dragonflies

Walden West ~ June & July

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Walden West ~ A hidden vernal pool

Thanks to the unexpected loss of transportation I’ve written of elsewhere, my June visit to the spot I call Walden West was significantly delayed. Arriving nearly at the month’s end, I found oppressive heat, swarming mosquitos, biting flies, and a dearth of blooms: a combination that quickly enough persuaded me to shorten my visit. Instead, I returned twice in July, combining June and July’s offerings into a single entry.

Over time, I’ve come to recognize the ‘pond’ at Walden West as a vernal pool: a small wetland with a seasonal cycle of flooding and drying. Some vernal pools flood in spring, due to melting snow, rain, or high groundwater, before drying by summer’s end. Others fill with rain in autumn, hold water through winter and spring, and then dry by late summer. In either case, the cycle of filling and drying makes them unique among wetlands, and plays a key role in determining which creatures can be found there.

By the end of June, heat and lack of rain had dried Walden West, leaving its depression filled with the dark, matted leaves typical of vernal pools. That said, some moisture remained, encouraging new growth. Mature hackberry trees in the area provided seed for their next generation. As for the shrub known as Groundsel Tree (or Eastern Baccharis), its fluffy white seeds can travel some distance; the seedling I found could have arrived from anywhere in the general neighborhood.

Hackberry seedling ~ possibly Celtis laevigata
Groundsel tree ~ Baccharis halimifolia

Despite the lack of surface water, dragonflies were everywhere: no doubt drawn to the area by those bothersome mosquitoes. This female Four-spotted Pennant (Brachymesia gravida ) had perched in what’s known as the obelisk posture: a handstand-like position created by raising the abdomen until its tip points at the sun. With the surface area exposed to solar radiation minimized, overheating is less likely.

Another common dragonfly, this female Eastern Pondhawk (Erythemis simplicicollis) paused from hunting to show off her beautiful colors atop a plantain stem.

A few damselflies flitted near the ground. One tiny, inch-long creature may have been an Eastern Forktail ((Ischnura verticalis) given its splendid green eyes, the pigmented area on the back of its eye (called an ‘eyespot’), and the solid green stripe along its thorax.

Fragile Forktails (Ischnura posita) are similar, although the male’s black thorax is marked with broken green shoulder stripes that resemble exclamation marks. Whatever the species, this was the smallest damselfly I’d ever encountered. Both Fragile and Eastern Forktails can be found in a wide variety of wetlands, including vernal pools.

Forktail damselfly (Ischnura spp.)

For insects seeking pollen or nectar, drought-tolerant choices were available. Hundreds — perhaps even thousands — of brilliant red Turk’s Caps (Malvaviscus arboreus var. drummondii) filled the woods. These shade-loving plants bloom from May until November; their small, edible apple-like fruits develop in tandem with newly-formed flowers. Turk’s Caps bloom most abundantly during summer heat, so July was a perfect time to find them.

The plant’s scientific name honors Scottish naturalist Thomas Drummond, who spent about two years collecting plants in the region of the Colorado, Guadalupe, and Brazoria Rivers. Since Walden West lies in Brazoria County, Drummond might well have seen the Turk’s Caps as he passed through.

His name also has been attached to about a dozen plant species, the moss genus Drummondia, and one mammal: the wood-rat Neotoma cinerea drummondii.

Unlike most members of the mallow family, Turk’s Cap flowers never fully unfurl. Instead, as the stigma develops, it extends above the petals: an open invitation to passing pollinators.

Another member of the Mallow family, the hisbiscus-like Salt-marsh Mallow (Kosteletzkya virginica) was equally abundant along the roads leading to Walden West.

A sun-lover, it doesn’t find the area around the pond especially congenial, but this single flower had found a bright spot in which to bloom.

Yet another mallow already was past its prime. The structurally attractive seed heads of the Swamp Rose Mallow (Hibiscus moscheutos) were scattered about, but I had to turn to my archives to find an image of one blooming at the edge of a creek that runs through the refuge. At times, their flowers are pink rather than white; I’ve seen only one plant with pink blooms, and that was in east Texas.

