Posts Tagged ‘male’

Male Blue-faced Meadowhawk dragonflies

February 4, 2018

On the same day that I saw a male Blue-faced Meadowhawk dragonfly (Sympetrum ambiguum) with an eye injury, one or more other males were photographed at the same location in Huntley Meadows Park, Fairfax County, Virginia USA.

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male)

Please look at the full-size version of each photo in order to fully appreciate these handsome little devils!

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male)

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male)

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male)

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male)

Copyright © 2018 Walter Sanford. All rights reserved.

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Eye injury

January 31, 2018

A Blue-faced Meadowhawk dragonfly (Sympetrum ambiguum) was spotted near a vernal pool at remote location in Huntley Meadows Park, Fairfax County, Virginia USA. This individual is a male, as indicated by his terminal appendages.

When I post-processed the RAW images of the male dragonfly I noticed he has an eye injury, highlighted in the following annotated image.

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male, with eye injury)

(See a full-size version of the original photo, without annotation.)

The eye injury can be seen in two more photos of the same male.

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male, with eye injury)

22 OCT 2017 | HMP | Blue-faced Meadowhawk (male, with eye injury)

Related Resource: Eye injury, a blog post by Walter Sanford, featuring photos of a female andromorph Blue-faced Meadowhawk dragonfly spotted on 18 September 2013 along the boardwalk of the central wetland area at Huntley Meadows Park.

Copyright © 2018 Walter Sanford. All rights reserved.

Lunch time

January 21, 2018

A Blue-faced Meadowhawk dragonfly (Sympetrum ambiguum) was spotted at ~12:13 p.m. near a vernal pool at a remote location in Huntley Meadows Park, Fairfax County, Virginia USA. This individual is a male, eating an unknown species of winged insect.

25 OCT 2017 | HMP | Blue-faced Meadowhawk (male, eating)

The first photo is the scene-setter.

25 OCT 2017 | HMP | Blue-faced Meadowhawk (male, eating)

The last two photos are cropped so that the predator and prey are more prominent. The dragonfly barely moved from the first-to-last photos; the position of the butterfly/moth moved slightly as it was eaten.

25 OCT 2017 | HMP | Blue-faced Meadowhawk (male, eating)

Did you notice there are three insects shown in each photo? Perhaps the fly is an opportunist, waiting to clean-up the leftovers from the dragonfly’s lunch.

Copyright © 2018 Walter Sanford. All rights reserved.

Resting on a Coleman camp stool

January 13, 2018

In addition to my photography gear, I usually carry a Coleman camp stool when I go photowalking. The small, lightweight folding chair is good for resting while waiting for “the game to come to me.” The camp stool also enables me to get closer to subjects either on- or near the ground. And I think it’s easier to hold my camera rock-steady when I’m sitting on the chair with my elbows resting on my knees.

I like my Coleman camp stool. Some of my favorite insects like to rest on the camp stool too!

22 OCT 2017 | HMP | Autumn Meadowhawk (male, perching on a stool)

An Autumn Meadowhawk dragonfly (Sympetrum vicinum) was spotted near a vernal pool at Huntley Meadows Park, Fairfax County, Virginia USA. This individual is a male, perching on a Coleman camp stool.

22 OCT 2017 | HMP | Autumn Meadowhawk (male, perching on a stool)

22 OCT 2017 | HMP | Autumn Meadowhawk (male, perching on a stool)

Copyright © 2018 Walter Sanford. All rights reserved.

New discoveries in 2017 (odonates)

December 28, 2017

There’s always more to discover/learn! My odonate-related new discoveries in 2017 are presented in reverse-chronological order.

Fine-lined Emerald dragonfly

A Fine-lined Emerald dragonfly (Somatochlora filosa) was spotted at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. This individual is one of several males spotted during a period of a week-or-so in mid-September 2017.

Immature male Calico Pennant

20 JUN 2017 | OBNWR | Calico Pennant (immature male)

A Calico Pennant dragonfly (Celithemis elisa) was spotted at Painted Turtle Pond, Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. This individual is an immature male. Notice its coloration is similar to female Calico Pennants.

