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Articles 1 - 30 of 152
Full-Text Articles in Life Sciences
Correlation Between Boldness And Body Mass In Natural Populations Of The Poeciliid Brachyrhaphis Episcopi, C. Brown, F. Jones, V. Braithwaite
Correlation Between Boldness And Body Mass In Natural Populations Of The Poeciliid Brachyrhaphis Episcopi, C. Brown, F. Jones, V. Braithwaite
Sentience Collection
The boldness of individual Brachyrhaphis episcopi, collected from regions of high and low predation, was investigated using two independent assays: (1) the time to emerge from cover and (2) the propensity to leave shoal mates and investigate a novel object. A strong correlation between the two assays was revealed such that fish that emerged from shelter sooner were also more likely to approach a novel object. This is indicative of a boldness personality axis acting across both behavioural contexts. Fish from high-predation areas were bolder than those from low-predation areas and males were bolder than females. A significant correlation between …
Lpe Center News, December 2007
Lpe Center News, December 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue:
• Dry Manure Housing Systems for Beef and Dairy Featured in the January, 2008 Webcast
•. Survey to Determine Air Quality Webcast Topics
• Report Outlines Policy Changes to Clean Up the Chesapeake Bay
•.Virginia Project Offers Incentives for Improved Feed Management on Dairy Farms
Heritable And Experiential Effects On Boldness In A Tropical Poeciliid, Culum Brown, Fiona Burgess, Victoria Braithwaite
Heritable And Experiential Effects On Boldness In A Tropical Poeciliid, Culum Brown, Fiona Burgess, Victoria Braithwaite
Sentience Collection
Consistent differences in human behaviour are often explained with reference to personality traits. Recent evidence suggests that similar traits are widespread across the entire animal kingdom and that they may have substantial fitness consequences. One of the major components of personality is the shyness–boldness continuum. Little is known about the relative contributions of genes and the environment in the development of boldness in wild animal populations. Here, we bred wild-caught fish (Brachyraphis episcopi) collected from regions of highand low-predation pressure, reared their offspring in the laboratory under varying conditions and tested boldness utilising an open-field paradigm. First-generation laboratory-reared fish showed …
Lpe Center News, November 2007
Lpe Center News, November 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue:
• December Webcast Showcases Innovative Manure Treatment Technologies from SBIR Program
•.New and Improved LPELC Website Set for a March, 2008 Launch
• EPA AgSTAR Program Encourages Use of Anaerobic Digesters
• National Air Mitigation Conference Call for Papers Closes December 1
Inside Unlv, Cate Weeks, Diane Russell, David Ashley, Grace Russell
Inside Unlv, Cate Weeks, Diane Russell, David Ashley, Grace Russell
Inside UNLV
No abstract provided.
Lpe Center News, October 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue:
• November Webcast to Examine Vegetative Treatment Systems for Managing Open Lot or Barnyard Runoff
• New Webcast Technology to Debut in October
• Mid-Atlantic Water Quality Program Website Offers Nutrient Budgets
• Pennsylvania Project Examines Manure Management in No-Till Systems
Depauperate Small Mammal Communities In Managed Pine Plantations In Eastern Virginia, James D. Dolan, Robert K. Rose
Depauperate Small Mammal Communities In Managed Pine Plantations In Eastern Virginia, James D. Dolan, Robert K. Rose
Virginia Journal of Science
Loblolly pine (Pinus taeda L.) plantations of four different ages were examined to identify changes in the small mammal community in relation to changes in the vegetational community. Small mammals were evaluated during five seasons using two methods of trapping. Live traps accounted for 65% of captures and seven of nine species, whereas pitfall traps yielded eight species, of which two were not taken with live traps. For both trap types, catch rates averaged less than two per 100 trap-nights, very low even for pine forests. Both abundance and biomass of small mammals declined with increasing stand age, whereas species …
Animal Mind: Science, Philosophy, And Ethics, Bernard E. Rollin
Animal Mind: Science, Philosophy, And Ethics, Bernard E. Rollin
Sentience Collection
Although 20th-century empiricists were agnostic about animal mind and consciousness, this was not the case for their historical ancestors – John Locke, David Hume, Jeremy Bentham, John Stuart Mill, and, of course, Charles Darwin and George John Romanes. Given the dominance of the Darwinian paradigm of evolutionary continuity, one would not expect belief in animal mind to disappear. That it did demonstrates that standard accounts of how scientific hypotheses are overturned – i.e., by empirical disconfirmation or by exposure of logical flaws – is inadequate. In fact, it can be demonstrated that belief in animal mind disappeared as a result …
Animal Minds, Cognitive Ethology, And Ethics, Colin Allen, Marc Bekoff
Animal Minds, Cognitive Ethology, And Ethics, Colin Allen, Marc Bekoff
Sentience Collection
Our goal in this paper is to provide enough of an account of the origins of cognitive ethology and the controversy surrounding it to help ethicists to gauge for themselves how to balance skepticism and credulity about animal minds when communicating with scientists. We believe that ethicists’ arguments would benefit from better understanding of the historical roots of ongoing controversies. It is not appropriate to treat some widely reported results in animal cognition as if their interpretations are a matter of scientific consensus. It is especially important to understand why loose references to ‘‘cognitive ethology’’ by philosophers can signal ignorance …
Lpe Center News, September 2007
Lpe Center News, September 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue:
• Matching Treatment Systems with the Environmental Concern is October’s Webcast Topic
• Help Us Find the “Best of the Best”
• Have You Missed Out on Past Webcasts Because of Technical Difficulties?
