THE SOUTHWESTERN NATURALIST ANTHONY A. ECHELLE, Managing Editor Davip J. HAFNER, Associate Editor for Mammals ELMER J. Finck, Associate Editor for Birds STANLEY F. Fox, Associate Editor for Herps Rosert J. Epwarps, Associate Editor for Fishes KENNETH W. Stewart, Associate Editor for Invertebrates FreD E. Smeins, Associate Editor for Botany (Ecology) RAHMONA A. THOMPSON, Associate Editor for Botany (Taxonomy) STANLEY F. Fox, Associate Editor for Spanish Manuscripts VoLuME 39 PUBLISHED QUARTERLY BY THE SOUTHWESTERN ASSOCIATION OF NATURALISTS SOUTHWESTERN ASSOCIATION OF NATURALISTS President President-Elect MICHAEL L. KENNEDY WILLIAM J. MATTHEWS DEPT. OF BIOLOGY BIOLOGICAL STATION AND DEPT. OF ZOOLOGY MEMPHIS STATE UNIV. UNIV. OF OKLAHOMA MEMPHIS, TN 38152 KINGSTON, OK 73439 Secretary Treasurer LAURA L. JANECEK PAULA WILLIAMSON SAVANNAH RIVER EcoLOGY LABORATORY DEPT. OF BIOLOGY DRAWER E SOUTHWEST TEXAS STATE UNIV. AIKEN, SC 29802 San Marcos, TX 78666 EDITORIAL STAFF Managing Editor ANTHONY A. ECHELLE DEPT. OF ZOOLOGY OKLAHOMA STATE UNIV. STILLWATER, OK 74078 Associate Editor, Mammals Associate Editor, Invertebrates Davip J. HAFNER KENNETH W. STEWART NEw MEXICO MUSEUM OF NATURAL HISTORY DEPT. OF BIOL. Sci. 1801 MOUNTAIN Rp., NW UNIV. OF NORTH TEXAS ALBUQUERQUE, NM 87104-1375 DENTON, TX 76203 Associate Editor, Birds Associate Editor, Botany ELMER J. Finck FRED E. SMEINS (Plant Ecology) DEPT. OF BIOLOGICAL SCIENCES DEPT. OF RANGELAND ECOLOGY AND EMPORIA STATE UNIVERSITY MANAGEMENT EMPORIA, KS 66801 Texas A&M UNIV. COLLEGE STATION, TX 77843 Associate Editor, Herps Associate Editor, Botany STANLEY F. Fox RAHMONA A. THOMPSON (Plant Taxonomy) DEPT. OF ZOOLOGY DEPT. OF BIOLOGY OKLAHOMA STATE UNIV. East CENTRAL STATE UNIV. STILLWATER, OK 74078 ADA, OK 74078 Associate Editor, Fish Associate Editor, Spanish ROBERT J. EDWARDS STANLEY F. Fox DEPT. OF BIOLOGY DEPT. OF ZOOLOGY Univ. OF TEXAS-PAN AMERICAN OKLAHOMA STATE UNIV. EDINBURG, TX 78539 STILLWATER, OK 74078 BOARD OF GOVERNORS Class of 1995 Troy L. BesT EDIE MARSH AUBURN UNIVERSITY ANGELO STATE UNIVERSITY ROBERT C. DOWLER LYNN W. ROBBINS ANGELO STATE UNIVERSITY SOUTHWEST MISSOURI STATE UNIVERSITY Class of 1996 Davip R. Epps KAREN MCBEE EMPORIA STATE UNIVERSITY OKLAHOMA STATE UNIVERSITY SARAH B. GEORGE ROBERT D. OWEN UNIVERSITY OF UTAH TEXAS TECH UNIVERSITY Class of 1997 WILLIAM H. BALTOSSER DwIGHT W. MOORE UNIV. OF ARKANSAS AT LITTLE ROCK EMPORIA STATE UNIV. ALICE F. ECHELLE CARYN C. VAUGHN OKLAHOMA STATE UNIV. UNIVERSITY OF OKLAHOMA The Southwestern Association of Naturalists was founded in May 1953 to promote the field study of plants and animals (living and fossil) in the southwestern United States, Mexico, and Central America and to aid in the scientific activities of its members. The Association holds an annual meeting with field trips and publishes THE SOUTHWESTERN NATURALIST. Membership is open to all persons interested in natural history. THE SOUTHWESTERN NATURALIST (ISSN 0038-4909) is published quarterly by The Southwestern Association of Naturalists, Department of Biology, Southwest Texas State University, 601 University Drive, San Marcos, TX 78666. Subscription rates are $25 for regular members, $15 for student members, $33 for family members, $30 for sustaining members, and $35 for institutional members. Second-class postage paid at San Marcos, TX, and additional office. POSTMASTER: Send address changes to the Southwestern Association of Naturalists, % Dr. Paula Williamson, Department of Biology, Southwest Texas State University, 601 University Drive, San Marcos, TX 78666. NOTICE TO MEMBERS All second-class mail must include the ZIP code. If your address does not show your correct ZIP code, please insert