Proceedings of the Desert Fishes Council VOLUME XXXII 2000 ANNUAL SYMPOSIUM 16 - 19 November Death Valley California, U.S.A. Edited by Dean A. Hendrickson Texas Natural History Collection University of Texas at Austin 10100 Burnet Road, PRC 176 / R4000 Austin, Texas 78758-4445, U.S.A. and Lloyd T. Findley Centro de Investigación en Alimentación y Desarrollo, A.C.-Unidad Guaymas Carretera al Varadero Nacional Km. 6.6, “Las Playitas” Apartado Postal 284, Guaymas, Sonora 85400, MÉXICO published: November 13, 2001 ISSN 1068-0381 P.O. Box 337 Bishop, California 93515-0337 760-872-8751 Voice & Fax e-mail: [email protected] MISSION / MISIÓN The mission of the Desert Fishes Council is to preserve the biological integrity of 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 / OFICIALES President: David L. Propst, Conservation Services División, New Mexico Department of Game and Fish, Santa Fe, NM 87504 Immediate Past President: Gary P. Garrett Executive Secretary: E. Phil Pister, P.O. Box 337, Bishop, California 93515-0337 COMMITTEES / COMITÉS Executive Committee: Michael E. Douglas, Gary P. Garrett, Dean A. Hendrickson, Nadine Kanim, Paul C. Marsh, E. Phil Pister, David L. Propst Area Coordinator: Nadine Kanim Awards: David L. Propst Membership: Paul C. Marsh Proceedings Co-Editors: Lloyd T. Findley and Dean A. Hendrickson Proceedings Translation: Miguel Á. Cisneros, Lloyd T. Findley and Gabriela Montemayor Program: Michael E. Douglas (Chair), Dean A. Hendrickson, Nadine Kanim Webmasters: Dean A. Hendrickson and Peter Unmack Local Committees: 2000 (Death Valley National Park, Furnace Creek, California, U.S.A.) E. Phil Pister 2001 (Alpine, Texas, U.S.A.) Nathan Allan and Chris Hoagstrom MEMBERSHIP / MEMBRESÍA 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), $650 (life, single payment), and $1,000 (patron: single payment). Membership applications are available on the website (below). 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, Arizona State Univeristy, Department of Biology, Tempe, AZ 85287-1501, U.S.A. Phone 480/965-2977; FAX 480/965-2519; [email protected]. ABOUT THE PROCEEDINGS OF THE DESERT FISHES COUNCIL / SOBRE LOS PROCEDIMIENTOS DEL CONSEJO DE LOS PECES DEL DESIERTO It is the policy of the Council to select and publish in the annual Proceedings of the Desert Fishes Council abstracts, discussion summaries, business items, resolutions, and other material submitted and presented at the Annual Symposium. Full, Contributed Papers based on works presented at the meetings are also solicited. Authors are responsible for their own technical editing and for any errors caused by failure to follow Instructions to Authors (published on World Wide Web or available from the Proceedings Editor on request). All contributions are subject to editorial review and are published following technical editing and automated electronic processing to standardize format. Only Contributed Papers are subject to peer review for scientific accuracy prior to publication. Proofs of Contributed Papers, but not of abstracts, are provided to authors for review prior to publication. Resolutions are published exactly as passed by the membership in the business meeting of the Annual Symposium. The Proceedings Translation Committee provides original translations of abstracts in English when translations are not provided by authors, and edits all Spanish abstracts provided by authors. This committee accepts full responsibility for errors in translations for those abstracts they translate. The Proceedings are published and delivered to all members of the Desert Fishes Council and subscribing libraries in the year following the Annual Symposium. The Council offers extensive information on the World Wide Web about itself and the organisms and ecosystems it strives to protect: http://www.desertfishes.org Permission to utilize copyrighted artwork on the cover was granted by University of Arizona Press and the artist, Barbara Terkanian. ISSN 1068-0381 The entire DFC Proceedings is printed on recycled paper. PROCEEDINGS OF THE DESERT FISHES COUNCIL - VOLUME XXX1I (2000 SYMPOSIUM) – PUBLISHED NOVEMBER 13, 2001 TABLE OF CONTENTS / TABLA DE CONTENIDOS MISSION / MISIÓN .................................................................................................................. INSIDE FRONT COVER OFFICERS / OFICIALES .......................................................................................................... INSIDE FRONT COVER COMMITTEES / COMITÉS...................................................................................................... INSIDE FRONT COVER MEMBERSHIP / MEMBRESÍA................................................................................................. INSIDE FRONT COVER ABOUT THE PROCEEDINGS OF THE DESERT FISHES COUNCIL / SOBRE LOS PROCEDIMIENTOS DEL CONSEJO DE LOS PECES DEL DESIERTO ............................................................................ INSIDE FRONT COVER TABLE OF CONTENTS / TABLA DE CONTENIDOS............................................................ INSIDE FRONT COVER ABSTRACTS IN ORDER PRESENTED / RESUMENES EN ORDEN DE PRESENTACIÓN.......................................................... 1 ABATE, PD ET AL..................................................................................................................................................... 1 Razorback sucker studies on Lake Mead, Nevada and Arizona, 1999-2000 ......................................................... 1 Estudios del matalote jorobado en el Lago Mead, Nevada y Arizona, 1999-2000................................................. 1 STEFFERUD, SE ET AL............................................................................................................................................... 2 Managing nonnative aquatic species impacts: Implementation of the 1994 Central Arizona Project biological opinion ............................................................................................................................................................... 2 El manejo de impactos de especies acuáticas no nativas: Implementación de la opinión biológica del Proyecto de Arizona Central de 1994 ..................................................................................................................................... 2 BAKER, JR ET AL...................................................................................................................................................... 3 A national program for monitoring stream conditions in the western United States............................................. 3 Un programa nacional para el monitoreo de condiciones de los arroyos en el occidente de los Estados Unidos de Ámérica.............................................................................................................................................................. 3 GURTIN, S AND BRADFORD, R .................................................................................................................................. 4 Habitat characteristics used by razorback suckers released into the Imperial Division, Lower Colorado River, California-Arizona; Phase III synopsis and overview of Phase IV........................................................................ 4 Características del hábitat utilizado por matalotes jorobado liberados en la División Imperial, bajo Río Colorado, California-Arizona; sinopsis de la Fase III y avances de la Fase IV ..................................................................... 4 WEBSTER, T AND UNMACK, PJ.................................................................................................................................. 5 Ash Meadows: a photographic perspective 1938-2000......................................................................................... 5 Ash Meadows [Praderas Ash]: una perspectiva fotográfica de 1938 a 2000 ......................................................... 5 VAN HAVERBEKE, DR.............................................................................................................................................. 6 Selection forces and extinction risk of the humpback chub, Gila cypha, in the Grand Canyon............................. 6 Fuerzas de selección y riesgo de extinción de la carpa jorobada, Gila cypha, en el Gran Cañón........................... 6 WILSON, KP ET AL................................................................................................................................................... 6 Community structure and food web dynamics in Devils Hole, Nevada................................................................. 6 Estructura de la comunidad y dinámica de la trama trófica en Devils Hole, Nevada............................................