U.S. Fish and Wildlife Service Logo U.S. Fish and Wildlife Service

Volunteer Invasives Mapping Project Report

Display Report


First Year of Project
Station: Aransas NWR
Region: 2
Contact Person: Darrin Welchert
Contact Phone Number: 361.286.3559 ext. 223
Date Report Submitted:

List Type and/or Affiliation(s) of Volunteers: Refuge Volunteers, Texas Master Naturalist, & FAMI
Total Number of Volunteers Trained to Map: 6
Total Number of Volunteer Hours Spent Mapping: 258

List of Invasives Species Mapped:Common NameScientific Name
  Angleton bluestem Dichanthium aristatum
Australian bluestem Bothriochloa bladhii
Chinese tallow Sapium sebiferum
guineagrass Urochloa maxima
Johnsongrass Sorghum halepense
King Ranch bluestem Bothriochloa ischaemun
McCartney Rose Rosa bracteata
salt cedar Tamarix spp.
vaseygrass Paspalum urvillei
Which, if any, of these Species are Early Detection Species: Australian bluestem, and vaseygrass
Total Number of Acres Mapped (since project initiation): 3,316 with volunteers (12,040 total with additional funding)
Have You Shared Mapping Data with USGS in Ft. Collins? Yes

Describe Projects Initiated with Follow-Up Funds ($10,000): Follow-up funds were not received in FY2007. Overall the Aransas National Wildlife Refuge Complex surveyed and mapped over 7,000 acres in 2007 for invasive species on both the Aransas and Matagorda Island Units. Volunteers contributed over 258 hours and 2,616 survey acres. Since the start of the project 3,316 acres were mapped with volunteers (12,040 acres total with volunteers and refuge staff). The invasive plant surveys provided valuable information on early detection which allowed the Refuge to treat a total of 965.7 acres of invasive species. Almost a fourth of this area was concentrated on the management of McCartney rose. Another large portion, of all control measures, focused on Johnson grass and King Ranch bluestem. Most of the grasses were primarily treated along roads, but for other species, such as McCartney rose and Chinese tallow, management methods required traveling out into the field. Despite the effectiveness of most efforts at controlling these plants, their hardiness and invasive tendencies make it necessary to constantly monitor the entire Refuge for future growths, as well as the appearance of new species.
Total Number of Acres Treated with Follow-up Funding: 0 (965.7 with additional funding)
Total Number of Acres Restored with Follow-up Funding: 0 (772 with additional funding)
Total Number of Volunteers Engaged in Treatment and/or Restoration: 6


How has this Project Benefited Invasive Species Management Efforts at Your Station? This project has helped give the refuge a tool to begin the process of tracking the spread of invasive species on U.S. Fish and Wildlife Service lands. It has also provided a foundation and direction for prioritization of future treatments of infestations especially when it comes to early detection and eradication.
What are some of the Lessons Learned and/or Troubleshooting Points that could be Shared with Others Engaged in Similar Activity?


- Return to Main Menu -