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DFC PROCEEDINGS -ABSTRACTS AND CONTRIBUTED PAPERS IN ORDER PRESENTED
<br />HOBBES,A.L.* ; PROPST,D.L. (ALH and DLP - New Mexico Department of Game and Fish, Santa Fe, NM)
<br />Status and distribution of Zuni bluehead sucker in the Zuni River drainage, New Mexico,
<br />Estatus y distribution del matalote cabeza azul del Rio Zuni en la cuenca del Rio Zuni, Nuevo Mexico
<br />KEYWORDS: Zuni bluehead sucker; Zuni River drainage; New Mexico; status; distribution
<br />ABSTRACT
<br />Zuni bluehead sucker Catostomus discobolus yarrowi is a naturally occurring hybrid of bluehead sucker
<br />Catostomus discobolus and Rio Grande sucker Catostomus plebeius endemic to the upper Little Colorado River
<br />drainage, New Mexico and Arizona. In New Mexico, its historical distribution was documented in the Zuni River
<br />downstream and upstream of the Pueblo of Zuni and moderate numbers were collected in the two principal
<br />tributaries, the Rios Nutria and Pescado. Recent collecting efforts indicate that the sucker has declined dramatically
<br />in the Rio Pescado and it is absent in several formerly inhabited reaches of the Rio Nutria. The upper Rio Nutria
<br />and two headwater tributaries, Aqua Remora and Tampico Spring, support several, numerically small, isolated
<br />populations. Fish occur in largely sediment-free reaches containing bedrock or large boulders, and the size structure
<br />of populations in these reaches indicates presence of several year classes and successful reproduction and
<br />recruitment. Imperilment of Zuni bluehead sucker is due to efforts during the mid-1900's to eradicate "undesirable"
<br />fishes from the Zuni River drainage, poor land management practices, construction of reservoirs, and the
<br />introduction of non-native fish species. Zuni bluehead sucker is listed as New Mexico State Endangered, Group
<br />2, and is a candidate for listing by the U.S. Fish and Wildlife Service. Recovery of the subspecies into large
<br />portions of its former range is unlikely due to currently degraded watershed conditions. However, cooperation and
<br />involvement of private landowners, tribal, state, and federal agencies is helping to ensure conservation of extant
<br />populations of the Rio Nutria drainage.
<br />CLAVES: Matalote cabeza azut del Rio Zuni; drenaje del Rio Zuni; Nuevo Mtsxico; estatus; distribuci6n
<br />RESUMEN
<br />El Zuni bluehead sucker (Catostomus discobolus yarrowi) es un hibrido que proviene en forma natural de
<br />bluehead sucker (Catostomus discobolus y de Rfo Grande sucker (Catostomus plebeius) end6mico de la parte
<br />superior de la cuenca del Pequeiio Rfo Colorado (Little Colorado River), en Nuevo Mexico y Arizona. En Nuevo
<br />Mexico, su distribuci6n historica fue documentada en el Rfo Zuni rio arriba y rio abajo del Pueblo de Zuni y fueron
<br />colectados en cantidades moderadas en los dos principales tributarios, los rfos Nutria y Pescado. Las colectas
<br />recientes indican que el matalote ha declinado dramaticamente en el Rfo Pescado y esta ausente en varios recodos
<br />que habitaba antiguamente en el Rfo Nutria. La parte superior del Rio Nutria y las cabeceras de dos tributarios
<br />Aqua Remora y Tampico Spring, soportan varias poblaciones aisladas, num6ricamente pequenas. Los peces ocurren
<br />en grandes extensiones libres de sedimento, que contienen rocas o grandes cantos rodados, y la estructura por
<br />tamanos de las poblaciones que alcanza en estos areas, indica la presencia de varias clases anuales y 6xito en
<br />reproduccion y reclutamiento. El peligro para el Zuni bluehead sucker es debido a los esfuerzos, a mediados de
<br />1900, por erradicar peces "indeseables" de la cuenca del Zuni River, a las practicas deficientes de manejo de las
<br />tierras, a la construcci6n de embalses y a la introduccion de especies no nativas. El Zuni bluehead sucker esta
<br />enlistado come especie en peligro en el Estado de Nuevo M6xico, en el grupo 2, y es candidato para enlistarse por
<br />el Servicio de Fauna y Pesca de los Estados Unidos. La recuperaci6n de las subeppecies dentro de las grandes
<br />porciones de su antiguo registro es improbable actualmente debido a las condiciones de degradaci6n de las cuencas.
<br />Sin embargo, la cooperacion y el involucramiento de propietarios privados, tribus, y agencias estatales y federales,
<br />esta ayudando a asegurar la conservacion de las poblaciones intactas de la cuenca del Rfo Nutria.
<br />HUTCHISON,A.lrl. (AMH - Arizona State University, Department of Zoology, Tempe, AZ)
<br />Inter- and intraspecific relationships of flannelmouth sucker (Catostomus latipinnis) based on mtDNA
<br />Relaciones inter- a intraespecificas del matalote boca franela (Catostomus latipinnis) basado en ADNmt
<br />KEYWORDS: mtDNA; restriction mapping; phylogenetics
<br />ABSTRACT
<br />Morphological divergence within Catostomus latipinnis has caused some speculation as to the specific status
<br />of some its forms. Fifteen restriction enzymes with 6-base recognition sequences were used to analyze variation
<br />among five populations of Catostomus latipinnis from the Colorado River basin, including 2 populations of the
<br />reputed Little Colorado river form (Catostomus sp.). Other species (Catostomus ardens, Catostomus insignis,
<br />Catostomus commersoni and Pantosteus plebeius) were also analyzed to determine relationship (C. insignis) (C.
<br />ardens, C. commersoni and P. plebeius) to C. sp.. Restriction maps were constructed to establish homologous sites
<br />among populations analyzed. Data suggest that there is little genetic differentiation among C. latipinnis populations
<br />and that variation within C. sp. populations is similar to variation within populations of C. latipinnis.
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