• LPE Learning Center Opens Doors for Air Quality Education
• New Webcast Schedule Includes a Wide Variety of Topics
Nociception In Fish: Stimulus–Response Properties Of Receptors On The Head Of Trout Oncorhynchus Mykiss, Paul J. Ashley, Lynne U. Sneddon, Catherine R. Mccrohan
Nociception In Fish: Stimulus–Response Properties Of Receptors On The Head Of Trout Oncorhynchus Mykiss, Paul J. Ashley, Lynne U. Sneddon, Catherine R. Mccrohan
Veterinary Science and Medicine Collection
This study examined stimulus–response properties of somatosensory receptors on the head of rainbow trout, Oncorhynchus mykiss, using extracellular recording from single cells in the trigeminal ganglion. Of 121 receptors recorded from 39 fish, 17 were polymodal nociceptors, 22 were mechanothermal nociceptors, 18 were mechanochemical receptors, 33 were fast adapting mechanical receptors and 31 were slowly adapting mechanical receptors. Mechanical thresholds were higher in polymodal nociceptors than in either slowly adapting or fast adapting mechanical receptors, whereas thermal thresholds of mechanothermal nociceptors were higher than those of polymodal nociceptors. Polymodal nociceptors and mechanochemical receptors gave similar responses to topical applications of …
An Experimental Release Of Elk Into Great Smoky Mountains National Park, Jennifer Lynn Murrow
An Experimental Release Of Elk Into Great Smoky Mountains National Park, Jennifer Lynn Murrow
Doctoral Dissertations
I conducted 6 years of field work to evaluate the habitat use and population dynamics of an experimental release of elk (Cervus elaphus) into Great Smoky Mountains National Park (Park). Elk exhibited relatively small home ranges (female: 10.4 km2 and males: 22.4 km2) and movement distances decreased over time. I calculated survival rates (x = 0.73–0.93) and litter production rates (x = 0.73) for the population. To assess the potential for a long-term elk population, I incorporated those vital rates into the population modeling software Riskman and tested its sensitivity to any given …
Lpe Center News, August 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue:
• Webcast Series Resumes with the Value of Manure in Energy Production
• Webcast Schedule Coming Soon
• Web Soil Survey 2.0 Is a Comprehensive and Useful Resource
• EPA Funded Research to Examine Hormones in Manure
The Influence Of Early Experience On, And Inheritance Of, Cerebral Lateralization, Culum Brown, Jac Western, Victoria A. Braithwaite
The Influence Of Early Experience On, And Inheritance Of, Cerebral Lateralization, Culum Brown, Jac Western, Victoria A. Braithwaite
Veterinary Science and Medicine Collection
Cerebral lateralization refers to the lateralized partitioning of cognitive function in either hemisphere of the brain. Using a standard detour test, we investigated lateralized behaviour in wild-caught, female poeciliid fish, Brachyraphis (=Brachyrhaphis) episcopi, from high- and low-predation areas. Wild fish were bred and their offspring reared under controlled laboratory conditions. These laboratory-reared fish were screened in the same laterality assays as their parents. We observed differences between wild-caught females and their laboratory-reared female offspring in the pattern of lateralization (tendency to use one hemisphere over the other to process information). Conversely, the strength of lateralization (consistency of hemispherical bias) was …
Lpe Center News, July 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue:
• Webcast Planning Survey Complete- Top Picks Are
• LPE Learning Center to be Part of eXtension
• Feed Management Fact Sheets Now Available
• EPA Develops a Matrix of Agriculture Related Regulations
• Upcoming EPA Workshop to Focus on Hormones; ASABE Hosts Symposium on Air Quality and Waste Management
Inhibition Of Nitric Oxide And Soluble Guanylyl Cyclase Signaling Affects Olfactory Neuron Activity In The Moth, Manduca Sexta, Caroline H. Wilson, Thomas A. Christensen, Alan J. Nighorn
Inhibition Of Nitric Oxide And Soluble Guanylyl Cyclase Signaling Affects Olfactory Neuron Activity In The Moth, Manduca Sexta, Caroline H. Wilson, Thomas A. Christensen, Alan J. Nighorn
Health Sciences and Kinesiology Faculty Articles
Nitric oxide is emerging as an important modulator of many physiological processes including olfaction, yet the function of this gas in the processing of olfactory information remains poorly understood. In the antennal lobe of the moth, Manduca sexta, nitric oxide is produced in response to odor stimulation, and many interneurons express soluble guanylyl cyclase, a well-characterized nitric oxide target. We used intracellular recording and staining coupled with pharmacological manipulation of nitric oxide and soluble guanylyl cyclase to test the hypothesis that nitric oxide modulates odor responsiveness in olfactory interneurons through soluble guanylyl cyclase-dependent pathways. Nitric oxide synthase inhibition resulted …
