Dr. Ray Buchanan holds up Invaders of Texas: Volunteer Handbook, used as part of a citizen science program to detect and report invasive species in Texas. |
Every Thursday, my 19
fellow classmates and I travel to unique and special sites in Central Texas,
like Westcave Preserve and Inks Lake State Park. For our naturalist training,
I’ve driven as far as 80 miles to Doeskin Ranch in Travis County.
Not this week. Lucky me–I
had just a mile commute to the Blanco United Methodist Church for classroom instruction.
The day also included a hike and lunch at Blanco State Park.
Week eight of our Texas Master Naturalist training with the Highland Lakes chapter covered invasive plants and entomology.
Dr. Ray Buchanan, a past
president and Highland Lakes chapter member, presented our first class on
invasives, which was held in the church’s fellowship hall.
“What are the various ways
we identify plants?” he began. “By scientific name. What they are when they
mature–shrub, tree, vine. How long they live–perennial or annual. We identify
them by their leaves–deciduous or evergreen. We group them by vegetative zones.
Are they deer resistant? Do they attract hummingbirds or butterflies?”
“But invasive…what does
that term exactly mean?” Buchanan asked. His question got us to thinking.
Various Texas gardening and
field-guide books published from 1987 up to 2006 don’t directly address
invasives, he continued, holding up some examples. “So they don’t give us a lot
of help,” he said. “Are corn, oat and tomato plants invasives?”
No.
If a plant’s invasive, that
seems to imply that it’s bad in some way. “The seeds of mountain laurels are
toxic. Does that make the mountain laurel invasive?”
No.
According to Buchanan, the
definition of an invasive means that the species:
· Does economic harm
(destroys crops)
· Harms the environment
(destroys wildlife habitat and creates monocultures)
· Harms human health and
productive land management
“But how do invasives do
all that–that’s my question,” Buchanan said. “They’re fast growing and fast
spreading. They have if, if any, insect predators or diseases. So they survive,
and they survive well. They smother new shoots of native plants and may exude
toxic ‘allelopathic’ chemicals that can harm livestock or humans. Their
structure helps them survive and thrive. They spread by seeds, runners and rhizomes.
They may have extended growing seasons and climb on other plants.
“The key to a healthy
ecosystem is biodiversity,” Buchanan said. “Our native plants have adapted to
our soils and climate. We need our
natives for biodiversity.”
What can we do as Master
Naturalists?
“First, we must recognize
that there’s a problem,” Buchanan said. “Secondly, because invasives don’t have
boundaries, we must talk to our neighbors and our community. We’ve got to start
at our borderlands and work inwardly. We must be persistent in the fight and
focus on our own properties.”
After Buchanan finished his presentation, he talked about specific invasive species that threaten the Texas Hill Country.
Janis examines a chinaberry branch. |
Connie, a Master Naturalist with our Highland Lakes chapter, showed us a Johnson grass stem. The huge white stripe down the stem characterizes Johnson grass. |
Connie shows Ed some nandina foliage. |
We split into four teams and headed out. Judy, Joy, Ed and Kevin found our first: wax-leaf ligustrum. |
M.J. kept track of our finds. |
Judy and Ed found another species: Japanese honeysuckle. |
Ed found the chinaberry tree. |
Judy examined the chinaberry while M.J. noted the find. |
The hike along the Ira Caswell Nature trail parallels the Blanco River part of the way. |
After our hike, we enjoy picnic lunches at the Big Table (built by the Civilian Conservation Corps in the 1930s) that overlook the river. |
After lunch, Kim Bacon–also
a member of our Highland Lakes chapter–spoke on entomology, which is the study
of insects. “As a Master Naturalist, you need to be curious and look into
things,” she started. “Ask what’s that and what’s it doing?”
During her hour-long
presentation, she next gave a brief overview of taxonomy, basic insect anatomy, and
metamorphosis (complete versus incomplete).
Bacon showed us the tools she uses in the field, like a camera, magnifying glasses, collection containers and this device, which sucks up insect specimens like a vacuum cleaner. |
More than 40 years later, she still uses a press she made as a kid for preserving plant specimens. |
Tom examines a beetle collection pinned and documented by Bacon. |
[After class, Bacon told me
that she recognized me…because she runs the Texas Bee Watchers website, and in
February 2011, she bee-certified our Wildscape (#12). Among the
photos of our Wildscape was one of me, which is how she recognized me. (Great
memory, Kim!)]
Master Naturalist Billy Hutson smiles for the camera with his beekeeper's suit. |
After Bacon talked, Master
Naturalist Billy Hutson spoke on beekeeping, a hobby he got into back in the
1970s. "Bees are not native, but they fill a niche," he told us.
In a nutshell, we learned
that: Queen bees live solely on royal jelly, produced by worker bees. Her only
job is to lay 2,000 or so eggs a day. "So that's all she does: eat, poop
and lay eggs," Hutson said. As a whole, a bee colony, which consists of a
queen, many workers and a few drones (males), operates as one super organism.
Anywhere from two to seven years of age, a queen bee gives off certain
pheromones that tell workers that she's nearing death so they must nurture new
queen bees. Out of five to 10 new queens, one will emerge first and then
destroy the other queens. She will serve as the colony’s new queen until her
life ends.
Hutson passed around frames from his bee hives, which intrigued Janis and Kay. |
After finishing his talk, Hutson sliced up bite-sized pieces of cornbread and topped them with his honey so we could taste it. Hmm, delicious! |
NEXT WEEK
Our class curriculum takes us to Pedernales Falls State Park, where we'll have a session on bird watching at the park's bird blind. We'll also learn about the birds and herps that live in the Texas Hill Country.
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