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Biological Data Gateway: Introduction
The first of these is species, both plant and animal. Maps for a wide variety of species exist, some delineating distribution, some detailing abundance, and some demonstrating seasonal ranges. Other maps provide long-range views of how species populations and habitats have changed across recent years or even decades. Biologists and ecologists think of the second category, places, in two
distinct ways. Ecoregions, as the term itself suggests, are defined regionally.
Third, there are special issues. Something of a catchall category, special issues cut across place and species considerations to focus on problems of special concern. Invasive species, endangered species, biodiversity, contaminants, climate change, and wildlife mortality have been identified by the Nation's ecologists and biologists as among the most pressing challenges confronting species and habitats today. Biological Data Gateway: Species
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