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2019

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Articles 31 - 60 of 6811

Full-Text Articles in Life Sciences

Tropical Grasslands--Trends, Perspectives And Future Prospects, Panjab Singh Oct 2019

Tropical Grasslands--Trends, Perspectives And Future Prospects, Panjab Singh

International Grassland Congress Proceedings

This paper attempts a rapid summary of the present day state of tropical grassland and livestock based production systems globally, especially in tropics, in relation to recent trends, future assessment, grassland rehabilitation and management strategies, future perspectives of grassland science and development including policy imperatives.


Importance Of Livestock Production From Grasslands For National And Local Food And Nutritional Security In Developing Countries, Iain A. Wright Oct 2019

Importance Of Livestock Production From Grasslands For National And Local Food And Nutritional Security In Developing Countries, Iain A. Wright

International Grassland Congress Proceedings

Grazing lands cover more than a quarter of the world’s land surface, often on land that is unsuitable for other forms of use. Despite the perception that productivity is inherently low, the contribution of grasslands in food security in developing countries is significant. However the challenges of spatial and temporal variability of primary productivity need to be managed and mobility of livestock is key to this. Appropriate land management and governance arrangements are essential for facilitating this mobility and for creating the circumstances in which technical options for reducing variability and risk in livestock keeping can be deployed and ...


Three Is Company: Fixing The Grazing-Land Business Conundrum, Ralph Von Kaufmann Oct 2019

Three Is Company: Fixing The Grazing-Land Business Conundrum, Ralph Von Kaufmann

International Grassland Congress Proceedings

Grazing-lands have the largest footprint on the world’s land surface area but this is not reflected in the amount of business conducted on them. The most common land use systems are very land intensive, i.e., they use a lot of land to produce not very much and few jobs. The health of the planet depends on having healthy grazing-lands but there is a perfect storm brewing in which the demand from expanding pastoral communities for more food and jobs cannot be met just by applying good grazing-land management practices. Compatible businesses must be found that can create jobs ...


Grassland And Livestock Production: The East African Case, David Miano Mwangi Oct 2019

Grassland And Livestock Production: The East African Case, David Miano Mwangi

International Grassland Congress Proceedings

Grasslands cover over 26% of the world land mass and about 80% of the agricultural area. They are the source of a livelihood for about 1 million people in the developing countries. Livestock contributes 40% of the global value of agricultural outputs. Approximately 60% of rural households keep livestock. In East Africa there are a number of grasslands. The most extensive of these are the Acacia based Savanna grasslands. Others include the sudd flooded grasslands of South Sudan and the Miobo woodlands of Tanzania. More than 60% of the livestock and wildlife in this region are found on these grasslands ...


“Cyst-Ained” Research Into Heterodera Parasitism, Parijat S. Juvale, Thomas J. Baum Oct 2019

“Cyst-Ained” Research Into Heterodera Parasitism, Parijat S. Juvale, Thomas J. Baum

Thomas Baum

Nematodes are roundworms that constitute the phylum Nematoda. Only a small fraction of nematode genera contains plant-parasitic or animal-parasitic species, while the majority of nematodes are free-living [1]. Heterodera glycines, the soybean cyst nematode, is a plant-parasitic nematode causing major damage to soybean production worldwide. Annual United States yield loss estimates due to H. glycines range up to $1.2 billion, likely making this nematode the most serious pathogen threat to sustainable soybean production [2]. While cyst nematode-resistant soybean cultivars are available, they do not control all H. glycines biotypes present in a given field and, therefore, select for virulent ...


The Novel Cyst Nematode Effector Protein 30d08 Targets Host Nuclear Functions To Alter Gene Expression In Feeding Sites, Anju Verma, Chris Lee, Stephanie Morriss, Fiona Odu, Charlotte Kenning, Nancy Rizzo, William G. Spollen, Marriam Lin, Amanda G. Mcrae, Scott A. Givan, Tarek Hewezi, Richard Hussey, Eric L. Davis, Thomas J. Baum, Melissa G. Mitchum Oct 2019

The Novel Cyst Nematode Effector Protein 30d08 Targets Host Nuclear Functions To Alter Gene Expression In Feeding Sites, Anju Verma, Chris Lee, Stephanie Morriss, Fiona Odu, Charlotte Kenning, Nancy Rizzo, William G. Spollen, Marriam Lin, Amanda G. Mcrae, Scott A. Givan, Tarek Hewezi, Richard Hussey, Eric L. Davis, Thomas J. Baum, Melissa G. Mitchum

Thomas Baum

• Cyst nematodes deliver effector proteins into host cells to manipulate cellular processes and establish a metabolically hyperactive feeding site. The novel 30D08 effector protein is produced in the dorsal gland of parasitic juveniles, but its function has remained unknown.