Swamp Rose Mallow seed head
Swamp Rose Mallow Flower ~ Hibiscus moscheutos

Other signs of a turning season were visible, including this nearly-dried stem of Virginia Wildrye (Elymus virginicus)…

and a few remaining fruits on dwarf palmettos. In time, the fully-ripened fruits will blacken, but eager creatures already seem to have been nibbling away.

Dwarf palmetto fruits

While there may have been Monarch butterflies in the neighborhood, I saw only Queens and Viceroys. Queen butterflies can be identified by the white spots on their wings; Viceroys have a dark, horizontal line paralleling their wings’ edge.

Queen butterfly on a late season Greenthread
Queen butterfly on Mexican Hat
Viceroy butterfly just hanging out on a branch

On this trip, huge spider webs decorated the woods, crossing every trail and opening; most seemed to have been spun by the Golden Silk Orb-weaver (Trichonephila clavipes ). One of our largest spiders, it’s easily recognized by its size, the colorful patterns on its body, and the fuzzy ‘gaiters’ on its legs that remind me of the baggywrinkle used on sailing vessels.

A special treat was finding this very small example of a favorite spider: a Green Lynx (Peucetia viridans) less than an inch long.

Larger green lynx and crab spiders were lurking among some familiar flowers, although none was inclined toward a photography session. No matter. The flowers themselves provided attractive bits of color, and a foretaste of autumn’s typical golds and purples.

Spotflower ~ Acmella repens
Wild Petunia ~ Ruellia nudiflora
Arrowleaf Sida ~ Sida rhombifolia
Looseflower Water Willow ~ Justicia lanceolata

It took some time to identify the Water Willow — at least provisionally. As so often happens, location helped. Justicia ovata, which has similar leaves and flowers and carries the same common name, isn’t found in Texas, and J. americana isn’t found along the coast. When I return to Walden West, I’m hoping to find more easily photographed flowers in order to confirm their identity.

A last mid-summer mystery was this plant, which at first glance I took to be alligator weed: a common invasive introduced into this country in 1894. In fact, I had found a different non-native: Indian Heliotrope (Heliotropium indicum). Several other Heliotropium species are native to Texas, including Salt Heliotrope (H. curassavicum), but obvious differences in the leaves made clear which I had found.

Like the sunflower genus Helianthus, heliotropes were named for the belief that the plants turned their rows of flowers to the sun as the day progressed: in Greek, helios means ‘sun’ and tropein, the source of ‘tropium,’ means ‘to turn.’ This heliotrope certainly turned my head; perhaps I’ll find a native version when I return to Walden West.

 

And so the seasons went rolling on into summer,
as one rambles into higher and higher grass.
Walden ~ Henry David Thoreau

Comments always are welcome.

Walden West ~ May 2

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The first Turk’s Cap bloom of the season

When I visited Walden West on February 1, only a few Turk’s Cap leaves had managed to sprout. At the time, I predicted their vibrant flowers would begin appearing at the pond edges in a few weeks, and it seems my prediction was right.

On May 2, although only the single flower shown above had emerged, buds were forming everywhere. When I make my June visit, I suspect many more Turks’ Caps (Malvaviscus arboreus var. drummondii) will be shining in the woods.

American Germander

By early May, as fields of Bluebonnets and Indian Paintbrush began to fill the roadsides and fields, less noticeable but equally attractive flowers were emerging at Walden West.

American Germander (Teucrium canadense), a member of the mint family often found at the edges of ponds and marshes, clearly had been blooming for some time. Like Coastal Germander (T. cubense), a smaller plant with pure white flowers, American Germander flowers have a greatly reduced upper lip and a long lower lip. That long lip doesn’t mean the flower is pouting; it’s simply providing a landing pad for insect visitors.

