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- W2016808254 abstract "Objectives Reindeer [Rangifer tarandus spp.) commonly use areas dominated by lichen mats for winter habitats. Dependent on lichen richness, 40 70% of the winter diet consists of variable proportions of Cetraria nivalis, Cladina mitis and C. stellans. Areas with poor snow cover on Norwegian wild reindeer ranges are commonly dominated by these lichens and it is often this lichen grazing resource which restricts the carrying capacity. Where the lichen grow in the microhabitat depends on the duration of snow cover, and how fast they grow depends on the precipitation and moisture regime in the snow free period. When moist they grow from the top but rot at the bottom. Young, small individuals grow fast, about 20% per year, but they taper off as the mat becomes thicker. When fully grown, they grow and rot at the same speed and no net gain in size is made. H o w these lichens get their moisture: dew and frequent light rainfall versus infrequent, but heavy rainfall, influence biomass stabilization. In coastal climates in Norway pure mats of Cladina mitis have standing biomasses of 1100 g D M (Dry Matter)/m2, in continental climates, lichen mats have up to 1800 gDM/m 2 . Grazing by reindeer works in two different manners. Heavy grazing tends to clip the mat, but light grazing tends to thin it. To measure the growth of grazed mats I set up an experiment where the two grazing effects are simulated separately, and report here some results from the Cladina mitis tests, one of the most preferred species. Methods Samples of about 10 g D M were separated out from a Cladina mitis-maty and placed in round trays with a bottom size 0.9 dm 2 . The most rotten bottom part was carefully removed. Care was taken not to alter the density of the lichen, to avoid influencing the conditions of growth or decomposition. Three treatments were applied — each in five parallels." @default.
- W2016808254 created "2016-06-24" @default.
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- W2016808254 date "1986-06-01" @default.
- W2016808254 modified "2023-10-16" @default.
- W2016808254 title "Does grazing influence growth of the reindeer lichen Cladina mitis?" @default.
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- W2016808254 doi "https://doi.org/10.7557/2.6.2.674" @default.
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