Our August Trip to the Algodones Dunes

It's been a little over a month since our trip to the Algodones Dunes, about 7.5 miles south of Glamis. I finally have a chance to report some of the things seen on that trip.

There had been moderately heavy rain prior to our arrival, and mud was extensive still. The areas about 8 miles south were off limits to camping as of this year, so we camped just north of that area, in a small Palo Verde pocket on the east side of the main dune system.

Similar fauna to what we observed in 2013 were seen, with some new invertebrates.

Hydrophilus triangularis, a first for me at the dunes. This is a large beetle - over an inch long.

Weevil, still wearing an outfit of dried mud from the rains.

Eburia falli, a nice cerambycid of the dunes. I have seen this species on several occasions there in the past, as well.

Initially I thought that this was Oxygrylius ruginosus, as opposed to Tomarus gibbosus, which is so common west of the deserts. But the apex of the clypeus seems to have two small points, instead of one, so it may be Tomarus. Thanks to Art Evans for pointing out the difference. These beetles were extremely numerous here in the dunes this year in this location.

These beetles liked burrowing. Here's one, taking advantage of the soft sand.

MANY showed up at the black light sheets.

These field crickets were also present in very high numbers.

These little rove beetles were also EXTREMELY abundant.

A sand roach, probably Arenivaga sp.

Scorpions were out in numbers after dark. This one nabbed one of the small dynastines...

...then it snagged one of the ubiquitous crickets! If it had a larder somewhere, it must have been full at the end of this night!

A BIG velvet mite - Dinothrombium sp. A couple were seen near one light, ambling along like fuzzy teddy bears.

I have seen these very pale asilids at the dunes before. This one was determined by Eric Fisher from this photo as Efferia candida, a common species of the Colorado Desert in early summer.

We found a Sidewinder half buried in the sand. They will bury themselves completely with only the eyes protruding. This behavior may explain the sudden appearance of the sidewinder by my leg last year. I probably knelt by a buried one (as Gary suggested).

This is what the Sidewinder's spot looked like in the morning (it never moved over the several hours of early evening while we were active).

A Diversion to the Algodones Dunes, Imperial County, California

About a week ago, some energetic thunderstorm cells dropped rain on the Algodones Dune system in Imperial County. We thought we would explore them to see what life might have been triggered into activity by the rain.

We chose to spend one night about eight miles south of Glamis, in a Palo Verde grove nestled up against the eastern edge of the dunes.

The vegetation was much less than what we observed last year in about the third week in September. There had been massive rainfall weeks before last summer, and the dune region was full of green growth, and insect and spider activity.

This year was still very rich, though, in arthropods, and vertebrates, as well.

Around dusk, a sandstorm was visible to the west. A warning went out for the Glamis area. Several thunderstorms were visible, here and there close by, but not overhead! The wind picked up and the sand started whipping, but in about an hour, everything calmed and the rest of the night was hot, calm and dark - perfect for observing insects and other creatures!

Sunset from the dunes. Eight miles S. of Glamis, August 31, 2013.

The habitat. This photo was taken in September of 2011, a dry year.

Bolbocerastes imperialis, male. Eight miles S. of Glamis, August 31, 2013.

Edrotes arens, a small tenebrionid species that I have searched for without success in the past. They were pretty abundant on the sand of the dunes after dark. Apparently, they mimic rabbit droppings, a nice adaptation in a food-poor environment! Eight miles S. of Glamis, August 31, 2013.

Temnoscheila sp. These beetles are real biters when picked up! Quite a few came to our lights throughout the night. Eight miles S. of Glamis, August 31, 2013.

Osmidus guttatus. Eight miles S. of Glamis, August 31, 2013.

A very small tenebrionid. Probably Triorophus sp. Eight miles S. of Glamis, August 31, 2013.

Cerenopus concolor. I've seen them regularly in the local deserts over the years. Eight miles S. of Glamis, August 31, 2013.

A very large solifuge. Its body length is about 30 mm. 

These scorpions were VERY abundant on the sand of the dunes after dark. They seemed to be scattered about 3 feet apart...everywhere. 

A Sidewinder. I found this snake by almost stepping on it as I started to stand up from kneeling in the sand. Looking down, I saw the snake only a couple inches from my leg. I staggered left and it moved to the right, and all was well! Then a photo session ensued, of course. Eight miles S. of Glamis, August 31, 2013.

Sidewinder, on the move. Eight miles S. of Glamis, August 31, 2013.

Close-up of the Sidewinder. Eight miles S. of Glamis, August 31, 2013.

Western Banded Gecko. This little lizard was oozing with personality. It would take a couple steps in the sand, lash its tail like a tiny cat, and stare intelligently ahead, in search of gecko-prey. Then it would stalk an inch or two forward and repeat the process. Eight miles S. of Glamis, August 31, 2013. 

Western Banded Gecko, portrait. Eight miles S. of Glamis, August 31, 2013.

Palo Verde seedlings. These were scattered widely, triggered by the rain.

Here are a couple photos from last September, showing the vegetative growth. The vines were still present this year, but were utterly dry and desiccated, although some showed new green growth from last week's rain. The yellow composites in the photo below were not out yet this year.

Vine growth, September 2012. Eight miles S. of Glamis.

Yellow composites, September 2012. About six miles S. of Glamis.