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Articles 61 - 90 of 113
Full-Text Articles in Entire DC Network
A Literature Review And Survey Of The Status Of Iowa's Terrestrial Flora, Deborah Q. Lewis
A Literature Review And Survey Of The Status Of Iowa's Terrestrial Flora, Deborah Q. Lewis
Journal of the Iowa Academy of Science: JIAS
A survey of Iowa's floristic literature and herbarium resources indicates that while there is not uniform coverage of plant groups and regions, a great deal is known about the Iowa flora. Taxonomic and floristic studies are ongoing, despite evidence of a decreased number of researchers with expertise and interest in Iowa's flora and changing emphases in academic research. Current knowledge is sufficient for the production of an Iowa Flora, and an Iowa Flora committee to initiate this project is proposed.
The Evolution Of Human Ecological Systems During The Period Of European Colonization And Mercantile Expansion: A Preliminary Assessment, Robbie Etheridge
The Evolution Of Human Ecological Systems During The Period Of European Colonization And Mercantile Expansion: A Preliminary Assessment, Robbie Etheridge
Journal of Ecological Anthropology
No abstract provided.
Recent Publications On Waders 72, Henk Koffijberg
Recent Publications On Waders 72, Henk Koffijberg
Wader Study Group Bulletin
No abstract provided.
Geographical Variation In Male Courtship Behavior And Sexual Isolation In Wolf Spiders Of The Genus Schizocosa, Gary L. Miller, Gary L. Stratton, Patricia R. Miller, Eileen Hebets
Geographical Variation In Male Courtship Behavior And Sexual Isolation In Wolf Spiders Of The Genus Schizocosa, Gary L. Miller, Gary L. Stratton, Patricia R. Miller, Eileen Hebets
Eileen Hebets Publications
We surveyed 12 populations of the wolf spider Schizocosa crassipes (Walckenaer) and S. nr. crassipes in Tennessee, Mississippi, Louisiana, and Florida, in the United States, to determine the extent of variation in male courtship behavior when observed in standard laboratory conditions. We observed variation in both the frequency of occurrence and the sequence of the four principal male courtship behaviors and, when compared statistically, most of these behaviors differed between populations. Although there was no clinal pattern in the frequency of courtship behavior, we observed geographically consistent patterns in the sequence in which male courtship behaviors are displayed. We conducted …
Influence Of Soybean Canopy Closure On Predator Abundances And Predation On Helicoverpa Zea (Lepidoptera: Noctuidae) Eggs, Aaron C. Anderson, Kenneth V. Yeargan
Influence Of Soybean Canopy Closure On Predator Abundances And Predation On Helicoverpa Zea (Lepidoptera: Noctuidae) Eggs, Aaron C. Anderson, Kenneth V. Yeargan
Entomology Papers from Other Sources
Planting soybeans [Glycine max (L.) Merrill early and in narrow rows is the most effective cultural control for preventing outbreaks of Helicoverpa zea (Boddie) in soybean. Soybeans planted early in narrow rows close canopy earlier in the season compared with soybeans planted late and in wide rows (i.e., leaves of plants from adjacent rows touch each other and eventually become densely interwoven). Although several lines of research have established dramatically higher mortality for corn earworm eggs or small larvae in closed canopies, none has found the cause. In 1994 and 1995, we planted soybeans in every combination of early …
Comparison Of Recent Coral Life And Death Assemblages To Pleistocene Reef Communities: Implications For Rapid Faunal Replacement On Recent Reefs, Benjamin J. Greenstein, Lora A. Harris, H. Allen Curran
Comparison Of Recent Coral Life And Death Assemblages To Pleistocene Reef Communities: Implications For Rapid Faunal Replacement On Recent Reefs, Benjamin J. Greenstein, Lora A. Harris, H. Allen Curran
Geosciences: Faculty Publications
Marine ecologists and paleoecologists are increasingly recognizing that the Pleistocene and Holocene fossil record of coral reefs is the exclusive database from which an assessment of the long-term responses of reef communities to environmental perturbations may be obtained. The apparent persistence of coral communities in the face of intense fluctuations in sea level and sea surface temperature during glacial and interglacial stages of Pleistocene time is in marked contrast to dramatic fluctuations in reef community structure documented by short-term monitoring studies. We compared the taxonomic structure of live and dead coral communities on a modem patch reef currently undergoing a …
Carrion Beetles (Coleoptera: Silphidae) Of Northeastern Iowa: A Comparison Of Baits For Sampling, David R. Coyle, Kirk J. Larsen
Carrion Beetles (Coleoptera: Silphidae) Of Northeastern Iowa: A Comparison Of Baits For Sampling, David R. Coyle, Kirk J. Larsen
Journal of the Iowa Academy of Science: JIAS
Carrion beetles (Coleoptera: Silphidae) were inventoried over a 8-week period from June into August of 1996 at 10 sites in 4 counties of extreme northeastern Iowa. Carrion preference and relative abundance of carrion beetles were studied by use of non-lethal pitfall traps constructed from large plastic plant pots and baited with aged fish, beef liver, chicken, or piglets. A total of 3,183 carrion beetles were collected, representing 11 different species. The most commonly encountered species of carrion beetles in northeastern Iowa included Necrophila americana (71.5%) and Oiceoptoma novaboracense (18.5%). When comparing baits, chicken and fish attracted the greatest number of …
Plant Conservation In The Juan Fernandez Archipelago, Chile, Tod F. Stuessy, Ulf Swenson, Daniel J. Crawford, Gregory Anderson, Mario Silva O.