Water Hyssop, or Herb-of-Grace

The solitary, bell-shaped flowers of Water Hyssop (Bacopa monnieri)  were new to me. According to Shinners & Mahler’s Flora of North Central Texas, the genus may carry a South American aboriginal name; the specific epithet honors Louis-Guillaume Le Monnier (1717–1799), a French natural scientist.

A mat-forming aquatic or semi-aquatic perennial, its small, white flowers sometimes are tinged with pink or blue. Also known as Herb-of-grace, the plant is a larval host for the White Peacock butterfly.

Now considered a member of the Plantain family, Water Hyssop formerly was included in the Figwort Family, and still is listed there in many sources. At Walden West, I found only a few plants, but it may be that as the summer progresses they will multiply.

Small Venus’s Looking Glass ~ Triodanis perfoliata

I’ve never found more than three or four stems of Venus’s Looking Glass in one location, but they do appear in every refuge I visit and at several locations on Galveston Island. Two were blooming at Walden West in early May; this one, and a second, shabby example that had been nearly nibbled to extinction by some insect.

Two other bits of lavender — Texas Vervain and Slender (or Rigid) Vervain also put in an appearance. Neither was abundant, but it may be that these were among the first to bloom.

Texas Vervain ~ Verbena halei
Slender vervain  ~ Verbena rigida (an introduced species)

As I looked past the vervains, a flash of white led me to a small stand of Whitetop Sedge.Their brilliant white bracts sometimes are confused with petals; they certainly are as attractive as any white flower. A somewhat showier species, Rhynchospora latifolia, is taller, with wider bracts; in Texas, it appears in the far eastern portions of the state.

Whitetop sedge ~ Rhynchospora colorata

Sedges tolerate shade, grow in a wide variety of soils, and occasionally can be found submerged in shallow waters. When they fill roadside ditches, the effect is remarkable.

Despite a relative absence of birds, increasing insect activity was obvious. This web, constructed only inches from the ground, indicated the presence of a very busy, if invisible, spider.

Say hello to the WWW ~ a Walden West Web

High above the ground, a Spiny-backed Orb Weaver (Gasteracantha cancriformis) went about her work. The six abdominal projections resembling spines give the spider its common name. It’s colors can be quite variable; I’ve seen orange spiders with black spines, white ones with red spines, and now this lovely yellow creature with black spines.

Spiny-backed orb weaver 

Conspicuous tufts of silk scattered about on this orb-weaver’s web are especially interesting.  They appear primarily on the foundation lines; it’s been suggested that the tufts make their webs more visible to birds that might otherwise destroy them.

Perhaps this bee didn’t notice those tufts of silk; he certainly didn’t notice them in time to avoid becoming entangled. While I couldn’t find the spider responsible for the web-work, the tufts do suggest a spiny-backed orb weaver had caught iself a meal.

Even dragonflies aren’t immune to capture. This one may have surprised the spider lurking below one of its wings at the bottom of the frame. If that tiny spider set out the web, it may have gotten more than it bargained for.

Come into my parlor, said the spider to the dragonfly

Other, luckier dragonflies flitted over and around the water,  including a female four-spotted pennant and the easily recognizable Halloween Pennant.

Four-spotted Pennant ~ Brachymesia gravida
Halloween Pennant ~ Celithemis eponina

While the dragonflies flitted and perched, a pretty snail paused on a convenient branch. Whatever its identity, it provides a fine model for moving through nature: slow and steady is the way to go.

 

And so the seasons went rolling on into summer, as one rambles into higher and higher grass.
Henry David Thoreau ~ Walden

 

Comments always are welcome.

A Ninety-Degree Difference

~ shoreacres ~ 73 Comments

A young friend once described dragonflies as being “all buzz and all wings.” It’s an apt description, although “jewel of the skies” seems equally appropriate.

It’s always a treat to find one at rest, showing off those jewel-like qualities. This one, which I take to be a pennant of some kind — perhaps a Halloween Pennant (Celithemis eponina) — was kind enough to remain at rest for several minutes. From my vantage point at the side of a county road, I was able to photograph it with a background of grasses on the other side of the ditch that was attracting so many of its kind.

