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Articles 331 - 350 of 350
Full-Text Articles in Systems Biology
Top-Down Cascade From A Bitrophic Predator In An Old-Field Community, Matthew D. Moran, Thomas P. Rooney, L. E. Hurd
Top-Down Cascade From A Bitrophic Predator In An Old-Field Community, Matthew D. Moran, Thomas P. Rooney, L. E. Hurd
Biological Sciences Faculty Publications
We tested the hypothesis that a bitrophic (third and fourth level) arthropod predator can exert a cascading, top-down influence on other arthropods and plants in an early successional old field. First-stadium mantids, Tenodera sinensis, were added to replicated open-field plots in numbers corresponding to naturally occurring egg hatch density and allowed to remain for ≈ 2 mo. Sticky-trap dispersal barriers around both control and mantid-addition plots allowed us to monitor emigration of arthropods continuously during the experiment. Biomass of herbivores, carnivores, and plants, and abundances of arthropod taxa within plots were determined at the beginning, middle, and end of …
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
Benthic-Pelagic Links: Responses Of Benthos To Water-Column Nutrient Enrichment, S. C. Blumenshine, Yvonne Vadeboncoeur, D. M. Lodge, K. L. Cottingham, S. E. Knight
Benthic-Pelagic Links: Responses Of Benthos To Water-Column Nutrient Enrichment, S. C. Blumenshine, Yvonne Vadeboncoeur, D. M. Lodge, K. L. Cottingham, S. E. Knight
Biological Sciences Faculty Publications
Although the responses of pelagic algae and invertebrates to gradients of nutrient enrichment are well known, less is known about the responses of benthos to such gradients or how benthic and pelagic responses may interact. We performed a 9-wk experiment in 2000-L mesocosms in the field to test for the effect of water-column nutrient enrichment on phytoplankton, algae on sediments (epipelon) and hard surfaces (plastic strips), as well as pelagic and benthic primary consumers. The experimental design consisted of 4 nutrient enrichment rates (0, 0.5, 1.0 and 2.0 μg P L-1 d-1, together with N to yield …
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
Longitudinal Dynamics Of Seston Concentration And Composition In A Lake Outlet Stream, Yvonne Vadeboncoeur
Longitudinal Dynamics Of Seston Concentration And Composition In A Lake Outlet Stream, Yvonne Vadeboncoeur
Biological Sciences Faculty Publications
Concentrations of suspended particulate organic carbon (POC), dissolved organic carbon, bacteria, and chlorophyll a were measured in a lake outlet in western Montana, USA. Seven sites within the first 3 km downstream from the lake were sampled over 14 mo. Downstream change in concentration of each variable was tested for fit to a power function (C=aDb). Downstream changes in POC, bacteria, and chlorophyll a, sometimes fit a power function, and the value of the exponent b was positively correlated with discharge. At low discharge, a downstream decline in lake algae was accompanied by an increase in stream algae. …
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
Micronuclear Genome Organization In Euplotes Crassus: A Transposonlike Element Is Removed During Macronuclear Development, Scott Everet Baird, Gina M. Fino, Susan L. Tausta, Lawrence A. Klobutcher
Micronuclear Genome Organization In Euplotes Crassus: A Transposonlike Element Is Removed During Macronuclear Development, Scott Everet Baird, Gina M. Fino, Susan L. Tausta, Lawrence A. Klobutcher
Biological Sciences Faculty Publications
After mating, hypotrichous ciliated protozoa transform a set of their micronuclear chromosomes into thousands of short, linear DNA molecules that form the macronuclear genome. To examine micronuclear genome organization in the hypotrich Euplotes crassus, we have analyzed two cloned segments of micronuclear DNA as well as the macronuclear DNA molecules that are derived from them. E. crassus was found to display a number of features characteristic of other hypotrich genomes, including (i) clustering and close spacing of the precursors of macronuclear DNA molecules, (ii) the frequent occurrence of internal eliminated sequences within macronuclear precursors, (iii) overlapping macronuclear precursors, (iv) lack …
