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Articles 1 - 30 of 56
Full-Text Articles in Physical Sciences and Mathematics
Blackbirds And Corn In Ohio, Richard A. Dolbeer
Blackbirds And Corn In Ohio, Richard A. Dolbeer
USDA Wildlife Services: Staff Publications
Damage to corn by blackbirds (Icteridae) has been an economic problem throughout historical times in North America. Ohio, with the highest nesting season population density of red-winged blackbirds (Agelaius phoeniceus) in North America and large acreages of corn, has been a key State in this conflict. Surveys of damage from 1968 to 1979 revealed that blackbirds annually destroyed less than 1% of the corn crops in Ohio, a 4- to 6-million dollar loss at 1979 prices. This total dollar loss is somewhat misleading because of the uneven distribution of damage among fields. Over 97% of the cornfields in Ohio receive …
Evaluation Of Lasers To Disperse American Crows, Corvus Brachyrhynchos, From Urban Night Roosts, W.P. Gorenzel, B. F. Blackwell, G.D. Simmons, T.P. Salmon, R.A. Dolbeer
Evaluation Of Lasers To Disperse American Crows, Corvus Brachyrhynchos, From Urban Night Roosts, W.P. Gorenzel, B. F. Blackwell, G.D. Simmons, T.P. Salmon, R.A. Dolbeer
USDA Wildlife Services: Staff Publications
American crows (Corvus brachyrhynchos) have a long history of causing agricultural damage in North America. Shooting and bombing at crow night roosts have been employed to reduce such damage. Most roosts were located in rural locations, but in the latter half of the 1900s crows began to roost in urban locations. Urban crow roosts are presently a nationwide problem in the United States. Thousands of crows at a roost create problems for businesses and residents. Improved control techniques are needed. Lasers have been used in Europe to scare and disperse birds but the technique has only recently received formal testing. …
A Socioeconomic And Biological Evaluation Of Current And Hypothetical Crappie Regulations In Sardis Lake, Mississippi: An Integrated Approach, Brian Dorr, Ian A. Munn, Keith O. Meals
A Socioeconomic And Biological Evaluation Of Current And Hypothetical Crappie Regulations In Sardis Lake, Mississippi: An Integrated Approach, Brian Dorr, Ian A. Munn, Keith O. Meals
USDA Wildlife Services: Staff Publications
We conducted a socioeconomic survey and review of existing biological data in an integrated evaluation of current and hypothetical fishery regulations on crappies Pomoxis spp. in Sardis Lake, Mississippi. The objectives of this study were to (1) assess angler acceptance of current and hypothetical harvest restrictions, (2) determine the recreational value of the crappie fishery to its participants, (3) estimate possible changes in recreational value based on angler responses to hypothetical regulations, and (4) integrate the results of the socioeconomic surveys with existing biological information. Using the travel cost method, we estimated mean expenditures at US$29.48 and average consumer surplus …
Field Evaluation Of Flight ControlTm To Reduce Blackbird Damage To Newly Planted Rice, John L. Cummings, Michael L. Avery, Owen Mathre, E. Allen Wilson, Darryl L. York, Richard M. Engeman, Patricia A. Pochop, James E. Davis Jr.
Field Evaluation Of Flight ControlTm To Reduce Blackbird Damage To Newly Planted Rice, John L. Cummings, Michael L. Avery, Owen Mathre, E. Allen Wilson, Darryl L. York, Richard M. Engeman, Patricia A. Pochop, James E. Davis Jr.