Then, I decided to change position. Turning ninety degrees to my right, I posed the dragonfly against the gray and not necessarily appealing ditch water; the striations in the background are reflections of the reeds on the other side of the ditch.

It’s the same dragonfly and the same perch, shown only minutes apart, but the feel of the photo has changed. As in photography, so in life: what’s offered as ‘background’ — of a person or of an issue — can make quite a difference in our perception.

Comments always are welcome.

Feeling Crabby?

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A broken pincer could make for a crabby crab
I suspect we’ve all experienced periods of Lucy Van Pelt style crabbiness over the past months, but this creature is ‘crabby’ all the time. It is, after all, a crab: a familiar sight in my part of the world.

 

Since I usually encounter crabs in the water, finding this one scuttling along atop a grassy levee intrigued me.  After cutting an erratic path through the grasses, it made a sudden turn, scooted down the levee’s side, and disappeared into a hole several feet above the water. Minutes passed, but the crab didn’t reappear, so I decided it had reached its destination, and went on my way.

 

 

If the crab had been our tasty blue swimming crab (Callinectes sapidus), I might have looked for its friends and turned them into supper. But the crabs I’ve known tend to stay in or very near the water, and a little research led me to suspect I’d met my first blue land crab (Cardisoma guanhumi) in that grass.

 

Usually found farther south in Texas, the blue land crab does range all along the Gulf coast into Florida, and this one had all the marks of C. guanhumi: a blue-green carapace and orange-to-brown legs, a single over-sized claw, its relatively large size and, of course, the fact that it was cruising around on land before it retreated into that hole.

 

A terrestrial species, the crab’s generally found near the shores of estuaries, creeks, and river banks. Burrowing into dense shrubbery, mud, or coastal sand hills, the crab prefers a burrow above the tide line and as much as six feet beneath the ground’s surface. Even when foraging, it doesn’t stray far from home, but uses light and sound to find the leaves, grasses, insects, and carrion it prefers. After foraging, it carries its food in its claws back to its burrow, eats until satisfied, and saves the leftovers for later.

 

The crab leads a relatively hidden and solitary life, but despite its solitary nature, on this day it seemed to welcome — or at least tolerate — an unexpected visitor. When a Blue Corporal dragonfly (Ladona deplanta) stopped by for an extended visit, they seemed perfectly at ease with one another, and not at all crabby or blue.

 

Comments always are welcome.

A Salty Old Girl

~ shoreacres ~ 71 Comments
  Female Seaside Dragonlet on  Marsh Bristlegrass ~ Brazoria Wildlife Refuge

The Seaside Dragonlet (Erythrodiplax berenice) spends most of its time perched atop salt marsh plants; here, one rests on a stem of marsh bristlegrass (Setaria parviflora).

Perhaps ‘saltmarsh dragonlet’ would be a better name, since they’re often the only dragonfly in the marshes. Other dragonflies appear in coastal habitats, hunting insects over dunes and wetlands, but no other species is as tied to the coast as the dragonlet; they rarely appear inland, and are considered to be our only marine dragonfly.

The primary reason is their adaptation to salt. Like all dragonfly larvae, seaside dragonlet nymphs are aquatic, but their ability to regulate the concentration of salt within their bodies allows them to thrive in saltwater; researchers have found them tolerating water as much as three times the salinity of the ocean. In salt marshes, the seaside dragonlet often is the only medium-sized dragonfly — about an inch and a half long — that’s encountered.

Salt marshes are insect-rich, so dragonlets can afford to be a little lazy. They do less flying and more waiting than many species: launching themselves out to capture passing prey before returning to their perch.

Adult males are deep blue or black, with clear or nearly-clear wings; females show varying amounts of yellow atop the abdomen, and elaborate patterns of black-and-yellow striping on the sides of the thorax. As accomodating as they are attractive, they make fine subjects for a photographer.

 

Comments always are welcome.