We maintain a categorized list of invasive species across the LHPRISM region to help inform management in accordance with regional priorities. The tier list puts species in categories based on impact, location, abundance, distribution and feasibility of response. LHPRISM’s Tier Ranking List relies heavily on New York State Invasiveness Ranking Assessments conducted by the NYSDEC as well as information from boots-on-the-ground experts.
Tier Descriptions
Prevention/EDRR (Early Detection, Rapid Response)- High and very high impact species not yet in the Lower Hudson region. Highest level of early detection survey efforts. Conduct delineation surveys, engage community scientists to detect and report, and assign to appropriate tier if detected. Manage high-priority areas and pathways to resist and
prevent invasion.
• 1a: Prevention/EDRR- High and very high impact species, or potentially so, within a 100-mile buffer, with potential for establishment.
• 1b: Prevention/EDRR – High and very high impact species, or potentially so, in Eastern North America, with potential for establishment.
• 1c: Prevention/EDRR – High and very high impact species, or potentially so, far outside the buffer and not in Eastern North America, but an introduction pathway exists.
High and very high impact species, or potentially so, with low enough abundance and suitable treatment methods to make eradication feasible within the Lower Hudson region. Highest level of rapid response efforts. Need delineation surveys and community science to determine the full extent.
High and very high-impact species, or potentially so, that are too widespread in the Lower Hudson region for eradication, but low enough in abundance to consider local or regional containment. Target strategic management to slow the spread, since surrounding sites and regions could be at risk if left unattended.
High and very high impact species, or potentially so, that are well-established. Eradication at the regional level is not feasible. Consider localized management to contain, exclude, or suppress, only if justified and feasible to protect regional conservation targets and to meet conservation management goals.
Species that need more research, mapping, and monitoring to understand their invasiveness. This includes naturalized species and cultivated-only species that are known to be invasive in other regions but are not yet invasive here. Invasiveness may change with environmental or genetic changes. Should monitor populations on a regular basis to see if they are starting to become invasive and assign to appropriate Tier if invasive infestations detected.
Invasion Curve
If an invasive plant or animal species is not detected and removed early, then expensive and long-term management may be unavoidable.
