From the text ... 'Despite the recognized importance of pollination services, there is a growing body of evidence that suggests pollinators are at risk. In the United States, the National Research Council (2006) reported that both managed honey bee colonies and wild pollinators showed significant declines. The causes of decline are difficult to pinpoint, but loss of floral diversity and habitat due to increasing urbanization, expansion of intensive agriculture, invasive plants, widespread use of pesticides, climate change, and disease and parasites have all had a negative impact on pollinator populations (National Research Council 2006). As pressure on pollinators increases from human activities and other factors, undeveloped habitat and natural areas can play a substantial role as long-term refugia for these animals.' © 2007 The Xerces Society for Invertebrate Conservation.