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Biotic and Abiotic Factors Influencing the Distribution of Coleogyne Communities in Southern Nevada

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Biotic and Abiotic Factors Influencing the Distribution of Coleogyne Communities in Southern Nevada Great Basin Naturalist Volume 57 Number 2 Article 9 5-7-1997 Biotic and abiotic factors influencing the distribution of Coleogyne communities in southern Nevada Simon A. Lei University of Nevada, Las Vegas Lawrence R. Walker University of Nevada, Las Vegas Follow this and additional works at: https://scholarsarchive.byu.edu/gbn Recommended Citation Lei, Simon A. and Walker, Lawrence R. (1997) "Biotic and abiotic factors influencing the distribution of Coleogyne communities in southern Nevada," Great Basin Naturalist: Vol. 57 : No. 2 , Article 9. Available at: https://scholarsarchive.byu.edu/gbn/vol57/iss2/9 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Creat Basin Naturalist 57(2), © 1997, pp. 163-171 BIOTIC AND ABIOTIC FACfORS INFLUENCING THE DISTRIBUTION OF COLEOGYNE COMMUNITIES IN SOUTHERN NEVADA Simon A. Lei1 and Lawrence R. Walkerl ABSTRACT.-Cnleogyne ramosissima is a desert shruh that forms a nearly monuspecific shrubland and occupies a well·defined e1cvational band between approximately 1050 and 2150 m on mountain muges in southern Nevada. The Coleogyne shrubland shares relatively broad upper and [ower ecotones with Pinw-]umpen18 and Larrea·AmbmsiLl plant communities, respectively. We characterized the extent that environmental factors correlate with C<Jleogyne density and examined variation in biotic and abiotic factors along the lower elevational boundary ofCOleogYUB in Lucky Stri'ke Canyon near Las Vegas, Nevada. Coleogyne density was positively correlated with gravimetric soil moisture, soil organic matter, C.oleogyne waler potential, Coleogyne stem and leaf phosphoms, and Coleogyne leaf biomass. However, Coleogyne density wa... negatively com~Lated with soil temperatures, soJ comp..'1ction, and Colecgyne stem <Iud leaf nitrogen. Coleogyne stem biomass and elongation were generally negatively correlated with Coleogyne density. Coleogyne density was weakly cor­ related with .~oil pH, soil depth, soil nitrogen. soil and leafphosphorus; these variables did not exhibit a consistent. pattern with increasing elevation. Edaphic factors, particularly soil moisture and soil organic mattel; appear to playa major role in determining the distribution ofQJleogyne shrublunds in southern Nevada. Key wor-ds: Coleogyne rnmosissima, soils, lower Coleogyne ecotone, LucJ.:y Strike Canyon, Mojave Desert. Coleogyne ramosi-ssima Torr. (blackbrush) is silt, and mineral nutrients are mare abundant a member of the Rosaceae family and is the (Callison and Brotherson 1985). Sbrubs, on the only species in the genus Coleogyne. Coleogyn£ other hand, are mOre common on shallow and primarily establishes along the upper and cen­ sandy soils. Bowns (1973) suggested that low tral portions of the Colorado River drainage soil moisture limits the lower elevational and is an endemic yet Widespread species in boundary of Coleogyne communities in Utah. the southwestern United States (Bowns 1973). Hunter and McAuliffe (1994) proposed that an Previous studies have shown that Larrea tri­ increase in precipitation is the paramount fac­ dentata-Ambrosia d,urwsa plaot communities tor permitting the downslope establishment of appear to dominate between 900 and 1200 m Coleogyne. In the vicinity of Searchlight in elevation and are replaced by Coleogyne com­ southern Nevada, Coleog[llle estahlishes as low munities from 1200 to 1500 m elevation in the as 1080 m, whereas around Death Valley of Mojave Desert (Beatley 1969, 1976). Coleogyne southern California, Coleogyne is absent be­ low elevations of1350 m (Hunter and McAuliffe corrununities are replaced by Pinw; mOTIIJphylla­ 1994). Current geographic variation in precip­ Juniperus osteospemw woodlands at elevations itation appears to control the Coleogyne distri­ of 1500-1800 m. Coleogyne forms nearly mono­ bution at its lower elevational boundary. We specific stands in much of its range with rela­ examined abiotic I'tetors that might limit Cole­ tively broad upper and lower ecotones that ogyne at its lower elevationallimit in southern overlap adjacent communities by as much as Nevada. > 100 m in elevation in southern Nevada (Lei and Walker 1995). Coleogyne generally grows HISTORICAL BIOGEOGRAPHY well on sand, sandy loam, and loam, less well on gravel and clay loam, and poorly on dense Packrat (Neowma spp.) midden records from clay (Korthuis 1988). A negative correlation the state of Nevada reveal that woodland vege­ exists between the abundance of grdsses and lalion persisted to tbe end of the early Holo­ shrubs within the Coleogyne shrublands. For in­ cene at elevations as low as 1250 m in the stance, grasses, forbs, and cryptogamic crusts Mojave Desert (Betancourt et aJ. 1990). As are more common on deeper soils where clay, annual temperatures rose, Pinus-Juniperus lDepartment or Biological Scie1tce>. Unilo"l::nit)' of Nevada-w ~~s, I...aJl Vegas. NV H91S.