• We demonstrate that expression of 30D08 contributes to nematode parasitism, the protein is packaged into secretory granules, and is targeted to the plant nucleus where it interacts with SMU2 (homologue of suppressor of mec-8 and unc-52 2), an auxiliary spliceosomal protein.

• We show that SMU2 is expressed in feeding sites and a smu2 mutant is less susceptible to nematode infection. In ...


Re‐Targeting Of A Plant Defense Protease By A Cyst Nematode Effector, Gennady V. Pogorelko, Parijat S. Juvale, William B. Rutter, Marion Hütten, Thomas R. Maier, Tarek Hewezi, Judith Paulus, Renier Al Van Der Hoorn, Florian Mw Grundler, Shahid Siddique, Vincenzo Lionetti, Olga A. Zabotina, Thomas J. Baum Oct 2019

Re‐Targeting Of A Plant Defense Protease By A Cyst Nematode Effector, Gennady V. Pogorelko, Parijat S. Juvale, William B. Rutter, Marion Hütten, Thomas R. Maier, Tarek Hewezi, Judith Paulus, Renier Al Van Der Hoorn, Florian Mw Grundler, Shahid Siddique, Vincenzo Lionetti, Olga A. Zabotina, Thomas J. Baum

Thomas Baum

Plants mount defense responses during pathogen attacks, and robust host defense suppression by pathogen effector proteins is essential for infection success. 4E02 is an effector of the sugar beet cyst nematode Heterodera schachtii. Arabidopsis thaliana lines expressing the effector‐coding sequence showed altered expression levels of defense response genes, as well as higher susceptibility to both the biotroph H. schachtii and the necrotroph Botrytis cinerea, indicating a potential suppression of defenses by 4E02. Yeast two‐hybrid analyses showed that 4E02 targets A. thaliana vacuolar papain‐like cysteine protease (PLCP) ‘Responsive to Dehydration 21A’ (RD21A), which has been shown to function ...


Statawaars: A Promoter Motif Associated With Spatial Expression In The Major Effector-Producing Tissues Of The Plant-Parasitic Nematode Bursaphelenchus Xylophilus, Margarida Espada, Sebastian Eves-Van Den Akker, Tom Maier, Paramasivan Vijayapalani, Thomas Baum, Manuel Mota, John T. Jones Oct 2019

Statawaars: A Promoter Motif Associated With Spatial Expression In The Major Effector-Producing Tissues Of The Plant-Parasitic Nematode Bursaphelenchus Xylophilus, Margarida Espada, Sebastian Eves-Van Den Akker, Tom Maier, Paramasivan Vijayapalani, Thomas Baum, Manuel Mota, John T. Jones

Thomas Baum

Background: Plant-parasitic nematodes cause severe damage to a wide range of crop and forest species worldwide. The migratory endoparasitic nematode, Bursaphelenchus xylophilus, (pinewood nematode) is a quarantine pathogen that infects pine trees and has a hugely detrimental economic impact on the forestry industry. Under certain environmental conditions large areas of infected trees can be destroyed, leading to damage on an ecological scale. The interactions of B. xylophilus with plants are mediated by secreted effector proteins produced in the pharyngeal gland cells. Identification of effectors is important to understand mechanisms of parasitism and to develop new control measures for the pathogens ...


Novel Global Effector Mining From The Transcriptome Of Early Life Stages Of The Soybean Cyst Nematode Heterodera Glycines, Michael Gardner, Andi Dhroso, Nathan Johnson, Eric L. Davis, Thomas J. Baum, Dmitry Korkin, Melissa G. Mitchum Oct 2019

Novel Global Effector Mining From The Transcriptome Of Early Life Stages Of The Soybean Cyst Nematode Heterodera Glycines, Michael Gardner, Andi Dhroso, Nathan Johnson, Eric L. Davis, Thomas J. Baum, Dmitry Korkin, Melissa G. Mitchum

Thomas Baum

Soybean cyst nematode (SCN) Heterodera glycines is an obligate parasite that relies on the secretion of effector proteins to manipulate host cellular processes that favor the formation of a feeding site within host roots to ensure its survival. The sequence complexity and co-evolutionary forces acting upon these effectors remain unknown. Here we generated a de novo transcriptome assembly representing the early life stages of SCN in both a compatible and an incompatible host interaction to facilitate global effector mining efforts in the absence of an available annotated SCN genome. We then employed a dual effector prediction strategy coupling a newly ...


