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160260 full-text articles. Page 6 of 3720.

Compensatory Dynamics In Planktonic Community Responses To Ph Perturbations, Jennifer L. Klug, Janet M. Fischer, Anthony R. Ives, Brian Dennis 2017 Fairfield University

Compensatory Dynamics In Planktonic Community Responses To Ph Perturbations, Jennifer L. Klug, Janet M. Fischer, Anthony R. Ives, Brian Dennis

Jennifer L. Klug

Compensatory population dynamics, in which species that decline in response to an environmental perturbation are replaced by similar species, may be crucial in maintaining processes performed by functional groups of species. Compensatory dynamics may be produced by negative interactions among species, such that the decrease in abundance of a species releases the suppression of another species and allows it to increase. We conducted a mesocosm experiment in Trout Lake, Wisconsin, USA, to test the hypothesis that compensatory shifts in species abundances play a role in overall planktonic community response to pH perturbation. In 2000-L mesocosms over a period of six ...


Bottle Or Big-Scale Studies: How Do We Do Ecology?, Anthony R. Ives, Johannes Foufopoulos, Eric D. Klopfer, Jennifer L. Klug, Todd M. Palmer 2017 Fairfield University

Bottle Or Big-Scale Studies: How Do We Do Ecology?, Anthony R. Ives, Johannes Foufopoulos, Eric D. Klopfer, Jennifer L. Klug, Todd M. Palmer

Jennifer L. Klug

No abstract provided.


Goats Display Audience-Dependent Human-Directed Gazing Behaviour In A Problem-7 Solving Task, Christian Nawroth, Jemma M. Brett, Alan G. McElligott 2017 Queen Mary University of London

Goats Display Audience-Dependent Human-Directed Gazing Behaviour In A Problem-7 Solving Task, Christian Nawroth, Jemma M. Brett, Alan G. Mcelligott

Alan G. McElligott, Ph.D.

Domestication is an important factor driving changes in animal cognition and behaviour. In particular, the capacity of dogs to communicate in a referential and intentional way with humans is considered a key outcome of how domestication as a companion animal shaped the canid brain. However, the lack of comparison with other domestic animals makes general conclusions about how domestication has affected these important cognitive features difficult. We investigated human-directed behaviour in an ‘unsolvable problem’ task in a domestic, but non-companion species: goats. During the test, goats experienced a forward facing or an away facing person. They gazed towards the forward ...


Human Head Orientation And Eye Visibility As Indicators Of Attention For Goats (Capra Hircus), Christian Nawroth, Alan G. McElligott 2017 Queen Mary University of London

Human Head Orientation And Eye Visibility As Indicators Of Attention For Goats (Capra Hircus), Christian Nawroth, Alan G. Mcelligott

Alan G. McElligott, Ph.D.

Animals domesticated for working closely with humans (e.g. dogs) have been shown to be remarkable in adjusting their behaviour to human attentional stance. However, there is little evidence for this form of information perception in species domesticated for production rather than companionship. We tested domestic ungulates (goats) for their ability to differentiate attentional states of humans. In the first experiment, we investigated the effect of body and head orientation of one human experimenter on approach behaviour by goats. Test subjects (N = 24) significantly changed their behaviour when the experimenter turned its back to the subjects, but did not take ...


Goats Learn Socially From Humans In A Spatial Problem-Solving Task, Christian Nawroth, Luigi Baciadonna, Alan G. McElligott 2017 Queen Mary University of London

Goats Learn Socially From Humans In A Spatial Problem-Solving Task, Christian Nawroth, Luigi Baciadonna, Alan G. Mcelligott

Alan G. McElligott, Ph.D.

Domestication drives changes in animal cognition and behaviour. In particular, the capacity of dogs to socially learn from humans is considered a key outcome of how domestication shaped the canid brain. However, systematic evidence for social learning from humans in other domestic species is lacking and makes general conclusions about how domestication has affected cognitive abilities difficult. We assessed spatial and social problem-solving abilities in goats (Capra hircus) using a detour task, in which food was placed behind an inward or outward V-shaped hurdle. Goats performed better in the outward than in the inward detour without human demonstration. Importantly, a ...


