7787

• UCREFRP Catalog Number: 7787
• Author: Desert Fishes Council.
• Title: Proceedings of the Desert Fishes Council Volume XXV, 1993 Annual Symposium.
• USFW Year: 1993.
• USFW - Doc Type: D. A. Hendrickson, ed. November, 10 -14.
• Copyright Material: NO

PROCEEDINGS OF THE DESERT FISHES COUNCIL
RINNE, J.". USDA Forest Service, Flagstaff, Arizona
1993 - VOLUME XXV
Abiotic and biotic factors influencing the sustainability of the
threatened Little Colorado spinedace, Lepidomeda vittata
Factores abi6ticos y bioticos que influyen en el mantenimiento del pececito de espina
del Pequeno Rio Colorado, Lepidomeda vittata, especie amenazada
KEYWORDS: Endangered species; Little Colorado spinedace; riparian; Southwest; conservation
CLAVES: Especie en Peligro; Pececito de espina del pequeno rio Colorado; ripario; Suroeste; conservacion
ABSTRACT
Field inventories for the threatened Little Colorado spinedace, Lepidomeda vittata vittata demonstrated an
inverse relationship between this rare native minnow and rainbow trout, Oncorhynchus mykiss. Laboratory studies
demonstrated this salmonid as art efficient predator on spinedace. Field studies using enclosed sections of streams
were designed to 1) corroborate or refute laboratory studies, and 2) verify if inverse distribution pattenrs in Nutrioso
Creek, east-central Arizona was attributable to either predation, physical habitat, or their combination. Data suggest
that spinedace distribution in this stream is a function of the interactions of trout predation and linear changes in
water temperature, dissolved oxygen, and turbidity. Results of study have management implications for conservation
and recovery of the rare spinedace.
RESUMEN
Los inventarios de campo realizados para el pececito de espina del Pequeno Rio Colorado, especie amenazada
Lepidomeda vittata, demostraron que existe una relation inversa entre este pez raro, nativo, y la trucha arcoiris
Oncorhynchus mykiss. Los estudios de laboratorio demostraron que este salmonido es un depredador eficiente del
pececito de espina. Los estudios de campo utilizando secciones encerrados de arroyos fueron designadas a: 1)
corroborar o refutar los estudios de laboratorio y 2) verificar si los patrones inversos de distribucion en el Caft6n
Nutrioso, Arizona este-central, ftieron atribuibles a la depredacion, o al habitat fisico o a la combinacion de ambos.
Los datos sugieren que la distribucion del pececito de espina en el arroyo es una funcion de las interacciones de la
depredacion de la trucha y cambios lineales en ]a temperatura del agua, oxigeno disuelto y turbidez. Los resultados
del estudio tienen implicaciones en el manejo para la recuperacion y conservacion de este raro pececito de espina.
TIiRELOFF, D. U.S. Department of the Interior, National Park Service, Death Valky National Montane.
Using a Global Positioning System (GPS) to map the distribution of the Cottonball Marsh pupfish
Uso del Sistema de Posicionamiento Global (SPG) para mapear distribucion del Cottonball Marsh pupfish
KEYWORDS: Global Positioning System (GPS); Cottonball Marsh pupfish; fish distribution; fish habitat
CLAVES: Sistema de Posicionamiento Global (SPG); Cottonball Marsh pupfish; distribucion de peces; habitat de peces
ABSTRACT
(NOT PRESENTED AT MEETING) Recent technological advances in survey equipment have potential
applications in the fields of biological science. One of the newest and most exciting innovations in this area is the
development of the Global Positioning System (GPS). The availability of this equipment has proven to be
particularly useful in mapping riparian-related resources in Death Valley, California, because many of the wetland
habitats occur in remote locations with few topographic landmarks.
In the fall of 1993, a GPS was used to accurately map the distribution of the Cottonball Marsh pupfish
Cyprinodon salinus milleri for the first time. Riparian habitats which were occupied by the pupfish were found to
occur along a linear line which measured approximately two miles in length. This distribution suggests that the
spatial extent of the pupfish is probably a function of a geological structural control which results from the contact
of permeable alluvial material and denser playa muds.
Pupfish habitats were found to consist of a variety of pool and stream habitats. While the total number of pools
and streams is yet to be quantified, it is likely that pupfish occupy less than a hundred discrete water bodies during
the summer and fall.
RESUMEN
(NO PRESENTADO EN EL CONGRESO) Los recientes avances tecnologicos en los equipos de evaluacion
tienen aplicaciones potenciales en el campo de las ciencias biologicas. Una de las mas nuevas y excitantes
innovaciones en esta area es el desarrollo del Sistema de Posicionamiento Global. La disponibilidad de este equipo
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