Cooperative Regulatory Functions Of Mir858 And Myb83 During Cyst Nematode Parasitism, Sarbottam Piya, Christina Kihm, J. Hollis Rice, Thomas J. Baum, Tarek Hewezi Oct 2019

Cooperative Regulatory Functions Of Mir858 And Myb83 During Cyst Nematode Parasitism, Sarbottam Piya, Christina Kihm, J. Hollis Rice, Thomas J. Baum, Tarek Hewezi

Thomas Baum

MicroRNAs (miRNAs) recently have been established as key regulators of transcriptome reprogramming that define cell function and identity. Nevertheless, the molecular functions of the greatest number of miRNA genes remain to be determined. Here, we report cooperative regulatory functions of miR858 and its MYB83 transcription factor target gene in transcriptome reprogramming during Heterodera cyst nematode parasitism of Arabidopsis (Arabidopsis thaliana). Gene expression analyses and promoter-GUS fusion assays documented a role of miR858 in posttranscriptional regulation of MYB83 in the Heterodera schachtii-induced feeding sites, the syncytia. Constitutive overexpression of miR858 interfered with H. schachtii parasitism of Arabidopsis, leading to reduced ...


Homeostasis In The Soybean Mirna396–Grf Network Is Essential For Productive Soybean Cyst Nematode Infections, Jason B. Noon, Tarek Hewezi, Thomas J. Baum Oct 2019

Homeostasis In The Soybean Mirna396–Grf Network Is Essential For Productive Soybean Cyst Nematode Infections, Jason B. Noon, Tarek Hewezi, Thomas J. Baum

Thomas Baum

Heterodera glycines, the soybean cyst nematode, penetrates soybean roots and migrates to the vascular cylinder where it forms a feeding site called the syncytium. MiRNA396 (miR396) targets growth-regulating factor (GRF) genes, and the miR396–GRF1/3 module is a master regulator of syncytium development in model cyst nematode H. schachtii infection of Arabidopsis. Here, we investigated whether this regulatory system operates similarly in soybean roots and is likewise important for H. glycines infection. We found that a network involving nine MIR396 and 23 GRF genes is important for normal development of soybean roots and that GRF function is specified in ...


A Plasmodium‐Like Virulence Effector Of The Soybean Cyst Nematode Suppresses Plant Innate Immunity, Jason B. Noon, Mingsheng Qi, Danielle N. Sill, Usha Muppirala, Sebastian Eves-Van Den Akker, Thomas R. Maier, Drena Dobbs, Melissa G. Mitchum, Tarek Hewezi, Thomas J. Baum Oct 2019

A Plasmodium‐Like Virulence Effector Of The Soybean Cyst Nematode Suppresses Plant Innate Immunity, Jason B. Noon, Mingsheng Qi, Danielle N. Sill, Usha Muppirala, Sebastian Eves-Van Den Akker, Thomas R. Maier, Drena Dobbs, Melissa G. Mitchum, Tarek Hewezi, Thomas J. Baum

Thomas Baum

• Heterodera glycines, the soybean cyst nematode, delivers effector proteins into soybean roots to initiate and maintain an obligate parasitic relationship. HgGLAND18 encodes a candidate H. glycines effector and is expressed throughout the infection process.

• We used a combination of molecular, genetic, bioinformatic and phylogenetic analyses to determine the role of HgGLAND18 during H. glycines infection.

• HgGLAND18 is necessary for pathogenicity in compatible interactions with soybean. The encoded effector strongly suppresses both basal and hypersensitive cell death innate immune responses, and immunosuppression requires the presence and coordination between multiple protein domains. The N-terminal domain in HgGLAND18 contains unique sequence similarity to ...


Convergent And Alternative Designs For Vertebrate Suspension Feeding, S. Laurie Sanderson Oct 2019

Convergent And Alternative Designs For Vertebrate Suspension Feeding, S. Laurie Sanderson

S. Laurie Sanderson

In this authoritative three-volume reference work, leading researchers bring together current work to provide a comprehensive analysis of the comparative morphology, development, evolution, and functional biology of the skull.


