Landscape paleoecology and megafaunal extinction in southeastern New York State

Stratigraphic palynological analyses of four late Quaternary deposits comprise a landscape-level study of the patterns and processes of megafaunal extinction in southeastern New York State. Distinctive spores of the dung fungus Sporormiella are used as a proxy for megafaunal biomass, and charcoal pa...

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Bibliographic Details
Published in:Ecological monographs 2005-08, Vol.75 (3), p.295-315
Main Authors: Robinson G.S, Burney, L.P, Burney, D.A
Format: Article
Language:English
Subjects:
Animal and plant ecology
animal ecology
Animal, plant and microbial ecology
Biological and medical sciences
Charcoal
Climate change
dung fungi
Endangered & extinct species
extinction
extinctions
fauna
fire history
Fires
fossils
Fundamental and applied biological sciences. Psychology
Fungi
General aspects
human impacts
Human influences
mastodons
megafauna
microscopic charcoal
Paleoecology
palynology
plant ecology
Pollen
Radiocarbon
Sediments
species diversity
Species extinction
Spores
Sporormiella
Stratigraphy
Taxa
Younger Dryas
Younger Dryas period
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Summary:Stratigraphic palynological analyses of four late Quaternary deposits comprise a landscape-level study of the patterns and processes of megafaunal extinction in southeastern New York State. Distinctive spores of the dung fungus Sporormiella are used as a proxy for megafaunal biomass, and charcoal particle analysis as a proxy for fire history. A decline in spore values at all sites is closely followed by a stratigraphic charcoal rise. It is inferred that the regional collapse of a megaherbivory regime was followed by landscape transformation by humans. Correlation with the pollen stratigraphy indicates these developments began many centuries in advance of the Younger Dryas climatic reversal at the end of the Pleistocene. However, throughout the region, the latest bone collagen dates for Mammut are considerably later, suggesting that megaherbivores lasted until the beginning of the Younger Dryas, well after initial population collapse. This evidence is consistent with the interpretation that rapid overkill on the part of humans initiated the extinction process. Landscape transformation and climate change then may have contributed to a cascade of effects that culminated in the demise of all the largest members of North America's mammal fauna.
ISSN:0012-9615
1557-7015
DOI:10.1890/03-4064