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Characterization of the matrix proteins of the fish rhabdovirus, infectious hematopoietic necrosis virusOrmonde, Patricia A. 14 April 1995 (has links)
Graduation date: 1995
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Ecological consequences and evolutionary implications of group foraging by coral reef fishes /Foster, Susan Adlai. January 1984 (has links)
Thesis (Ph. D.)--University of Washington, 1984. / Vita. Bibliography: leaves [129]-141.
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Age compositions, growth rates, reproductive biology, and diets of the black bream Acanthopagrus butcheri in four estuaries and a coastal saline lake in south-western AustraliaSarre, Gavin Ayrton. January 1999 (has links)
Thesis (Ph. D.)--Murdoch University, 1999. / Includes bibliographical references (leaves 116-130).
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Characterization of a rhabdovirus isolated from the snakehead fish (Ophicephalus striatus)Kasornchandra, Jiraporn 02 December 1991 (has links)
Graduation date: 1992
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The relationship between the gut and the water-electrolyte balance of a marine teleost, Enophrys bison (Girard)Sleet, Randolph Bullock 15 June 1981 (has links)
In higher vertebrates, normal digestion and absorption by the
gastrointestinal tract are dependent on the orderly and controlled
transit of intraluminal contents. A relationship between fluid
passage through the gut and absorption from the gut has yet to be
examined in fish. In marine teleosts, the osmolality and ion concentration
of the ingested seawater (SW) must be lowered before
water absorption is initiated. By assuming that these processes are
related to fluid transit, it is likely that alterations in these
processes as well as in the water-electrolyte balance (WEB) of the
animal would result with changes in the transit of intraluminal fluid.
I hypothesized that marine teleosts regulate gut motility to achieve
essential water absorption and thereby maintain the WEB. To test
this, the gut of a marine teleost, the buffalo sculpin (Enophrys
bison G.), was challenged in situ with forced drinking (continuous
perfusion) at rates above and below that of the measured drinking
rate (DR).
Initially, the sensitivity of the WEB of the sculpin to
preparatory manipulations that were essential for testing the above
proposal was determined. The WEB was monitored before, during and
after manipulation that included handling, containment, benzocaine-induced
anesthesia, arterial and esophageal cannulation and serial
sampling of blood. To monitor the WEB, indicators of the osmotic
status and the intravascular volume were measured. Within one to
three hours after surgery, a hyper-osmotic hemodilution resulted from
an influx of hyper-osmotic fluid. Blood volume increased about 18%
after surgery. The osmotic imbalance was corrected within 24 hours
after surgery, whereas, the volume disturbance persisted. The occurrence
of plasma hyper-osmolality after surgery was inhibited with
esophageal occlusion. This implicated the gut as the origin of the
osmotic and volume disturbances. Further data evaluation suggested
that the surgery-induced WEB disturbance was a resultant of enhanced
ion and water absorption in the upper and lower gut.
Next, the DR and drinking behavior of the buffalo sculpin were
determined. Also assessed was the influence of the manner of SW
ingestion (ab libitum drinking or forced drinking) and of the rate
of ingestion on SW modification by the gut. DR was variable within
as well as among experimental groups. DR appeared to increase with
the animal's capture duration suggesting that water permeability of
the sculpin was gradually increasing after capture. The fluid
volume and resident duration, and water modification in the upper gut
and lower gut were consistent over a broad range of DRs. This demonstrated
that the sculpin were ingesting SW frequently, perhaps in a
manner similar to sipping. In respect to estimates made in sculpin
allowed to drink ab libitum, forced drinking had a negative effect
on desalting.
Finally, a relationship was looked for between gut motility and
the WEB of the sculpin. Several indicators of gut motility, water
absorption, and the WEB were monitored while the gut was perfused at
several different rates. If gut motility is regulated to achieve
essential water absorption, then changes in gut motility would result
in response to alterations in the forced drinking rate, so that
adequate water modification and absorption would be accomplished
and the WEB maintained. Over the levels of perfusion administered,
the WEB was not maintained. With the elevation in perfusion rate,
the intravascular volume increased and yet intestinal water absorption
was maintained or gradually increased. It appears that under the
circumstance of enhanced SW ingestion, the mechanisms regulating gut
motility and water absorption are not integrated with mechanisms
maintaining the WEB of the buffalo sculpin. It remains unclear if,
without SW ingestion, gut motility and the WEB are actively related. / Graduation date: 1982
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Convergent Evolution in Livebearing FishesTroendle, Nicholas 2012 May 1900 (has links)
The directionality and consistency of evolution has long been a subject of contention among evolutionary biologists since the days of Darwin. However, it is unknown how much can be quantified and how much results from more complex variables. It is also unknown whether evolution is consistent or whether it occurs differently in each system.
My study focuses on predation and habitat as ecological gradients that may create convergent evolution in livebearing fishes. In Chapter I, I focus on predation as a mechanism for driving convergent evolution in Gambusia affinis. A suite of 7 microsatellite markers was used in order to determine independence of morphological evolution. Mantel tests were used to compare genetic, phenotypic, geographical and environmental distances among the six focal populations. These tests showed that there was a significant correlation between genetic and geographic distance but no significant correlation between genetic and phenotypic distances, which may indicate that phenotypic divergence has arisen independently in multiple instances.
The second chapter focuses on a unique form of convergence that arose during speciation of three livebearing fishes, which we termed "convergent speciation." I focus on habitat type as a selective pressure in the lake system of Lake Catemaco, Mexico and the surrounding rivers. Lake Catemaco has been isolated from the surrounding rivers for approximately 1.2 million years and during that time several endemic species have evolved in the lake. This provides an excellent study system for studying convergent divergence. To test the theory of convergent speciation in this system, a MANOVA was conducted. The effect of habitat was an important source of variance in the system, indicating that habitat is a likely driving force responsible for convergent speciation in the system. Using discriminant functions I was able to correctly predict the habitat of fish of six different species between 68% and 71% of the time. This may indicate that evolutionary response to habitat is consistent across taxa (i.e., convergent divergence is taking place).
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Fish ecomorphology predicting habitat preferences of stream fishes from their body shape /Chan, Matthew D. January 2001 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 2001. / Title from PDF title page (viewed Apr. 2, 2005). Vita. Includes bibliographical references (p. 127-141).
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Mechanism underlying the maturation of AMPA receptors in zebrafishPatten, Shunmoogum Aroonassala. January 2009 (has links)
Thesis (Ph. D.)--University of Alberta, 2009. / Title from pdf file main screen (viewed on Dec. 21, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physiology, Cell Biology and Developmental Biology, Department of Biological Sciences, University of Alberta." Includes bibliographical references.
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Recherches sur un appareil qui se trouve sur les poissons du genre des Raies (Raia, C.) et qui présente les caractères anatomiques des organes électriques /Robin, Ch. January 1900 (has links)
Thèse de doctorat : Zoologie : Faculté des sciences de Paris : 1847. / Titre provenant de l'écran-titre.
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The history of the germ cells of Cottus bairdii Girard ...Hann, Harry Wilbur, January 1900 (has links)
Thesis (Ph. D.)--University of Michigan, 1926. / Cover title. Thesis note on label mounted on p. 427. Letterpress on versos facing the plates. "Reprinted from the Journal of Morphology and Physiology, vol. 43. no. 2, March, 1927." Bibliography: p. 478-480.
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