center for environmental research at hornsby bend...grapevines much taller and thicker than those in...
TRANSCRIPT
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Center for Environmental Research at Hornsby Bend
MISSION
Urban Ecology and Sustainability
• Community
• Education
• Research
PARTNERS
• Austin Water Utility
• University of Texas
• Texas A&M University
RESEARCH AREAS
• Soil Ecology, Sewage Recycling and Reuse
• Hydrogeology of the Alluvial Aquifer
• Riparian Ecology and Restoration
• Avian Ecology
Kevin M. Anderson, Ph.D, Coordinator
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Center for Environmental Research at Hornsby Bend
RESEARCH AREA
• Soil Ecology, Sewage Recycling and Reuse
RESEARCH AREA
• Hydrogeology of the River and Alluvial Aquifer
RESEARCH AREA
• Avian Ecology
Dr. Bayani Cardenas
and Dr. Jack Sharp
RESEARCH AREA
• Riparian Ecology and Restoration
AWU‐CER Research Programs
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AWU‐CER Lunchtime LecturesJanuary – April 2011
Each talk begins AT NOON Waller Center
[625 East 10th Street –
between I‐35 and Red River] Room 104
The 1st
Wednesday of the Month! Free and Open to the Public – bring a lunch and learn
Austin and the Colorado River Corridor
We begin 2011 by exploring the ecology and geography of the Colorado River Corridor. The first four Lunchtime Lectures focus
on different aspects of the Colorado River – ecological, cultural, historical, and biological.
Wednesday, January 5The Forgotten Habitat: the Biogeography of the Colorado River Bottomlands
Wednesday, February 2Changes in the Land: The Cultural Landscape of the Colorado River Corridor
Wednesday, March 2Discovering the Colorado: The Austin‐Bastrop River Corridor Partnership 2003‐2011
Wednesday, April 6The Nature of the River: The Flora and Fauna of the Colorado River Corridor
Center for Environmental Research at Hornsby Bend
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The Nature of the River: The Flora and Fauna of the Colorado River Corridor
Kevin M. Anderson, Coordinator
Austin Water ‐
Center for Environmental Research
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The Colorado River Basin
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Ecotone
Scrub Jays meet Blue Jays
Ashe Juniper meets Eastern Red Cedar
Central Flyway
For North
American
Birds
Austin
Migration
Biodiversity
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Alleged Texas gator killer boasted on Facebook
THE ASSOCIATED PRESSUpdated: 3:50
p.m.
Thursday,
March
10,
2011Published: 11:43
a.m.
Thursday,
March
10,
2011A man who boasted on Facebook
that he killed an 11½‐foot
alligator in Central Texas is a prime suspect in the illegal shooting,
Texas wildlife authorities said Thursday.
The gator's body was discovered near a creek in Bastrop County
about a week ago, said Fred Ensinger, a game warden with the
Texas Parks and Wildlife.
The alligator's size is an "anomaly," Ensinger
said, noting that it's
nearly twice as big as gators rarely seen so far from the Texas
Gulf Coast. Amos Cooper, a state alligator expert, estimated it
probably at least 20 to 30 years old and weighed between 500 to
800 pounds, given its length and girth.
"That's a big gator," said Cooper, alligator program leader at the
J.D. Murphree
Wildlife Management Area in Port Arthur. Cooper
said there are hundreds of thousands of alligators in Texas'
coastal areas. He said he has seen some as large as 13 or 14 feet
in his 24 years on the job.
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Anguilla rostrataAmerican Eel
Lepisosteus
oculatusSpotted Gar
Fishes of Texas
(University of Texas – Texas Natural Science Center
http://www.fishesoftexas.org/about
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River Otter
Lutra
canadensis
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[Brief] Environmental History
of the
Austin - Bastrop River Corridor
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In April 1709, two Franciscan priests and 15 soldiers cam
from the Rio Grande all the way to the Colorado looking
for a delegation of Tejas
Indians they never found…it is
probable that they camped not far above the Hornsby
Bend of the Colorado in Eastern Travis County.
“We came to the river, which has a guard on either side
of luxuriant trees, nut trees [nogales], ash trees, poplars
[cottonwood], elms, willows, mulberries, and wild
grapevines much taller and thicker than those in Castile.
It has sand banks which mark how high it rises, a quarter
of a league wide. The water is of the best we have
found.”
Difficulty traveling downriver because “the monte
that
offered itself to our sight was so much that we could not
penetrate it.”
Followed buffalo trails along the upland
post oaks.
The Overlooked Entrada: The Espinosa‐Olivares‐Aguirre Expedition of 1709
By Anibal
Gonzalez [Sayersville
Historical Association Bulletin]
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The Bottomland Forest
El Monte Grande (del Diablo!)