Allegheny River Cruiser dragonfly

An Allegheny River Cruiser (Macromia alleghaniensis) was netted by Mike Blust at Hardware River Wildlife Management Area, Fluvanna County, Virginia USA. This individual is a male.

Harpoon Clubtail dragonfly

09 JUN 2017 | Highland County, VA | Harpoon Clubtail (male)

A Harpoon Clubtail dragonfly (Phanogomphus descriptus) was spotted at “Straight Fork,” Highland County, Virginia USA. This individual is a male. Sincere thanks to fellow Virginians Karen Kearney and Mike Boatwright for guiding me to this unique high-elevation habitat.

It’s worth noting that I saw two more new species during the same trip: Riffle Snaketail (Ophiogomphus carolus); and Dot-tailed Whiteface (Leucorrhinia intacta).

Those who know me well are familiar with one of many “Walterisms”: “I haven’t ‘seen’ something until I have photographed it.” My rationale is two-fold: 1) A photograph verifies a sighting. 2) The detail visible in a good photograph exceeds the acuity of the human eye. Suffice it to say I saw two other species but haven’t seen them. Makes sense to me!

Swift River Cruiser dragonfly

A Swift River Cruiser dragonfly (Macromia illinoiensis) was spotted at Riverbend Park, Fairfax County, Virginia USA. This individual is an emergent/teneral female.

Spine-crowned Clubtail dragonfly

A Spine-crowned Clubtail dragonfly (Hylogomphus abbreviatus) spotted along Bull Run at Hemlock Overlook Regional Park, Fairfax County, Virginia USA. This individual is a male. A female was spotted on the same day at a nearby location.

Epitheca cynosura exuvia

A Common Baskettail dragonfly (Epitheca cynosura) exuvia was collected at Painted Turtle Pond, Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

Epitheca princeps exuvia

05 MAR 2017 | Prince Baskettail (Epitheca princeps) | exuvia (face-head)

A Prince Baskettail dragonfly (Epitheca princeps) exuvia was collected from an unknown location. This specimen was on temporary loan from Huntley Meadows Park, Fairfax County, Virginia USA.

Copyright © 2017 Walter Sanford. All rights reserved.

Urban Heat Island

December 10, 2017

On 01 December 2017 I didn’t see any Autumn Meadowhawk dragonflies (Sympetrum vicinum) during a photowalk along Easy Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

In contrast, I saw several Autumn Meadowhawks perched on man-made structures such as a concrete curb in the blacktop parking lot at the refuge. All of the dragonflies were perched on vertical surfaces that received more direct insolation than horizontal surfaces. The parking area seems to be an urban heat island microclimate that exists within a larger natural area.

Male 1

The first individual is a male, as indicated by his terminal appendages. Although the male is missing one of four wings, he was able to fly well enough to move to three different perches along the curb.

01 DEC 2017 | Occoquan Bay NWR | Autumn Meadowhawk (male, injured)

01 DEC 2017 | Occoquan Bay NWR | Autumn Meadowhawk (male, injured)

01 DEC 2017 | Occoquan Bay NWR | Autumn Meadowhawk (male, injured)

Male 2

The next male has a full set of four wings; his wings are tattered slightly, as expected toward the end of dragonfly season.

The last photo shows the male grooming and excreting at the same time.

Related Resources

Copyright © 2017 Walter Sanford. All rights reserved.

“Winter Meadowhawk” dragonflies

December 8, 2017

The season called “winter” is defined two ways: atmospheric scientists, including meteorologists and climatologists, define winter as the three-month period from December to February; astronomers define winter as the time period that begins on the December Solstice (12/21) and ends on the March Equinox (03/21), although the actual dates for these events may vary slightly.

Several Autumn Meadowhawk dragonflies (Sympetrum vicinum) were spotted on the first day of climatological winter at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. Therefore I think it is appropriate to call them “Winter Meadowhawks.”

The last two photos show the same male, perching on different surfaces. My guess is he was looking for a good source of thermal energy on a cool, windy day.

