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Pollen evidence of maize cultivation 2700 B.P. at La Selva Biological Station, Costa Rica

Horn, Kennedy
From the text... 'Because maize is a plant that requires human cultivation for survival, we can infer from the distribution of maize pollen that sedentary agriculturalists were present at La Selva by 2700 B.P. This interpretation is consistent with…
Type: Document
Year: 2001

Fire ecology in Shenandoah National Park

Wilhelm
From the Conclusions ... 'Prior to becoming a national park, Shenandoah had gone through periods of indiscriminate logging, hunting, livestock grazing, and burning. Then the area entered the National Park System and shifted abruptly to a regime of…
Type: Document
Year: 1973