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The Effects Of Photoperiod And Water Temperature On The Reproductive Development Of Black Sea Bass, Centropristis Striata, Katie Strait
The Effects Of Photoperiod And Water Temperature On The Reproductive Development Of Black Sea Bass, Centropristis Striata, Katie Strait
Master's Theses and Capstones
Black sea bass are a potential candidate for marine aquaculture due to their high market value, high demand, and limited seasonal supply. One of the most significant impediments to commercial production of black sea bass is the lack of a year-round supply of eggs and larvae. Further, control of reproductive development is poorly understood in this species. Black sea bass are protogynous hermaphrodites that change sex between 2-5 years of age. It is unclear why adult black sea bass undergo sex change in the wild. Therefore, the first part of study sought to determine if density is involved in sex …
Correlating Sea Otter Density And Behavior To Habitat Attributes In Prince William Sound, Alaska: A Model For Prediction, Heather A. Coletti
Correlating Sea Otter Density And Behavior To Habitat Attributes In Prince William Sound, Alaska: A Model For Prediction, Heather A. Coletti
Master's Theses and Capstones
As a benthic foraging marine mammal, sea otters ( Enhydra lutris) present a unique opportunity for conducting a quantitative assessment of behavior based on habitat use as well as developing a habitat based density model using GIS because of the sea otter's well defined habitat requirements. Several studies have documented sea otter behavior but none have calculated the probability of occurrence of a particular behavior based on habitat attributes. Previous predictive models of sea otter density have been constructed, however these models have excluded offshore habitat. Seven aerial surveys, that included offshore habitats, were conducted between 1995 and 2005 in …
Toxin-Producing Microcystis Aeruginosa: A Trade-Off In The Vertical Distribution Of Three Daphnia Species As Predicted By The Ideal Free Distribution With Costs Model, Sonya Claudine Carlson
Toxin-Producing Microcystis Aeruginosa: A Trade-Off In The Vertical Distribution Of Three Daphnia Species As Predicted By The Ideal Free Distribution With Costs Model, Sonya Claudine Carlson
Master's Theses and Capstones
Daphnia hyalina, D. galeata, and D. ambigua were exposed to the cyanobacterium Microcystis aeruginosa in 30 cm temperature-stratified columns. Changes in egg ratio, lipid index, length, and growth were recorded over 3 day experiments. Spatial distributions were recorded during 6-hour constant light experiments and 3 day fluctuating light experiments. D. hyalina and D. galeata stayed in the upper half of the column in temperatures of 18--22°C when exposed to M. aeruginosa. D. ambigua remained between 10--19°C regardless of food type. For across all experiments, depth and temperature ranges were narrowest in treatments with M. aeruginosa. D. ambigua incurred costs to …
Native Gastropods And Introduced Crabs: Shell Morphology And Resistance To Predation In The New England Rocky Intertidal Zone, Sarah Joanne Teck
Native Gastropods And Introduced Crabs: Shell Morphology And Resistance To Predation In The New England Rocky Intertidal Zone, Sarah Joanne Teck
Master's Theses and Capstones
The impact of non-native species is one of the most critical issues facing management and conservation today. When these invaders are generalist predators, their impacts on native communities can be a major restructuring force for ecosystems. A new voracious predator the Asian crab, Hemigrapsus sanguineus , joins another non-native established species, Carcinus maenas, along the majority of the New England coastline. What remains poorly understood is how the two introduced predators may modify local communities, especially considering their impact on native prey, such as the rough periwinkle snail, Littorina saxatilis. The goal of this research is to investigate the vulnerability …
Environmental Effects On Early Life Stages Of American Shad (Alosa Sapidissima) And Rainbow Smelt (Osmerus Mordax ), Kristen Fuda
Environmental Effects On Early Life Stages Of American Shad (Alosa Sapidissima) And Rainbow Smelt (Osmerus Mordax ), Kristen Fuda
Master's Theses and Capstones
Recruitment of American shad (Alosa sapidissima) and rainbow smelt (Osmerus mordax) has steadily declined over the last few decades, possibly due to the construction of physical impediments to migration and increases in anthropogenic pollution. In order to elucidate environmental parameters influencing early life stages of anadromous fish, both laboratory and field studies were conducted. The effects of abiotic factors, including dissolved oxygen (DO), pH, salinity, nitrate, and phosphate, on hatch and survival of larval and juvenile American shad and rainbow smelt were examined in laboratory studies. Field studies on shad emigration were conducted in the Exeter River, and studies on …