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Natural mortality and movement of juvenile cod (Gadus spp.) inhabiting eelgrass (Zostera marina) in coastal Newfoundland waters /Sheppard, G. Lee, January 2005 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2005. / Includes bibliographical references.
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Algal community structure and organization in high intertidal rockpoolsvan Tamelen, Peter G. 17 March 1992 (has links)
Gradients of physical disturbance are central to
theories of community organization yet rarely are studies
performed in which physical factors are experimentally
manipulated. Pothole tidepool algal communities exhibit
distinct zonation patterns from top to bottom that result
from scouring by rocks and other debris in the pools.
Scouring is easily manipulated by removing or adding rocks
to tidepools. Thus, the gradient of physical disturbance
potentially causing community patterns can be manipulated
to test theories of community organization.
I documented the distribution pattern of algae
inhabiting pothole tidepools and measured a number of
physical factors which were hypothesized to be responsible
for the observed zonation patterns. Then, I experimentally
evaluated the roles of physical disturbance, herbivory, and
competition in these tidepool communities. I found that
scouring by rocks was primarily responsible for the
observed zonation patterns in pothole tidepools. However,
not all pools are potholes. Evaluation of the physical
properties effecting the cobble-retaining ability of
tidepools enabled prediction over a broad geographic range
of pools likely to have cobbles and thus show typical
pothole algal zonation patterns.
Coralline algae (Rhodophyta, Corallinaceae) are a
dominant feature of tidepools as well as many low
intertidal and subtidal habitats. I evaluated the relative
resistance of coralline algae (both articulated and
crustose forms) and other common tidepool algae to scouring
by rocks. Coralline crusts were highly resistant to
scouring while articulated coralline algae are very
susceptible to scouring. Erect fleshy algal species showed
intermediate resistance to scouring. This corresponds well
to observed algal zonation patterns in intertidal potholes.
Based on this information, I proposed that wave-induced
scouring may have been the selective force for the initial
incorporation of calcium carbonate into algal thalli. / Graduation date: 1992
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Growth of juvenile Pacific oysters, Crassostrea gigas (Thunberg) and Manila clams, Tapes japonica (Deshayes) in effluent from salmon-macroalga polyculture systemDiaz, Maria Elena, 1958- 03 March 1992 (has links)
Experiments were carried out in fall and winter, 1990
and spring and summer, 1991 , to determine growth and
mortality of juvenile Pacific oysters {Crassostrea gigas)
in effluent from cultured coho salmon {Oncorhynchus
kisutch) , and effluent from salmon in which the red
macroalga Palmaria mollis was cultured. Ambient sea water
from Yaquina Bay was used as a control. Juvenile Manila
clams {Tapes japonica) were also tested in summer, to
compare the growth response of clams with that of Pacific
oysters. Measured growth parameters included: increase in
mean individual live weight, specific growth rate (%
increase of mean live weight per day) and mean individual
organic (ash-free) weight. Temperature, chlorophyll a,
phaeopigment, carbon and nitrogen concentrations and C/N
ratio for all treatments were also recorded during spring
and summer, 1991.
The oysters grew significantly faster in effluent
from salmon and salmon conditioned by macroalgae than in
the control during the Fall Experiment (September 7-
0ctober 31, 1990). Mean water temperature was 13-16°C.
Growth rates were significantly greater in oysters
cultured in salmon effluent than in the control during the
Winter Experiment (December 7, 1990-February 15, 1991).
However, growth was very poor due to low water
temperatures (7-10°C).
Growth of oysters was significantly greater in the
control than in effluent from salmon and salmon
conditioned by macrolagae in the Spring Experiment (March
7-May 24, 1991). Mean water temperature was 12°C. In the
Summer Experiments, (June 3-July 4 and July 19-August 17,
1991) growth of oysters was more rapid in treatments with
macroalgae as compared to treatments without macroalgae
Comparative experiments with juvenile Manila clams gave
similar results.