Cross-Modal Recognition Of Familiar Conspecifics In Goats, Benjamin J. Pitcher, Elodie Briefer, Luigi Baciadonna, Alan G. McElligott 2017 Queen Mary University of London

Cross-Modal Recognition Of Familiar Conspecifics In Goats, Benjamin J. Pitcher, Elodie Briefer, Luigi Baciadonna, Alan G. Mcelligott

Alan G. McElligott, Ph.D.

When identifying other individuals, animals may match current cues with stored information about that individual from the same sensory modality. Animals may also be able to combine current information with previously acquired information from other sensory modalities, indicating that they possess complex cognitive templates of individuals that are independent of modality. We investigated whether goats (Capra hircus) possess cross-modal representations (auditory–visual) of conspecifics. We presented subjects with recorded conspecific calls broadcast equidistant between two individuals, one of which was the caller. We found that, when presented with a stablemate and another herd member, goats looked towards the caller sooner ...


Daily Eclosion Pattern Of The Saratoga Spittlebug, Aphrophora Saratogensis (Fitch) (Homoptera: Cercopidae), Louis F. Wilson, Patrick C. Kennedy 2017 United States Department of Agriculture

Daily Eclosion Pattern Of The Saratoga Spittlebug, Aphrophora Saratogensis (Fitch) (Homoptera: Cercopidae), Louis F. Wilson, Patrick C. Kennedy

The Great Lakes Entomologist

The Saratoga spittlebug, Aphrophora saratogensis (Fitch), is a destructive pest of young planted pines in the Lake States. The adults injure the pines by feeding on the sap of branches. However, nymphs feed on the sap of alternate host plants, which include many herbs and woody plants on the forest floor. Our studies show that the time of the eclosion and shortly thereafter is one of the most vulnerable periods in the insect's life cycle. During this period the nymphs must free themselves from the eggs that are on pine buds, vacate the pines, search out suitable host plants ...


Within-Tree Distribution Of The Jack Pine Tip Beetle, Conophthorus Banksianae Mcpherson, On Jack Pine, David J. Hall, Louis F. Wilson 2017 Wisconsin Department of Natural Resources

Within-Tree Distribution Of The Jack Pine Tip Beetle, Conophthorus Banksianae Mcpherson, On Jack Pine, David J. Hall, Louis F. Wilson

The Great Lakes Entomologist

The jack pine tip beetle (Conophthorus banksianae McPherson) attacks the shoot tips of jack pine (Pinus banksiana Lamb.) and other pines, killing the apical one inch of the shoot and thus causing crooks and forks in the branches and main stem. Several recent studies on the insect have present the bionomics, host relations, and mortality (McPherson, Wilson, and Stehr, 1970; McPherson, Stehr, and Wilson, 1970; Hall and Wilson, 1974), as part of a project to learn its importance to the forest resource and to seek potential control methods. In the part of the study reported here we wanted to know ...


Injury To Aldrin-Treated And Untreated Red Pine By White Grubs (Coleoptera: Scarabaeidae) And Other Agents During First Five Years After Planting, Richard F. Fowler, Louis F. Wilson 2017 United States Department of Agriculture

Injury To Aldrin-Treated And Untreated Red Pine By White Grubs (Coleoptera: Scarabaeidae) And Other Agents During First Five Years After Planting, Richard F. Fowler, Louis F. Wilson

The Great Lakes Entomologist

Freshly planted red pine (Pinus resinosa Ait.) seedlings are vulnerable to injury by several agents. White grubs -- the larvae of May beetles (Phyllophaga spp.) -- are among these agents and sometimes must be controlled in areas scheduled for pine planting. A study was begun in 1967 to evaluate the effectiveness of applying three levels of aldrin for controlling white grubs in the Upper Peninsula of Michigan. After two years white grubs were satisfactorily suppressed by the three treatments tested (Fowler and Wilson 1971a). Reported here is a continuation of that study for five years following planting. We wanted to learn the ...


