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Species Categorization (Priorities)


The Lower Hudson PRISM's Focal Species Working Group has categorized many of the invasive species found within the PRISM region into 5 Tiers: Tier 1 - threat, Tier 2 - emerging, Tier 3 - established, Tier 4 - widespread, and Tier M - monitor species (formerly Tier 5). The tier categorization was created as a way to standardize categories throughout New York State. This is a working list and should not be considered a finalized list.

  • v2.5 Updated January 10, 2023 - updates to terrestrial invasive plants and aquatic plants and animals
Document Author 
Species Categorization Working Group
Document Type