Item talk:Q256048
From geokb
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"name": "The nitrogen window for arctic herbivores: plant phenology and protein gain of migratory caribou (Rangifer tarandus)",
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"abstract": "Terrestrial plants are often limited by nitrogen (N) in arctic systems, but constraints of N supply on herbivores are typically considered secondary to those of energy. We tested the hypothesis that forage N is more limiting than energy for arctic caribou by collecting key forages (three species of graminoids, three species of woody browse, and one genus of forb) over three summers in the migratory range of the Central Arctic Herd in Alaska from the Brooks Range to the Coastal Plain on the Arctic Ocean. We combined in\u00a0vitro digestion and detergent extraction to measure fiber, digestible energy, and usable fractions of N in forages (n\u00a0=\u00a0771). Digestible energy content fell below the minimum threshold value of 9\u00a0kJ/g for one single forage group: graminoids, and only beyond 64\u201375\u00a0d from parturition (6 June), whereas all forages fell below the minimum threshold value for digestible N (1% of dry matter) before female caribou would have weaned their calves at 100\u00a0d from parturition. The window for digestible N was shortest for browse, which fell below 1% at 30\u201341\u00a0d from parturition, whereas digestible N contents of graminoids were adequate until 46\u201357\u00a0d from parturition. The low quality of browse as a source of N was also apparent from concentrations of available N (i.e., the N not bound to fiber) that were <1% at 72\u201380\u00a0d from parturition. The Coastal Plain may be favored by female caribou because available and digestible concentrations of N are not only greater than those on the Brooks Range, the window of usable N on the Coastal Plain extends the period of protein gain for females and their calves by 17\u00a0d. Conversely, inland areas with greater biomass and densities of digestible N than the Coastal Plain may be more favorable for large male caribou that begin gaining protein from spring to breed in autumn. Our study provides evidence that phenological windows for protein gain in caribou are both spatially and temporally dynamic and likely to affect the distribution and growth of the population.",
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