Wastelands Of The Mind: The Identity Crisis Of India’S Savanna Grasslands, Abi Tamim Vanak Oct 2019

Wastelands Of The Mind: The Identity Crisis Of India’S Savanna Grasslands, Abi Tamim Vanak

International Grassland Congress Proceedings

The idea that wastelands are unproductive continues to be pervasive and is used by various agencies to gain control over marginal landscapes and remake them for productive purposes with dire results.


The Effects Of Erosion Structures On Triplett Creek From The Fall Of 2016, 2017, And 2018, Haylee Winters Oct 2019

The Effects Of Erosion Structures On Triplett Creek From The Fall Of 2016, 2017, And 2018, Haylee Winters

Posters-at-the-Capitol

Triplett Creek is a tributary of the Licking River. It runs through Morehead, KY, where we are conducting our research.

The creek was modified in the 1970s but construction was halted before the project was complete. Unfortunately, the result was an increase in overflow and subsequent riverbank erosion. The city installed sediment trap rocks in hopes of slowing down the water and decreasing erosion. We are using drones and photogrammetric software to map the area and compare images of the river to determine erosion rates. The new images will be compared to ones taken in previous years to visualize the ...


Use Of Old Order Anabaptist-Produced Publications To Develop An Injury Surveillance System For Old Order Populations, Paul Jones, William Field, Donald Kraybill, Stephen Scott Oct 2019

Use Of Old Order Anabaptist-Produced Publications To Develop An Injury Surveillance System For Old Order Populations, Paul Jones, William Field, Donald Kraybill, Stephen Scott

Journal of Amish and Plain Anabaptist Studies

To achieve a clearer picture of injuries within Old Order Anabaptist communities, Purdue University’s Agricultural Safety and Health Program collaborated with the Young Center for Anabaptist and Pietist Studies at Elizabethtown College to conduct a pilot study on this topic. The team developed an injury surveillance system based not on traditional injury data sources and instruments but on data provided in Old Order-produced publications, specifically The Budget, Die Botschaft, and The Diary. While traditional surveillance methods have generally yielded injury data on less than 30 Old Order cases per year, the Old Order Injury Database, developed through the Purdue ...


Description Of The Adult Male Of Euscorpius Feti Tropea, 2013 (Scorpiones: Euscorpiidae), With Notes On Cave Ecology Of This Species, Gioele Tropea, Roman Ozimec Oct 2019

Description Of The Adult Male Of Euscorpius Feti Tropea, 2013 (Scorpiones: Euscorpiidae), With Notes On Cave Ecology Of This Species, Gioele Tropea, Roman Ozimec

Euscorpius

The adult male of Euscorpius feti Tropea, 2013 (Euscorpiidae) is described for the first time. A large series (45 specimens including the type material) has been studied, most of the material previously unpublished. E. feti has been found in as many as 17 caves in Croatia and Bosnia-Herzegovina, including the Adriatic islands, which makes it the most common Euscorpius species so far found in caves. Ecological notes on this species are presented.


Depaul Digest Oct 2019

Depaul Digest

DePaul Magazine

DePaulia Fantasy Football League; Democratizing Medicine; Campus/Alumni Calendar of Events; Regional Chapters; Musings: DePaul FEST; Milestones; Student Profile: Gabby Henderson; Master Class: The Perniciousness of "Ethical Decision-Making"


Reproductive Parameters And Female Breeding Season Survival Of Rio Grande Wild Turkeys In South Central Texas, Jacob White Oct 2019

Reproductive Parameters And Female Breeding Season Survival Of Rio Grande Wild Turkeys In South Central Texas, Jacob White

LSU Master's Theses

Historically, Rio Grande wild turkeys in south central Texas have been at lower densities than other portions of the state. Within the Oak-Prairie Wildlife District of Texas, Rio Grande wild turkey regulatory restrictions are different for counties in the eastern and western portions of the ecoregion. Due to perceived increases in turkey density in the eastern portion of the ecoregion (hereafter 1-bird zone), Texas Parks and Wildlife Department (TPWD) considered increasing the bag limit to match counties in the western portion of the district (hereafter 4-bird zone) in order to increase hunting opportunities. However, if regulatory changes are to be ...


