1999 DFC Proceedings

Proceedings of the

Desert Fishes Council

VOLUME XXXI

1999 ANNUAL SYMPOSIUM

18 - 21 November

Ciudad Victoria

Tamaulipas, México

Co-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

Miramar 59-A, Colonia Miramar, Guaymas, Sonora 85450, MÉXICO

published: November 1, 2000 by

Desert Fishes Council, P.O. Box 337 u Bishop, California 93515-0337 u 760-872-8751 Voice & Fax u e-mail: phil at desertfishes dot org

ISSN 1068-0381

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: Gary P. Garrett, HOH Research Station, Texas Parks and Wildlife Department, Ingram, Texas 78025

President-elect: David L. Propst, Conservation Services División, New Mexico Department of Game and Fish, Santa Fe, NM 87504

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

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 and Lloyd T. Findley, assisted by Gabriela Montemayor

Program: Michael E. Douglas (Chair), Dean A. Hendrickson, Nadine Kanim

Webmasters: Dean A. Hendrickson and Peter Unmack

Local Committees: 1999 (Ciudad Victoria, Tamaulipas, México) Francisco Garcia de León

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; fish.dr_at_asu.edu.

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.