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Adaptation Of Striped Bass To Sea Water Following Direct Transfer From Freshwater: Morphological, Biochemical, And Physiological Parameters, Judy A. King
Electronic Theses and Dissertations
There has been heightened interest in the biology of striped bass (Morone saxatilis) because of increased pollution in their native spawning grounds and because of their extensive use in landlocked sport fisheries. Their euryhalinity makes them an excellent species for osmoregulation studies. The objective of this research was to study the rate of adaptation of striped bass gills to sea water (3% salt) after direct transfer from freshwater using biochemical (ion transport enzyme levels), physiological (chloride efflux), and ultrastructural methods. Striped bass have specialized osmoregulatory cells located on the interlamellar and afferent surfaces of their gill filaments as shown by …
Salinity Effects On The Development And Larval Tolerance Of Five Species Of Echinoderms., Richard Allen Roller
Salinity Effects On The Development And Larval Tolerance Of Five Species Of Echinoderms., Richard Allen Roller
LSU Historical Dissertations and Theses
Salinity effects on the developmental rates, larval tolerances and various metabolic processes of five species of echinoderms were investigated. Development of Lytechinus variegatus (Lamarck), Strongylocentrotus droebachiensis (O. F. Muller, 1776), Strongylocentrotus purpuratus (Stimpson, 1857), Strongylocentrotus pallidus (G. O. Sars, 1871), and Pisaster ochraceus (Brandt, 1835) larvae were observed. Developmental rates and larval survival to metamorphosis of S. droebachiensis and S. pallidus varied directly with salinity and were well within the observed salinity tolerance and distributional limits for the adults. For each species, embryos and larvae at lower salinities (20, 22.5, and $25\sp{o}\!/\!\sb{oo})$ tended to develop more slowly than those at …
Parasites Of The Yellowtail Flounder (Limanda Ferruginea, Storer, 1839) From The Western North Atlantic, Salvatore Anthony Testaverde
Parasites Of The Yellowtail Flounder (Limanda Ferruginea, Storer, 1839) From The Western North Atlantic, Salvatore Anthony Testaverde
Doctoral Dissertations
A study was conducted of parasites from the yellowtail flounder, Limanda ferruginea (Storer, 1839) taken from the western North Atlantic, United States. Monthly studies, from the Cape Ann, Massachusetts area, April 1977 to 1979, were initiated to determine prevalence, mean intensity, and range of parasites in relation to host and environmental factors. A second study was conducted to determine parasite-mix between the Cape Cod and the Georges Bank subareas, including preliminary findings from the southern New England and the Middle Atlantic subareas. From 40 previously reported parasites, including adults, metacercariae, plerocercoids, and juvenile forms, a total of 15 species of …
Geographic Variation In Morphology And Allozymes Within Tree Squirrels, Sciurus Niger And S. Carolinensis, Of The Lower Mississippi River Valley., Nancy D. Moncrief
Geographic Variation In Morphology And Allozymes Within Tree Squirrels, Sciurus Niger And S. Carolinensis, Of The Lower Mississippi River Valley., Nancy D. Moncrief
LSU Historical Dissertations and Theses
Geographic variation was studied in fox squirrels, Sciurus niger, and gray squirrels, S. carolinensis, by comparing patterns of differentiation within and between these two sympatric species. Patterns of variation were examined in light of the lower Mississippi River as a potential barrier to dispersal and gene flow in these squirrels. Differences within and between species were analyzed using morphologic (15 cranial and mandibular measurements) and allozymic (35 presumptive gene loci) characters. Geographic patterns of variation among populations were apparent in the morphology and allozymes of both species; patterns of differentiation in morphologic and allozymic characters are similar between species; however, …
Effects Of Riverine Barriers On Genetic Differentiation Of Amazonian Forest Undergrowth Birds (Peru)., Angelo Paul Capparella
Effects Of Riverine Barriers On Genetic Differentiation Of Amazonian Forest Undergrowth Birds (Peru)., Angelo Paul Capparella
LSU Historical Dissertations and Theses
