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An Exploration Of The Drivers Of Intraspecific Variation In Arthropod Phenotypes, Jamie Phelps

LSU Doctoral Dissertations

Herein we explore the various forces that drive phenotypic variation in arthropods focusing on spatial and temporal differences as well as sexual dimorphism. We use both marine, Tigriopus californicus, and terrestrial, Melitaeini, organisms to investigate these forces.

Tigriopus californicus and Heat Hardening: The study explores how Tigriopus californicus, a copepod, adapts to thermal variation along the North American Pacific Coast. Researchers investigated intraspecific variation in heat hardening, measuring differences in upper lethal limits (ULLs) and potential fecundity costs across five populations. We found a cost of heat hardening: the size of the first brood produced after heat shock …

Symbiotic Associations Between Vibrio Cholerae And Copepods And Their Potential Public Health Impact, Gretchen Boria Pérez

Legacy Theses & Dissertations (2009 - 2024)

Vibrio cholerae O1 concentrate in copepods by attaching to their chitinous exoskeleton and gut, making these planktonic crustaceans participants in the spread of cholera in marine and estuarine environments. The role of the symbiosis in the spread of gastrointestinal disease caused by non-O1 serotypes has not been well-studied in fresh water systems. The goal of these studies was to determine whether symbiotic association of V. cholerae with copepods affects virulence of hemolysin/cytolysin toxin, suspected in V. cholerae non-O1 related morbidity. The reverse-transcription-polymerase chain reaction was used to evaluate the relative transcriptional response of hlyA, encoding hemolysin, by a non-O1 strain …

A Comparison Of Copepoda (Order: Calanoida, Cyclopoida, Poecilostomatoida) Density In The Florida Current Off Fort Lauderdale, Florida, Jessica L. Bostock

HCNSO Student Theses and Dissertations

Copepods, minute crustaceans, are vital constituents of marine food web dynamics in tropical ecosystems. Ecologically, copepods provide the link between primary production and tertiary consumers. Changes in population structure and densities may impact ecosystem stability and production on small to large spatial scales. The present study examined the influence of the Florida Current on copepod population densities off the coast of Fort Lauderdale, Florida due to limited data in the area. Samples were collected during February and July 2007 at two locations, Stations A and B. Station A, dependent on current dynamics, fluctuated between the most western boundary and the …

The Effects Of Dredged Materials On The Copeod, Acartia Tonsa, Renee Suzanne Crouch

Biological Sciences Theses & Dissertations

A study was conducted to determine the potential impact of open ocean disposal of sediments dredged from a highly industrialized seaport. Sediments from three potential dredge sites along the Southern Branch of the Elizabeth River, Hampton Roads, Virginia were evaluated for acute toxicity. The suspended particulate fractions of dredged materials were tested in a series of 96-hour, static bioassays using the calanoid copepod, Acartia tonsa Dana. Significant mortalities were observed for all three sites with the sediments from the most heavily industrialized site producing immediate and severe mortality. Analysis of results indicates that mortality was highly related to the volatile …

The Ecology Of Some Harpacticoid Copepods Of A California Sand Flat, David R. Williams

University of the Pacific Theses and Dissertations

The main purpose of this study is to describe the population ecology of eight species of harpacticoid copepods over a period of one year with emphasis on the effects of physical interactions and biotic factors on these populations. The species were: Amphiascopsis sintus (Claus) 1866, Stenhelia (D.) oblonga Lang, 1965, Heterolaphote variables Lang, 1965, Ectinosoma melaniceps Boek ? var. T. Scott, 1902, Paralophonte subterraneas Lang, 1965, Tisbe furcata (Baird) 1837, Diasaccus spinatus Cambell, 1929 and Parathelestris bulbiseta Cambell?.

Correlations Of Some Physico-Chemical Factors With Cladocerans, Copepods, And Rotifers In Fourteenmile Slough, Stockton, California, John Kenneth Frey

University of the Pacific Theses and Dissertations

The purpose of this study was to examine correlations between physico-chemical factors; between factors and particular species of zooplankton; between species of zooplankton; and between different locations in a dead-end slough. Fourteenmile Slough, located in northwest Stockton, California) was chosen as the location for this study.

Ascidicolous Copepods Of Dillon Beach, California, David Horace Montgomery

University of the Pacific Theses and Dissertations

Work on the copepoda parasitizing anoidiens has been relatively extensive in Europe, loss so on the East Coast of the United States and negligible on the West Coast. of this work, a major portion has been concerned with the solitary ascidians, while the colonial or compound forms have been largely neglected. The apparent lack of interest in copepods parasitizing compound be attributed to the manliness of the animals, their associations with both Zooids and the colonial matrix which makes dissection difficult and the chaotic condition of their taxonomy.

Studies On The Microcrustacea Of Three Montane Lakes In Glacier National Park, Montana, Robert O. Megard

Biology ETDs

Grinnell Lake, Lake Josephine, and Swiftcurrent Lake, at an elevation of approximately 5,000 feet in northwestern Montana, are comparable with lakes in the montane zone defined by Pennak for lakes at elevations between 8,200 feet and 10,500 feet in the Rocky Mountains of northern Colorado. Five species of Copepoda, six Cladocera, and four Ostracoda were collected in the lakes studied. The population of microcrustacea in these lakes was most dense in or slightly above the masses of rooted aquatic vegetation growing to a height of six to 10 inches above the bottom wherever the water was between three feet and …