the code on the addressed envelope, along with any other corrections, and mail it to the Treasurer. CONTENTS OF VOLUME 39 NUMBER 1 Mammalian species composition, diversity, and succession in conservation reserve program grasslands. Dianne L. Hall and Michael R. Willig Distribution of the threatened leopard darter, Percina pantherina (Osteichthyes: Percidae). Alexander V. Zale, Stuart C. Leon, Matthew Lechner, O. Eugene Maughan, Mark T. Ferguson, Steve O”Donnell, Brenda James, and Paul W. James Aposematic coloration in Dactylotum variegatum (Orthoptera: Acrididae): support from verte- brate feeding trials. Paul R. Neal, Mark R. Stromberg, and Karen A. Jepson-Innes Are cicadas (Diceroprocta apache) both a “keystone” and a “critical-link” species in lower Colorado River riparian communities? Douglas C. Andersen Clonal diversity patterns in marginal populations of the geographically restricted shrub Neviusia alabamensis (Rosaceae). Kenneth J. Freiley The type locality of Sceloporus torquatus minor Cope, 1885 (Sauria: Iguanidae). Robert G. Webb and Ralph W. Axtell Microscopic eggshell characteristics in the collared lizard, Crotaphytus collaris (Sauria: Cro- taphytidae). Stanley E. Trauth, Chris T. McAllister, and Wei Chen Recolonization of wildlife on a coal strip-mine in northwestern New Mexico. Terry T. Ireland, Gale L. Wolters, and Sanford D. Schemnitz Utilization of coarse woody debris by Ephemeroptera in three Ozark streams of Arkansas. Edward C. Phillips and Raj V. Kilambi Biochemical variation in Alpheus (Decapoda, Caridea, Alpheidae) from the coast of Texas: evidence for cryptic species. Matthew R. McClure and Ira F. Greenbaum Trends in California mountain lion populations. K. Shawn Smallwood Components of northern bobwhite brood habitat in southern Texas. /. Scott Taylor and Fred S. Guthery Factors affecting loss in mass of creosotebush leaf-litter on the soil surface in the northern Chihuahuan Desert. W. P. MacKay, S. J. Loring, J. C. Zak, S. I. Silva, F. M. Fisher, and W. G. Whitford New psocids (Insecta: Psocoptera) from Socorro Island, Revillagigedo Archipelago, Mexico. Alfonso Neri Garcia Aldrete Notes Characteristics of Ponderosa pines and Abert squirrel herbivory. W. Sylvester Allred and Wiiliam S. Gaud Food-item use by coyotes at the Naval Petroleum Reserves in California. Brian L. Cypher, Kenneth A. Spencer, and Jerry H. Scrivner Movements and nesting habitat of lesser prairie-chicken hens in Colorado. Kenneth M. Giesen Current status of the rice rat, Oryzomys couesi peninsularis. Sergio Ticul Alvarez-Castañeda ... Announcements NUMBER 2 Distribution and abundance of the Mexican lampreys (Petromyzontidae: Lampetra: subgenus Tetrapleurodon). John Lyons, Philip A. Cochran, Oscar J. Polaco, and Evodio Merino- Nambo Changes in competition between a C, grass and a woody legume with differential herbivory. O. W. Van Auken Ecophysiology of three C, perennial grasses in the northern Chihuahuan Desert. R. S. Senock, D. L. Devine, W. B. Sisson, and G. B. Donart iii Species diversity, selectivity, and habitat associations of small mammals from coastal California. Gary M. Fellers An assessment of riparian environmental quality by using butterflies and disturbance suscep- tibility scores. S. Mark Nelson and Douglas C. Andersen Effects of diet composition and ambient temperature on food choice of captive mallards. C. Brad Dabbert and Thomas E. Martin Geographic variation in morphology of spikedace, Meda fulgida, in Arizona and New Mexico. Allison A. Anderson and Dean A. Hendrickson Reproductive characteristics of Merriam’s pocket gopher (Pappogeomys merriami merriami) from Huitzilac, Morelos, Mexico (Rodentia: Geomyidae). Beatriz Villa-C. and Richard