Scabies By Kenneth Mellamby, Harold D. Newson 2017 Michigan State University

Scabies By Kenneth Mellamby, Harold D. Newson

The Great Lakes Entomologist

Book Review of Scabies by Kenneth Mellamby. Second Edition. E.W. Classey Limited, London, 1972.


North American Species Of The Genus Axonopsis (Acarina: Aturidae: Axonopsinae), David R. Cook 2017 Wayne State University

North American Species Of The Genus Axonopsis (Acarina: Aturidae: Axonopsinae), David R. Cook

The Great Lakes Entomologist

(excerpt) Members of the genus Axonopsis have a broad zoogeographic distribution but are unreported from the Australian region and South America south of Colombia. Species occur in permanent standing waters and streams (including interstitial water). Representa- tives of four subgenera, Axonopsis s. s., Brachypodopsis, Paraxonopsis and Vicinaxonopsis, have been collected in North America, and a species of the closely related genus Erebaxonopsis is also known from interstitial waters in California. The only anomalous aspects of the distributional patterns are the apparent absence of Hexaxonopsis (which has a relatively widespread Palearctic range) and the stream (and interstitial) habitat of the North ...


Effects Of A Prescribed Burn On The Adult Butterfly Assemblage Of A Coastal Grassland, J. Nicole DeSha, Joseph Colbert, Kimberly M. Andrews, Scott Coleman, C. Tate Holbrook 2017 College of Coastal Georgia

Effects Of A Prescribed Burn On The Adult Butterfly Assemblage Of A Coastal Grassland, J. Nicole Desha, Joseph Colbert, Kimberly M. Andrews, Scott Coleman, C. Tate Holbrook

Georgia Journal of Science

Coastal grasslands are globally threatened by development and natural succession. In the southeastern United States, these increasingly rare ecosystems are being managed using prescribed fire, but ecological responses to fire management are largely unknown, particularly among nontargeted species. We tested for short-term effects of controlled burning on the abundance and species richness of adult butterflies, which utilize coastal grasslands for nectaring resources and as migratory stopover sites. In February 2015, four plots of coastal grassland on Little St. Simons Island, GA were burned and paired with unburned (control) plots of equal size. Throughout the following summer-fall flight season, we conducted ...


Protective Effect Of Beta-Sitosterol Against Ethanol Toxemia, Dakota Cooper, April Boucher-Zamzo 2017 Minnesota State University, Mankato

Protective Effect Of Beta-Sitosterol Against Ethanol Toxemia, Dakota Cooper, April Boucher-Zamzo

Journal of Undergraduate Research at Minnesota State University, Mankato

Herbal medications have no indications of interactions with alcohol on their labels. There has been at least one clinical finding that saw palmetto with active ingredient beta-sitosterol used for enlarged male prostates caused pancreatic damage. This study with 20 male mice hypothesized that ethanol would increase the toxicity of beta-sitosterol. It was found that mice dosed by gavage with 0.1 ml of 95 proof ethanol died starting at the second dose and increased to 100% by the sixth dose (unexpected based on literature). 60-microgram injections of beta-sitosterol prevented deaths in 80% of the mice past the sixth dose opposite ...


Effects Of Salinity And Wet–Dry Treatments On C And N Dynamics In Coastal-Forested Wetland Soils: Implications Of Sea Level Rise, Xijun Liu, Alexander Ruecker, Bo Song, William H. Conner, Alex T. Chow 2017 Anhui Agricultural University

Effects Of Salinity And Wet–Dry Treatments On C And N Dynamics In Coastal-Forested Wetland Soils: Implications Of Sea Level Rise, Xijun Liu, Alexander Ruecker, Bo Song, William H. Conner, Alex T. Chow

Publications

Forested wetlands dominated by baldcypress (Taxodium distichum) and water tupelo (Nyssa aquatica) are commonly found in coastal regions of the southeastern United States. Global climate change and in particular sea level rise will alter the frequency and magnitude of wet/dry periods and salinity levels in these ecosystems. Soil microcosm experiments were set up to identify the effects of water level variations (0.4–3.0 g-water g-soil−1) and salinity changes (0, 1 and 5 ppt of NaCl) on greenhouse gas emissions (CH4, CO2, and N2O) and dissolved organic carbon (DOC) characteristics from forested wetland soils. Our results indicate ...


