Archive for the ‘photowalking’ Category

American Lady butterfly

February 20, 2018

An American Lady butterfly (Vanessa virginiensis) was spotted during a photowalk at Meadowood Recreation Area, Fairfax County, Virginia USA.

This butterfly looks similar to several species with which I’m familiar but isn’t a perfect match, so I consulted the experts on the BugGuide Facebook group. Sincere thanks to Matt Pelikan, Jack Blackford, and Ken Childs for help in identifying the butterfly.

Copyright © 2018 Walter Sanford. All rights reserved.

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Predator and prey

February 8, 2018

A Black and Yellow Argiope (Argiope aurantia) was spotted during a photowalk along Deephole Point Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. A female Common Whitetail dragonfly (Plathemis lydia) is trapped in the spider web.

“Eat or be eaten” is perhaps the most fundamental law of nature. Predator-prey relationships can change suddenly: one minute a predator, such as a dragonfly, is hunting for its next meal; next minute the dragonfly becomes the prey and is a meal for another predator, such as a spider, elsewhere in the food web.

Copyright © 2018 Walter Sanford. All rights reserved.

Legend of the Woolly Bear caterpillar

January 29, 2018

A “Woolly Bear caterpillar” was spotted during a photowalk at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

Wooly Bear caterpillar is the larval form of the Isabella Tiger Moth (Pyrrharctia isabella).

According to legend, …

The Woolly Bear caterpillar has 13 distinct segments of either rusty brown or black. The wider the rusty brown sections (or the more brown segments there are), the milder the coming winter will be. The more black there is, the more severe the winter. Source Credit: WOOLLY BEAR CATERPILLARS AND WEATHER PREDICTION – USING WOOLLY WORMS FOR A WINTER FORECAST, The Old Farmer’s Almanac.

Is the legend scientifically valid?

…this myth has been around since, you know, the colonial times. But in 1948, this curator of entomology from the American Museum of Natural History, Dr. Howard Curran, he did a little study. He went out to Bear Mountain, New York, and he counted the woolly bears, the bands – the brown bands of the woolly bear there. And he counted about 15 different specimens, and he made a prediction. Source Credit: The Myth of the Woolly Bear, National Public Radio.

Problem is, a sample size of 15 is insufficient for making meaningful conclusions. So looking at one caterpillar, as I did, is completely meaningless. Nonetheless, I always think of the legend whenever I see a Woolly Bear and wonder what it tells me about the upcoming winter.

Related Rescources

Copyright © 2018 Walter Sanford. All rights reserved.

Red-spotted Purple butterflies

January 25, 2018

A Red-spotted Purple butterfly (Limenitis arthemis astyanax) was spotted during a photowalk along Deephole Point Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

About a week later, another Red-spotted Purple was spotted during a walk around Mulligan Pond at Jackson Miles Abbott Wetland Refuge, Fairfax County, Virginia USA.

The appearance of Red-spotted Purple seems to be somewhat variable.

Copyright © 2018 Walter Sanford. All rights reserved.

Question Mark

January 23, 2018

A Question Mark butterfly (Polygonia interrogationis) was spotted during a photowalk at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

Two field marks can be used to identify this butterfly. First, notice the row of four dark spots on the dorsal side of its forewings (highlighted in an animated GIF by Deb Platt).

Second, notice the silver-white question mark shape on the ventral side of its hind wings (highlighted in an animated GIF by Deb Platt).

Related Resources

Copyright © 2018 Walter Sanford. All rights reserved.

Different point of view

January 15, 2018

The first photo shows “The Osprey’s at Belmont Bay,” as seen from the opposite side of Belmont Bay. “The Osprey’s” community shares a common boundary with Occoquan Bay National Wildlife Refuge, located to the left of this photo.

11 JAN 2018 | Prince William County, VA | The Osprey’s at Belmont Bay

The next photo shows the near shoreline of Belmont Bay. The bay is almost completely covered by ice after two weeks of below-freezing temperatures.

11 JAN 2018 | Fairfax County, VA | Belmont Bay

Notice the duck blind located in the water.

11 JAN 2018 | Fairfax County, VA | Belmont Bay

The following photo shows a dock and boat ramp located at the mouth of a small stream that is a tributary of Belmont Bay.

11 JAN 2018 | Fairfax County, VA | dock and boat ramp

The next photo is located upstream from the dock and boat ramp.

11 JAN 2018 | Fairfax County, VA | small tributary of Belmont Bay

The last photo shows a location far upstream from Belmont Bay. The stream is located at the bottom of a steep-sided valley.

11 JAN 2018 | Fairfax County, VA | small tributary of Belmont Bay

Tech Tip: I used my Panasonic Lumix DMC-FZ150 superzoom camera to shoot the landscape photos featured in this blog post. The camera was set for manual focus at the hyperfocal distance for an aperture of f/4, based upon the instructions provided in the excellent video tutorial by Graham Houghton, “Panasonic Lumix FZ camera easier manual focus method — super point-and-shoot tip.”

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.

Autumn Meadowhawk dragonflies (mating pairs, in wheel)

January 11, 2018

Several mating pairs of Autumn Meadowhawk dragonflies (Sympetrum vicinum) were spotted during a photowalk around a vernal pool at a remote location in Huntley Meadows Park, Fairfax County, Virginia USA.

22 OCT 2017 | HMP | Autumn Meadowhawk (mating pair, “in wheel“)

Both pairs are “in wheel“: the male is on top; the female is on the bottom.

All odonates (dragonflies and damselflies) have a 10-segmented abdomen, numbered from front to back. Male dragonfly secondary genitalia, called hamules, are located in segments two and three (S2 and S3); female genitalia in segment eight (S8). Dragonflies form the mating wheel in order for their genitalia to connect during copulation.

22 OCT 2017 | HMP | Autumn Meadowhawk (mating pair, “in wheel“)

Editor’s Note: Careful readers may be thinking “Hey, wait a minute — you said you spotted several mating pairs, but the post features photos of just two pairs.” Good catch! The photos of two more mating pairs didn’t make the final cut because the focus was slightly soft in all of those photos.

Copyright © 2018 Walter Sanford. All rights reserved.

Dragonflies and Damselflies (poster, slideshow)

January 3, 2018

 

D R A G O N F L I E S  A N D  D A M S E L F L I E S
HUNTLEY MEADOWS PARK

W A L T E R  S A N F O R D
Educator | Naturalist | Photographer

 

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.


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