Plant Conservation In The Juan Fernandez Archipelago, Chile, Tod F. Stuessy, Ulf Swenson, Daniel J. Crawford, Gregory Anderson, Mario Silva O.
Aliso: A Journal of Systematic and Floristic Botany
Oceanic archipelagos often hold very specialized floras with high degrees of endemism. These floras are frequently highly vulnerable to disturbance by natural causes and human intervention. The Juan Fernandez Islands (Chile) in the Pacific Ocean are a small archipelago of only three islands. Since discovery in 1574 by Juan Fernandez, human activities have altered floristic composition and survival circumstances of the endemic species. In this paper we document past and present means of disturbance, both anthropogenic and natural, which have influenced the native vegetation. The most destructive past activities have been logging and .introduction of animals and plants, both deliberately …
Energetic Constraints To The Distribution And Abundance Of The California Gnatcatcher, Patrick J. Mock
Energetic Constraints To The Distribution And Abundance Of The California Gnatcatcher, Patrick J. Mock
Western Birds
No abstract provided.
Mammals Of Iowa: Holocene To The End Of The 20th Century, John B. Bowles, Daryl L. Howell, Richard P. Lampe, Howard P. Whidden
Mammals Of Iowa: Holocene To The End Of The 20th Century, John B. Bowles, Daryl L. Howell, Richard P. Lampe, Howard P. Whidden
Journal of the Iowa Academy of Science: JIAS
This review of Iowa's mammal fauna at the close of the 20th century summarizes changes in distributional patterns following Euroamerican settlement in the early 1800s. Data from historical records, museum specimens, and presettlement late Holocene fossils indicate presence of 69 resident mammals at that time. Hunting pressures and the conversion of prairie and forest to agricultural fields reduced the populations and ranges of many state mammals, and 14 species were extirpated by 1900. An additional 15 species are either uncommon or rare today, and the Iowa Department of Natural Resources lists four species as endangered, three as threatened and one …
Abstracts From The Special Wsg Conference, South Africa 1998, Wader Study Group Bulletin
Abstracts From The Special Wsg Conference, South Africa 1998, Wader Study Group Bulletin
Wader Study Group Bulletin
No abstract provided.
Recent Literature, Journal Of Field Ornithology
Recent Literature, Journal Of Field Ornithology
Journal of Field Ornithology
No abstract provided.
