Intraspecific variation in Podostemum ceratophyllum (Podostemaceae): evidence of refugia and colonization since the last glacial maximum
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چکیده
منابع مشابه
New evidence for high discharge to the Chukchi shelf since the Last Glacial Maximum
Using CHIRP subbottom profiling across the Chukchi shelf, offshore NW Alaska, we observed a large incised valley that measures tens of kilometers in width. The valley appears to have been repeatedly excavated during sea level lowering; however, the two most recent incisions appear to have been downcut during the last sea level rise, suggesting an increase in the volume of discharge. Modern drai...
متن کاملThe Last Glacial Maximum.
We used 5704 14C, 10Be, and 3He ages that span the interval from 10,000 to 50,000 years ago (10 to 50 ka) to constrain the timing of the Last Glacial Maximum (LGM) in terms of global ice-sheet and mountain-glacier extent. Growth of the ice sheets to their maximum positions occurred between 33.0 and 26.5 ka in response to climate forcing from decreases in northern summer insolation, tropical Pac...
متن کاملClimate refugia: from the Last Glacial Maximum to the twenty-first century.
ThehistoryofEarth is ahistoryof recurrent climate change.Today’s globalbiodiversitydemonstrates thatmany specieshavebeenable to cope with climate shifts in the past. Yet great concern exists that modern climate change is likely to overstrain the capacity of many species to track suitable climate spaces, potentially leading to widespread extinctions through the coming decades. This view is furth...
متن کاملPhylogeographic history of white spruce during the last glacial maximum: uncovering cryptic refugia.
Although a recent study of white spruce using chloroplast DNA uncovered the presence of a glacial refuge in Alaska, chloroplast failed to provide information on the number or specific localities of refugia. Recent studies have demonstrated the utility of nuclear microsatellites to refine insights into postglacial histories. The greater relative rate of mutation may allow finer scale resolution ...
متن کاملFactors controlling variability in the oxidative capacity of the troposphere since the Last Glacial Maximum
The oxidative capacity of past atmospheres is highly uncertain. We present here a new climate–biosphere– chemistry modeling framework to determine oxidant levels in the present and past troposphere. We use the GEOS-Chem chemical transport model driven by meteorological fields from the NASA Goddard Institute of Space Studies (GISS) ModelE, with land cover and fire emissions from dynamic global v...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 2012
ISSN: 0002-9122,1537-2197
DOI: 10.3732/ajb.1100275