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Proceedings of the Desert Fishes Council Proceedings of the Desert Fishes Council VOLUME XXVI 1994 ANNUAL SYMPOSIUM 17 to 20 November Death Valley National Park Furnace Creek California U.S.A. Edited by Dean A. Hendrickson Texas Natural History Collection / R4000 University of Texas Austin, TX 78712-1100 Publication date: September 30, 1995 ISSN 1068-0381 P.O. Box 337 • Bishop, California 93515-0337 • (619) 872-8751 Voice and Fax MISSION The mission of the Desert Fishes Council is to preserve the biological integrity of North America's desert aquatic ecosystems and their associated life forms, to hold symposia to report related research and management endeavors, and to effect rapid dissemination of information concerning activities of the Council and its members. OFFICERS Chairman: Dean A. Hendrickson, Texas Natural History Collection/R4000, University of Texas, Austin, Texas Chairman-elect: vacant Executive Secretary: E. P. Pister, Bishop, CA, U.S.A. COMMITTEES Awards: Gary K. Meffe Membership: Paul C. Marsh Proceedings: Dean A. Hendrickson (Chair/Editor) Proceedings Translation sub-committee (Dr. Samuel Ocaña, Director, Centro Ecológico de Sonora, sponsor): Biol. Guadalupe Morales-Abril (Chair), Biol. Mar. Andrés Villarreal Lizárraga, Ecól. Elvira Rojero Díaz, Biol. Mar. Alejandro Varela Romero, Biol. Eduardo López Saavedra, Ecól. José Martín E. Haro Rodríguez, Biol. Iván Eduardo Parra Salazar, Biol. Florentino Garza Salazar, Biol. Cristina Meléndez Torres, Ecól. María Isabel Granillo, Dr. Dean A. Hendrickson Program: Michael E. Douglas (Chair), Dean A. Hendrickson, Nadine Kanim Resolutions: Walter R. Courtenay, Jr. Local Committees: 1995 (Reno, Nevada, U.S.A.) Glenn Clemmer, Randy McNatt; 1996 (La Paz, Baja California, México) Francisco Reynoso-Mendoza; 1997 (Death Valley National Park, Furnace Creek, California, U.S.A.) E. Phil Pister. MEMBERSHIP Membership in the Desert Fishes Council is open to any person or organization interested in or engaged in the management, protection, or scientific study of desert fishes, or some related phase of desert fish conservation. Membership includes subscription to the Proceedings of the Desert Fishes Council. Annual dues are $25 (regular: domestic or foreign), $15 (student), $35 (family: 1 Proceedings), >$35 (sustaining) and $1000 (patron: single payment). Send dues payments and general contributions along with address information (including affiliation, voice, fax, and e-mail) and indication of permission to include this information in a published directory of the Desert Fishes Council to: Paul C. Marsh, Membership Chair, Center for Environmental Studies, Arizona State University, Tempe, AZ 85287-3211 USA (602/965-2977 FAX 602/965-8087/ Internet [email protected] ABOUT PROCEEDINGS OF THE DESERT FISHES COUNCIL It is the policy of the Council to publish in the annual Proceedings of the Desert Fishes Council papers, abstracts, discussion summaries, business items, resolutions, and other material submitted for presentation, whether actually presented at the Annual Symposium or not. The Proceedings are published and delivered to all members of the Desert Fishes Council and subscribing libraries in the year following the Annual Symposium. All contributions are published as received following automated electronic processing designed to standardize format only. Authors are responsible for their own technical editing and for any errors caused by failure to follow Instructions to Authors (published in each volume). Proofs are not provided to authors for review prior to publication, and neither abstracts nor full papers are subjected to peer review. Resolutions are published exactly as passed by the membership in the business meeting of the annual symposium. The Translation Subcommittee of the Proceedings Committee accepts responsibility for errors in translations to Spanish for those abstracts they translate. This committee provides original translations of all abstracts and resolutions when translations are not provided by authors, and edits all Spanish abstracts provided by authors. Translations to English of all abstracts received only in Spanish are done by the editor and reviewed by the Translations Subcommittee. The Desert Fishes Council offers extensive information on the World Wide Web about itself and the organisms and ecosystems it strives to protect: http://www.utexas.edu/depts/tnhc/.www/fish/dfc/dfc_top.html Permission to utilize copyrighted material in this volume was granted by University of Arizona Press and artist Barbara Terkanian (cover art), and University of Nevada Press, Reno (line drawings of fishes). Matt J. Stephens provided his original drawing of Cichlasoma minckleyi. ISSN 1068-0381 The entire DFC Proceedings is printed on recycled paper. PROCEEDINGS OF THE DESERT FISHES