Early Spanish accounts of the Colorado
Monte – a sizable almost impenetrable forest – a thicket
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Settlement begins 1820’s along river corridor
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The Forgotten Bottomland Forest
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Colorado River Biodiversity
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Citizen River Monitoring
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Austin Youth River WatchAustin Secondary
School students
monitoring water
quality in Austin’s
waterways
After‐school “stay in
school”
program for
at‐risk students
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Sites monitored:
Town Lake @ Redbud IsleBarton Creek below Barton SpringsTown Lake @ 2.5 mile marker on Hike and Bike TrailTown Lake @ West Bouldin
CreekEast Bouldin
Creek @ Milton St. and Jovitas
RestaurantEast Bouldin
Creek @ Dawson ParkBlunn
Creek @ Blunn
Creek PreserveWaller Creek @ Waller Creek CenterWaller Creek @ Town LakeTown Lake @ Austin Youth HostelColorado River @ MontopolisLittle Walnut Creek @ Peyton Gin Rd.Colorado River @ Old Ford on Hornsby BendWilliamson Creek @ Dove Springs ParkOnion Creek @ Lower Falls, McKinney Falls State ParkWalnut Creek @ Walnut Creek Metropolitan ParkBoggy Creek @ 183Colorado River @ Little Webberville ParkColorado River @ “Big”
Webberville Park
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Austin – Bastrop River Corridor Partnership
Monthly River Monitoring Trips
Bastrop County
Monthly River Monitoring Trip
3rd
Saturday of the month
Begun April 2008
Travis County
Monthly River Monitoring Trip
1st
Saturday of the month
Begun February 2006
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Discoveries
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Bottomland Vegetation
Plant community structured by hydrology
Hydric
Soils
Image Archive of Central Texas Plantshttp://www.sbs.utexas.edu/bio406d/PlantPics_archive.htm
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Bottomland Vegetation
Above Permanent WaterlineAmerican Elm
Black Hickory
Honey Locust
Yaupon
Roughleaf
dogwood
Switchgrass
Eve’s Necklace
Eastern gamagrass
Box elder
Big bluestem
Buttonbush
Indiangrass
Green ash
Little bluestem
Baccharis
Virginia wildrye
Black willow
Texas bluegrass
Western soapberry
Purpletop
Pecan
Inland sea‐oats
Bur oak
Texas wintergrass
Cottonwood
Maximilian sunflower
Sycamore
Illinois bundleflower
Little walnut
Dogbane
False indigo
Buffalograss
Wafer ash (Hop tree)
Herbaceous mimosa
Live oak
Redbud
Mulberry
Gum Bumelia
Vertical structure –
groundcover, understory, canopy
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At Permanent Waterline, not saturated yearlong
Elder berry
Southern wildrice
(Zizaniopsis)
Buttonbush
Texas Sophora
(Eve’s Necklace)
Dwarf willow
Cattails
Sandbar willow
Switchgrass
Black willow
Horsetail (Scouring rush)
Box elder
Soft rush
Sycamore
Bulrushes
False indigo
Sedges
Roughleaf
dogwood
Bushy bluestem
Bald cypress
Smartweed
Baccharis
Cattails
Colorado River Hemp [Sesbania]
Spikerushes
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In the water, or permanently saturated:
Bald Cypress
Bulrushes
Horsetail
Soft rush
Reeds
Cattails
Spikerushes
Ludwigia
Yellow stargrass
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Types of Vegetation:ColonizersStabilizersWoody
Nonequilibrium
dynamics
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Non‐native species – are foreigners good or bad?
Elephant ear, coco yam, wild taro Colocasia
esculenta
Tobacco Tree
Nicotiana
glauca
Chinaberry
Melia
azedarach
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Native Invasive Species
Honey Mesquite (Prosopis glandulosa)
Palo Verde (Parkinsonia aculeata)
Honey Locust (Gleditsia triacanthos)
Legumes = Nitrogen Fixers
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Hackberry Celtus
sp.
‐
Early colonizer and wildlife food source
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Riverside Species
Black Willow Salix nigra
Gravel bar colonizer
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Bald Cypress Taxodium
distichum
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American Sycamore
Platanus
occidentalis
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Cottonwood
Populus
deltoides
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Box Elder –
Acer negundo
Box Elder?
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Poison ivy
Toxicodendron radicans
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Green Ash
Fraxinus
pennsylvanica
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Pecan –
Carya
illinoinensis
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Hornsby Bend
1998
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Bottomland Forest elders
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Live Oak
Quercus fusiformis
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Mulberry Morus
sp.
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American ElmUlmus americana
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Lost Palms of the Colorado
Sabal
palm
Sabal
mexicana
Palmetto
Sabel
minora
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Bur Oak –
Quercus macrocarpa
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Eastern Red Cedar
Juniperus
virginiana
Cedar, Ash Juniper
Juniperus
ashei
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Bottomland Grasses
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NOT SHADE TOLERANT
Coastal Bermuda
Cynodon
dactylon
Johnson Grass
Sorghum halepense
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Wildrye
[Elymus
virginicana]
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Bushy Bluestem
Andropogon
glomeratus
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Switch Grass
Panicum
virgatum
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Eastern Gamagrass
Tripsacum
dactyloides
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Inland Sea‐oats
Chasmanthium
latifolium
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Southern wildrice
Zizaniopsis miliacea
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Other plants
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Charismatic Megafauna
Biodiversity
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Riparian mammals
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John Holland Jenkins, Recollections of Early Texas
Writing of the 1870s
“There were two noted localities for bear near us then –
Hornsby’s Bend, twelve
miles below Austin, and the other in the Eblin
Bottom, twelve miles below Bastrop.
