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Macroecological analyses support an overkill scenario for late Pleistocene extinctions.
1Laboratório de Ecologia Teórica e Síntese, Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Goiás, CEP 74001-970, Goiânia, GO, Brazil. diniz@icb1.ufg.br
Brazilian Journal of Biology = Revista Brasleira De Biologia
|December 30, 2004
Summary
Pleistocene megafauna extinction was likely caused by human hunting (overkill), not just climate change. A new model using body mass effectively predicted species survival or extinction, supporting the overkill hypothesis.
Area of Science:
- Paleontology
- Macroecology
- Archaeology
Background:
- The extinction of Pleistocene megafauna is debated, with environmental changes and human hunting (overkill) as primary hypotheses.
- Previous models faced challenges in distinguishing between these scenarios due to data limitations.
Purpose of the Study:
- To develop and test a macroecological model for the overkill hypothesis of Pleistocene megafauna extinction.
- To assess the role of body mass in predicting species survival or extinction.
Main Methods:
- A macroecological model was created for the overkill hypothesis.
- Prey population parameters (abundance, geographic extent, food supply) were derived from allometric relationships with body mass.
Main Results:
- The model accurately predicted the fate of 73% of Pleistocene megafauna species.
- This predictive accuracy is comparable to more complex, data-intensive models.
- Extinction patterns showed high selectivity based on body mass.
Conclusions:
- The findings lend significant support to the overkill hypothesis for Pleistocene megafauna extinction.
- Body mass is a key factor influencing extinction risk, highlighting the model's effectiveness.