Zoo Research, Amanda Shyne
Lpe Center News, June 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this Issue:
• Webcast Series Takes a Break in July and August
• Value of Manure Resources Available
• LPE Learning Center Expands to Ten Teams
• Vegetative Treatment Systems Research and Demonstration Resources
• Vegetative Treatment Systems Being Evaluated for Large Feedlots
Lpe Center News, May 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue: • June Webcast is Value-Added Processing of Manure• Webcast Planning Underway• Alternative Technologies Web Resources Available • FPPC Program Offers Cost Share for Innovative Manure Technologies • Iowa State to Host Conference on Anaerobic Treatment of Ag Waste
Lpe Center News, April 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue: • Value of Manure in Land Application Systems to be Presented in the May Webcast • What’s New on the LPE Website? • Value of Manure Topic Coming Soon • SBIR Program Encourages Research in New Technologies for Manure Management • Promising Treatment Technology Removes P from Manure
Lpe Center News, March 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue: • Lessons Learned from the Search for Environmentally Superior Technologies is April’s Webcast Topic • Continuing Education Units Now Online • Alternative Technologies Topic Coming Soon • LPES Curriculum Includes Resources for Large and Small Farms • What is Video Streaming and How Do I Get the Best Possible Quality?
Individual Acoustic Variation In Fallow Deer (Dama Dama) Common And Harsh Groans: A Source-Filter Theory Perspective, Elisabetta Vannoni, Alan G. Mcelligott
Individual Acoustic Variation In Fallow Deer (Dama Dama) Common And Harsh Groans: A Source-Filter Theory Perspective, Elisabetta Vannoni, Alan G. Mcelligott
Veterinary Science and Medicine Collection
Mammals are able to distinguish conspecifics based on vocal cues, and the acoustic structure of mammal vocalizations is directly affected by the anatomy and action of the vocal apparatus. However, most studies investigating individual patterns in acoustic signals do not consider a vocal production-based perspective. In this study, we used the source-filter model of vocal production as a basis for investigating the acoustic variability of fallow deer groans. Using this approach, we quantified the potential of each acoustic component to carry information about individual identity. We also investigated if cues to individual identity carry over among the two groan types …
Plasticity In Animal Personality Traits: Does Prior Experience Alter The Degree Of Boldness?, Ashley J. Frost, Alexandra Winrow-Giffen, Paul J. Ashley, Lynne U. Sneddon
Plasticity In Animal Personality Traits: Does Prior Experience Alter The Degree Of Boldness?, Ashley J. Frost, Alexandra Winrow-Giffen, Paul J. Ashley, Lynne U. Sneddon
Ethology Collection
Theoreticians predict that animal ‘personality’ traits may be maladaptive if fixed throughout different contexts, so the present study aimed to test whether these traits are fixed or plastic. Rainbow trout (Onchorhyncus mykiss) were given emboldening or negative experiences in the forms of watching bold or shy individuals responding to novelty or winning or losing fights to examine whether prior experience affected boldness. Bold individuals that lost fights or watched shy demonstrators became more shy by increasing their latency to approach a novel object, whereas shy observers that watched bold demonstrators remained cautious and did not modify their responses to novelty. …
Lpe Center News, February 2007
Lpe Center News, February 2007
Livestock and Poultry Environmental Learning Center Newsletters
In this issue: • Nitrogen Availability from Organic Sources is the Topic of March Webcast • LPE Webcasts Approved for Continuing Education Units • Ag Research Service Website Offers Many Resources • LPE Learning Center Website Adds Nutrient Resources, Expands Pathogen Section, and Offers an Archive of Past Webcasts
Impact Of The Agricultural Sector On The Arkansas Economy In 2003, Jennie Popp, Nathan Kemper, Wayne Miller
Impact Of The Agricultural Sector On The Arkansas Economy In 2003, Jennie Popp, Nathan Kemper, Wayne Miller
Research Reports and Research Bulletins
Agriculture and associated agricultural activities are major contributors to the Arkansas economy. Agriculture is defined as the sum of agricultural production and processing activities, unless otherwise specified, and includes crop and animal production and processing, agricultural support industries, forestry and forest products, and textile goods. Agriculture contributes to the economy through direct agricultural production and value-added processing, and also leads to economic activity in other parts of the economy.