USDA Wildlife Services: Staff Publications
An effective, economic, and environmentally safe bird repellent is needed to reduce blackbird (Icterinae) depredations to newly planted rice. We evaluated Flight ControlTM, a 50% anthraquinone product, as a seed treatment for newly planted rice. We treated rice seed with Flight Control at a 2% (g/g) concentration (1% active anthraquinone) the day of planting. This concentration reduced the number of blackbirds (P=0.0003) using treated fields and blackbird damage to rice seed (P=0.0124). The chemical concentration of anthraquinone on rice seed averaged 0.79% (SE=0.06%) at planting; 0.39% (SE= 0.04%) at day I, 0.34% (SE=0.05%) at …
Wildlife Fertility Control, K.A. Fagerstone
Wildlife Fertility Control, K.A. Fagerstone
USDA Wildlife Services: Staff Publications
Huge flights of Canada geese turn off local park visitors with their messy, smelly "business cards." The superabundant white-tailed deer we love to watch also can do a number on your car at night and host the ticks that carry Lyme Disease. Blackbirds and gulls and coyotes and other critters bring their own problems when their numbers get out of hand. Most such problems reach their highest profile in urban/suburban areas where traditional animal-control techniques such as hunting and trapping are frowned upon or illegal. More and more people are calling for wildlife managers to use "fertility control"–-but is that …
Assessment Of Cabergoline As A Reproductive Inhibitor In Coyotes (Canis Latrans), T. J. Deliberto, A. Seglund, W. Jochle, B. Kimball
Assessment Of Cabergoline As A Reproductive Inhibitor In Coyotes (Canis Latrans), T. J. Deliberto, A. Seglund, W. Jochle, B. Kimball
USDA Wildlife Services: Staff Publications
The efficacy of three oral formulations (gelatin capsule, tablet, oil base) and five dosages (50, 100, 250, 500, 1000 μg) of cabergoline to disrupt reproduction in coyotes (Canis latrans) was evaluated. The type of formulation used had no effect on plasma progesterone and prolactin concentrations or on mean litter size. No adverse side effects (for example, vomiting, anorexia, diarrhea) were observed despite the use of doses of up to 20 times the therapeutic dose used for domestic dogs and cats. All coyotes treated with 50, 100, 250 and 500 μg cabergoline whelped, but plasma progesterone concentrations in these coyotes were …
Dietary Overlap Between Wolves And Coyotes In Northwestern Montana, Wendy M. Arjo, Daniel H. Pletscher, Robert R. Ream
Dietary Overlap Between Wolves And Coyotes In Northwestern Montana, Wendy M. Arjo, Daniel H. Pletscher, Robert R. Ream
USDA Wildlife Services: Staff Publications
We studied effects of recolonizing wolves (Canis lupus) in the North Fork of the Flathead area of northwestern Montana on the diets of coyotes (C. latrans) from 1994 to 1997. Wolf and coyote diets differed in frequency of occurrence of prey species during 3 of the 4 summers and winters (P< 0.001) during the study. Coyote diets contained more murid prey items, and wolf diets contained more deer (Odocoileus virginianus and O. hemionus) in the summer and elk (Cervus elaphus) in the winter. Coyotes and wolves ate prey of different size during both the summer (P < 0.001) and winter (P < 0.001) months in 1994– 1996: wolves took a greater proportion (P < 0.001) of large (>45 kg) prey species and coyotes, small (<2 kg) prey (P < 0.001). Wolves selected a larger proportion of adults (P …
Poly(Methyl Methacrylate) Synthetic Grit Formulations Sustain The Delivery Of Nicarbazin, A Contraceptive Agent, In Pest Waterfowl, Jerome C. Hurley, John J. Johnston
Poly(Methyl Methacrylate) Synthetic Grit Formulations Sustain The Delivery Of Nicarbazin, A Contraceptive Agent, In Pest Waterfowl, Jerome C. Hurley, John J. Johnston
USDA Wildlife Services: Staff Publications