The Sun is always low in the sky during winter, even at its maximum altitude. Indirect incoming solar radiation (insolation) is less intense than direct insolation. The last photo shows the male dragonfly perched on a south-facing wooden board that is perpendicular to the surface of the Earth, therefore the solar energy received by the board is more intense than the energy received by the ground. This probably explains why the male moved from the ground to the board.

Enrichment

The last photo was taken on 01 December 2017 at 11:33:50 a.m. EST, as shown by the EXIF information for the image. The altitude of the Sun was 28.9° at 11:30 a.m., meaning a ray of sunlight formed an angle of 28.9° with horizontal surfaces such as the ground. At the same time, a ray of sunlight formed an angle of 61.1° with vertical surfaces such as the wooden board shown in the first and last photos. That’s the beauty of mathematics — some simple geometry shows clearly which surface received more intense insolation. Smart dragonflies!

Related Resource: Sun or Moon Altitude/Azimuth Table, U.S. Naval Observatory.

Copyright © 2017 Walter Sanford. All rights reserved.

Incredible!

December 4, 2017

Odonates are aquatic insects. They spend most of their life as larvae that live in water; this stage of their life cycle can last from a few months to a few years. Finally, they emerge from the water and metamorphose into adults in order to reproduce; their offspring return to the water and the cycle begins again.

Careful and/or lucky observers will notice exuviae (sing. exuvia), also known as either “cast skins” or “shed skins,” left behind when odonate larvae emerge. Would you believe this…

metamorphosed into that? (See below.) It’s a miraculous transformation! The adult stage of the odonate life cycle can last from a week-or-so to a month-or-so, depending upon the species.

The first photo shows an exuvia from a Cobra Clubtail dragonfly (Gomphurus vastus), photographed in situ at Riverbend Park, Fairfax County, Virginia USA. All other photos in this gallery show adult male Cobra Clubtails, as indicated by their terminal appendages and “indented” hind wings.

Copyright © 2017 Walter Sanford. All rights reserved.

A week later…

November 26, 2017

On 09 November 2017 I visited Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA, looking for late-season odonates before the first hard freeze. Several Autumn Meadowhawk dragonflies (Sympetrum vicinum) were spotted during a photowalk along Easy Road.

I revisited the same place one week later. I saw slightly fewer Autumn Meadowhawks than the week before. Although some dragonflies survived the freezing temperatures, their numbers seemed to be diminished according to my non-scientific survey.

Both individuals featured in this photo set are male, as indicated by their terminal appendages.

I love the palette of fall colors in the first two photos! The two-photo sequence shows how I typically “work a shot.” I start by “getting a shot, any shot” (above) and slowly refine the shot until I am able to get as close as the subject will allow, while looking at the overall composition (below). Remember to check the edges of the photo for leading lines and distracting elements.

The last dragonfly I photographed was perched on the wooden border of a flower bed located near the parking lot.

Related Resources: Five Guys; Thermal energy vampire!

Copyright © 2017 Walter Sanford. All rights reserved.

Thermal energy vampire!

November 24, 2017

The following photographs show an Autumn Meadowhawk dragonfly (Sympetrum vicinum) perching on Walter Sanford (hey, that’s me!) at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. This individual is a male, as indicated by his terminal appendages.

All three photos were taken by Lisa Young during a photowalk with me along Easy Road.

Most dragonflies are skittish. Some species of dragonflies are “friendly,” such as Blue Corporal dragonflies (Ladona deplanata) and Autumn Meadowhawk dragonflies (Sympetrum vicinum). It’s probably not a coincidence that both types of dragonflies are early- and late-season species, when the ambient air temperature is cooler.

Some odonate experts speculate dragonflies perch on people in order to absorb thermal energy radiated by the relatively warm human body. Or in this case, a black backpack — a good spot since darker-colored objects absorb and re-radiate thermal energy more quickly than lighter-colored objects.

Related Resource: Five Guys, a blog post by Walter Sanford featuring photos of male Autumn Meadowhawk dragonflies taken before the meet-up with Liza Young.

Copyright © 2017 Walter Sanford. All rights reserved.


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