COUNCIL, 1994 SYMPOSIUM VOLUME XXVI - published 1995 HUBBS,C. (Department of Zoology, The University of Texas at Austin, Austin, 78712, TX, U.S.A.) Further on Gambusia cannibalism Más sobre el canibalismo de Gambusia KEYWORDS: predation; cannibalism; mosquitofish; geographic variation; Poeciliidae ABSTRACT Gambusia predation on newborn poeciliids is about 70% for females and 30% for males = half of the young survive for a month isolated with a predator. Predation is very high when adults of Gambusia nobilis, Gambusia gaigei, Gambusia heterochir, Gambusia geiseri, or Gambusia longispinis are used and low when Gambusia affinis or Gambusia speciosa are used as predators. Three species have had multiple populations studied; G. affinis, G. nobilis, and G. geiseri. The first two show much more interpopulation variation than does G. geiseri. CLAVES: predación; canibalismo; pez mosquito; variación geográfica; Poeciliidae RESUMEN La predación en poecilidos recién nacidos es de aproximadamente 70% en hembras y 30% para machos = la mitad de los jóvenes sobreviven un mes aislados con un depredador. La predación es muy alta cuando los adultos de Gambusia nobilis, Gambusia gaigei, Gambusia heterochir, Gambusia geiseri, o Gambusia longispinis son usados y poco cuando Gambusia affinis o Gambusia speciosa son usadas como predadores. Tres especies han tenido múltiples poblaciones estudiadas; G. affinis, G. nobilis, y G. geiseri. Las primeras dos muestran mucho más variación interpoblacional que G.geiseri. * REYNOSO-MENDOZA,F. ; BARJAU-GONZALEZ,E. (Museo de História Natural, Universidad Autónoma de Baja California Sur, A.P. 219-B, La Paz 23080, Baja California Sur, México) Fishes of the continental waters of Baja California Sur, México, in the collection of the Natural History Museum of the Universidad Autónoma de Baja California Sur Peces de aguas continentales de Baja California Sur, México, en la colección del Museo de Historia Natural de la Universidad Autónoma de Baja California Sur KEYWORDS: ichthyological collections; museums; Baja California Sur; México; freshwaters; fishes; fish collections ABSTRACT The Ichthyological Collection in The Natural History Museum of the Universidad Autónoma de Baja California Sur, up to date, has specimens from the ponds or "tinajas" of eight arroyos of the State of Baja California Sur. These are of the families: Cyprinidae, Cyprinodontidae, Poeciliidae, Mugilidae, Gobiidae, Eleotridae, Cichlidae. CLAVES: Colecciones ictiológicas; museos; Baja California Sur; México; aguas continentales; peces; Colecciones de peces RESUMEN La Colección Ictiológica del Museo de Historia Natural de la U.A.B.C.S. hasta la fecha cuenta con ejemplares de peces colectados en las pozas o tinajas de ocho arroyos del Estado de Baja California Sur, que corresponden a las familias Cyprinidae, Cyprinodontidae, Poeciliidae, Mugilidae, Gobiidae, Eleotridae, Cichlidae. 1 DFC PROCEEDINGS - ABSTRACTS AND CONTRIBUTED PAPERS IN ORDER PRESENTED * ALDER,L. ; CROWL,T.A. (LA and TAC - Ecology Center and Department of Fisheries and Wildlife, Utah State University, Logan, UT) Energy flow in the Green River, upper Colorado River basin: A foodweb approach Flujo de energía en el Río Green, Cuenca Alta del Río Colorado: la cadena alimenticia KEYWORDS: community dynamics; foodweb dynamics; predation; competition; non-native fishes; Utah; Colorado River; Green River ABSTRACT The Upper Colorado River is dominated by non-native fishes which we suggest negatively impact the survival of Colorado squawfish. These impacts result from competition for food as well as direct predation, especially on YOY and juvenile (2 - 5 year) squawfish. Cage experiments suggest that smallmouth bass, small channel catfish and green sunfish are particularly problematic. Given the excessive domination (both in terms of densities and biomass) of the foodweb by non-native fishes, we hypothesize that the overall energy balance in the upper basin system has been altered dramatically. We suggest that most of the energy (at all levels) now flows through the non-native components of the foodweb and that a few species in particular represent resource sinks. As a first step toward testing this hypothesis, we present a foodweb model developed from three years of data. These data represent quantitative assessments of the entire fish community, including densities, biomass, body length/gape size relationships and stomach analyses collected in a 70 mile reach of the Green River. The results estimate a previously unquantified measure of native and non-native fish distribution and density in this river section. CLAVES: dinámica de comunidades; dinámica de la cadena alimenticia; depredación; competencia; peces no nativos; Utah; Río Colorado; Río Green RESUMEN El Alto Río Colorado esta dominado por
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