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Results 701 - 750 of 1305
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Degremont, Lionel - - 2010
This study reports mortality under laboratory conditions in unselected controls and 2 lines of juvenile Pacific oysters Crassostrea gigas previously selected for their high or low survival in the field during the summer period. Oysters were also deployed in field conditions, and mortality between both conditions was then compared. In ...
Cardona-Costa, Jose - - 2010
In this work we describe a simple methodology to assess the availability of quality gametes throughout the year to perform technological assays. This methodology was applied to the evaluation of the reproductive seasonality of Crassostrea gigas from October 2007 to November 2008 in the western Mediterranean coast (Burriana, Spain). Gonad ...
Kilada, Raouf - - 2010
This study investigates for the first time the reproduction biology of Uroteuthis duvauceli in the northern Red Sea, Egypt, over 4 seasons. The sexual maturity was analyzed using the gonad condition in both sexes and by the color of the accessory nidamental glands in females. Spawning season was determined by ...
Sanchez-Gonzales, Sergio - - 2010
We collected 12 mountain clingfish Gobiesox fluviatilis in the Rio Tamazula that represent the first record of the species in both the Rio Culiacan basin and the state of Sinaloa, Mexico. We compared proportions of body and counts of fin rays of the new specimens with those previously reported for ...
Azevedo, Fernando - - 2010
This is the first report of cannibalism in a free-ranging population of jaguars (Panthera onca). An encounter among unfamiliar jaguars may have provoked social stress, a behavior reported in other free-ranging carnivores.
Martin, Joel - - 2010
We describe a method for making clay mimics of bird eggs. These eggs can be used in experiments that require many uniform, accurate artificial eggs. We developed methods and made about 1,000 clay eggs at a cost of $0.55 each.
McAllister, Chris - - 2010
Ten new county records and significant extensions of known geographic ranges are reported for 10 taxa of fishes within 6 families (Atherinopsidae, Catostomidae, Centrarchidae, Cyprinidae, Fundulidae, and Percidae) from five rivers in Arkansas. Records are presented for the shoal chub (Macrhybopsis hyostoma), highfin carpsucker (Carpiodes velifer), golden redhorse (Moxostoma erythrurum), ...
Giron, Luis - - 2010
We report the first record of Van Gelder's bat (Bauerus dubiaquercus) from El Salvador, Central America. This is the first report of Van Gelder's bat from the Pacific versant of Mesoamerica, between Guerrero, Mexico, and Costa Rica, a distance of ca. 1,850 km.
Welsh, Hartwell H., - - 2010
Ecological boundaries have been of interest to naturalists since the time of Darwin and Wallace because they are transitional zones on the landscape across which distinct changes occur in constitution of plant and animal communities. In the xeric landscapes of the central Baja California Peninsula, fan palm (Erythea armata and ...
Carson, Evan - - 2010
Cyprinids belonging to the genus Dionda have a relatively broad distribution in southwestern North America. However, validity of populations in several of the nominal species has not been examined rigorously. During the course of a conservation-genetics study of Dionda in western Texas we determined that one population presumed to represent ...
McAndrews, Amy - - 2010
We present new information on 26 species of birds encountered in the Plains of Tehuantepec, Oaxaca, Mexico, including four species new to the state: snow goose (Chen caerulescens), prairie falcon (Falco mexicanus), red-throated pipit (Anthus cervinus), and bobolink (Dolichonyx orizyvorus). Improving knowledge of status and distribution of species in this ...
McBride, Rocky - - 2010
The ocelot, Leopardus pardalis, is a medium-sized Neotropical felid with a relatively wide geographical distribution. Across their range, ocelots exhibit clinal variation in pattern and color of pelage. Despite this variation, few aberrant genetic morphs have been documented. This record describes the first apparent leucistic variant for the ocelot: a ...
Campbell, Tyler - - 2010
Wild boars (Sus scrofa) are increasing in abundance and geographic distribution throughout North America. Our objectives were to determine daily and hourly activity patterns. We placed global-positioning-system collars on 25 wild boars from two sites in southern Texas. Wild boars at both sites displayed highly nocturnal activity patterns, and during ...
Jass, Christopher - - 2010
We report two fossil specimens of the desert tortoise (Gopherus agassizii) from Cathedral Cave, White Pine County, Nevada. These specimens are diagnosed as G. agassizii based on morphology of the scute sulcus on the entoplastron and anterior constriction and morphology of the scute sulcus of the epiplastron. The fossils have ...
Caires, Andrea - - 2010
Effects of in-stream hiking on benthic standing stocks and drifting aquatic invertebrates and on organic matter were examined in the North Fork of the Virgin River, Zion National Park, Washington County, Utah. Densities of drifting aquatic invertebrates and organic matter increased with increasing numbers of hikers and reached a threshold ...
Fries, J.N. - - 2010
For captive-bred Devils River minnows (Dionda diaboli), which are federally listed as threatened, we measured critical thermal maxima when they were acclimated at 18, 22, 24, and 27[degrees]C. Critical thermal maxima were 32.6, 34.3, 35.3, and 37.8[degrees]C and were positively correlated with temperatures of acclimation, but not with either gender ...
Hinton, Juliana - - 2010
During 2002-2003, we collected samples of leaf litter (10-cm diameter) from two woodland sites in southwestern Louisiana and one in central Florida. In Louisiana, we collected at four times (autumn, winter, spring, and summer) and in Florida in spring and summer. We divided each sample into two layers, an upper ...
Anderson, Kirk - - 2010
The harvester ants Pogonomyrmex barbatus and P. rugosus serve as hosts for the parasitic ants P. anergismus and P. colei. Recent molecular studies demonstrated that morphology is unreliable for identification of hosts because the hosts contain cryptic species. Using mitochondrial-DNA sequences, we determined identity of 15 of 16 known populations ...
Suarez-Morales, Eduardo - - 2010
The zooplankton fauna of freshwater systems of the Chihuahuan Desert was surveyed 2005-2008. Samples were obtained from habitats including natural lakes, ephemeral waters, springs, and reservoirs. Copepods were sorted and identified to species. Including previous surveys, a total of 38 species occur in the Chihuahuan Desert, the checklist includes 6 ...
Perry, Travis - - 2010
Reliable estimates of size of populations are critical for successful management of translocated desert bighorn sheep (Ovis canadensis mexicana). As costs decrease and quality improves, remote cameras are increasingly used as a non-invasive tool to monitor populations of wildlife, but their efficacy has yet to be evaluated in a diversity ...
Robinson, Sarah - - 2010
Studies quantifying the grouping and forage-selection patterns of scimitar-horned oryx (Oryx dammah) in Texas or in their native range, where they are probably extinct, are scarce. This oryx is less dimorphic in size than most ruminants; dimorphism in size is associated with intersexual differences in grouping patterns and diet. We ...
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