Sixty-three mallards were fed one of ten poly(methyl methacrylate) based synthetic grit formulations containing varying concentrations of a proposed wildlife contraceptive (nicarbazin), plasticizer (acetyl tributylcitrate) and/or cross-linking agent (1,4-butanediol diacrylate). Release characteristics of the contraceptive agent were monitored for the purpose of developing a contraceptive formulation for control of pest waterfowl in urban settings. The addition of plasticizer increased the erosion rate (t1/2=0.97-2.85 days), cross-linking the polymer matrix slightly decreased the erosion rate (t1/2=4.45-5.05 days) and increasing the concentration of the contraceptive agent increased the erosion rate (t1/2= 3 . 3 …
Use Of Sensory Cues By Fish Crows Corvus Ossifragus Preying On Artificial Bird Nests, Leonard Santisteban, Kathryn E. Sieving, Michael L. Avery
Use Of Sensory Cues By Fish Crows Corvus Ossifragus Preying On Artificial Bird Nests, Leonard Santisteban, Kathryn E. Sieving, Michael L. Avery
USDA Wildlife Services: Staff Publications
How predators locate avian nests is poorly understood and has been subjected to little experimental inquiry. We examined which sensory stimuli were important in the nest-finding behavior of fish crowsCorvus ossifragus, a common nest predator in the southeastern United States. Using an array of potted trees in a large enclosure, we presented artificial nests to captive crows and quantified responses to visual, auditory, and olfactory nest cues, and nest position. Partial ranks of nest-treatment preferences were analyzed using log-linear models. Nest visibility significantly increased the likelihood of predation by fish crows and increasing nest height was a marginally significant influence …
Beaver Herbivory And Its Effect On Cottonwood Trees: Influence Of Flooding Along Matched Regulated And Unregulated Rivers, Stewart W. Breck, Kenneth R. Wilson, Douglas C. Andersen
Beaver Herbivory And Its Effect On Cottonwood Trees: Influence Of Flooding Along Matched Regulated And Unregulated Rivers, Stewart W. Breck, Kenneth R. Wilson, Douglas C. Andersen
USDA Wildlife Services: Staff Publications
We compared beaver (Castor canadensis) foraging patterns on Fremont cottonwood (Populus deltoides subsp. wislizenii ) saplings and the probability of saplings being cut on a 10 km reach of the flow-regulated Green River and a 8.6 km reach of the free-flowing Yampa River in northwestern Colorado. We measured the abundance and density of cottonwood on each reach and followed the fates of individually marked saplings in three patches of cottonwood on the Yampa River and two patches on the Green River. Two natural floods on the Yampa River and one controlled flood on the Green River between …
Potential Hazards Of Drc- 1339 Treated Rice To Non-Target Birds When Used At Roost Staging Areas In Louisiana To Reduce Local Populations Of Depredating Blackbirds, John L. Cummings, James F. Glahn, E. Allen Wilson, James E. Davis Jr.
Potential Hazards Of Drc- 1339 Treated Rice To Non-Target Birds When Used At Roost Staging Areas In Louisiana To Reduce Local Populations Of Depredating Blackbirds, John L. Cummings, James F. Glahn, E. Allen Wilson, James E. Davis Jr.
USDA Wildlife Services: Staff Publications
Hazards of DRC-1339 treated brown rice to non-target birds were assessed during an operational baiting program near Point Blue, Louisiana, USA. The predominant non-target birds using DRC-1339 bait sites and surrounding habitat were savannah sparrows (Passerculus sandwichensis), mourning doves (Zenaida macroura), killdeers (Charadrius rociferus), and unidentified sparrows (Fringillidae). Systematic searches of DRC-1339 bait sites and adjacent habitat for non-target dead or affected birds produced 1 northern cardinal (Cardinalis cardinalis). There was no mortality of potential non-target species, savannah sparrows, white-crown sparrows (Zonotrichia leucophrys), field sparrows (Spizella pusilla …
Seasonal Marking Efficacy Of Dupont Oil Blue A Dye On Steam-Rolled Oat Groat Baits For Valley Pocket Gophers, Craig A. Ramey, George H. Matschke, Richard M. Engeman
Seasonal Marking Efficacy Of Dupont Oil Blue A Dye On Steam-Rolled Oat Groat Baits For Valley Pocket Gophers, Craig A. Ramey, George H. Matschke, Richard M. Engeman