Adding Nutrients To Enhance The Growth Of Endangered Sockeye Salmon: Trophic Transfer In An Oligotrophic Lake, Phaedra E. Budy, Chris Luecke, Wayne A. Wurtsbaugh
Adding Nutrients To Enhance The Growth Of Endangered Sockeye Salmon: Trophic Transfer In An Oligotrophic Lake, Phaedra E. Budy, Chris Luecke, Wayne A. Wurtsbaugh
Watershed Sciences Faculty Publications
Snake River sockeye salmon Oncorhynchus nerka, listed under U.S. law as endangered in 1991 in response to a decline in anadromous adult numbers, spend their first 1–2 years in Redfish Lake, Idaho, before migrating to the sea. To determine how nutrient enhancement might influence phytoplankton, zooplankton, and fish production, we performed fertilization experiments in large enclosures in this oligotrophic lake using juvenile kokanee (lacustrine O. nerka) as analogues for endangered sockeye salmon. Fertilization of the metalimnion substantially increased chlorophyll a (150%), phytoplankton biovolume (75%), primary productivity (250%), and zooplankton biomass (200%), and moderately increased fish growth (12%) over our control …
Assemblages Of Grassland Birds As Indicators Of Environmental Condition, Sharon Freshman Browder
Assemblages Of Grassland Birds As Indicators Of Environmental Condition, Sharon Freshman Browder
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Toward A Law Of The Land: The Clean Water Act As A Federal Mandate For The Implementation Of An Ecosystem Approach To Land Mangagement, Jory Ruggiero
Toward A Law Of The Land: The Clean Water Act As A Federal Mandate For The Implementation Of An Ecosystem Approach To Land Mangagement, Jory Ruggiero
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Root-Length Densities Of Lentil And Wheat And Measuring Infiltration In The Soil In Differentsoil Tillage, Lentil-Wheat Versa Fallow-Wheat Rotation Systems Undercentral Anatolian Conditions, Didar Eser, M. Sait Adak, Andreas Biesantz
Root-Length Densities Of Lentil And Wheat And Measuring Infiltration In The Soil In Differentsoil Tillage, Lentil-Wheat Versa Fallow-Wheat Rotation Systems Undercentral Anatolian Conditions, Didar Eser, M. Sait Adak, Andreas Biesantz
Turkish Journal of Agriculture and Forestry
The research was carried out for four years in the two locations Haymana-Ankara and Gözlü-Konya under different climate characteristics of the Central Anatolian Region. The aim of the reseach was to improve soil fertility in dry farming areas and to increase the benefit from fallow areas. Different soil tillage treatments and lentil-wheat versa fallow- wheat rotations systems resp. were examined in these experiments. According to experimental results highest root-length densities (RLD s ) of winter sown lentils were obtained in soil layers of 0-20 and 20-40 cm in comparison to deeper soil layers of 20 cm each down to 1 …
The Role Of Bowfin, Amia Calva, In Multiple Species Management Plans, Benjamin Jacob Hausmann
The Role Of Bowfin, Amia Calva, In Multiple Species Management Plans, Benjamin Jacob Hausmann
Masters Theses
The major challenge to fisheries managers of the 21st century will be to maintain the diversity, not only of fishing opportunity, but also of traditionally non-game and economically unimportant species. With the relatively recent understanding of the importance of ecosystem level management, attention is being focused on native species that were often ignored or eradicated under past management practices. One such fish that has been largely ignored is the bowfin, Amia calva. Ecological data pertaining to bowfin natural history are limited and to date no attempt has been made to integrate bowfin into fisheries management decisions within the species native …
Annual Narrative Report For Turnbull Migratory Wildlife Refuge, 1998, Turnbull National Wildlife Refuge
Annual Narrative Report For Turnbull Migratory Wildlife Refuge, 1998, Turnbull National Wildlife Refuge
Turnbull National Wildlife Refuge Reports
The annual report for Turnbull National Wildlife Refuge.
Sympatric Sea Shells Along The Sea's Shore: The Geography Of Speciation In The Marine Gastropod Tegula, Michael E. Hellberg
Sympatric Sea Shells Along The Sea's Shore: The Geography Of Speciation In The Marine Gastropod Tegula, Michael E. Hellberg
Faculty Publications
Uncertainty and controversy surround the geographical and ecological circumstances that create genetic differences between populations that eventually lead to reproductive isolation. Two aspects of marine organisms further complicate this situation: (1) many species possess planktonic larvae capable of great dispersal; and (2) obvious barriers to movement between populations are rare. Past studies of speciation in the sea have focussed on identifying the effects of past land barriers and on biogeographical breakpoints. However, assessing the role such undeniable barriers actually play in the initial divergence leading to reproductive isolation requires phylogenetic studies of recent radiations living in varying degrees of sympatry …
The Distribution And Long-Term Change In Banksia Ilicifolia Communities On The Gnangara Mound, Ryan Gurner
The Distribution And Long-Term Change In Banksia Ilicifolia Communities On The Gnangara Mound, Ryan Gurner
Theses : Honours
The Gnangara Mound is a large shallow groundwater aquifer which occurs in the superficial formations bounded by the Swan River, Ellenbrook, Gingin Brook, Moore River and the Indian Ocean on the northern Swan Coastal Plain. To protect terrestrial vegetation on the Gnangara Mound. groundwater levels must be maintained to allow plants access to water which is required for their survival. In areas with a shallow depth to groundwater, studies have shown that groundwater drawdown (reduction of the water table by any processes or factors) has a high potential to impact on the vegetation (Havel. 1968: Aplin. 1976: Heddle. 1980a: Dodd …
An Autecological Study On Iris Pseudacorus L. (Iridaceae), Ali Engi̇n, Nezahat Kandemi̇r, Gülcan Şenel, Mustafa Özkan
An Autecological Study On Iris Pseudacorus L. (Iridaceae), Ali Engi̇n, Nezahat Kandemi̇r, Gülcan Şenel, Mustafa Özkan
Turkish Journal of Botany
The ecological properties of Iris pseudacorus L., a marsh plant species, were investigated. The analysis of N%, P% and K% in the below-ground and above-ground parts of the plant was carried out. In addition, soil samples were collected and their physical and chemical aspects were analyzed.
