Gone to Seed

Scarlet Leatherflower, Clematis texensis

Often used as an informal figure of speech meaning to deteriorate or go downhill, ‘gone to seed’ can have a negative connotation.  But each seed contains a new beginning: a tiny plant just waiting for the right conditions such as water, warmth, and a good location, to germinate and grow.  Seeds and seed heads form fascinating shapes, varying sizes, and intricate patterns, often adorning the fall and winter landscape.

Illinois Bundleflower, Desmanthus illinoensis

Inland Sea Oats, Chasmanthium latifolium

Plants have many ways of dispersing their seeds, and most have evolved over millions of years. While the methods are tried and true, certain seeds have developed in very particular ways to take advantage of such methods, and some plants only release their seeds in response to specific triggers. 

Wafer Ash, Ptelea trifoliata

Texas Milkweed, Asclepias texana

Wind helps seeds float or flutter away, often aided by seed structures such as thin wing extensions or long, feathery tails like those on the endemic Scarlet Clematis (Clematis texensis).  Texas Bluebonnets (Lupinus sp.) employ the expulsion or explosion method, where the small, pebble-like seeds are forcibly expelled when the dried pods twist open in the warm sun.  Gravity plays a part in many plants seed dispersals, where weighty seeds fall off the plant and roll to a new location.  The best example of this are the round, heavy fruits that simply fall off a plant when ripe, such as those on Mexican Plum (Prunus mexicana) or Texas Persimmon (Diospyros texana).  If the fruits have a tough outer shell, they may travel some distance from the parent plant, and if they have a soft skin, they may break open where they fall and scatter the seed or seeds within. 

Texas Persimmon, Diospyros texana

Mexican Buckeye, Ungnadia speciosa

Some plants produce very light seeds, seeds with buoyant fluff, or seeds with air trapped in them, so they can float away from the parent plant that grows in or around water, like Common Buttonbush (Cephalanthus occidentalis) or Black Willow (Salix nigra).  Others employ the assistance of animals, which can come in the form of seed or fruit eating (where the seed can pass undigested through the animal), seed caching or burying, or seed transportation.  Often unbeknownst to the animal, seeds can be covered with tiny hooks or spines that catch on a passing animal’s fur, and eventually rubbed off in another location.  Common examples include Cedar Waxwings and American Robins eating juniper and yaupon berries, both ground and tree squirrels eating and caching acorns, and many animals (including humans) that emerge from the wilds carrying the seeds of Beggarsticks (Bidens sp).    

Yaupon, Ilex vomitoria

This fall and winter, let the seeds linger! Not only do they provide much needed food for wildlife, but leaving them allows for some beautiful and mysterious patterns in your winter landscape, and the promise of renewing the cycle of life that begins again each spring!

Fields of Gold

Prairie Goldenrod, Solidago nemoralis

Cooler temperatures and shorter days mark the onset of autumn, and the golden colors of the season begin to surround us.  Among the amber and scarlet hues making an appearance in the landscape, one cannot help but notice two of our most common fall-blooming native plants: Goldeneye (Viguiera dentata) and Prairie Goldenrod (Solidago nemoralis).  

Goldeneye, Viguiera dentata

A member of the sunflower family, Goldeneye is a bushy, drought-tolerant, multi-branched plant that tends to grow in colonies, providing rich swaths of golden color along our roadsides and in open areas.  It has narrow leaves and numerous 1.5 inch daisy-like flowers at the tips of long, slender stalks.  Growing to 3 feet tall in full sun or up to 6 feet tall in partial shade, this plant is native not only to Texas but to Arizona and New Mexico as well.  It prefers relatively dry, partially shaded areas such as woodland edges and open prairies, and in Mexico is also known by the common name Chimalacate.  



The mid to late fall blooms of Goldeneye not only provide seasonal color, but provide for native wildlife as well.  Goldeneye is the larval food plant for both the Bordered Patch and Cassius Blue butterflies, and if spent flower stalks are left to stand through most of the winter, they will provide good seed forage for Lesser Goldfinches and other birds.  Infusions of this plant are still used today as an antibacterial treatment for baby rash.  


