Invasive Species - The Problem and What We Can Do About It by Phyllis Muska
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Transcript of Invasive Species - The Problem and What We Can Do About It by Phyllis Muska
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Invasive Species –
The Problem
and
What We Can Do About It
Phyllis Muska
Native Plant Society of Texas – Kerrville Chapter
January 8, 2013
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An ‘invasive species’ is a species that is:
– non-native (or alien) to the ecosystem under
consideration
– aggressive, grows outside of desired boundaries
– outcompetes the natives
– likely to cause harm to human health, the
economy, and/or the environment
Can be plants, animals, and other organisms
Primary means of invasive species introduction:
Human actions/activities
What is an invasive species?
Federal definition:
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Invasives in Texas
More than 122 non-native species, including
– 10 mammals – nutria, axis deer, feral hog
– 4 birds – European starling, English sparrow
– 7 fishes – grass carp
– 11 insects – imported fire ant, German cockroach
– 11 mollusks and crustaceans – brown mussel, brown
garden snail
– 12 aquatic plants – hydrilla, water hyacinth
– 67 terrestrial plants
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Texas Invasive Plant and Pest Council
(TIPPC)
Unified body to address the threat of
invasive species in Texas
Stakeholders/participants:
– State and federal agencies
– Conservation organizations
– Academia
– Green industry
– Public sector
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TIPPC
Focus for issues and concerns regarding exotic plants and pests
Exchange of information regarding all aspects of invasive pest
and plant biology, distribution, control and management
Awareness and understanding regarding invasives and their
control
Expert advice for various interests concerned with invasive
pests and plants
An advisory council regarding funding, research, awareness,
policy and management of invasive pests and plants
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Problem invasives in other parts of US
Great Lakes – zebra mussels, sea lamprey
Southeast – kudzu
Hawaii – Indian Mongoose
Everglades National Park – Giant Burmese Python
Over 2000 types of non-native creatures imported
legally into the US between 2000 and 2004
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Why are invasives a problem?
High control costs – over $137 billion/year in US
Loss of resources available to native species, degrading
diversity and wildlife habitat
Destruction of special habitat of imperiled species
Alter hydrological patterns, soil chemistry, moisture-holding
capacity, and erodibility
Can change fire regimes, creating greater fire hazard
Some hybridize with native plant relatives, resulting in
unnatural changes to a plant's genetic makeup
Can harbor plant pathogens that can affect both native and
non-native plants
Fauna that depend on the native species for their survival
probably will not be able to adapt to the invader
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How serious is the problem?
“On a global basis . . . the two great
destroyers of biodiversity are, first,
habitat destruction and second,
invasion by exotic species.”
E. O. Wilson
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What makes a plant potentially invasive?
Well adapted to the climate and soils of an area
High reproductive success
Grows and spreads rapidly
Favorable environmental conditions, lack of natural
predators, competitors and diseases
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Why do people choose invasive plants?
Invasives can be pretty
Easily available and inexpensive
Unaware of problems they can cause
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When is an ‘exotic’ not a problem?
Many do not cause harm to the economy, the
environment, or our health
Most ‘introduced’ species do not survive
Only about 15% of those that do survive go
on to become a problem
Well-behaved introduced species include crepe
myrtle, herbs such as Russian sage, Mexican
oregano, and rosemary
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Some invasives may take years to
become problematic
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Advantages of native plants
Native plant, animal and insect species work
together to keep a balance
Maintain diversity, avoid monocultures
Well-adapted to extremes of weather, climate
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Invasive Grasses
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Johnsongrass
Considered one of the ten most
noxious weeds in the world
Competes with crops
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King Ranch bluestem
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Bermudagrass
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“Improved” grasses
Klein grass, Dallisgrass, rescuegrass, rattail
smutgrass, and other introduced species
planted for livestock pasture
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Giant cane
Arundo donax
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Bamboo
Dense stands
that exclude
other plants
from creating an
understory
Monocultures
like this destroy
ecosystems
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Alternatives to giant cane and bamboo
Texas
pistache is an
attractive
screen with
good fall
color
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Invasive Trees and Shrubs
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Ligustrum (Japanese privet)
One of the top
terrestrial
invasives in
Central Texas
A top seller at
plant nursery
centers
Toxic leaves and
fruit
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Alternatives to ligustrum
Often chosen as an evergreen screen
Alternatives include mountain laurel, evergreen sumac,
yaupon holly and cenizo
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Nandina (Sacred bamboo)
Mistaken for a
native because it
is so pervasive in
our natural areas
Colonizes via
spreading
underground
roots
Seed dispersed by
animals
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Alternatives to nandina
Often chosen for
its reddish
foliage and red
berries
Possible
alternatives
include
possumhaw
holly and
flameleaf sumac
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Vitex
Very pretty purple
flowers
A terrible invader
of ecosystems
along creeks and
rivers
Sometimes
marketed as ‘Texas
lilac’ – but it’s not
native!
