Sometimes, looking for plants and flowers in winter can be interesting, particularly near a source of fresh water in the desert. In November, I visited Rogers and Blue Point Springs on the north shore of Lake Mead in the Lake Mead National Recreation Area. Rogers Spring and other springs in the “North Shore Complex” comprise one of the terminal discharge areas for the regional carbonate-rock aquifer system of eastern Nevada and western Utah. The source of the water to this spring and other regional carbonate-rock aquifer springs is uncertain. The prevailing theory suggests that much of the recharge water that enters the carbonate-rock aquifer occurs in the high mountain ranges around Ely, Nevada, located 250 miles north of Lake Mead. As this ground water flows south through the carbonate rocks, it encounters several faults along the way, including the Rogers Spring Fault, which has caused the older carbonate rocks (primarily limestone and dolomite) to be displaced against younger evaporite deposits of the Muddy Creek and Horse Spring formations. Here, the lower permeability of these evaporite deposits, along with high subsurface water pressure, forces the ground water in the carbonate rocks to flow upward along the fault and emerge at the surface as Rogers Spring.
When I first moved to Las Vegas there were virtually no mosquitoes and no flies. However as the population has increased and the local climate has changed with more landscaping and water we have seen a corresponding increase in bugs. That is not to say that there were no insects in the desert, as with flowers and plants you just have to look more carefully. There are an amazing variety of specialized insects living in the desert surrounding Las Vegas under conditions that would be considered hostile for any other insects. Again just like flowers and plants, the insects can come and go quickly over specific times like spring or after precipitation and are often found in specific areas suited to their needs. The Henderson Bird Viewing Preserve is a great place to see lots of unusual insects due to the presence of water and hospitable plants. Bees, wasps, dragonflies and butterflies are diverse and are part of the special ecology of the preserve, both prey and predator for birds and other inhabitants. Fortunately, there are very few mosquitoes, probably due to the dragonflies and the dry heat. Due to carefully selected and strategic native plants, there are a variety of native flowers all summer long which support a diverse and vibrant ecosystem. In this post I thought I would focus on some really interesting bees and wasps which I saw at the preserve.
Spring comes early in Las Vegas and it comes suddenly, usually with bursts of wind. We had a few days of warm weather and everything started blooming. These are ornamental plum trees which lose their purple leaves in the winter and bloom in the spring. Because of its dark foliage and contrasting colorful flowers, the ornamental plum (Prunus cerisifera) is one of the most popular trees used in landscaping in Las Vegas. The deep purple leaves add an accent to predominantly green landscapes and catch the eye all over town.