date/time end | Date/time end | Kuijper, Dries Pieter Jan | |||
| 4 | Species | Species | Kuijper, Dries Pieter Jan | |||
| 5 | Sample type | Samp type | Kuijper, Dries Pieter Jan | |||
| 6 | Sample amount | N | # | Kuijper, Dries Pieter Jan | ||
| 7 | Proteins | Protein | % | Kuijper, Dries Pieter Jan | % ash-free dry weight | |
| 8 | Proteins, standard deviation | Protein std dev | ± | Kuijper, Dries Pieter Jan | ||
| 9 | Acid detergent fibre | ADF | % | Kuijper, Dries Pieter Jan | Determined according to Goering and Van Soest (1970) | % ash-free dry weight |
| 10 | Acid detergent fibre, standard deviation | ADF std dev | ± | Kuijper, Dries Pieter Jan | Determined according to Goering and Van Soest (1970) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
60 data points
Data
| 1 Habitat | 2 Date/Time | 3 Date/time end | 4 Species | 5 Samp type | 6 N [#] | 7 Protein [%] | 8 Protein std dev [±] | 9 ADF [%] | 10 ADF std dev [±] |
|---|---|---|---|---|---|---|---|---|---|
| Wet tundra | 2003-06 | 2003-08 | Equisetum arvense | 4 | 25.3 | 2.3 | 17.8 | 1.3 | |
| Wet tundra | 2003-06 | 2003-08 | Dupontia fisherii | 4 | 18.7 | 2.3 | 26.2 | 1.3 | |
| Wet tundra | 2003-06 | 2003-08 | Calliergon sp. | moss | 4 | 11.9 | 0.4 | 47.7 | 2.7 |
| Mesic tundra | 2003-06 | 2003-08 | Alopecurus borealis | 4 | 16.9 | 2.3 | 24.6 | 0.6 | |
| Mesic tundra | 2003-06 | 2003-08 | Bistorta vivipara | rhizome | 4 | 7.2 | 0.7 | 31.4 | 3.6 |
| Mesic tundra | 2003-06 | 2003-08 | Tomentyphnum sp. | moss | 4 | 5.0 | 0.5 | 40.8 | 1.2 |
| Mesic tundra | 2003-06 | 2003-08 | Bistorta vivipara | leaf | 4 | 20.2 | 1.5 | 28.8 | 0.7 |