Time filter

Source Type

Baton Rouge, LA, United States

Reid C.,000 Quail Drive | Lewis M.J.,Louisiana State University in Shreveport
Journal of the Botanical Research Institute of Texas | Year: 2014

A plant collecting excursion by boat on a ca. 50 km stretch of the Red River straddling the Arkansas-Louisiana state line yielded several interesting botanical discoveries. The second record of Loeflingia squarrosa from Arkansas was documented. Collections of Dalea lanata and Heliotropium convolvulaceum were made from both states. These collections extend the ranges of these taxa several hundred river-km downstream on the Red River. Our collections of D. lanata and H. convolvulaceum in Louisiana represent the first records of these species for that state. Source

Laborde L.P.,Louisiana State University | Rohwer F.C.,Delta Waterfowl Foundation | Kaller M.D.,Louisiana State University | Reynolds L.A.,000 Quail Drive
Wildlife Society Bulletin | Year: 2014

We surveyed random and convenience samples of Louisiana, USA, waterfowl hunters after the 2009-2010 season, and asked identical questions about waterfowl-hunting effort, success, satisfaction, regulatory alternatives, and demographics. We received 727 usable responses to our random mail survey, and 949 usable responses to an on-line web survey that was accessible to the general public. Compared with the random mail survey, respondents to the web survey hunted more frequently, harvested more waterfowl, and placed greater importance on waterfowl hunting. However, we noted similarities in attitudes toward regulatory alternatives across survey methods. Binary logistic regression of 13 variables measuring effort, success, satisfaction, and demographics accurately predicted the survey method of 75.5% of respondents. Similar analysis of 10 variables measuring attitudes toward regulatory alternatives categorized only 63.1% of the respondents into their correct survey mode, and failed to meet conservative standards for predictive accuracy. Polar reclassification of attitudinal responses into bichotomous categories led to identical managerial conclusions, irrespective of survey method. Based on our results, we believe responses from the random mail survey more accurately represent the demographics, effort, and success of Louisiana waterfowl hunters; however, the attitudes of respondents did not differ between random mail and convenience web samples, especially in regard to regulatory alternatives. The ease and low cost of web surveys are important advantages over traditional mail surveys. We suggest survey methodology be carefully linked to survey objectives, and that open web surveys may be used to supplement random surveys in investigations of stakeholder attitudes to inform development of natural resource policy. © 2014 The Wildlife Society. Source

Walter S.T.,University of Louisiana at Lafayette | Walter S.T.,Tulane University | Carloss M.R.,000 Quail Drive | Carloss M.R.,Ducks Unlimited Inc. | And 2 more authors.
Journal of Field Ornithology | Year: 2014

Marine oil spills may have extensive and deleterious effects on coastal waterbirds, but pre-spill data sets are often not available for making comparisons of demographics to the period following a spill. The 2010 Deepwater Horizon oil spill allowed us to compare Brown Pelican (Pelecanus occidentalis) demographics during pre- and post-spill years. We banded 1114 pelicans on Louisiana barrier islands from 2007 to 2009, tracked their distribution via band re-sighting surveys from 2008 to 2011, and conducted age-structure surveys. Across Louisiana coastal islands in 2011, we detected 7% of pelicans that had been oiled during the 2010 spill and released following rehabilitation. Similarly, 6% of pelicans (not oiled) banded at the same release site in 2007 were observed across coastal islands 1 yr after banding. We observed variation in proportions of pelicans that were 1, 2, and 3 or more years old among years (2008-2011) and across islands, but little variation could readily be assigned to spill-related mortality. These Brown Pelican demographic trends one year following the Deepwater Horizon oil spill are contrary to other assessments of the impacts of oil contamination on marine birds. However, additional research is required to evaluate potential long-term population trends. © 2014 Association of Field Ornithologists. Source

Hoffmayer E.R.,University of Southern Mississippi | Hoffmayer E.R.,National Oceanic and Atmospheric Administration | Franks J.S.,University of Southern Mississippi | Driggers III W.B.,National Oceanic and Atmospheric Administration | And 3 more authors.
Marine Biology | Year: 2014

The dusky shark (Carcharhinus obscurus) is the largest member of the genus Carcharhinus and inhabits coastal and pelagic ecosystems circumglobally in temperate, subtropical and tropical marine waters. In the western North Atlantic Ocean (WNA), dusky sharks are overfished and considered vulnerable by the International Union for the Conservation of Nature. As a result, retention of dusky sharks in commercial and recreational fisheries off the east coast of the United States (US) and in the northern Gulf of Mexico is prohibited. Despite the concerns regarding the status of dusky sharks in the WNA, little is known about their habitat utilization. During the summers of 2008-2009, pop-up satellite archival tags were attached to ten dusky sharks (one male, nine females) at a location where they have been observed to aggregate in the north central Gulf of Mexico southwest of the Mississippi River Delta to examine their movement patterns and habitat utilization. All tags successfully transmitted data with deployment durations ranging from 6 to 124 days. Tag data revealed shark movements in excess of 200 km from initial tagging locations, with sharks primarily utilizing offshore waters associated with the continental shelf edge from Desoto Canyon to the Texas/Mexican border. While most sharks remained in US waters, one individual moved from the northern Gulf of Mexico into the Bay of Campeche off the coast of Mexico. Sharks spent 87 % of their time between 20 and 125 m and 83 % of their time in waters between 23 and 30 °C. Since dusky sharks are among the most vulnerable shark species to fishing mortality, there is a recovery plan in place for US waters; however, since they have been shown to make long-distance migrations, a multi-national management plan within the WNA may be needed to ensure the successful recovery of this population. © 2014 Springer-Verlag Berlin Heidelberg (outside the USA). Source

LaDouceur E.E.B.,Tufts University | Ernst J.,000 Quail Drive | Keel M.K.,University of Georgia
Journal of Wildlife Diseases | Year: 2012

Multiple, nodular, pigmented masses protruding from the cornea and adjacent sclera of the left eye of a white-tailed deer (Odocoileus virginianus) were diagnosed as choristomas (dermoids). Microscopically, the masses contained well-differentiated skin, cartilage, and bone. This appears to be the first report of a corneoscleral choristoma in a cervid. © Wildlife Disease Association 2012. Source

Discover hidden collaborations