What Mineral Products Come From the Amazon Basin
journal article
Journal of Biogeography
Published By: Wiley
https://doi.org/10.2307/2845412
https://www. jstor .org/stable/2845412
The explosion crater (maar) Lake Kumpaka in the western Amazon basin of Ecuador has yielded an 18.6 m sediment core spanning 5200 radiocarbon years. Sedimentary stratigraphy and pollen analysis provide the first record of rain forest climate and vegetation at a site undisturbed by riverine process. Deeper sediments were deposited very rapidly, apparently as a result of a 500-year episode of drier climate that led to massive slumping or rapid erosion about 4000 years ago. A complex history of local storms is preserved through the upper part of the record as textural banding. A three-zone pollen history is recognized, with boundaries at 3300 and 900 years BP. All three pollen zones are taken to represent facies of intact tropical rain forest. A large influx of pollen of the colonizing trees is present at all intervals, but the remaining pollen is of a diverse array of rain forest trees. About 350 pollen taxa are recognized, but only about 100 can be named. Changes in the pollen diagram synchronous with the postulated flooding event of northern Ecuadorian Amazonia 1300-800 years ago are apparent, but the palaeoecological significance of the changes cannot be assessed satisfactorily with the present data. It is possible that the regime of high precipitation in northern Ecuador was contemporaneous with a drier climate at Kumpaka, suggesting that the two sites may be on opposite sides of a climatic divide. The pollen record demonstrates that a complex history of Amazonian rain forest is preserved in lake sediments, despite the prevailing animal pollination mechanisms.
The subjects of biogeography, ecology and biodiversity are now of truly global importance. Recognizing this increased significance, the scope of the Journal of Biogeography and its sister publications, Global Ecology and Biogeography and Diversity and Distributions, continue to be developed under the guidance of Dr Robert Whittaker and Dr David Richardson respectively, acting as a team with Professor Philip Stott, the Editor of Journal of Biogeography. All three journals have wide coverage–from 'enhanced global warming' to the distribution of gadoid fishes, from invertebrate diversity in tropical rain forests to individualist species responses–so that all the key biogeographical and ecological questions of the day may be addressed. Topics include 'what is naturalness?', debates on both philosophy and methods, the implications of ecosystem fragmentation, the impact of human-induced changes, as well as the ecological and economic significance of biodiversity. All systematic groups are also embraced, from theory to practice, from plants to animals. Journal of Biogeography is essential reading for all environmentalists, biogeographers, ecologists, biologists, botanists and zoologists. JSTOR provides a digital archive of the print version of Journal of Biogeography. The electronic version of Journal of Biogeography is available at http://www.interscience.wiley.com. Authorized users may be able to access the full text articles at this site.
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What Mineral Products Come From the Amazon Basin
Source: https://www.jstor.org/stable/2845412