Hydrilla.org published a state-by-state educational resource organizing Hydrilla verticillata distribution data across five U.S. ecological regions, drawing on USGS and University of Georgia EDDMapS databases to support environmental managers and aquatic plant control specialists.
-- Hydrilla.org has published a new state-by-state educational resource that provides environmental managers and aquatic plant control specialists with distribution data for Hydrilla verticillata across the United States. The resource organizes information by five ecological regions—Southeast, Gulf Coast & Lower Mississippi Basin, Inland River & Reservoir Systems, Mid-Atlantic, and Western U.S.—and draws on authoritative data from the U.S. Geological Survey (USGS) and the University of Georgia's EDDMapS (Early Detection & Distribution Mapping System). Designed to address a critical management challenge, the tool consolidates fragmented federal databases into an accessible format that supports strategic planning and risk assessment.
More information is available at https://hydrilla.org/distribution
Hydrilla verticillata poses a severe threat to U.S. waterways, growing up to 2.5 cm (1 inch) per day and, under optimal conditions, potentially up to a foot (approximately 30 cm) per day. Dense mats formed by this invasive species reduce sunlight penetration and deplete oxygen levels. According to independent studies, these mats can reduce irrigation flow rates by up to 90 percent, hindering agricultural operations and hydroelectric power production by clogging water intake pipes and filters. The rapid spread and ecological disruption caused by this invasive aquatic plant underscore the urgent need for distribution data that enables managers to coordinate responses across state lines and watershed boundaries.
Federal and state authorities have recognized the severity of the threat through regulatory action and targeted management programs. Classified as a federally listed noxious weed, Hydrilla is prohibited from possession, distribution, or interstate transport, yet infestations persist across multiple regions. California's statewide Hydrilla Eradication Program has successfully eradicated the species from 15 counties, including a major effort at Clear Lake that began in 1994. Meanwhile, the U.S. Army Corps of Engineers commenced a research and demonstration project in 2023 to manage a unique strain in the Connecticut River, conducting initial herbicide field demonstrations at five sites in 2024. These efforts demonstrate that management is active but fragmented, reinforcing the need for centralized, accessible distribution data.
The new resource published by Hydrilla.org addresses this gap by organizing distribution information into five ecological regions, each subdivided by state with context-specific details about infestation patterns, habitat characteristics, and management relevance. The Southeast region, for example, includes Florida as the original U.S. introduction point and a state with a highly extensive and prioritized management program, while the Western U.S. section highlights detections in managed reservoirs, irrigation canals, and interstate water transfer systems in California, Arizona, and Nevada. By structuring data according to ecological connectivity rather than political boundaries alone, managers can understand both local conditions and regional interconnections that influence spread and control strategies.
Hydrilla.org built the resource on peer-reviewed research and data from the U.S. Geological Survey's Nonindigenous Aquatic Species Database and the University of Georgia's EDDMapS (Early Detection & Distribution Mapping System), which provide state, county, point-level, and GIS data. Environmental managers and aquatic plant control specialists previously had to cross-reference multiple databases to assemble a complete picture of distribution patterns. By curating and organizing this information, Hydrilla.org has transformed fragmented federal data into a strategic planning tool that supports coordinated management across jurisdictions.
Environmental managers and aquatic plant control specialists can use the resource to assess risk, plan interventions, and coordinate efforts across state lines. The platform also provides access to related guides on control methods and ecological and economic impacts, enabling stakeholders to integrate distribution data with broader management strategies. Hydrilla.org invites professionals to reference state-specific information and the underlying federal data sources to support evidence-based decision-making in invasive aquatic plant management.
Visit https://hydrilla.org to access the complete Hydrilla guide and related resources.
Contact Info:
Name: Clifton L. Helmer
Email: Send Email
Organization: Hydrilla.org
Address: 982 Hood Avenue, San Diego, CA 92117, United States
Website: https://hydrilla.org
Source: PressCable
Release ID: 89185954
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