USDA Wildlife Services: Staff Publications
We examined if Valley pocket gophers (Thomomys bottae) exhibited a seasonal preference for consuming steamed-rolled oat (SRO) groat bait treated with 1.6% Dupont oil blue A (fat-marking dye). Field tests were conducted in California alfalfa fields during winter, summer, and fall, and in walnut orchards during winter and summer. Five treatment units (TUs) were established each with 60 burrows for each season and habitat studied during 1997–1999. SRO groat marker bait (4 g) was placed inside each active burrow. All bait sites were re-opened about 96 h later and examined for the presence (all or some) or absence …
Safe Efficacy Of Three Strychnine Alkaloid Bait Concentrations For Hand-Baiting Control Of Plains Pocket Gophers, Craig A. Ramey, George H. Matschke, Paul L. Hegdal, Geraldine R. Mccann, Richard M. Engeman
Safe Efficacy Of Three Strychnine Alkaloid Bait Concentrations For Hand-Baiting Control Of Plains Pocket Gophers, Craig A. Ramey, George H. Matschke, Paul L. Hegdal, Geraldine R. Mccann, Richard M. Engeman
USDA Wildlife Services: Staff Publications
In November 1990, field efficacy studies using milo baits formulated with 0.35%, 0.75%, or 1.30% strychnine alkaloid were compared to a placebo (0.0% strychnine) for controlling plains pocket gophers (Geomys bursarius) near Pleasanton, Texas. These data were required by the US Environmental Protection Agency (EPA) as partial fulfillment for the maintenance of the rodenticide registrations of the US Department of Agriculture. Each of four treatment units (TUs) within a block (2) was randomly assigned one of the four baits. Within each TU, 15 gophers were captured (balanced roughly for gender) and instrumented with radio transmitters. Following a pretreatment …
Thamnophis Radix (Plains Garter Snake) Brood Size, Richard M. Engeman, Isabel M. Engeman, Alexander N. Engeman
Thamnophis Radix (Plains Garter Snake) Brood Size, Richard M. Engeman, Isabel M. Engeman, Alexander N. Engeman
USDA Wildlife Services: Staff Publications
Brood sizes for Thamnophis radix show much geographical variation (Fitch 1985. Misc. Publ. Univ. Kansas Mus. Nat. Hist. 76:l- 76). While brood sizes can range up to 60 (Fitch, up. cit.; Collins 1993. Amphibians and Reptiles in Kansas. Univ. Kansas Mus. Nat. Hist., Lawerence, Kansas, 397 pp.), the brood sizes reported for Colorado have fallen far short of this. Hammerson (1999. Amphibians and Reptiles in Colorado, Second Edition. University Press of Colorado, Niwot, Colorado, 480 pp.) observed brood sizes in Colorado of 16-21 (N = 9), with a mean of 16. Rossman et al. (1996. The Garter Snakes: Evolution and …
Evaluation Of Flight Control® To Reduce Blackbird Damage To Newly Planted Rice In Louisiana, John L. Cummings, Patricia A. Pochop, Richard M. Engeman, James E. Davis Jr., Thomas M. Primus
Evaluation Of Flight Control® To Reduce Blackbird Damage To Newly Planted Rice In Louisiana, John L. Cummings, Patricia A. Pochop, Richard M. Engeman, James E. Davis Jr., Thomas M. Primus
USDA Wildlife Services: Staff Publications
Blackbirds cause extensive damage to newly planted and ripening rice. To date there is not a registered bird repellent for reducing this damage. We evaluated Flight Control®, a 50% anthraquinone product, as a potential repellent to blackbirds in cage and field tests in Louisiana. In one- and no-choice cage tests, brown-headed cowbird and red-winged blackbird consumption of 2%) Flight control® treated rice seed was significantly reduced. In a subsequent field test. 2% Flight control® was effective in reducing blackbird damage (P = 0.001 ) to newly planted rice seed. Chemical residues at 7 days post-planting averaged 0.66% anthraquinone. Further …
Wildlife Damage Management Research Needs: Perceptions Of Scientists, Wildlife Managers, And Stakeholders Of The Usda/Wildlife Services Program, Richard L. Bruggers, Richard Owens, Thomas Hoffman