Prairie Goldenrod, Solidago nemoralis

Prairie Goldenrod, also called Gray Goldenrod, is a slender-stemmed plant 1.5 to 2 feet tall, that blooms from June through October.  A member of the aster family, it has thin, coarsely-toothed leaves and yellow flowers that are borne on the upper side of hairy stalks, arching out and downward to create a vase-shaped flower cluster.  Individual plants bloom at various times, extending the flowering season, but they are most noticeable in fall, especially when paired with purple Gayfeather and red Autumn Sage.  An excellent addition to a wildflower meadow or a sunny garden, Prairie Goldenrod is naturally found in dry, open woods and upland prairies, and does well in full sun to part shade. A carefree plant, it can become invasive if left alone, but is also easily controlled.  



Of special value to bees and butterflies for its pollen and nectar, and to several species of finches for its seeds, Prairie Goldenrod was also used by Native Americans to treat jaundice and kidney disorders, and as a wash for burns and skin ulcers.  The Navajo burned the leaves as incense, and used the seeds for food.

As you wander along roadways and pathways this fall, admire these fields of gold that delight not only our senses, but provide a bountiful harvest for our wild neighbors as well!

Blues of Summer

Marine Blue (Leptotes marina)

The gossamer-winged butterflies (or Lycaenidae) are a large family of small butterflies that include the coppers, hairstreaks, and blues.  Usually noticed when flying erratically in an up-and-down fluttering motion, they bask in the sun with their wings open, and when perched sit with their wings closed, often rubbing their hind wings together.  The blues are especially small with a wingspan of about one inch, and while mostly blue above, the identifying field marks are found mainly on the undersides of their wings.  In Central Texas, the most commonly seen blues in open, sunny habitats are the Eastern Tailed-blue, Marine Blue, and Reakirt’s Blue.

Eastern Tailed-blues (Cupido comyntas)

Eastern Tailed-blues (Cupido comyntas) are common and can be identified by the one to three orange spots near the tail on the underside of the hind wing.  The males are deep blue on their uppersides while the females are a lighter blue to brown.  They occur in the eastern half of the United States from the coast to the Great Plains.

Marine Blue (Leptotes marina)

Marine Blue (Leptotes marina)

The Marine Blue (Leptotes marina) is a fast flier (for a blue) and is found from Texas west to Southern California and south to Mexico.  Its’ underside is strongly striped gray-brown often with a pale purple fringe.  The male has a blue upperside with a strong purple overlay, while the female has a brown upperside with some blue at the base of the wings.

Reakirt's Blue (Echinargus isola)

Reakirt's Blue (Echinargus isola) - male

Reakirt's Blue (Echinargus isola) - female

While the other blues fly mostly spring to fall, Reakirt’s Blue (Echinargus isola) flies year round in Texas.  The males are lavender-blue above while the females are primarily gray-brown with a touch of blue basally, and they are identified by the conspicuous row of five white-ringed black spots on the underside of their forewings.

Western Pygmy-Blue (Brephidium exilis)

Ceraunus Blue (Hemiargus ceraunus)

Cassius Blue (Leptotes cassius)

Other species that are not common in our area but can sometimes be found include Western Pygmy Blue (Brephidium exilis), Ceraunus Blue (Hemiargus ceraunus), and Cassius Blue (Leptotes cassius). With a wingspan of about half an inch with coppery brown on the underside, the Western Pygmy Blue is the smallest butterfly in North America. Ceraunus Blue and Cassius Blue both have a wingspan of about one inch, and have two submarginal eyespots on the underside of the hindwing (in Florida, the Ceraunus has only one eyespot). They can be distinguished from each other by the patterns on their undersides, with the Ceraunus having a row of dark postmedian dashes on a gray background, and the Cassius having broken pale lines with some white or 'blank' spots on a tan background.

Most of these blues utilize legumes as their larval food plants, so you can often see them flying around plants in this family, including alfalfa, mesquite, clover, dalea, mimosa, and indigo species. The caterpillars of these butterflies are slug-shaped, somewhat flattened, and are often tended to by ants, which feed on the sweet liquids secreted by the larvae and in turn protect the larvae from other predators.  As adult butterflies, they feed on nectar from a variety of herbs found flowering in grasslands, fields, meadows, and along creeksides.