Canavalia And Dolichos Extracts For Sustainable Pest Biocontrol And Plant Nutrition Improvement In El Salvador, Carlos Martinez Oct 2019

Canavalia And Dolichos Extracts For Sustainable Pest Biocontrol And Plant Nutrition Improvement In El Salvador, Carlos Martinez

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Botanical repellents and pesticides are now being rediscovered as new tools for integrated pest management in order to reduce the use of toxic chemicals in crop production. Canavalia gladiata and Dolichos lablab are two Fabaceae very well adapted to farmlands of El Salvador, effective as living barriers and mostly as cover crops, however, they are not yet very well disseminated. This document describes the potential for using the liquid extracts and the dry flour of raw seeds of those plants for economic benefit and practical convenience for pest management in Salvadorian agriculture under field conditions. Seed extracts were useful when ...


The Efficacy Of Applied Behavior Analysis On The Quality Of Critical Life Skills In Autistic Youth, Olukayode A. Akinsola Jr, Denah Appelt Oct 2019

The Efficacy Of Applied Behavior Analysis On The Quality Of Critical Life Skills In Autistic Youth, Olukayode A. Akinsola Jr, Denah Appelt

Denah Appelt

Autism spectrum disorder (ASD) is a developmental disorder characterized by difficulties in social interaction, social communication, restricted and repetitive patterns of behavior, and interest or activities. As of 2013, ASD is no longer an individual entity but rather an umbrella term encompassing other distinctive developmental disorders. Signs and symptoms of ASD can appear anywhere from birth to three years of life. Various behavioral modalities exist for the treatment of ASD, which is considered to be the gold standard of care. One of the newest behavioral modalities is applied behavior analysis (ABA) therapy. The general purpose of ABA therapy is the ...


Analysis Of The Gut-Brain Axis In Aging: Implications In Alzheimer Disease, Molly Martin, Mary Austin, Denah Appelt Oct 2019

Analysis Of The Gut-Brain Axis In Aging: Implications In Alzheimer Disease, Molly Martin, Mary Austin, Denah Appelt

Denah Appelt

The gut microbiome is comprised of the shared genome of the trillions of microorganisms residing in the gastrointestinal ecosystem. The interaction between the host and its gut microbiome, the Gut-Bran Axis (GBA), is a complex relationship whose management could prove critical to preventing or treating not only various gut disorders, like irritable bowel syndrome (IBS) or behavioral health disorders such as general depression and anxiety, but also central nervous system (CNS) disorders, such as Alzheimer's (AD) and Parkinson's (PD) diseases. The purpose of this review is to summarize what is currently known about the gut microbiome, how it ...


Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn Oct 2019

Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn

Steven J. Hoff

The US swine industry is shifting towards filtered fresh-air ventilation systems that use pleated filters to improve breeding herd health and reduce airborne disease outbreak frequency. Loaded filters reduce airflow causing a poor environment and elevated energy use. Typical axial fans cannot efficiently maintain the rated differential pressure (DP; 100 Pa) for pleated filters; hence, a lower design filter DP (37 Pa) is used and consequently, more filters are required to achieve design maximum ventilation. Large, common filter banks for multiple staged fans presents significant challenges in using continuous DP measurement to assess filter life, making it impossible to separate ...


Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn Oct 2019

Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn

Jay D. Harmon

The US swine industry is shifting towards filtered fresh-air ventilation systems that use pleated filters to improve breeding herd health and reduce airborne disease outbreak frequency. Loaded filters reduce airflow causing a poor environment and elevated energy use. Typical axial fans cannot efficiently maintain the rated differential pressure (DP; 100 Pa) for pleated filters; hence, a lower design filter DP (37 Pa) is used and consequently, more filters are required to achieve design maximum ventilation. Large, common filter banks for multiple staged fans presents significant challenges in using continuous DP measurement to assess filter life, making it impossible to separate ...


Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn Oct 2019

Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn

Brett Ramirez

The US swine industry is shifting towards filtered fresh-air ventilation systems that use pleated filters to improve breeding herd health and reduce airborne disease outbreak frequency. Loaded filters reduce airflow causing a poor environment and elevated energy use. Typical axial fans cannot efficiently maintain the rated differential pressure (DP; 100 Pa) for pleated filters; hence, a lower design filter DP (37 Pa) is used and consequently, more filters are required to achieve design maximum ventilation. Large, common filter banks for multiple staged fans presents significant challenges in using continuous DP measurement to assess filter life, making it impossible to separate ...