M. Engeman Ecological conditions and the notonectid-fairy shrimp interaction. B. D. Woodward and J. Kiesecker Correlations between fecal nitrogen and diet composition in free-ranging black-tailed deer. Brian N. Massey, Floyd W. Weckerly, Charles E. Vaughn, and Dale R. McCullough Notes List of reptiles of Morelos, Mexico, and their distribution in relation to vegetation types. Rubén Castro-Franco and Maria Guadalupe Bustos Zagal Observations on long-nosed bats (Leptonycteris) in New Mexico. Reginald A. Hoyt, J. Scott Altenbach, and David J. Hafner Natural regeneration in encinal woodlands of southeastern Arizona. Simone Borelli, Peter F. Ffolliott, and Gerald J. Gottfried Current status of terrestrial birds on the islands of Mono Lake, California. Linnea S. Hall, Michael L. Morrison, and William M. Block Latitudinal differences in sex ratios among nonbreeding western sandpipers in Puerto Rico and Ecuador. Brian A. Harrington and Ben Haase Timing of remigial molt in fulvous whistling ducks nesting in Louisiana. William L. Hohman and David M. Richard Growth and survivorship of Moapa dace (Osteichthyes: Cyprinidae: Moapa coriacea) in an isolated stream reach on Moapa National Wildlife Refuge. G. Gary Scoppettone and Howard L. Burge Investigator visitation and predation rates on bird nests in burned and unburned tallgrass prairie in Oklahoma: an experimental study. Paul Hendricks and Dan L. Reinking Suppression of saguaro cactus flower-bud formation by roosting vultures in Arizona. Peter S. Bennett and Michael R. Kunzmann Helminths from mallard ducks, Anas platyrhynchos, wintering in the post-oak savannah of southcentral Texas. Norman O. Dronen, James R. Lindsey, Lisa M. Ross, and George M. Predation by dipteran larvae on fairy shrimp (Crustacea: Anostraca) in Utah rock-pools. Tim B. Graham Effects of predator exclusion on rodent abundance in an Arizona semidesert grassland. Carl E. Bock and Jane H. Bock Noteworthy record of the western small-footed Myotis (Mammalia: Chiroptera: Myotis cilto- labrum). Ricardo López-Wilchis, Gerardo López-Ortega, and Robert D. Owen Longevity of Illinois bundle flower (Desmanthus illinoensis) seeds. Ralph W. Kelting Announcements NUMBER 3 Seasonal variation in habitat use by the Neosho Madtom (Teleostei: Ictaluridae: Noturus placidus). Linda Fuselier and David Edds Distribution and status of the Chihuahua chub (Teleostei: Cyprinidae: Gila nigrescens), with notes on its ecology and associated species. David L. Propst and Jerome A. Stefferud ... Hybrid Cnemidophorus (Sauria: Teiidae) in Ninemile Valley of the Purgatoire River, Colorado. James M. Walker, Harry L. Taylor, and James E. Cordes Molecular systematics of the genus Pimephales (Teleostei: Cyprinidae). Timothy R. Schanid, Thomas E. Dowling, and John R. Gold Summer emergence of mayflies, stoneflies, and caddisflies from a Colorado mountain stream. R. Edward DeWalt, Kenneth W. Stewart, Stephen R. Moulton II, and James H. Kennedy Demography and status of the island fox and the island spotted skunk on Santa Cruz Island, California. Kevin Crooks Spatial, seasonal, and diel variation in abundance of the bay anchovy, Anchoa mitchilli (Teleostei: Engraulidae), in a tropical coastal lagoon of Mexico. Manuel Castillo-Rivera, Griselda Moreno, and Rodolfo Iniestra Fawning habitat of desert mule deer. Kevin B. Fox and Paul R. Krausman Systematics and zoogeography of the Mer Rouge pocket gopher (Geomys breviceps breviceps) based on cytochrome-b sequences. James W. Demastes Notes Two small mammals new to the fauna of El Salvador. Mark D. Engstrom, Burton K. Lim, and Fiona A. Reid Chromosomal variation in Mexican populations of the Genus Dendroctonus (Coleoptera: Sco- lytidae). Yolanda