Characterization Of Chromosome Fragmentation In Two Protozoans And Identification Of A Candidate Fragmentation Sequence In Euplotes Crassus, Scott Everet Baird, Lawrence A. Klobutcher
Characterization Of Chromosome Fragmentation In Two Protozoans And Identification Of A Candidate Fragmentation Sequence In Euplotes Crassus, Scott Everet Baird, Lawrence A. Klobutcher
Biological Sciences Faculty Publications
Following the sexual cycle, hypotrichous ciliated protozoans fragment a set of their micronuclear chromosomes to generate the thousands of short, linear DNA molecules present in the transcriptionally active macronucleus. We have used a hybrid selection procedure to examine macronuclear DNA molecules for subtelomeric length heterogeneity to determine whether chromosome fragmentation occurs at unique or multiple sites. The results suggest that multiple, but closely spaced, chromosome fragmentation sites are used by Oxytricha nova. In contrast, Euplotes crassus uses unique chromosome fragmentation sites in a reproducible manner to generate the ends of macronuclear DNA molecules. Additional studies compared DNA sequences in …
Density, Length Frequency Distribution, Growth Rate, And Condition Of The Freshwater Mussel, ̲A̲N̲Od̲O̲N̲T̲A ̲I̲M̲B̲E̲C̲I̲L̲L̲I̲S Say 1829, In Six Ponds At The Clifton F. Mcclintic Public Hunting And Fishing Area, Mason County, West Virginia, Jeff L. Harmon
Theses, Dissertations and Capstones
Populations of the freshwater mussel Anodonta imbecillis Say 1829, were sampled from six ponds at the Clifton F. McClintic Public Hunting and Fishing Area in Mason County West Virginia from April 1986 to May 1987. One of the six ponds, pond 12, is contaminated with byproducts from the manufacture of TNT which occurred at the site during World War II. Population density, length frequency distribution, growth rates and condition indices were examined for each population to establish baseline data for the species and to determine what effects the contaminants might be having on these organisms.
Population densities ranged from 4.8 …
On The Phylogenetic Relationships Among Paenungulata And Within Elephantidae As Demonstrated By Molecular And Osteological Evidence, Jeheskel Shoshani
On The Phylogenetic Relationships Among Paenungulata And Within Elephantidae As Demonstrated By Molecular And Osteological Evidence, Jeheskel Shoshani
Wayne State University Dissertations
Paenungulata (=PAEN). A total of 182 non-dental morphological characters from 100 species (79 extant, 21 extinct; 98 mammals and 2 non-mammals) was analyzed by two maximum parsimony tree building algorithms. Parallel analyses of 2,258 pairwise immunodiffusion (IMDFN) comparisons with 16 chicken antisera on 101 mammalian species (representing 22 taxa) and of amino acid sequence data of alpha and beta hemoglobins and other published protein sequences were also conducted. Morphological and molecular results agree that Eutheria consists of five major clades and that rates of evolution are similar in the two approaches. Following are close relationships based on osteological results: (1) …
Food Habits Of Dicamptodon Ensatus And Associated Fish Species Of Maratta Creek, Washington, Authur L. Antonelli
Food Habits Of Dicamptodon Ensatus And Associated Fish Species Of Maratta Creek, Washington, Authur L. Antonelli
All Master's Theses
Three cold-blooded vertebrates, Dicamptodon ensatus, Cottus tenuis, and Salmo gairdneri were investigated as to food habits for a period of one year. The existence of competition between these animals for food was determined by means of stomach analysis. The results were compared relative to each vertebrate and the bottom fauna procurred from the stream. It was shown that the food habits of D. ensatus and S. gairdneri were diverse enough to warrant partial exclusion on the basis of food. C. tenuis demonstrated selectivity and was shown to be under competitive stress from the other two species.
A Histological And Functional Study Of The Skin Of The Frog, Oscar Stern
A Histological And Functional Study Of The Skin Of The Frog, Oscar Stern
Bachelors’ Theses
In recent years much has been written on the skin of the frog, however, it seems that little has been done to correlate the morphological and physiological aspects of the skin. The literature reveals that considerable work has been done on the common laboratory frog Rana pipiens.