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Mojave National Preserve & U.S National Park Service Mojave National Preserve & U.S. Department of the Interior Sweeney Granite Mountains Desert Research Center Science Newsletter Special Edition Genetic Research Reveals Pleistocene Origin and Low Genetic Diversity of the Mojave Fringe- toed Lizard (Uma scoparia) Andrew Gottscho1,2 When I first visited the Mojave National Preserve (MNP) in May 2006 with my herpetology class to learn about the biology of desert reptiles, I was impressed by the population of Mojave Fringe-toed Lizards (Uma scoparia) that inhabit the Kelso Dunes. Unlike most reptiles in the Mojave Desert that occur in a variety of habitats, fringe-toed lizards are restricted entirely to windblown sand, including large dunes like those at Kelso, but also smaller hummocks and sandy In this Issue: Page 1. Genetic Research Reveals Pleistocene Origin and Low Genetic Diversity of the Mojave Fringe-toed Lizard (Uma scoparia) Page 5. Past and present highlights of nematode research in the Mojave Desert Page 7. Three Wasps, Three Plants, One Ant: Life History of Desert Orasema Page 13. Watching plants move: Tracking landscape effects on movement in the common desert shrub catclaw acacia [Acacia (Senegalia) greggii A Gray] Page 17. New Poppies from the Mojave 1 Department of Biology, San Diego State Figure 1. A) Fringe-toed lizard habitat at Kelso Dunes in the Mojave National Preserve. B) Toe University, San Diego, California. fringes increase surface area and traction in loose sand. C) Fringe-toed lizards often conceal 2 themselves below the sand, with only their eyes protruding above the surface. D) A Department of Biology, University of California, camouflaged pattern helps them escape predators while active above the sand. Photos: Riverside, California. Cameron Rognan. Mojave National Preserve Science Newsletter May 2014 flats (e.g., Devil’s Playground). They speciated – that is, when it diverged from Granite Mountains Desert Research have evolved a number of adaptations to its closest relatives, the U. notata species Center and Zzyzx Desert Studies Center, survive in this exposed habitat (Figure 1), complex in the Colorado Desert of we collected DNA samples from 93 U. including their namesake toe fringes – southernmost California, Arizona, and scoparia representing 20 localities elongated scales which increase the northwestern Mexico (3). We also wanted spanning the Mojave Desert, including foot’s surface area to facilitate efficient to test whether the various populations of Kelso Dunes in the MNP, Ibex Dunes in locomotion in loose sand (1). They also U. scoparia are genetically Death Valley National Park, and Pinto possess shovel-shaped snouts, distinguishable using nuclear DNA Basin in Joshua Tree National Park overlapping eyelids and earflaps, a (nDNA) sequences, which might be (Figure 2). In 2009, we obtained 16 counter-sunk lower jaw, and granular expected considering they are isolated samples of their closest relative, the U. scales to assist in rapid burial (2). Fringe- across the Mojave Desert with few notata species complex, in the Colorado toed lizards spend the night buried under apparent opportunities to migrate and Desert of southern California and the sand or in a burrow, emerging in the interbreed. The northernmost populations Arizona. Because U. scoparia and U. morning to bask, forage, and socialize. at Ibex Dunes, Dumont Dunes, and notata are protected in California as When confronted by predators, they Coyote Holes, located just to the north of Species of Special Concern (SSC), we either remain motionless, relying on their the MNP near the Amargosa River, were used minimally invasive methods to camouflaged pattern to avoid detection, previously found to have minor obtain DNA. Lizards were captured with a or rapidly run several meters to a shrub differences in mitochondrial DNA noose or by hand and a small portion (< 1 or dune where they disappear under the (mtDNA) compared to southern cm) of the tail tip was removed and sand, their concealed position given populations in the Mojave River and preserved in 95% ethanol. Date, time, away only by their tracks. Colorado River watersheds (4). We GPS coordinates, snout-vent length, sex, wanted to test whether the same pattern ventral surface temperature, and sand Uma scoparia, the northernmost of could be detected in the nDNA. surface temperature were recorded. The several fringe-toed lizard species, lizards were photographed and released currently ranges across much of the In spring 2008, based at the Sweeney within five minutes of capture. southwestern Mojave Desert, from southern Death Valley in the north, to Parker, Arizona, in the east, Joshua Tree National Park in the southwest, and the vicinity of Barstow in the west. Although U. scoparia are abundant in appropriate habitat, their geographic distribution is fragmented by rocky hills, dry playas, bajadas, and desert pavement. The distribution of U. scoparia is puzzling – if these lizards are never observed away from windblown sand, how did they cross the intervening barriers? Where did these lizards come from, and how long have they been here? These unsolved questions inspired me to study U. scoparia for my master’s degree in Biology at Humboldt State University in 2007. In 2008, with help from my advisors, Dr. Bryan Jennings and Dr. Sharyn Marks, I received grant funding and permits from several government agencies and non-profit organizations to pursue genetic research on U. scoparia (see Acknowledgements). Our primary goal was to estimate when U. scoparia Figure 2. Map of fringe-toed lizard DNA samples used in our study. 