By Paul A Collinvaux, Paulo E. De Oliveira, Enrique Moreno
Amazon will turn out a robust device for ecologists and weather modelers. It additionally includes short stories of pioneering pollen paintings within the Amazon up to now; sections on pollen tools, pollen statistics, paleoecology, and lake coring tools.
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Additional info for Amazon: Pollen Manual and Atlas
But how much drier? One recent geological review takes the argument for tropical aridity so far as to map the entire extent of the ice-age Amazon lowlands as savanna (Clapperton, 1993). Biologists mindful of the necessity for maintaining diversity through the ice-age are more modest, allowing islands of forest, which they call ‘refuges,’ to persist in a grand savanna sea. 2). But maps showing the Amazon to be arid do serve as statements of an hypothesis that is open to testing. They state that the Amazon lowlands held savanna in ice-age time, a proposition easily tested by core drilling and pollen analysis of ancient Amazonian lakes.
His thermometer was the ratio of noble gasses in solution. , 1995). , 1994). , 1997). ”6 So the paradigm is shifting towards acceptance of cooler tropics in glacial times. This feels sweet after so many years of having anonymous reviewers trounce manuscripts and grant proposals for the suggestion that the lowland tropics cooled. Even scientists have human pleasures. WAS THE AMAZON EVER ARID? But what of the third likely parameter of climatic change, precipitation? The prevailing paradigm is that the tropics were arid in ice-age time.
But the chemistry of C4 and CAM plants has the special peculiarity that the plants can absorb CO2 from CO2 deficient air more rapidly than can the more usual C3 plants. Thus cacti, bromeliads, and most importantly savanna grasses, might be expected to have had an advantage in the CO2-starved air of the ice age. We see the ice-age forests as even more heavily draped with bromeliad epiphytes than Amazon Pollen manual and atlas 20 contemporary forests, perhaps with more bromeliads on the ground cover too.
Amazon: Pollen Manual and Atlas by Paul A Collinvaux, Paulo E. De Oliveira, Enrique Moreno