Wildlife Damage Management Research Needs: Perceptions Of Scientists, Wildlife Managers, And Stakeholders Of The Usda/Wildlife Services Program, Richard L. Bruggers, Richard Owens, Thomas Hoffman
USDA Wildlife Services: Staff Publications
This paper presents the results of a nationwide research needs assessment of the important wildlife-human conflict issues and associated research needs of the USDA:APHIS-Wildlife Services (WS) program and its stakeholders. Thirty-six WS State Directors, 23 WS/National Wildlife Research Center (NWRC) scientists and 6 members of the National Wildlife Services Advisory Committee (NWSAC) to the US Secretary of Agriculture responded to a request for participation. This paper compares these current research needs with previous regional and national research needs assessments for wildlife damage management in the United States. Important national problems identified included issues related to aviation, timber, agriculture, aquaculture, and …
Sustained Evaluation Of The Effectiveness Of Detector Dogs For Locating Brown Tree Snakes In Cargo Outbound From Guam, Richard M. Engeman, Daniel S. Vice, Darryl York, Kenneth S. Gruver
Sustained Evaluation Of The Effectiveness Of Detector Dogs For Locating Brown Tree Snakes In Cargo Outbound From Guam, Richard M. Engeman, Daniel S. Vice, Darryl York, Kenneth S. Gruver
USDA Wildlife Services: Staff Publications
The accidental introduction of the brown tree snake (Boiga irregularis) to Guam has resulted in the extirpation of most of the island's native terrestrial vertebrates, has created a health hazard to infants and children, and has resulted in economic losses. The high brown tree snake population densities on Guam, the species' adaptations for successful dispersal, and Guam's position as a focal point for commercial and military cargo shipments have created a high level of concern that brown tree snakes could spread from Guam to colonize other vulnerable locations. Cargo inspections using teams of handlers and their detector dogs …
Estimating Deer Damage Losses In Cabbage, Richard M. Engeman, Brian K. Maedke, Scott F. Beckerman
Estimating Deer Damage Losses In Cabbage, Richard M. Engeman, Brian K. Maedke, Scott F. Beckerman
USDA Wildlife Services: Staff Publications
A standardized procedure for estimating deer damage in cabbage is used to settle claims for compensation of losses in the state of Wisconsin. By completely enumerating all damaged heads of cabbage in a field. We validated the standard procedure for accuracy. The general paradigm used for assessing losses requires a subjective examination of the field to define strata with and without damage, obtaining representative samples of undamaged heads in each strata with 3 quadrants. then converting the difference in density of undamaged heads between strata into an estimate of damage for the entire field. Weighing a sample of undamaged heads …
Caffeine As A Repellent For Slugs And Snails, Robert G. Hollingsworth, John W. Armstrong, Earl Campbell
Caffeine As A Repellent For Slugs And Snails, Robert G. Hollingsworth, John W. Armstrong, Earl Campbell
USDA Wildlife Services: Staff Publications
Most commercial products for snail and slug control contain either metaldehyde or methiocarb as the active ingredient, the residues of which are not permitted in food crops in the United States. We have discovered that solutions of caffeine are effective in killing or repelling slugs and snails when applied to foliage or the growing medium of plants. Because caffeine is a natural product and is classified by the US Food and Drug Administration as a GRAS (‘generally recognized as safe’) compound, it has potential as an environmentally acceptable alternative toxicant for the control of slugs and snails on food crops. …
A Comparison Of Four Rodent Control Methods In Philippine Experimental Rice Fields, Md. Sayed Ahmed, Lynwood A. Fiedler
A Comparison Of Four Rodent Control Methods In Philippine Experimental Rice Fields, Md. Sayed Ahmed, Lynwood A. Fiedler
USDA Wildlife Services: Staff Publications
