Urban ecosystem management and change during the past millennium: a case study from New York City

Abstract

Changes in a deciduous forest and salt marsh ecosystem, Hunter Island, New York City, are related to management over the past millennium. Sequential methods, fossil pollen analysis, map and aerial photography series, and vegetation resampling were performed to supplement the historical and archaeological records. The enhanced ecosystem management history provides an expanded context to examine management planning alternatives. Siwanoy native Americans utilized Hunter Island to provide fuel, land for corn planting, and living space through cutting forests in at least the northeast portion of the island. The fossil pollen record indicates that about the time of site abandonment, the Siwanoy planted the forest opening with hickory. Dutch colonial settlers protected forest in the area, but later the island's forest was cut for the British Navy during the American Revolution. John Hunter created a gentleman's farm on the island beginning in 1812. The New York City Parks Department purchased Hunter Island in 1888 and permitted social agencies to clear trees for recreation during the next 46 years. The chestnut blight eliminated American chestnut from the forest in 1908, and at the same time a hickory bark beetle infestation decimated the hickory population. A survey in 1934 showed that the northeast portion of the Island contained a forest, dominated by oak and yellow poplar, and a field. The island became a day-use picnic site in 1943, and for this purpose all the woody plants with stems less than 10 cm in diameter were removed. Aerial photography demonstrated a trend of forest replacing field over the past century. A resurvey of the northeast section of the island in 1988 revealed that oak and yellow popular remained dominant in the old forest, and the field became a hickory and sassafras stand. The hickory dominance, which is typical of Hunter Island, is unusual for New York City forests and could be related to native American plantings over 700 years ago. The management plan for Hunter Island is focused on preservation of the field and forest legacy of the recent recreation period. Instead of preserving an environmental patchwork common in New York City parks, an alternative management focus could enhance the hickory forest component to represent the former native American cultural setting.