Interestingly, these blues are part of a group of butterflies called the Polyommatus blues, originally studied by the self-taught butterfly expert and famous mid-twentieth century novelist Vladimir Nabokov, who hypothesized that they arrived in the New World from Asia in waves over millions of years.  While few professional scientists took his ideas seriously at the time, recent DNA and gene-sequencing technology has proved him absolutely correct – that this group of butterflies originated in Asia, moved over the Bering Strait at a time when the land was relatively warm 10 million years ago, and eventually headed south all the way to Chile!

Mysterious Migration

Wandering Glider, Pantala flavescens

Fall migration season is upon us, and that usually conjures up thoughts of songbirds and hawks using the central flyway through Texas to make their way south to the subtropics and tropics for the winter.  However, birds are not the only ones who migrate, and while much has been said about the complex, annual migration made by Monarch butterflies, the record for the longest insect migration (twice the distance of the Monarch) belongs to a dragonfly species, the Wandering Glider (Pantala flavescens).  In fact, dragonfly migration has been suspected for over 100 years, and up to 50 of the world's 5,200 dragonfly species are thought to migrate (about 16 out of 326 in North America), but not much is known about where they are coming from or where they are going.  

Green Darner, Anax junius

In Texas, there are several species of dragonflies that migrate in addition to the Wandering Glider. They include the Common Green Darner (Anax junius), Black Saddlebags (Tramea lacerata), Variegated Meadowhawk (Sympetrum corruptum), and Spot-winged Glider (Pantala hymenaea).   Cooler nights seem to trigger the dragonflies' journey south, and like birds, they build up their fat reserves before setting out.  They may use the lay of the land as a navigation guide, and some scientists speculate that they have an internal magnetic compass, as those that fly off course and out to sea appear to realize their mistake and reorient themselves.  

Black Saddlebags, Tramea lacerata

Dragonflies migrate during daylight hours, and green darners have been found to break their journeys every three days to rest and feed, using oak and juniper trees as stopover sites.  Like monarchs, the full migration circuit takes multiple generations to complete, as it is the offspring of the generation that traveled south in the fall that is migrating north again in the spring.  

Variegated Meadowhawk, Sympetrum corruptum

Swarms of dragonflies can create one of nature's most impressive spectacles, with tens to hundreds of thousands of individuals streaming southward along lakeshores, mountain ridges, and coastlines.  Even with the origins and destinations poorly known, the migration in the fall is more noticeable than that in the spring, presumably because the spring event occurs over a wider front and a longer period of time.  However, migration is the only explanation for how dragonfly adults appear in early spring in places where their nymphs or larvae from the previous year or years have not yet emerged.

Spot-winged Glider, Pantala hymenaea

The ecological role of migrating dragonflies is another facet of the mystery yet to be resolved. Since several species use the same migration strategies and timing as migratory birds, traveling at the same times and concentrating in the same places, it is likely that certain bird species are exploiting the abundance of dragonflies as a source of fuel for their own migration.  More research is being done to solve these mysteries, most notably the Xerces Society’s Migratory Dragonfly Partnership initiative, which uses “research, citizen science, education, and outreach to understand North American dragonfly migration and promote conservation.”    

Traveling Tarantulas

Tarantula

Relatively common throughout Texas, the Tarantula (Aphonopelma sp.) is Texas’ heaviest and largest spider.  Typically, the head and legs are dark brown, and the abdomen is brownish-black. Coloration varies between individuals as well as between the 14 different species found in Texas. Identification of individual species is difficult, however, and is often performed only on mature males under a microscope.

Tarantulas are typically found in grasslands and semi-open areas, and use burrows, natural cavities under stones or fallen logs, spaces under loose tree bark, and even old rodent holes as shelters.  They are also capable of digging their own burrows, and often line them with webbing, placing a few strands across the front to help detect passing prey.  Laying several hundred eggs in a hammock-like web constructed inside the burrow, females will guard them until they hatch. Females have lived in captivity for over 25 years, while males rarely live over two or three months after reaching maturity.   

Like many animals, tarantulas molt their exoskeletons several times as they grow.  The skin on the hard upper shell and abdomen splits, and the tarantula begins the process of squeezing through the opening.  Most of the time, tarantulas molt while positioned on their backs, twitching, stretching, and kicking until the entire exoskeleton has been cast off.  After they have wriggled free of their old skin, this discarded exoskeleton is a perfect replica of the spider, minus its head and fangs. 

