invasive aquatic species in texas: an overview dr. earl ... · texas: an overview dr. earl chilton...
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Invasive Aquatic Species in Texas: An Overview
Dr. Earl Chilton II
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• Project Leader for grass carp research
mandated by Texas Legislature
• Developed grass carp permitting program
• Administered Texas’ AIS program
• Wrote Texas Comprehensive AIS
Management Plan and Guidance Document
• Represented Texas on three Regional
Panels
• Served two terms on federal Invasive
Species Advisory Committee
Earl Chilton in Texas
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Invasive Animals
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Zebra Mussels in Texas
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First Confirmed in
Lake Texoma
(2009)
Zebra mussel Dreissena polymorpha
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Apple snail
Pomacea
insularum
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Sulphur River below
Wright Patman
• Bighead carp first
reported summer
2009
• No barriers exist
between Wright
Patman dam and
Red River
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Suckermouth Catfish
• Family: Loricariidae
• Origin: South America
• Affected TX water
bodies/regions:
Central and south TX
• Ecosystem impacts:
Dietary overlap; Shore
line degradation;
Increased turbidity
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Invasive Plants
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Hydrilla verticillataApproximately 110
public water bodies
45,000 – 80,000
acres, 14
watersheds
Hydrilla
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Hydrilla in Lake Austin
Triploid grass carp stocked:
2003-2010 16,200
2011 13,200
2012 17,369
2013 9,000
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Lake Conroe Hydrilla acreage
1996-2008
0
500
1000
1500
2000
2500
Acre
s
1996 1998 2001 2003 2005 2006
July
2007
Mar
2007
July
2008
Jan
2008
May
Date
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Giant Salvinia Herbicide Treatments
Treated FY16-FY17
• Caddo Lake – 13,606
• Sam Rayburn – 7,914
• Toledo Bend – 7,460
• B.A. Steinhagen – 4,314*
• Lake Texana – 2,175*
• Lake Murvaul - 375
• Lake Striker - 178
• Sheldon Reservoir – 84
• Lake Fork - 82
• Clear Creek - 77
• Lake Timpson – 50
• Lake Naconiche – 15
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Salvinia molesta
Giant salviniaCurrent Status
20 lakes infested
4 new infestations
5 lakes eradicated
Acres treated
FY16-FY17 – 36,383Toledo Bend
Caddo Lake
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Giant salvinia and Caddo Lake
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Giant salvinia and Toledo Bend
Reservoir
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Water hyacinth
Eichhornia
crassipesApproximately 47 public
water bodies
6,000 - 14,000 acres
FY 16-17 8,989 acres
treated
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Water hyacinth hot spotsReservoirs
• B.A. Steinhagen
• Lake Corpus Christi
• Lake Texana
• Choke Canyon Reservoir
• Lake Fork
• Lake Houston
• Mountain Creek Reservoir
• Lake Monticello
• Lake Gonzales (H-4)
• Lake LBJ
• Lake Raven
• Sheldon Reservoir
• Elm Lake
• 40-Acre Lake
• Cow Bayou
• Adams Bayou
• Taylor Bayou
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Rio Grande
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Herbicide TreatmentsCrested Floating Heart
• Caddo Lake – 33 acres*
• Canals near Beaumont
Yellow Floating Heart
• Moss Lake - 24 acres
• Toledo Bend LA side
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Homeland Security News Wire:
“Densely packed and growing to 30 foot heights, the
cane provide cover for illegal activities, including
human and drug smuggling”
January 5, 2012
Arundo donax
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Giant reed Evapotranspiration
versus Native vegetation
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
Native Arundo
Ac
re-f
t
Annual Water Use
Data from California Invasive Plant Council, 2011
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Texas Program Budget
FY 2011 $1.7 million
FY 2012 $0.6 million
FY 2013 $0.6 million
FY 2014 $1.3 million
FY 2015 $1.3 million
FY 2016 $2.5 million
FY 2017 $2.5 million
FY 2018 $3.2 million
FY 2019 $3.2 million
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AIS in Texas
• Effective Management would cost $45 million annually
• Rider 34 allotted $6.4 million to Inland Fisheries (about 7% of what is needed)
• Increase AIS control efforts
• Increase biocontrol use
• Increase research
• Increase outreach
• Increase ability work with partners
• Increase FTEs within Inland Fisheries Division
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Outreach
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Other AIS Issues
Development of an Approved list rather
than a Prohibited list
Water spinach permitting
Exxon/Mobil and Biofuel
Arundo Biocontrol Development
Saltcedar (Tamarix spp.)
Elephant ear (Colocasia esculenta)
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Thank
You!
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Lionfish
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Tiger Prawn
• Found in 60-100 feet of water
• Eat small clams and mussels
• Carry 16 known diseases
• Diseases are transferrable to
crabs, crayfish, and other
shrimp
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July 7, 2012
Post-Treatment Results
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Llano River
Chinaberry Giant reed
Elephant ear
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Alternanthera
philoxeroides
Approximately 26
water bodies
1,000 - 2,000 acres,
8 watersheds
Photo courtesy of Center for
Aquatic and Invasive Plants.
Alligatorweed
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Myriophyllum
Spicatum
Approximately 18
water bodies
3,000 - 6,000 acres,
7 watersheds
Eurasian watermilfoil
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Day Lake east of Houston
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B.A. Steinhagen Reservoir
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0
1000
2000
3000
4000
5000
6000
7000
8000
Ac
res
1975 1976 1977 1978 1979 1980 1981 1982 1983
Date
Hydrilla in Lake Conroe in
1975-1983
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Lake Conroe Nursery