2 Mojave National Preserve Science Newsletter May 2014 Back in the laboratory, we extracted DNA from the tissues and sequenced 14 genes for a total of 7,046 base pairs, of which 157 (2.2%) were variable. We found that U. scoparia had quite low genetic diversity (Figure 3), comparable to the nuclear DNA of humans (5), chimpanzees (6), and elephant seals (7). Although genetic diversity was slightly higher in the southernmost populations, we were surprised that our data could not differentiate lizards in the Amargosa River watershed from those in the MNP and surrounding areas. However, we did detect 14 diagnostic single nucleotide Figure 3. Comparisons of mean nucleotide diversity (a measure of genetic diversity) among fringe-toed lizards and selected mammal species with low genetic diversity. All estimates are polymorphisms (SNPs) that differentiate based on nuclear DNA (nDNA). U. scoparia from the U. notata species complex. The low genetic diversity of U. commonly known as the “ice ages”, about Mojave Desert, including the Mojave and scoparia was especially striking 875,000 years ago (the 95% confidence Amargosa Rivers (12). Pollen extracted compared to the population of U. notata interval is 540,000 – 1.3 million years from fossilized packrat middens show at the Algodones Dunes in extreme ago). Although this seems like a long that during the LGM, the lowlands southeastern California. Our sample of time ago, it is very recent on a geological supported a semiarid pinyon/juniper only 13 lizards collected in a small area time scale – for comparison, humans and woodland that is currently confined to the (< 2 km2) of the Algodones Dunes chimpanzees share a common ancestor Great Basin Desert and the highest contained more than three times the about 6 million years ago, and some of elevations within the Mojave Desert (13). genetic diversity (Figure 3) than our the rock outcrops in the Mojave Desert During arid interglacial periods, including sample of 93 U. scoparia collected across are hundreds of millions of years old. the current Holocene epoch, most rivers the Mojave Desert, and this difference and lakes dried up, exposing sediments was statistically significant (2-tailed t-test, In summary, our genetic analyses to the wind and promoting a pulse of P = 0.006). suggested that U. scoparia is a relative dune accumulation (14). For example, at newcomer to the Mojave Desert, the end of the Pleistocene the Mojave We suspected that the low genetic descended from ancestors in the River terminated at Lake Manix east of diversity and lack of genetic Colorado Desert. Yet the mystery Barstow, until 13,000 years ago when the differentiation among the various remains: if these lizards are entirely natural dam containing the lake burst, populations of U. scoparia might reflect a restricted to sand dunes, but the dunes rapidly eroding Afton Canyon and recent origin of this species, so we used are spatially isolated from each other, allowing the Mojave River to spill into a “molecular clock” to estimate the age of how did the lizards reach their current Lake Mojave, now represented by Silver speciation of U. scoparia. DNA molecules distribution? and Soda Lakes at the northwest corner mutate at a slow but roughly constant of the MNP (15). When Lake Mojave rate, so the longer since two species To answer this question, I reviewed the evaporated, its exposed sand migrated diverged, the more differences they geological literature of sand dunes in the southeast with the prevailing winds accumulate in their DNA sequences (8). Mojave and Colorado Deserts during the through the Devil’s Playground until the We calibrated our molecular clock with Pleistocene, when U. scoparia evolved. Granite and Providence Mountains published mutation rates of other reptiles The climate during this epoch was blocked further movement, forming the (9, 10). We used a computer model to cyclical, characterized by a series of massive Kelso Dunes. Similar scenarios estimate the divergence time between U. cooler, wetter glacial maxima (the ice have played out across the Mojave and scoparia and the U. notata complex while ages), interrupted by warmer and drier Colorado Deserts (16). accounting for variation in individual gene interglacial periods. Although this region divergence times (11). escaped the direct impact of the northern Herein lies the answer to the apparent glacial sheets during the last glacial paradox: rather than fringe-toed lizards Our results indicate that U.
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