Other insects such as crickets, beetles, grasshoppers, cicadas, and caterpillars form the basic diet of the tarantula.  They inject their prey with a poison when they bite, which liquefies the prey’s insides, making it easier to ingest.  While they can climb, they are usually restricted to the ground, where the majority of their prey is found.  The hairiness and large size of tarantulas often evokes concern, but the bites of Texas species are not serious to humans.  Tarantulas maneuver quickly to face whatever disturbs them, often raising up on their hind legs and stretching out their front legs in a threatening posture.  They have also been observed rapidly brushing the top of their abdomen with their hind legs to dislodge hairs that can be used to irritate the attacker’s eyes or skin.

For a few weeks late in the summer or early fall, one of the most spectacular spider events occurs in Texas.  Not well understood, this phenomenon is often called a migration, but it may be related more to mating rather than seasonally motivated movement.  Males actively wander to seek out females, and can travel 50 miles in search of a mate.  Populations seem to follow a boom and bust cycle, depending on weather patterns and the availability of food, but a good year can be a sight to behold if summer rains have been plentiful.  While the males are out searching, females wait in their burrows for a suitor to appear.  Larger and more robust, the female does not always accept any male that comes along, and will kill and eat males that are deemed unsuitable. 

Tarantula Hawk

As formidable as they may seem, tarantulas are not without their own enemies.  In fact, in late spring and early summer they are routinely hunted by female Tarantula Hawks as food for their larvae.  Belonging to a group of spider wasps in the genera Pepis and Hemipepsis, tarantula hawks are large, 2-inch long wasps with iridescent blue-black bodies and bright, rust-colored wings.  This vivid color combination is a form of aposematism or warning coloration, a type of advertising signal to both predator and prey that these species are potentially harmful.  These wasps have the ability to deliver a powerful sting, and their long legs have hooked claws for grappling their victims.  

Flying low over the ground, the female tarantula hawk will find a tarantula and sting it, which paralyzes the spider but does not kill it.  She then drags the inert tarantula into her burrow or transports it to a specially prepared nest, where she lays a single egg on the spider’s abdomen, then seals the opening to the burrow as she leaves.  When the wasp larva hatches, it creates a small hole and enters the spider’s abdomen, where it feeds voraciously, avoiding vital organs to keep the spider alive as long as possible.  After several weeks the spider dies, the larva pupates, and then it emerges from the spider’s abdomen to continue its lifecycle.

Keep Austin Wild

Golden-cheeked Warbler

As Austin and surrounding areas grow and expand, encounters with urban wildlife become increasingly frequent, especially during the spring and summer breeding seasons.

Wild animals often make their homes in or around our homes, and they can be unwelcome and even destructive.  Be aware that trapping is not always the answer, and should only be used as a last resort.  Unless the source of the problem is eliminated (uncapped chimneys, holes in decks or attics, pet food left outside), another animal will likely move into the same spot.  Additionally, during spring and summer, you may trap a mother whose babies will be left orphaned if she is removed.

Eastern Cottontail

Trapping is also quite stressful for animals, and they often injure themselves when trying to escape.  They can be exposed to the elements and left trapped for an unknown number of hours or days, without food or water.  If they are relocated, they may have trouble finding food, water, or shelter, as they will be disoriented in their new environment.  They can also be considered intruders by the resident animal population, and be driven away or attacked, with a very uncertain outcome.

Nine-banded Armadillo

To avoid all of these situations, there are humane solutions to prevent common wildlife problems before they occur.  These include installing L-shaped mesh barriers under decks, sheds, and around gardens, adding bungee cords to trash can lids or keeping the cans inside the garage until collection day, capping the top of the chimney, installing mesh covered attic vents, taking pet food indoors overnight, and adding squirrel-proof baffles to bird feeders.