Long-Term Impact Of Poultry Manure On Crop Yield, Soil And Water Quality, And Crop Revenue, Natasha L. Hoover, Ji Yeow Law, Leigh Ann M. Long, Rameshwar S. Kanwar, Michelle L. Soupir Oct 2019

Long-Term Impact Of Poultry Manure On Crop Yield, Soil And Water Quality, And Crop Revenue, Natasha L. Hoover, Ji Yeow Law, Leigh Ann M. Long, Rameshwar S. Kanwar, Michelle L. Soupir

Rameshwar S. Kanwar

A long-term poultry manure fertilizer study was initiated in 1998 and continued until 2009 under corn-soybean (CS) rotation. To match changing landscape trends, the plots were switched to continuous corn (CC) from 2010 to 2017. In both CS and CC phases, poultry manure (PM) was applied at the crop rotation recommended agronomic N rate and either half (CC phase) or double (CS phase) the recommended rate. Urea-ammonium nitrate (UAN) was applied to comparison plots at the crop recommended application rate (168 kg N ha−1 and 224 kg N ha−1 for the CS and CC phases, respectively) throughout the ...


Long-Term Impact Of Poultry Manure On Crop Yield, Soil And Water Quality, And Crop Revenue, Natasha L. Hoover, Ji Yeow Law, Leigh Ann M. Long, Rameshwar S. Kanwar, Michelle L. Soupir Oct 2019

Long-Term Impact Of Poultry Manure On Crop Yield, Soil And Water Quality, And Crop Revenue, Natasha L. Hoover, Ji Yeow Law, Leigh Ann M. Long, Rameshwar S. Kanwar, Michelle L. Soupir

Michelle L. Soupir

A long-term poultry manure fertilizer study was initiated in 1998 and continued until 2009 under corn-soybean (CS) rotation. To match changing landscape trends, the plots were switched to continuous corn (CC) from 2010 to 2017. In both CS and CC phases, poultry manure (PM) was applied at the crop rotation recommended agronomic N rate and either half (CC phase) or double (CS phase) the recommended rate. Urea-ammonium nitrate (UAN) was applied to comparison plots at the crop recommended application rate (168 kg N ha−1 and 224 kg N ha−1 for the CS and CC phases, respectively) throughout the ...


Application Of Models To Screwworm Eradication Programs, E. S. Krafsur Oct 2019

Application Of Models To Screwworm Eradication Programs, E. S. Krafsur

Elliot Krafsur

Screwworms (Cochliomyia hominivorax, Diptera: Calliphoridae) were eradicated from the United States with E.F. Knipling's 'demonstrative' model that related the relative mating proportions of wild and sterile insects to population fertility and predicted population trends in subsequent generations. Ad hoc correlations between treatments applied and experimental results obtained on Sanibel Island, Florida, in 1952-1953, Curacao, Netherlands East Indies in 1954, and the Florida mainland in 1957 provided a conceptual guide for the eradication campaigns from 1958 until 1967. Many mathematical models have since been proposed that relate pest insect population density at some future time to density, fertility, net ...


The Dragonflies And Damselflies Of Nebraska, Fred Sibley, Janis Paseka, Roy Beckemeyer Oct 2019

The Dragonflies And Damselflies Of Nebraska, Fred Sibley, Janis Paseka, Roy Beckemeyer

Zea E-Books

Odonates of Nebraska

The Nebraska odonate list has 109 species in two suborders, damselflies (Zygoptera) with 47 species and dragonflies (Anisoptera) with 62 species. Nebraska had been very poorly surveyed prior to 2005 and 63 counties had fewer than 10 records. By 2017 the number of county records had nearly quadrupled, to over 3000 records, the average county total had increased from 9 to 33 and all counties had at least 21 records. An effort was made to collect data more or less uniformly from all 93 Nebraska counties. The areas with intense corn and soybean farming, eastern and southcentral ...


Founders Of Plant Ecology: Frederic And Edith Clements, Jon H. Oberg Oct 2019

Founders Of Plant Ecology: Frederic And Edith Clements, Jon H. Oberg

Publications of UNSM Staff and Affiliates

Nineteenth-century students of Charles Bessey at the University of Nebraska, Frederic Clements and Edith Schwartz received doctorates in botany, married, and went on to become founders of the discipline of plant ecology. They tested and taught their theory of plant succession, known as Clementsian ecology, for nearly four decades at their Alpine laboratory in Colorado. Their leadership and influence at the Carnegie Institution was world-wide and attracted followers from several other disciplines. They advocated land use measures to combat the Dust Bowl in the 1930s. Clementsian ecology is still recognized as a paradigm against which other theories of nature are ...