Bryophyte Ecology and Climate Change by Zoltan Tuba

By Zoltan Tuba

Through Tuba, Zoltan ( writer ) [{ Bryophyte Ecology and weather switch by means of Tuba, Zoltan ( writer ) Dec - 31- 2010 ( Hardcover ) } ]

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They provided results of a nineyear experiment with two levels of temperature and two levels of nitrogen and sulphur. 25 m above the bottom layer; this allowed evaluation of the direct effect of increased air and soil temperature. Their results show marked vegetation shifts in response to nitrogen addition and warming following nine years of continuous treatments. Sphagnum cover 15 16 Zolta´n Tuba had drastically decreased, with average Sphagnum cover reduced from 100% to 63% in response to the nitrogen treatment and to 20% in the nitrogen plus temperature treatment.

Lud et al. ) Loeske. It was investigated on Le´ onie Island (67°350 S, 68°200 W, Antarctic Peninsula) in response to short-term changes in UV-B radiation. The researchers found that light response of relative electron transport rate through photosystem II (rel ETR AF/ Fm0 × PPFD), net photosynthesis, and dark respiration remained unaffected by ambient summer levels of UV-B radiation. In addition, no DNA damage was measured as cyclobutane pyrimidine dimers (CPDs); only artificially enhanced UV-B radiation led to formation of 3 7 CPD (106 nucleotides)‒1.

It thus appears to be a matter of reassembly of pre-existing components rather than synthesis of new ones, also known as “constitutive” desiccation tolerance. Bryophytes as indicators of climate change Most bryophytes live in conditions of intermittent water availability. They spend their lives either fully turgid during or after rain (especially desert bryophytes) or dry and metabolically inactive. They are actually drought-evaders rather than drought-resistors. The latter strategy is characteristic of most desert vascular plants, which have evolved storage organs, long roots, as well as transcription and protein synthesis after a slower drying period than that which bryophytes often experience.

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