Coyote

If you do run across wildlife babies, remember that they cannot digest cow’s milk properly, so they should be brought to Wildlife Rescue as soon as possible.  Fawns are often left alone and curled up in the grass for up to 10-12 hours while their mothers forage, so if their mouth is warm, bottom is clean, and they are not being overrun by fire ants, leave them alone.  Young feathered birds are frequently found on the ground and belong there, as it is natural for them to fledge the nest and learn to fly, feed, and avoid predators, all under the watchful eyes of their parents, who are likely nearby.  Unfeathered baby birds can be safely united with their parents by creating a makeshift nest, nailing a small plastic bowl as high as you can reach onto a tree, first poking a few small drain holes in the bottom, adding some dry grass or leaves, and placing the nestlings in it.  Within a few hours, the parents should return to resume feeding them.

Recently, the National Wildlife Federation ranked America’s largest cities based on three criteria for wildlife: percentage of parkland, citizen action to create wildlife habitat, and school adoption of outdoor learning in wildlife gardens.  Austin, Texas was named as “the clear-cut (#1) choice as America’s best city for wildlife, boasting the most Certified Wildlife Habitats (2,154), most certified Wildlife Habitats per capita, and most Schoolyard Habitats (67).  Famous for its Congress Avenue Bridge that’s home to 1.5 million bats, the City of Austin is certified as a Community Wildlife Habitat.  Its residents not only want to Keep Austin Weird – they’re the best in America at keeping their city wild.”

Black-capped Vireo nest

However, as more and more of our landscape is bulldozed and developed, we leave less and less for the native animals that call it home.  The least we can do is be cognizant of these changes, prevent conflicts when possible, and learn to treat our native wildlife as humanely as possible! 

Serious About Salamanders

Jollyville Plateau Salamander

Humans often wonder why efforts are made to protect biodiversity and save endangered species.  Biodiversity is defined as the variety of life in the world or in a particular habitat or ecosystem, and preserving it provides us with tremendous and vital benefits.  Among others, these benefits include air purification, medicines for better health, fresh water, pollination of crops, carbon sequestration (or storage), and preserving the fertility of the soil. 

Forests purify our air by filtering particulates and regulating the composition of the atmosphere. They act as massive carbon reservoirs, essential to the Earth’s global carbon cycle, and significantly contribute to regulating the global climate. Natural forest soils, with their active microbial and animal populations, have a higher content of total nutrients and biomass, supplying the right nutrients to plants in the right proportions.  Soils and wetlands also act as a filter for water, helping to reduce nitrogen loading, which is a significant form of pollution that occurs as a side effect of development in many parts of the world.  

Roughly 50% of the medicines currently available are derived from natural products.  Of these, at least 120 chemical compounds derived from 90 different plant species are critically important drugs in use around the world today.  Many flowering plants rely on a great variety of animals to pollinate them, including one third of the world’s food crops.  In the U.S., it has been estimated that honeybees alone pollinate approximately $10 billion worth of crops.    

Recently, the U.S. Fish and Wildlife Service protected the Austin Blind Salamander (Eurycea waterlooensis), and the Jollyville Plateau Salamander (Eurycea tonkawae) in addition to a total of 4,451 acres of critical habitat.  These salamanders live no where else in the world, and saving them is also an important step for our region’s long-term water quality and health.  They cannot survive in waterways polluted with pesticides, industrial chemicals, and other toxins, so they are excellent indicators of the health of the environment.

Austin Blind Salamander

The Austin Blind Salamander has external feathery gills, a pronounced extension of the snout, no external eyes, and weakly developed tail fins.  It occurs in and around Barton Springs, which is fed by the Barton Springs segment of the Edwards Aquifer.  The conditions that threaten this species include degradation of its aquatic habitat from pesticides and fertilizers, as well as low flow conditions in the aquifer and the springs.  The Jollyville Plateau Salamander is physically similar to the Austin Blind Salamander, but has generally well-developed eyes, except for some cave-dwelling forms that exhibit eye reduction, head flattening, and loss of color.  Typically, their habitat is spring-fed, and they occur in depths of less than one foot of cool, well-oxygenated water.  While this salamander lives in the Jollyville Plateau and Brushy Creek areas, significant population declines have been observed, likely as a result of degrading water quality from rapid urban development. 

Perhaps one of the most fundamental benefits of saving endangered species is an aesthetic one, as the loss of biodiversity impoverishes our world of natural beauty, both for ourselves and for future generations.  It is yet another good reason for us to be serious about salamanders!