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Reproductive Characteristics Of Two Syntopic Lizard Species, Sceloporus Gadoviae And Sceloporus Jalapae (Squamata: Phrynosomatidae), From Tehuacán Valley, Puebla, México, Aurelio Ramírez-Bautista, América L. Ortíz-Cruz, Ma. Del Coro Arizmendi, Jorge Campos
Reproductive Characteristics Of Two Syntopic Lizard Species, Sceloporus Gadoviae And Sceloporus Jalapae (Squamata: Phrynosomatidae), From Tehuacán Valley, Puebla, México, Aurelio Ramírez-Bautista, América L. Ortíz-Cruz, Ma. Del Coro Arizmendi, Jorge Campos
Western North American Naturalist
We studied the reproductive characteristics of 2 syntopic lizard species, Sceloporus gadoviae and Sceloporus jalapae (Phrynosomatidae). Specimens of S. gadoviae (N = 105) and S. jalapae (N = 41) were collected in a tropical arid forest from Tehuacán Valley, Puebla, México. Males of S. gadoviae reached sexual maturity at the same snoutvent length (SVL; 45.0 mm) as S. jalapae, and a similar pattern occurred in females of both species (SVL; 41.0 and 42.0 mm, respectively). Males of S. gadoviae exhibited reproductive activity throughout the year, with a longer activity during the dry (November to May) and part …
Competitive Interactions Between Endangered Kit Foxes And Nonnative Red Foxes, Howard O. Clark Jr., Gregory D. Warrick, Brian L. Cypher, Patrick A. Kelly, Daniel F. Williams, David E. Grubbs
Competitive Interactions Between Endangered Kit Foxes And Nonnative Red Foxes, Howard O. Clark Jr., Gregory D. Warrick, Brian L. Cypher, Patrick A. Kelly, Daniel F. Williams, David E. Grubbs
Western North American Naturalist
We investigated interference and exploitative competition between endangered San Joaquin kit foxes (Vulpes macrotis mutica) and nonnative red foxes (V. vulpes). Seven kit foxes and 16 red foxes were radio-collared and tracked via radiotelemetry near Lost Hills, California. One kit fox was killed by a red fox. Home ranges of the 2 species did not overlap extensively. Although both species used similar habitats, they used different parcels of land. Kit foxes and red foxes primarily consumed rodents on the study site, and dietary overlap was considerable. Red foxes also may have been using dens formerly used …
Notes On Significant Collections And Additions To The Flora Of Glen Canyon National Recreation Area, Utah And Arizona, Between 1992 And 2004, John R. Spence
Notes On Significant Collections And Additions To The Flora Of Glen Canyon National Recreation Area, Utah And Arizona, Between 1992 And 2004, John R. Spence
Western North American Naturalist
Symphyotrichum expansum (Puepp ex Spreng.) Nesom is reported new to Utah from the Escalante River drainage. A major range extension is reported for Aralia racemosa L. in the Escalante drainage, and additional populations are reported of the rare species Imperata brevifolia Vasey in Utah, including the 1st record for the Grand Staircase–Escalante National Monument. Heterotheca grandiflora Nutt. is reported new to north central Arizona. New locations and notes on an additional 22 rare species in Glen Canyon National Recreation Area are listed.
Fish Assemblage Structure Following Impoundment Of A Great Plains River, Michael C. Quist, Wayne A. Hubert, Frank J. Rahel
Fish Assemblage Structure Following Impoundment Of A Great Plains River, Michael C. Quist, Wayne A. Hubert, Frank J. Rahel
Western North American Naturalist
Understanding the upstream and downstream effect of impoundments on stream fish assemblages is important in managing fish populations and predicting the effects of future human activities on stream ecosystems. We used information collected over a 41-year period (1960–2001) to assess changes in fish assemblage structure resulting from impoundment of the Laramie River by Grayrocks Reservoir. Prior to impoundment (i.e., 1960–1979), fish assemblages were dominated by native catostomids and cyprinids. After impoundment several exotic species (e.g., smallmouth bass [Micropterus dolomieu], walleye [Sander vitreus; formerly Stizostedion vitreum], yellow perch [Perca flavescens], brown trout [Salmo …