Four rodent control techniques-sustained baiting (SB) with coumachlor. pulsed baiting (PB) with brodifacoum. a lethal electrified barrier (LEB), and a nonlethal electrified barrier (NLEB)-were evaluated on the experimental farm of the International Rice Research Institute (IRRI) in the Philippines. A fifth treatment (no experimental rodent control) was established for reference. Mean tiller damage and rodent activity, respectively. near harvest were 1.00%1 and 1.5% in the LEB plots, 1.6% and 18.0% in the SB plots, 2.1% and 16.0 % in the PB plots, and 4.1% and 32.5% in the NLEB plots. Highest mean tiller damage (9.3%) and rodent activity (56.0%) occurred …
Methyl Anthranilate Aerosol For Dispersing Birds From The Flight Lines At Homestead Air Reserve Station, Richard M. Engeman, Jeffrey Peterla, Bernice Constantin
Methyl Anthranilate Aerosol For Dispersing Birds From The Flight Lines At Homestead Air Reserve Station, Richard M. Engeman, Jeffrey Peterla, Bernice Constantin
USDA Wildlife Services: Staff Publications
The failure of traditional hazing methods to provide a lasting dispersal of birds from the flight lines at Homestead Air Reserve Station, Florida led to trials with Rejex-it® TP-40 methyl anthranilate (MA) formulation as an aerosol. A variety of civil, military and other government aircraft use the base, including combat aircraft which are particularly prone to bird air strikes due to low altitude, high speed flights. Migrating swallows and killdeer congregate at the airfield to forage on insects, and the large numbers of birds cause restrictions in airfield operations because of potential strike hazards with aircraft. MA applied by fogger …
Aerosolized Essential Oils And Individual Natural Product Compounds As Brown Treesnake Repellents , Larry Clark, John Shivik
Aerosolized Essential Oils And Individual Natural Product Compounds As Brown Treesnake Repellents , Larry Clark, John Shivik
USDA Wildlife Services: Staff Publications
Chemical irritants useful as repellents for brown treesnakes (Boiga irregularis) were identified. Exposure to various compounds produced a range of intensities for locomotory behavior in snakes. Essential oils comprised of 10 g liter -1 solutions of cedarwood, cinnamon, sage, juniper berry, lavender and rosemary each were potent snake irritants. Brown treesnakes exposed to a 2-s burst of aerosol of these oils exhibited prolonged, violent undirected locomotory behavior. In contrast, exposure to a 10 g liter-1 concentration of ginger oil aerosol caused snakes to locomote, but in a deliberate, directed manner. We also tested specific compounds, all derivative …
Ornithological Literature, Robert C. Beason
Ornithological Literature, Robert C. Beason
USDA Wildlife Services: Staff Publications
BIRDS OF THE SOUTHWEST. By John H. Rappole.
Reproduction In Captive Wild-Caught Coyotes (Canis Latrans), Jeffrey S. Green, Frederick F. Knowlton, William C. Pitt
Reproduction In Captive Wild-Caught Coyotes (Canis Latrans), Jeffrey S. Green, Frederick F. Knowlton, William C. Pitt
USDA Wildlife Services: Staff Publications
We assessed reproductive patterns of coyotes (Canis latrans) from a 12-year data set involving 24 pairs of captive animals acquired from Latah County, Idaho. None of the females had placental scars (fetal implantation sites) at 1 year of age, but over 80% had placental scars by 2 years of age. The fraction with placental scars remained at 80–90% through age 9 years and then declined to ,40% by age 12 years. Similarly, mean number of placental scars per female rose rapidly through 2–3 years of age, remained stable until age 8 years, and then progressively declined to a …
Uncertainty Of Exploitation Estimates Made From Tag Returns, L.E. Miranda, R.E. Brock, B.S. Dorr
Uncertainty Of Exploitation Estimates Made From Tag Returns, L.E. Miranda, R.E. Brock, B.S. Dorr
USDA Wildlife Services: Staff Publications