Efecto De La Proporcionalidad De Las Medidas Morfológicas En El Desempeño Productivo De Toretes Brahman En Pastoreo, Juan Pablo Pareja, Carlos Andrés Pinilla
Efecto De La Proporcionalidad De Las Medidas Morfológicas En El Desempeño Productivo De Toretes Brahman En Pastoreo, Juan Pablo Pareja, Carlos Andrés Pinilla
Zootecnia
Éste estudio se realizó para conocer las diferencias de Ganancia Media Diaria (G.M.D.) entre tres (3) rangos (alto, medio y bajo) para los veintiún (21) índices morfológicos generados a partir de la interrelación entre las siete (7) medidas corporales tomadas por Asocebú a los toretes Brahman bajo pruebas de ganancia de peso en pastoreo: altura al sacro (ALSAC), perímetro toráxico (PERTOR), longitud corporal (LONCOR), amplitud de cadera (AMPCAD), amplitud de isquiones (AMPISQ), longitud de anca (LONANC) y circunferencia testicular (CIRTES). Para formar los rangos de cada índice, se calculó el promedio sumándole y restándole una desviación estándar que permitiera delimitar …
The Human/Animal Interface: Emergence And Resurgence Of Zoonotic Infectious Diseases, Michael Greger
The Human/Animal Interface: Emergence And Resurgence Of Zoonotic Infectious Diseases, Michael Greger
Transgenesis Collection
Emerging infectious diseases, most of which are considered zoonotic in origin, continue to exact a significant toll on society. The origins of major human infectious diseases are reviewed and the factors underlying disease emergence explored. Anthropogenic changes, largely in land use and agriculture, are implicated in the apparent increased frequency of emergence and reemergence of zoonoses in recent decades. Special emphasis is placed on the pathogen with likely the greatest zoonotic potential, influenzavirus A.
Grey Parrots Do Not Always ‘Parrot’: The Roles Of Imitation And Phonological Awareness In The Creation Of New Labels From Existing Vocalizations, Irene M. Pepperberg
Grey Parrots Do Not Always ‘Parrot’: The Roles Of Imitation And Phonological Awareness In The Creation Of New Labels From Existing Vocalizations, Irene M. Pepperberg
Sentience Collection
Evidence exists for a form of imitation, vocal segmentation, by a Grey parrot. Data show that the bird understands that his labels are comprised of individual units that can be recombined in novel ways to create a novel referential vocalization; that is, a novel act. Previous data suggested, but could not substantiate, this behaviour. Such evidence implies that a parrot not only has phonological awareness but also demonstrates true imitation rather than mimicry, and has implications for the studies of both the evolution of communicative competence and the development of robotic speech.
Stable Isotopic Niche Predicts Fitness Of Prey In A Wolf–Deer System, C. T. Darimont, P. C. Paquet, T. E. Reimchen
Stable Isotopic Niche Predicts Fitness Of Prey In A Wolf–Deer System, C. T. Darimont, P. C. Paquet, T. E. Reimchen
Evolutionary Biology Collection
Interindividual variation in niche presents a potentially central object on which natural selection can act. This may have important evolutionary implications because habitat use governs a suite of selective forces encountered by foragers. In a free‐living native black‐tailed deer, Odocoileus hemionus, population from coastal British Columbia, we used stable isotope analysis to identify individual variation in foraging niche and investigated its relationship to fitness. Using an intragenerational comparison of surviving and nonsurviving O. hemionus over 2 years of predation by wolves, Canis lupus, we detected resource‐specific fitness. Individuals with isotopic signatures that suggested they foraged primarily in cedar ( …
Their Bugs Are Worse Than Their Bite: Emerging Infectious Disease And The Human-Animal Interface, Michael Greger
Their Bugs Are Worse Than Their Bite: Emerging Infectious Disease And The Human-Animal Interface, Michael Greger
State of the Animals 2007
In the twenty-five years since that announcement, what we now know as AIDS has killed 20 million people (National AIDS Trust 2005). Where did the AIDS virus— and other emerging diseases, such as severe acute respiratory syndrome (SARS), Ebola, mad cow— come from?