1998 Platte River Basin Ecosystem Symposium Proceedings
1998 Platte River Basin Ecosystem Symposium Proceedings
Water Current Newsletter
No abstract provided.
Movement Patterns Of Fishes In Two Ouachita Highlands Streams : A Test Of The Restricted Movement Paradigm / By Elizabeth B. Smithson, Elizabeth B. Smithson
Movement Patterns Of Fishes In Two Ouachita Highlands Streams : A Test Of The Restricted Movement Paradigm / By Elizabeth B. Smithson, Elizabeth B. Smithson
Electronic Theses and Dissertations
No abstract provided.
The Role Of Good Nutrition. Good Physicians And The Advantages Of Alternative Medicine: An Educational Program For Senior Adults, Violet Connoyer
The Role Of Good Nutrition. Good Physicians And The Advantages Of Alternative Medicine: An Educational Program For Senior Adults, Violet Connoyer
Theses
This study examines previous and forthcoming knowledge of ancient medicinal remedies and solutions which provide and enable]e the acquisition of better and safer health care. Because of political reasons which appear to be dominant over all others, this inherent knowledge continues to seemingly remain obscure within the medical world and within our society. Continued education plays a vital role in the assessment of health care today because statistics stress that too many Eves are daily being snuffed out because of careless and improper drug administration and insidious drug reactions which follow thereafter. As a result, many people are striving to …
What Determines Rates Of Homicide Over Time And Place: Can We Find Out?, Lee N. Robins, Ph.D.
What Determines Rates Of Homicide Over Time And Place: Can We Find Out?, Lee N. Robins, Ph.D.
University of Colorado Law Review
No abstract provided.
The Economic Benefits Of Wilderness: Theory And Practice, Pete Morton
The Economic Benefits Of Wilderness: Theory And Practice, Pete Morton
Denver Law Review
No abstract provided.
Defining Wilderness: From Mccloskey To Legislative, Administrative And Judicial Paradigms, Matthew J. Ochs
Defining Wilderness: From Mccloskey To Legislative, Administrative And Judicial Paradigms, Matthew J. Ochs
Denver Law Review
No abstract provided.
The Completeness Of The Pleistocene Fossil Record: Lmplications For Stratigraphic Adequacy, Benjamin J. Greenstein, John M. Pandolfi, H. Allen Curran
The Completeness Of The Pleistocene Fossil Record: Lmplications For Stratigraphic Adequacy, Benjamin J. Greenstein, John M. Pandolfi, H. Allen Curran
Geosciences: Faculty Publications
Chapter 4 of The Adequacy of the Fossil Record. Edited by S.K. Donovan and C.R.C. Paul
Ecological And Evolutionary Determinants Of Incubation Strategies In Three Sympatric Nuthatches (Sittidae), Cameron K. Ghalambor
Ecological And Evolutionary Determinants Of Incubation Strategies In Three Sympatric Nuthatches (Sittidae), Cameron K. Ghalambor
Graduate Student Theses, Dissertations, & Professional Papers
No abstract provided.
Computer Model For Simulating Almond Moth (Lepidoptera: Pyralidae) Population Dynamics, James E. Throne, David W. Hagstrum, Jan Nawrot
Computer Model For Simulating Almond Moth (Lepidoptera: Pyralidae) Population Dynamics, James E. Throne, David W. Hagstrum, Jan Nawrot
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
We developed a computer model for simulating the population dynamics of the almond moth, Cadra cautella (Walker). The model incorporates previously published life history data for the almond moth developing on stored peanuts, Arachis hypogaea L., including stage-specific immature developmental time and survival and adult longevity and fecundity. The model was modified so that it also could be used to simulate almond moth population dynamics on stored, dried citrus pulp and stored corn (Zea mays L.). We tested the validity of the model by using 4 previously published data sets. The model was useful for interpreting population dynamics observed …