Percentage mortality for both oysters and clams
ranged from 0 to 5% and was highest during winter and
lowest during summer. Mean chlorophyll values ranged from
1 μg/1 in spring, 1991 to 11 μg/1 summer, 1991. / Graduation date: 1992
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Kuzeydoğu Akdeniz kıyıları (Gazipaşa - İskenderun)'nın makrobentik deniz florasının belirlenmesi /Özvarol, Yaşar. Ertan, Ömer Osman. Turna, İsmail İbrahim. January 2009 (has links) (PDF)
Tez (Doktora) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Su Ürünleri Temel Bilimleri, 2009. / Kaynakça var.
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Endolithic algae in Barbados reef coralsRoberts, Madeleine. January 1980 (has links)
No description available.
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The influence of intertidal macroalgae on exchanges of nutrients and oxygen in a Pacific Northwest estuaryCollins, John L. (John Leopold), 1948- 19 June 1986 (has links)
Graduation date: 1987
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The ecology of chemical defence in a filamentous marine red algaPaul, Nicholas Andrew, School of Biological, Earth & Environmental Sciences, UNSW January 2006 (has links)
I investigated the ecological functions of halogenated secondary metabolites from the red alga Asparagopsis armata, their localisation in specialised cells and also their cost of production. A. armata produces large amounts of halogenated metabolites ( < 20 ??g / mg dry weight) that are sequestered in gland cells, as was demonstrated with light, epifluorescence and transmission electron microscopy. Cellular structures were identified that likely assist the release of metabolites from the gland cells to the algal surface. The halogenated metabolites of A. armata have multiple ecological roles, functioning as both inhibitors of bacterial fouling and as herbivore deterrents. Their activity against bacteria and herbivores was measured by a novel test in which the metabolites were manipulated in A. armata by omitting bromide ions from the culture media. This technique prevented the production of halogenated metabolites, but did not impact on other aspects of algal biology. Algae lacking halogenated metabolites (bromide [-] algae) had higher densities of epiphytic bacteria than those that continued to produce metabolites (bromide [+] algae). Bioassays with pure compounds against individual bacterial isolates further supported an inhibitory role for the halogenated metabolites against epiphytic bacteria, and also indicated an affect on bacterial community structure as well as abundance. Bromide (+) A. armata produced halogenated metabolites that also deterred feeding by two herbivores (an amphipod and an abalone), but not a third (an opisthobranch mollusc). A novel outcome from these feeding assays was the demonstration of a relationship between herbivore size and consumption of the chemically defended A. armata by the abalone Haliotis rubra. In addition to the fitness benefits gained from chemical defence, there were also costs for allocating resources to secondary metabolites. These costs were only detected under limiting light resources, consistent with predictions of the plant defence models. The integration of chemical analyses and cellular measures of chemical defence proved essential in elucidating resource allocation to chemical defence in the filamentous stage of A. armata. This thesis highlights that the simple relationships between growth and defence in filamentous algae can provide an excellent model for studies of the ecology and evolution of chemical defences in marine algae.
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The taxonomy, morphology and reproduction of the Myrionemaceae, Elachistaceae, Corynophlaeceae and Giraudyaceae (Phaeophyceae) in Southern Australian / Stephen SkinnerSkinner, Stephen January 1980 (has links)
Typescript (photocopy) / vii, 228 leaves, [43] leaves of plates : ill. ; 31 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1981
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Community structure and diets of fishes associated with pelagic Sargassum and open-water habitats off North CarolinaCasazza, Tara L. January 2008 (has links) (PDF)
Thesis (M.S.)--University of North Carolina Wilmington, 2008. / Title from PDF title page (viewed May 27, 2009) Includes bibliographical references (p. 132-135)
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Effects of CO2-induced acidification on the intertidal sea anemone Anthopleura elegantissima (Cnidaria: anthoza) and its algal symbiont Symbiodinium muscatinei (Dinomastigota: dinophyceae)Towanda, Trisha. January 1900 (has links) (PDF)
Thesis (M.E.S.)--Evergreen State College, 2008. / "December, 2008." Title from title screen (viewed 4/8/2010). Includes bibliographical references (leaves 22-28).
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