-4004. 163 164 GREAT BASIN NATURALIST [Volume 57 trees migrated to higher elevations on desert the last pluvial period (20,000-10,000 yr B.P; mountain slopes and were replaced by desert Bradley 1964). shrubs (Betancourt et aJ. 1990). Cowogyne first Coleogyne shrublands generally share rela­ appears in the fossil record in 3 late-Wisconsin tively broad lower ecotones with Larrea­ Neotoma deposits in the Frenchman Flat area Ambrosia in southern Nevada (Lei and Walker of southern Nevada (approximately 10,000 yr 1995). Lucky Strike Canyon represents the ago) and should have extended theu to about typical vegetation and landscape conditions 700 m (Wells and Berger 1967). The entire preVailing in the region. The aim of this study Cowogyne zone and at least the upper part of was to determine the elevational range and the Larrea-Ambrosia zone around Frenchman Coleogyne density at its lower ecotone. This Flat were occupied by evergreen ]unipertts study also involved an investigation of biotic woodlands during the late Pleistocene (Wells and abiotic factors along the lower Coleogyne and Jorgensen 1964). The arrival ofxerophytic elevational boundary in Lucky Strike Canyon. shrubs and the extinction of woodlands in low elevations in the Mojave Desert occurred about STUDY AREA 8000 yr ago, and vegetation zones migrated upslope significantly around 1000 yr ago and Lucky Strike Canyon is located approxi­ continue through the present time (Betancourt mately 65 km northwest ofLas Vegas (36° 10'N, et aJ. 1990). 115° lO'W) between Lee and Kyle canyons on Coleogyne can be regarded as a paleoen­ the east-facing slopes of the Spring Mountains in southern Nevada. The Cowogyne community demic species, exhibiting little variability and in Lucky Strike Canyon is characterized by perhaps on its way to extinction (Bowns 1973). hot summers above 40 °C and cold winters The shrubs are considered relict because they below _10°C. Temperature means and extremes were probably once more widespread than at are negatively correlated with elevation. Sum­ present, and their current distribution repre­ mer rainfall usually occurs during thunder­ sents a restriction in their range with time storms in July and August and comes from the (Bowns 1973). However, paleoecological evi­ Gulf of California, drawn into the desert by dence reveals the ecotone Larrea-Coleogyne strong convectional currents (Rowlands et a1. has undergone frequent elevational migrations 1977). Summer storms are often local aud in­ during the Quaternary period (Pendleton et al. tense. Winter rains, on the contrmy, are mild and 1995). Evidence from packrat middens also widespread and come from the Pacific Ocean. shows Cowogyne has repeatedly moved up They may last up to several days. Snow is fre­ and down elevational gradients in response to quent at high elevations in southern Nevada, climatic shifts (Phillips and Van Devender 1974, particularly at the upper Coleogyne ecotone Cole and Webb 1985, Pendleton et aJ. 1995). with Pinus-Juniperus woodlands. A relative Pendleton et aJ. (1995) hypothesize that Cow­ humidity of < 20% is common in summer sea­ ogyne is currently migrating into areas where sons. High evaporation and low precipitation it is adapted to edaphic and climatic conditions. create a typical arid environment with an Cowogyne shrublands appear to be migrating average annual rainfall of <200 mm. toward higher elevations on desert mountain slopes in southern Nevada and northward into METHODS southern parts of the Great Basin Desert (B. Pendleton personal communication 1994). The Measurements were made in 1993 and ecology of Cowogyne seedlings at higher ele­ 1994 across the lower ecotone of Coleogyne in vations of the Mojave Desert and in the Great Lucky Strike Canyon. We established six 100­ Basin Desert may have different dynamics than m2 circular plots (5.65-m radius) along a tran­ lower elevation populations in the Mojave sect in the center of Lucky Strike Canyon at Desert. A global climatic shift toward lowered each of 6 elevations (1160--1310 m; 2.9 km in annual precipitation and more extreme fluctua­ distance) at 30-m intervals for a total range of tions of temperature and rainfall began in the 150 m in elevation and a total of 36 plots Tertiary and continued through the Quaternary across the lower Coleogyne ecotone. The lowest to the present (Bowns 1973). The current com­ ofthe 6 elevations represents Larrea-Ambrosia position and distribution
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