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Titolo:
Microbiology and vegetation of micro-oases and polar desert, Haughton impact crater, Devon Island, Nunavut, Canada
Autore:
Cockell, CS; Lee, P; Schuerger, AC; Hidalgo, L; Jones, JA; Stokes, MD;
Indirizzi:
British Antarctic Survey, Cambridge CB3 0ET, England British Antarctic Survey Cambridge England CB3 0ET idge CB3 0ET, England NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA NASA Moffett Field CA USA 94035 r, SETI Inst, Moffett Field, CA 94035 USA Dynamac Corp, Kennedy Space Ctr, FL 32899 USA Dynamac Corp Kennedy Space Ctr FL USA 32899 nnedy Space Ctr, FL 32899 USA NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA NASA Houston TX USA 77058 ndon B Johnson Space Ctr, Houston, TX 77058 USA Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ceanog, La Jolla, CA 92093 USA
Titolo Testata:
ARCTIC ANTARCTIC AND ALPINE RESEARCH
fascicolo: 3, volume: 33, anno: 2001,
pagine: 306 - 318
SICI:
1523-0430(200108)33:3<306:MAVOMA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLANT-COMMUNITIES; ELLESMERE ISLAND; DIET SELECTION; NITROGEN; NWT; SUCCESSION; PHOTOSYNTHESIS; ASSOCIATION; TEMPERATURE; PATTERNS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Cockell, CS British Antarctic Survey, High Cross,Madingley Rd, Cambridge CB3 0ET, England British Antarctic Survey High Cross,Madingley Rd CambridgeEngland CB3 0ET
Citazione:
C.S. Cockell et al., "Microbiology and vegetation of micro-oases and polar desert, Haughton impact crater, Devon Island, Nunavut, Canada", ARCT ANTARC, 33(3), 2001, pp. 306-318

Abstract

The input of nutrients into arctic polar deserts, aided by some physical processes, can result in localized areas of high biological productivity-"micro-oases. " We examined the vegetation cover, and microbial and nematode abundance in the polar desert and in 38 micro-oases at the Haughton impact crater, Devon Island, Arctic Canada. Our sites were split between the alluvial terraces along the banks of the Haughton River and the breccia deposits resulting from the asteroid or comet impact 22 Myr ago that flank the alluvial terraces. The alluvial terraces have a vegetation cover that ranges from2 to 11% depending on substrate and water availability with a species richness of 5 in most locations. The vegetation cover on the breccia is much lower, between 0.02 and 3% depending on water availability. The micro-oases on both substrates support between 2 and 98% cover, but they are smaller andmore sparsely distributed than similar features found in the Truelove Lowland, Devon Island, and on Bathurst Island. Microbial and nematode numbers were an order of magnitude greater inside the micro-oases compared to outside. Micro-oases are often dominated by a particular species, resulting in well-defined groups of micro-oases that were separated by TWINSPAN analysis. The micro-oases at Haughton Crater provide insights into the process of colonization of a substrate resulting from an asteroid or comet impact and theunique biological characteristics of such substrates.

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Documento generato il 12/12/19 alle ore 10:02:32