Salinas-Moreno, Gerardo Zuniga-Bermudez, and Ramon Cisneros- Barrios Great horned owl food habits at Mono Lake, California. Paul A. Aigner, Michael L. Morrison, Linnea S. Hall, and William M. Block A problematic specimen of Peromyscus with an unusual karyotype. Steven A. Smith, Ira F. Greenbaum, and David J. Schmidly The effect of box-trap design on rodent captures. Eric E. Jorgensen, Stephen Demarais, and William R. Whitworth Color preference of the island endemic lizard Uta palmeri in relation to rat eradication cam- paigns. Bernie R. Tershy and Dawn Breese Diurnal aggregation of banded geckos under field conditions. Russell L. Burke Observations on mountain plover (Charadrius montanus) breeding in Utah. Keith S. Day ... Morphometric comparison of pupfish populations, Cyprinodon nevadensis, at Shoshone and Tecopa, California. Frances R. Taylor and John W. Pedretti Natural cactus spine injury in the tree lizard, Urosaurus ornatus (Phrynosomatidae). Stephen R. Goldberg, H. J. Holshuh, George A. Middendorf III, and Naida Zucker Mountain lion predation on pronghorn in central Arizona. Richard A. Ockenfels Announcements NUMBER 4 Development of the tail autotomy adaptation in lizards under disparate levels of predation at high and low elevations in Mexico. Stanley F. Fox, Susana Perea-Fox, and Rubén Castro Population declines of the native frog, Rana muscosa, in Sequoia and Kings Canyon National Parks, California. David F. Bradford, David M. Graber, and Farinaz Tabatabai Geographic variation in sexual dimorphism in the collared lizard, Crotaphytus collaris (Sauria: Crotaphytidae). /. Kelly McCoy, Stanley F. Fox, and Troy A. Baird Pollination biology of Abronia macrocarpa (Nyctaginaceae), an endangered Texas species. Paula S. Williamson, Lisa Muliani, and Gena K. Janssen Long-term grazing influences on Chihuahuan Desert rangeland. Jerry L. Holechek, Ackim Tembo, Alipayou Daniel, Michael J. Fusco, and Manuel Cardenas Vv Effects of Abert Squirrel herbivory on foliage and nitrogen losses in Ponderosa pine. Sylvester Allred and William S. Gaud Den-site selection in the island spotted skunk of Santa Cruz Island, California. Kevin R. Double captures of small mammals in single-capture traps: random encounters or social trav- eling? James F. Taulman, Ronald E. Thill, and James H. Williamson Pocket gopher herbivory and mortality of ocotillo on stream terrace, bajada, and hillside sites in the Colorado Desert, southern California. George W. Cox and Jodee Hunt Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions. Michael J. Horn, Pau! C. Marsh, Gordon Mueller, and Tom Burke Notes Undescribed subspecies of red-tailed hawk from Baja California. Robert W. Dickerman Observations of nest construction and bathing behaviors in the nine-banded armadillo, Dasypus novemcinctus. James F. Taulman Faunal use of nest boxes in the Ouachita Mountains of central Arkansas. Paul T. Caster, Gary A. Heidt, and Karen D. Stone The effect of bot fly (Cuterebra) infestation on cold-night trap mortality in cactus mice (Pero- myscus eremicus). Lyle B. Nichols Evidence of a symbiotic relationship between cellulolytic bacteria and a freshwater herbivorous turtle. R. Brent Thomas, Don Moll, and Jack Steiert Collection of Age-0 razorback suckers (Xyrauchen texanus) in the lower Green River, Utah. F. Brandt Gutermuth, Leo D. Lentsch, and Kevin R. Bestgen Effects of temperature on escape behavior in the cribellate spider, Oecobius annulipes (Araneae, Oecobiidae). Vincent A. Cobb Winter specimen of the common loon (Gavia immer) from the state of Hidalgo, Mexico. Patricia Ramírez B., Atahualpa E. Desucre-Medrano, Adolfo G. Navarro S., Pedro J. Romo O., and Hugo J. Castro Announcements Index to Volume 39 E