Although bear was abundant in these places, few hunters tried to
enter the almost
impenetrable tangle of dogwood and greenbrier, of which the dense thickets were
composed…”
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Black Bear Ursus
americanus
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Bears at Our Borders
•
Bears in Louisiana, New
Mexico, Arkansas, Oklahoma,
Mexico
•
24 confirmed sightings
•
67% sightings since 1990
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Mountain Lion
Felis
concolor
•
Description – reddish brown
to tawny
•
Tip of nose to tail males in
excess of 7 feet
•
Males 100 to 150 lbs•
Females 55‐90 lbs
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Bobcat Lynx rufus
•
Avg. 35 lbs up to 50lbs
•
Tail 6 – 12 inches
•
Spotting heavy in some light in
others
•
Distributed across Texas – density
varies
•
Populations stable
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Coyote
Canis
latrans
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Beaver
Castor canadensis
Nutria
Myocastor
coypus
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•
Raccoon found throughout state
•
Ringtail throughout Texas
excepting extreme south Texas
Raccoon Procyon
lotor
Ringtail
Bassariscus
astutus
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Nine‐banded Armadillo
Dasypus
novemcinctus
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Badger Taxidea
taxus
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River Otter
Lutra
canadensis
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Striped skunk
Spotted skunk Striped skunk
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Eastern Cottontail
Sylvilagus
floridanus
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White‐tailed Deer
Odocoileus
virginianus
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Feral Hog Sus
scrofa
Feral hogs are the most prolific large, wild mammal in North America.With adequate nutrition, a feral hog population can double in 4 months.
Explorers such as De Soto, Cortes and LaSalle brought them to the NewWorld. They have been in Texas since the 1680s and were important livestockto the early settlers, who usually allowed their animals to roam
free.
They prefer moist bottomland and are commonly found in riparian areas near rivers, creeks, streams,
lakes, ponds, marshes, bogs, swamps and sloughs. They also prefer densevegetation that conceals them and protects them from temperature
extremes.
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Birds of the River Corridor
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Pileated Woodpecker
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Bald Eagle
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Crested Caracara
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Great Horned Owl
Barred Owl
Barn Owl
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Osprey
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Red Shouldered Hawk
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Ringed Kingfisher
Green Kingfisher
Belted
Kingfisher
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Belted Kingfisher nest hole found in February 2006
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Black Bellied Whistling DuckHornsby Bend Bird Observatory
A cooperative partnership promoting
the study and understanding of birds in Central Texas
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Great Egret
Great Blue Heron
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Applause!
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Questions?
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AWU‐CER Lunchtime LecturesMay ‐
August 2011
Each talk begins AT NOON Waller Center
[625 East 10th Street –
between I‐35 and Red River] Room 104
The 1st
Wednesday of the Month! Free and Open to the Public – bring a lunch and learn
Rivers: Myth, Meaning and Culture in AmericaOver the next four months, I will put on my Cultural Geographer’s hat and draw on my English major to look at the meaning of
rivers and waterways in American and Texan literature. The four
lectures will descend in scale from an overview of American
rivers and American literature to Texas and finally to Austin. Join me for a journey down rivers through literature, the first
Wednesday of every month.
May 4 Noon‐1pmThe Myth of the River: American Rivers and American Art
June 1 Monday Noon‐1pmTexas Rivers: On the Brazos with John Graves “Goodbye to a River”
July 6 Monday Noon‐1pmTexas Rivers: On the Colorado with Roy Bedichek
“Karankaway
Country”
August 3 Monday Noon‐1pmLife On Waller Creek – The Legacy of Joseph Jones
Center for Environmental Research at Hornsby Bend
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Center for Environmental Research at Hornsby Bend
CER Monthly Activities 2011
Join us – free events – all are invited!
River Monitoring Trip‐
Travis County1st
Saturday of Every Month ‐
All
day [meet at CER 8am]
HBBO Bird Survey2nd
Saturday of Every Month
7am‐11am and 4pm‐dark
Birding Field Trip ‐
Travis Audubon Socity3rd
Saturday of Every Month 7:30am‐11am River Monitoring Trip – Bastrop County
3rd
Saturday of Every Month ‐
All day [meet at CER 8am]
Lunchtime Lecture Series
– a free monthly public lecture about different aspects of Austin’s
ecology, the 2st
Monday of the month at Waller Center 625 East 10th Street between Red River
and I‐35, Room 105 NOON‐1PM – bring a lunch and learn!
Ecological Literacy Days
– three hours of outdoor volunteer work and an hour of ecological
education on the last Saturday of every month
at Hornsby Bend [9am‐1pm]