Short?term effects of summer warming on caribou forage quality are mitigated by long?term warming
نویسندگان
چکیده
Rapid Arctic climate change is leading to woody plant-dominated ecosystems with potential consequences for caribou foraging and nutritional ecology. While warming has been clearly linked shrub expansion, the influence of higher temperatures on variables leaf-level quality forage equivocal. Moreover, results in a complex set ecosystem changes that operate different timescales such as not only rapidly accelerating phenology, but also slowly increasing thaw depth plant access soil resources. Here, we compare leaf nitrogen (N) concentration, digestibility, protein-precipitating capacity (PPC) short-term (i.e., <1–2 summers) long-term (approximately 25 years) experimental plots ambient temperature three species commonly included summer diets: Salix pulchra (diamond-leaf willow), Betula nana (dwarf birch), Eriophorum vaginatum (cottongrass). Short-term modestly decreased N concentration B. nana. Long-term slightly increased digestibility S. pulchra, Greater dry matter both shrubs occurred through reductions lignin cutin quantity cells. had no impact PPC equivocal digestible protein Overall, found be more impactful than at Toolik Lake, Alaska. Apart from reduction approximately 13% acid detergent nana, other differences were observed plots. Hence, our indicate acclimation plants or possible negative feedback system reduce effects. We suggest summers may have lesser effect winter precipitation abundance critical diet.
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ژورنال
عنوان ژورنال: Ecosphere
سال: 2022
ISSN: ['2150-8925']
DOI: https://doi.org/10.1002/ecs2.4104