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Alternatives to vitex
Mexican bush
sage, Texas
mountain laurel,
redbud and
Mexican buckeye
are all good
alternatives with
showy blossoms
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Chinaberry
Produce hundreds of
poisonous berries
Spread by birds
Problem in riparian
areas in particular
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Alternatives to Chinaberry
Western soapberry has beautiful
fall color and berries very
similar to Chinaberry
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Chinese Tallow
Tops list of invasive plants
in the Southeastern United
States
Spread by birds and water
Changes grassland into
tallow forests
Now comprises about 40%
of the Houston tree canopy
Allowed to grow and
reproduce because of its
pretty fall color
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Alternatives to Chinese tallow
For good fall color, consider:
– Flameleaf sumac
– Texas pistache
– Texas red oak
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Ailanthus
(Tree of Heaven)
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Chinese pistache
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Mimosa (Silk tree)
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Invasive Vines
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Japanese honeysuckle
Covers and smothers
other plants
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org
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Alternatives to Japanese honeysuckle
Carolina
jessamine
Coral
honeysuckle
Cross vine
Texas wisteria
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English ivy
Covers and smothers
other plants
Randy Cyr, Greentree, Bugwood.org
James H. Miller, USDA Forest Service, Bugwood.org
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Non-native thistles
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Musk thistle
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Bull thistle
Photographer: Steve Dewey,Source: Utah State University, Bugwood.org
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Sow thistle
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Malta starthistle
Photographer: Joseph M. DiTomaso, University of California - DavisSource: Bugwood.org
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New on the scene
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Bastard cabbage
Bastard cabbage –
quickly choking out
many of our spring
wildflowers
Forms a large
rosette that
prevents other
forbs from
germinating
Pull up by roots in
spring, before it
flowers
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Brazilian vervain
Displaces native vegetation
Particularly invasive in riparian areas
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Christ thorn
Native to
Mediterranean and Asia
Particularly invasive in
riparian areas
Forms thorny thicket
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Hill Country Dirty Dozen
Glossy privet – Ligustrum lucidum
Chinese tallow – Triadica sebifera
Tree of heaven – Ailanthus altissima
Giant reed – Arundo donax
Johnsongrass – Sorghum halepense
King Ranch bluestem – Bothriochloa ischaemum var.
sangarica
Chinaberry – Melia azedarach
Japanese honeysuckle – Lonicera japonica
Heavenly bamboo – Nandina domestica
Golden raintree – Koelreuteria paniculata
Brazilian vervain – Verbena brasiliensis
Bastard cabbage – Rapistrum rugosum
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What can you do?
Choose native plants
Replace invasive plants on your property
Be alert to accidental transport of invasives via
shoes and clothing, boats, cars
Spread the word about invasive plants
Patronize nurseries specializing in natives
Ask your local nursery to stock native varieties
Share plants, but make sure you know what
you’re giving or receiving
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What Can You Do? cont’d.
Check the contents on seed mixes for invasives
Use ‘certified weed free’ soils and mulches
Dispose of invasive plants carefully – bag or burn
For potentially invasive plants that you can’t part
with, harvest and dispose of fruits and seeds
before they can spread
Join a volunteer network to help identify and
remove invasive plants from natural areas – see
http://www.texasinvasives.org for details on
Wildflower Center initiative
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The goal
Preserve and restore natural areas that
support the beautiful and diverse plants and
wildlife native to Central Texas
Prevention: $1 dollar of prevention is worth
$100,000 of the cure
Control a little now or deal with a lot later!
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Resources
Lady Bird Johnson Wildflower Center –
Texas Invasives project
http://www.texasinvasives.org/
The Global Invasive Species Initiative
http://www.issg.org/
Nonnative Invasive Plants of Southern Forests
by James H. Miller
http://www.invasive.org/eastern/srs/
Weeds Gone Wild
http://www.nps.gov/plants/alien/index.htm
Nature Conservancy’s Global Invasive Species Team:
http://www.invasive.org/gist/
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Invaders – since 2005
www.texasinvasives.org
Program developed at Lady Bird Johnson
Wildflower Center
Over 1400 citizen scientists trained
40+ satellites across the state
Over 17,000 invasive plants documented and
mapped
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Want to get involved?
Join the ‘Texas Invaders’
Go to http://texasinvasives.org
Choose ‘Citizen Science’, then
‘Become a Citizen Scientist’
Follow instructions for Voyager online training
Choose ‘Hill Country’ satellite
Begin reporting!
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Guess who’s coming to dinner?
Texas Monthly’s list of our five tastiest invasives
– Black Tiger Shrimp Penaeus monodon
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Guess who’s coming to dinner?
Texas Monthly’s list of our five tastiest invasives
– Black Tiger Shrimp Penaeus monodon
– Bastard Cabbage Rapistrum rugosum
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Guess who’s coming to dinner?
Texas Monthly’s list of our five tastiest invasives
– Black Tiger Shrimp Penaeus monodon
– Bastard Cabbage Rapistrum rugosum
– Asian Carp (grass carp) Ctenopharyngodon idella
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Guess who’s coming to dinner?
Texas Monthly’s list of our five tastiest invasives
– Black Tiger Shrimp Penaeus monodon
– Bastard Cabbage Rapistrum rugosum
– Asian Carp (grass carp) Ctenopharyngodon idella
– Nutria Myocastor coypus
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Guess who’s coming to dinner?
Texas Monthly’s list of our five tastiest invasives
– Black Tiger Shrimp Penaeus monodon
– Bastard Cabbage Rapistrum rugosum
– Asian Carp (grass carp) Ctenopharyngodon idella
– Nutria Myocastor coypus
– Feral pig Sus scrofa
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Guess who’s coming to dinner?
Do your part to control
unwelcome populations–
eat more invasive species!