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Results 401 - 450 of 1011
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Eckermann-Ross, Christine - - 2011
Bean, Preston - - 2011
Stream flow modifications, such as reduced spring flow and construction of low-head dams, have led to declines in the headwater catfish (Ictalurus lupus) across much of its range, as has competition with channel catfish (I. punctatus). Hybridization between headwater catfish and channel catfish also poses a threat to the headwater ...
Varela-Romero, Alejandro - - 2011
To appraise conservation status of the Yaqui catfish Ictalurus pricei, we reviewed literature and unpublished records on a captive stock, examined voucher specimens at museums, re-sampled historical localities in the Yaqui, Mayo, and Fuerte river basins, and we surveyed rivers further south. A total of 72 specimens of native Ictalurus ...
Pech, Louis - - 2011
We collected a Dirhinus texanus (Hymenoptera: Chalcididae) in Salt Creek Canyon, Canyonlands National Park, San Juan County, Utah. This is the first record for D. texanus in Utah.
Schwertner, T. - - 2011
In 1995, we caught three Texas antelope squirrels (Ammospermophilus interpres) at two sites near Brackettville, Kinney County, Texas. One was captured in a habitat atypical for the species. This is the easternmost record and first record of the species in Kinney county.
Farr, William - - 2011
The occurrence and distribution of Hemidactylus frenatus (common house gecko) in Mexico is known from dozens of miscellaneous notes, regional accounts, and unpublished records in museums that span >100 years. This information is gathered here, summarized, and mapped to document current distribution of the species in Mexico. A chronology of ...
Deaton, Raelynn - - 2011
I tested effects of infection by the parasitic larval nematode Eustrongylides iggnotus on reproduction in the livebearing western mosquitofish Gambusia affinis. Generally, parasitized females had fewer developing broods than nonparasitized females. Parasitic nematodes significantly reduced fecundity in the western mosquitofish.
Harris, Arthur - - 2011
Pleistocene and Holocene fossils of the yellow-nosed cotton rat (Sigmodon ochrognathuss) in New Mexico, Trans-Pecos Texas, and southern Chihuahua indicate past presence within the currently occupied geographic range, as well as occurrences at lower-elevation sites. Suggestions that post-Pleistocene colonization may account for occurrence of northern isolated populations cannot be falsified ...
Carmona, Roberto - - 2011
We describe the migratory pattern of black terns (Chlidonias niger) in the Ojo de Liebre-Guerrero Negro coastal-lagoon complex and Guerrero Negro saltworks on the Pacific coast of Baja California Sur, Mexico. Most black terns (97% of total) were seen July-October, with 6,700 birds being the highest count per month (September). ...
Griffis-Kyle, Kerry - - 2011
We examined spatial extent of habitat that anaxyrids responded to in an arid environment. We used surveys of vocalizations and searches to identify toads after rainfall events to examine whether the spatial arrangement and proximity of earthen tanks could influence breeding populations of Anaxyrus cognatus and A. debilis. These species ...
Tatman, Nicole - - 2011
During two studies of mortality in fawns of desert mule deer (Odocoileus hemionus eremicus) in Crockett County, Texas, and Gila County, Arizona, we recorded rates of retention and problems with vaginal-implant transmitters (VITs). Our objectives were to determine if rates of retention differed between studies, years, timing of insertions, and ...
Eulinger, Kevin - - 2011
Small mammals were captured at Swan Lake National Wildlife Refuge, Chariton County, Missouri, using Sherman live traps and Museum special kill traps in five habitats. Trapping generated 1,078 captures representing 10 species in 6,400 trap nights. Museum Specials captured significantly more small mammals than Sherman live traps. Both types of ...
Reed, Sarah - - 2011
During 2003-2005, I surveyed 82 sites on the North and South rims of Grand Canyon, Coconino County, Arizona, to test effectiveness of four non-invasive techniques for detecting carnivores and to assess patterns of co-occurrence among pairs of species. Techniques were not equally effective for detecting carnivores. Searches of transects for ...
Kaufman, Glennis - - 2011
We examined whether chronic exposure of traps to disinfectant reduced trappability of rodents as compared to new traps. we tested whether rodents initially chose between treated (disinfected) and new traps and if total number of captures differed between these treatments. Disinfectant did not reduce catchability of traps; rodents actually preferred ...
Martinez, Michael - - 2011
Our objectives were to determine which habitat variables had the greatest influence on densities of the Three Forks springsnail (Pyrgulopsis trivialis) and pond snail (Physa gyrina), and to examine interactions between the two species. we measured density and several habitat variables in Three Forks Springs and Boneyard Bog Springs in ...
Espinal, Mario - - 2011
During 2005 and 2007, we examined status of populations of the American crocodile (Crocodylus acutus) in three rivers at El Cajon Reservoir in central Honduras. Number of crocodiles per kilometer of survey varied by river and time of study. Most observations were of hatchlings and yearlings, butjuveniles, subadults, and adults ...
Chambers, Mary - - 2011
Using mist-netting and observational surveys in southeastern Arizona, we documented use of habitat by 12 species of birds that migrate to this Mexican monsoon region to molt. During the drier monsoon season in 2007, higher proportions of molt-migrants congregated at riparian areas. During the wetter monsoon season in 2008, a ...
Block, William - - 2011
In ponderosa pine-Gambel oak (Pinus ponderosa-Quercus gambelii) forests of north-central Arizona, we examined occupancy and habitats of four species of sciurids (rock squirrel Spermophilus variegatus, golden-mantled ground squirrel S. lateralis, gray-collared chipmunk Tamias cinereicollis, cliff chipmunk T. dorsalis). Numbers of captures were highly variable, suggesting a patchy distribution of species. ...
Villepique, Jeffrey - - 2011
We investigated diet of cougars (Puma concolor) in the eastern Sierra Nevada, California, following a decline in the population of mule deer (Odocoileus hemionus). Mule deer declined 84% from 1985 to 1991, a period concurrent with declines in bighorn sheep (Ovis canadensis sierrae; an endangered taxon). An index to numbers ...
Taylor, Harry - - 2011
Parthenogenetic Aspidoscelis tesselata (pattern class C) reaches the northern limit of its distribution in Ninemile Valley, Otero County, Colorado. Its coexistence with gonochoristic A. sexlineata permitted comparison of diets between species of different sizes, reproductive modes, and evolutionary histories. Based on numbers of prey in stomachs, A. sexlineata had a ...
Milanovich, Joseph - - 2011
We studied a population of Plethodon albagula inhabiting an abandoned mine in Garland County, Arkansas, to test whether variables such as fecundity, diameter of egg, total number of eggs produced, and total number of clutches were influenced by precipitation or prescribed burning. we also compared ratios of juveniles to adults ...
Figueroa-Castro, Dulce - - 2011
We determined that Eupatorium petiolare was either wind pollinated or self-fertilized, that Tagetes lunulata and Verbesina virgata showed autonomous self-fertilization, that Dahlia coccinea seems to be self-incompatible and pollinated by diurnal insects, and that, although overall longevity of capitula of V. virgata was greater in shaded sites, production of fruit ...
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