The high frequency with which rivers delimit phenotypically differentiated bird taxa is unique to Amazonia, where major rivers often form the boundaries between allospecies and subspecies pairs of understory terra firme forest birds. In contrast, many such forest species with life history traits similar to these differentiated forms show no variation in plumage across even the largest rivers. To determine whether such species are nonetheless genetically differentiated, I obtained tissue samples from populations of forest understory birds from opposite banks of the Napo and Amazon rivers of northeastern Peru. These included three species that are not phenotypically differentiated across the …
Life History Strategies Of A North Temperate Salmonid, Salvelinus Fontinalis, In Polar Bear Provincial Park, Ontario, Peter Owen Steele
Life History Strategies Of A North Temperate Salmonid, Salvelinus Fontinalis, In Polar Bear Provincial Park, Ontario, Peter Owen Steele
Digitized Theses
A northern anadromous population of brook trout (Salvelinus fontinalis), from the Sutton river, in the Ontario Hudson Bay Lowlands, was examined to determine if its life history differed from that reported for the species elsewhere. The Sutton River population was similar to historical anadromous populations native to North America 200 years ago. Only minor differences were discernible between the life histories of brook trout from Sutton River, Ontario, Nelson-Hayes River, Manitoba, and Richmond Gulf, Quebec. All of these populations differed from populations in Canadian Maritime Provinces, in that the northern trout migrated to saline water earlier, matured later and at …
Seasonal Reproduction And Group Dynamics Of Bushy-Tailed Woodrats, Neotoma Cinerea, Graham John Hickling
Seasonal Reproduction And Group Dynamics Of Bushy-Tailed Woodrats, Neotoma Cinerea, Graham John Hickling
Digitized Theses
It has been proposed that bushy-tailed woodrats (Neotoma cinerea) exhibit a harem-polygynous social system (Escherich 1981). I monitored 16 groups of N. cinerea in rocky habitat in the Kananaskis Valley, Alberta, from 1984 through 1986 to determine whether reproduction, growth, group size, and group sex ratio of this species were proximately limited by food abundance. Supplemental food was supplied to 8 groups through 2 successive breeding seasons, and the fed and unmanipulated groups were monitored using mark-recapture techniques. N. cinerea first bred as yearlings, with females producing 1 or 2 litters each season. Food addition resulted in early breeding (p …
Variation In The Shell Morphology And Growth Rate Of Lampsilis Radiata, A Freshwater Mussel, Robert Charles Bailey
Variation In The Shell Morphology And Growth Rate Of Lampsilis Radiata, A Freshwater Mussel, Robert Charles Bailey
Digitized Theses
I measured a correlation between the habitat of a freshwater mussel, Lampsilis radiata siliquoidea (Barnes 1823), and its shell morphology and growth rate. I then tried to determine the source of morphological and growth rate variation (environmental or genetic), and whether or not the phenotype/habitat correlation was due to differential adaptation.;Morphometric and annual ring analysis of mussels from Inner Long Point Bay, Lake Erie indicated that L. radiata from more exposed, sandier areas of the bay were faster growing and had thicker shells than those from less exposed, muddy areas. Variation among exposure areas in allozyme phenotypes of two gene …
Population Characteristics Of The Crayfish, Cambarus Bartoni, In Lakes With And Lakes Without Introduced Populations Of Smallmouth Bass, Micropterus Dolomieui, In Algonquin Provincial Park, Ontario, Keith Marquis Somers
Population Characteristics Of The Crayfish, Cambarus Bartoni, In Lakes With And Lakes Without Introduced Populations Of Smallmouth Bass, Micropterus Dolomieui, In Algonquin Provincial Park, Ontario, Keith Marquis Somers
Digitized Theses
Populations of the crayfish Cambarus bartoni from six lakes in Algonquin Provincial Park, Ontario were compared to evaluate the influence of an introduced predator, the smallmouth bass Micropterus dolomieui. Bass were introduced into lakes in the southern portion of the park in the late 1800's and early 1900's. Crayfish populations from three lakes containing bass were contrasted with populations from three lakes without bass.;Comparisons of relative abundances, patterns of habitat use and length-frequency distributions were compromised by seasonal changes in crayfish trappability and differences in crayfish species composition. Catches of C. bartoni in baited traps were lower in lakes containing …