Table Of Contents, 2017 Tuskegee University

Table Of Contents

Professional Agricultural Workers Journal

No abstract provided.


Overview Of The Us Forest Service Programs And Opportunities For Partnership, Cultivating A Culture Of Success In Natural Resources: Moving Outreach Forward In Conversation, Tony Tooke 2017 U.S. Forest Service

Overview Of The Us Forest Service Programs And Opportunities For Partnership, Cultivating A Culture Of Success In Natural Resources: Moving Outreach Forward In Conversation, Tony Tooke

Professional Agricultural Workers Journal

No abstract provided.


The Potential Impact Of Heir Property On Timber Management In The Southeastern United States, Becky Barlow, Conner Bailey 2017 Auburn University

The Potential Impact Of Heir Property On Timber Management In The Southeastern United States, Becky Barlow, Conner Bailey

Professional Agricultural Workers Journal

Abstract

Active timberland management maintains forest health and productivity, which in turn contributes to the sustainability of the resource and wealth of the landowner. However, when land is held as heir property, options for timberland management are often limited. Heir property is owned as an undivided interest among many heirs of an original owner, or multiple generations of owners, who died intestate. This is common among African American landowners in the South. As a result the title is considered “clouded,” limiting access to capital and resources that are beneficial to timberland management. In this paper, the authors hope to improve ...


Landowners' Willingness To Supply Woody Biomass For Biofuel In West Alabama, Gilbert Adjoyi, Ellene Kebede 2017 Tuskegee University

Landowners' Willingness To Supply Woody Biomass For Biofuel In West Alabama, Gilbert Adjoyi, Ellene Kebede

Professional Agricultural Workers Journal

Abstract

The Concern for national energy security, rural development, and climate change has created a wider attention for biofuels from woody biomass in recent times. For instance, West Alabama is an area of interest for stakeholders regarding the production of woody biomass. Therefore, the main objective of this study was to examine landowners’ willingness to supply woody biomass for biofuel in West Alabama. A mail survey of randomly selected landowners was conducted in eight selected counties. The results indicated that the average forestland owner is male, between ages of 40 and 57, with an average of 27 years of land ...


Economies Of Scale In Integrated Pest Management In Vegetable And Fruit Production, Franklin Quarcoo, Conrad Bonsi, David Nii O. Tackie, Walter A. Hill, Gertrude Wall, George Hunter 2017 Tuskegee University

Economies Of Scale In Integrated Pest Management In Vegetable And Fruit Production, Franklin Quarcoo, Conrad Bonsi, David Nii O. Tackie, Walter A. Hill, Gertrude Wall, George Hunter

Professional Agricultural Workers Journal

Abstract

Pest management is achieved directly using a variety of tools, including pesticides, and indirectly through a number of agronomic/cultural practices such as irrigation and fertilizer application; collectively these practices function to positively effect general plant health. Healthier plants are more resistant to or tolerant of pests. This study explores the scale differences that impact the pest management significance and suitability of certain agronomic practices. Scale differences were discussed using literature-based information, direct field observations, and anecdotal information on the relative advantages of drip and sprinkler irrigation systems; organic and conventional cultivation of crops; crop rotation versus mono-cropping systems ...


Abridged Submission Guidelines For Manuscripts For The Professional Agricultural Workers Journal (Pawj), 2017 Tuskegee University

Abridged Submission Guidelines For Manuscripts For The Professional Agricultural Workers Journal (Pawj)

Professional Agricultural Workers Journal

No abstract provided.


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