{"type": "FeatureCollection", "features": [{"id": "10.1016/j.baae.2006.07.001", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:15:22Z", "type": "Journal Article", "created": "2006-08-31", "title": "Patch Choice Of Avian Herbivores Along A Migration Trajectory - From Temperate To Arctic", "description": "<p>Migratory waterfowl species seem to track temporal and spatial pulses of optimal forage availability on their way from temperate wintering to arctic breeding sites. In order to unravel the relative contribution of forage quality and forage biomass to foraging choices in avian herbivores, we experimentally manipulated biomass and quality of main forage plants through fertilisation and grazing exclusion at three sites along the flyway of barnacle geese, Branta leucopsis. Fertilisation increased the nitrogen content of the forage and grazing exclusion increased biomass levels. Manipulated plots were offered to wild geese in a random block experimental design and goose visitation was measured through dropping counts. At all sites there was a trend towards a higher preference of plots with increased quality and average biomass above plots with an average quality and increased biomass. Generally, geese preferred plots with highest standing crop of nitrogen. The numerical response of the geese to forage changes was supported by behavioural observations at the Baltic site. We conclude that for migrating barnacle geese the bottlenecks in the standing crop of nitrogen appear to tie in the limited biomass availability at the Baltic stopover site and the limited nutrient content of food in the Arctic breeding site, restricting the potential nutrient intake on these sites. (C) 2006 Gesellschaft fur Okologie. Published by Elsevier GmbH. All rights reserved.</p>", "keywords": ["barnacle goose", "0106 biological sciences", "SNOW GEESE", "BRENT GEESE", "KOLOKOLKOVA BAY", "Branta leucopsis", "B-BERNICLA", "15. Life on land", "BARNACLE GEESE", "GOOSE POPULATION", "grazing experiment", "01 natural sciences", "ptant-herbivore interactions", "salt marsh", "FOOD QUALITY", "flyway", "forage quality", "FORAGING BEHAVIOR", "plant biomass", "GEESE BRANTA-LEUCOPSIS", "BODY-SIZE"], "contacts": [{"organization": "R.H. Drent, Julia Stahl, A. J. van der Graaf, G. F. (Ciska) Veen, R.M. Havinga,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1016/j.baae.2006.07.001"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Basic%20and%20Applied%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.baae.2006.07.001", "name": "item", "description": "10.1016/j.baae.2006.07.001", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.baae.2006.07.001"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-07-01T00:00:00Z"}}, {"id": "10.1890/07-1601.1", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:18:38Z", "type": "Journal Article", "created": "2008-08-06", "title": "Habitat Type Determines Herbivory Controls Over Co2 Fluxes In A Warmer Arctic", "description": "High-latitude ecosystems store large amounts of carbon (C); however, the C storage of these ecosystems is under threat from both climate warming and increased levels of herbivory. In this study we examined the combined role of herbivores and climate warming as drivers of CO2 fluxes in two typical high-latitude habitats (mesic heath and wet meadow). We hypothesized that both herbivory and climate warming would reduce the C sink strength of Arctic tundra through their combined effects on plant biomass and gross ecosystem photosynthesis and on decomposition rates and the abiotic environment. To test this hypothesis we employed experimental warming (via International Tundra Experiment [ITEX] chambers) and grazing (via captive Barnacle Geese) in a three-year factorial field experiment. Ecosystem CO2 fluxes (net ecosystem exchange of CO2, ecosystem respiration, and gross ecosystem photosynthesis) were measured in all treatments at varying intensity over the three growing seasons to capture the impact of the treatments on a range of temporal scales (diurnal, seasonal, and interannual). Grazing and warming treatments had markedly different effects on CO2 fluxes in the two tundra habitats. Grazing caused a strong reduction in CO2 assimilation in the wet meadow, while warming reduced CO2 efflux from the mesic heath. Treatment effects on net ecosystem exchange largely derived from the modification of gross ecosystem photosynthesis rather than ecosystem respiration. In this study we have demonstrated that on the habitat scale, grazing by geese is a strong driver of net ecosystem exchange of CO2, with the potential to reduce the CO2 sink strength of Arctic ecosystems. Our results highlight that the large reduction in plant biomass due to goose grazing in the Arctic noted in several studies can alter the C balance of wet tundra ecosystems. We conclude that herbivory will modulate direct climate warming responses of Arctic tundra with implications for the ecosystem C balance; however, the magnitude and direction of the response will be habitat-specific.", "keywords": ["Greenhouse Effect", "0106 biological sciences", "Barnacle Goose", "herbivory", "Arctic Regions", "Temperature", "Branta leucopsis", "Feeding Behavior", "Carbon Dioxide", "Plants", "15. Life on land", "01 natural sciences", "Random Allocation", "Arctic", "climate change", "vegetation", "13. 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