Over 6,000 crappies Pomoxis spp. were tagged in five water bodies to estimate exploitation rates by anglers. Exploitation rates were computed as the percentage of tags returned after adjustment for three sources of uncertainty: post-release mortality due to the tagging process, tag loss, and the reporting rate of tagged fish. Confidence intervals around exploitation rates were estimated by re-sampling from the probability distributions of tagging mortality, tag loss, and reporting rate. Estimates of exploitation rates ranged from 17% to 54% among the five study systems. Uncertainty around estimates of tagging mortality, tag loss, and reporting resulted in 90% confidence intervals …
High-Performance Liquid Chromatography-Based Determination Of Nicarbazin Excretion In Waterfowl, Randal S. Stahl, John J. Johnston
High-Performance Liquid Chromatography-Based Determination Of Nicarbazin Excretion In Waterfowl, Randal S. Stahl, John J. Johnston
USDA Wildlife Services: Staff Publications
A method for the high-performance liquid chromatography (HPLC) determination of nicarbazin uptake and excretion in ducks is presented. The method uses few clean-up steps and provides a rapid assessment of nicarbazin excretion by measuring the analyte 4,4’-dinitrocarbanalide (DNC). During method development the effect of extraction volume, number of extractions, mobile phase composition, column temperature, and injection volume were varied to optimize sensitivity and achieve as short a run time as possible. For our purposes, a 2 x 5.0 ml 1:1 dimethyl formamide (DMF):acetonitrile (ACN) extraction injected (40 ml) into an HPLC system equipped with a Keystone octadecylsilyl (ODS) C column …
Effect Of Roost Harassment On Cormorant Movements And Roosting In The Delta Region Of Mississippi, Mark E. Tobin, D. Tommy King, Brian S. Dorr, Scott J. Werner, David S. Reinhold
Effect Of Roost Harassment On Cormorant Movements And Roosting In The Delta Region Of Mississippi, Mark E. Tobin, D. Tommy King, Brian S. Dorr, Scott J. Werner, David S. Reinhold
USDA Wildlife Services: Staff Publications
Double-crested Cormorant (Phalacrocorax auritus) predation on Channel Catfish (Ictalurus punctatus) at commercial farms has been estimated to cost the Mississippi aquaculture industry approximately $5 million annually to replace consumed fingerlings. In 1997, catfish producers assumed responsibility for the dispersal of cormorants in night roosts in the eastern (interior) delta region of Mississippi, where catfish farms are concentrated. We documented movements of 50 cormorants marked with radio transmitters in the delta region from January through March 1997. We obtained 161 post-capture day locations and 176 post-capture night roost locations. Cormorants that were harassed at their night roost …
Ornithological Literature, Robert C. Beason
Ornithological Literature, Robert C. Beason
USDA Wildlife Services: Staff Publications
BEHAVIORAL ECOLOGY OF TROPICAL BIRDS. By B. J. M. Stutchbury and E. S. Morton.
Distribution, Abundance And Habitat Use Of American White Pelicans In The Delta Region Of Mississippi And Along The Western Gulf Of Mexico Coast, D. Tommy King, Thomas C. Michot
Distribution, Abundance And Habitat Use Of American White Pelicans In The Delta Region Of Mississippi And Along The Western Gulf Of Mexico Coast, D. Tommy King, Thomas C. Michot
USDA Wildlife Services: Staff Publications
Aerial surveys of American White Pelicans (Pelecanus erythrorhynchos) were conducted over coastal Louisiana and the delta region of Mississippi on 1-2 days during December, February, and April each year from 1997 to 1999. Additional surveys were conducted in coastal Texas and Mexico during January 1998 and 1999. The numbers, location, and habitat of all pelicans observed were recorded. The coastal zone of Louisiana consistently had higher numbers of pelicans (18,000 to 35,000 birds) than other areas surveyed (3,000 to 8,000 birds), indicating that Louisiana may be the most important wintering area for American White Pelicans east of the …
Ornithological Literature , Robert C. Beason
Ornithological Literature , Robert C. Beason
USDA Wildlife Services: Staff Publications
Review of BIRDS OF THE TEXAS PANHANDLE. By Kenneth D. Seyffert.