Cenozoic sediments recovered during Leg 105 of the Ocean Drilling Program in Baffin Bay (Site 645) and the Labrador Sea (Sites 646 and 647) have yielded a persistent record of dinoflagellates and other marine palynomorphs. Hole 647A in the Labrador Sea contains an almost complete deep-water record of early Eocene through early late Oligocene sedimentation. Dinoflagellate assemblages indicate outer neritic to oceanic conditions throughout, but with possible increased influence from shelf environments during the early Eocene. Lower Eocene dinoflagellate assemblages are similar to coeval assemblages from the Rockall Plateau, but those from the middle through upper Eocene have mixed affinities, and are perhaps related to intensification of the proto-Gulf Stream. Oligocene dinoflagellate assemblages suggest the influence of both Arctic and North Atlantic watermasses at this site. A diverse marine palynoflora was recovered from upper Miocene and lowermost Pliocene sediments of Hole 646B in the central Labrador Sea. Palynomorph assemblages are thought to be largely allochthonous and may reflect changing bottom-water paleocurrents. The dinoflagellate flora consists of both oceanic and neritic species and indicates temperate surface-water conditions. Lower through lower upper Miocene dinoflagellates recovered from Baffin Bay (Hole 645E) indicate a cool-water, neritic environment. Assemblages have North Atlantic and Norwegian Sea affinities, but also contain notable protoperidiniacean elements. Dinoflagellate biostratigraphy estimates initiation of ice rafting in Baffin Bay at between 7.4 and 9.5 Ma. Increased terrigenous influx and apparent disappearance of certain dinoflagellate taxa occur in the middle to late Miocene and may be related to oceanographic changes or climatic deterioration. The erection of three new dinoflagellate genera, 19 new dinoflagellate species, and three new acritarch species, are among the many taxonomic proposals contained in this study of the Miocene. Several Miocene holotypes from Japan, have also been studied and compared to the Leg 105 material.

No description available.

In the field cricket, Teleogryllus oceanicus, two types of auditory interneurons, AN2 and ON1, have been studied. AN2 responds best to ultrasound frequencies (≥20kHz) produced by echolocating bats and initiates negative phonotaxis by the cricket. ON1 responds to both low (4-5kHz) and high frequency sounds and encodes the temporal information present in sounds of both frequencies. ON1 also provides lateral inhibition to contralateral interneurons, such as AN2, thereby enhancing binaural contrast. The pharmacology associated with these two interneurons is investigated here. ON1's response to 4.5kHz sound is increased following picrotoxin application, while it's ability to encode temporal information present in low and high frequency sounds is reduced. An increase in spiking response and a decrease in response latency to low frequency sound is produced by the addition of atropine, while d-tubocurarine application increased ON1's response latency to both 4.5kHz and 30kHz sound. The neuromodulator octopamine reduced AN2's response to ultrasound.

Thesis (Ph.D.)--Australian National University, 2001.

Thesis (Ph.D.) -- McGill University. / Written for the Dept. of Mathematics. Typescript. Bibliography: leaves 48-50.

Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (p. [138]-149).

Thesis (Ph. D.)--Princeton University, 1990. / Includes bibliographical references.

Thesis (M. Sc.)--Naval Postgraduate School, 1970. / "September 1970." Includes bibliographical references (leaves 208-209).

No description available.

The major constituents of the plankton, phytoplankton, cladocera, copepods and chaetognaths, sampled in the 1951 oceanographic survey of the British Columbia Inlets are reported in concentrations per cubic meter of water. Horizontal plankton tows sampled four depths, 5, 21, 32 and 47 feet, respectively. The distribution of each group is discussed in relation to the hydrographic data and the present theory of inlet circulation. The inlets investigated fall into two general groups, (a) those which are long and have a large freshwater discharge at the head and (b) those which have a small freshwater discharge and are short. The data from six inlets making up the former have been grouped together and are discussed as the Average Inlet. Those inlets making up the latter group are classified under the general heading of atypical inlets; each is discussed separately. In the Average Inlet the plankton volumes were the greatest at the mouth, particularly towards the surface. The concentration of plankton is shown to be a result of local phytoplankton production. In the absence of currents the phytoplankton are shown to be limited vertically by density. The zooplankton are divided into three groups on the basis of their response to the physical factors. The distribution of cladocera indicates that it is positively phototropic while that of the copepods and chaetognaths indicate that that they are negatively phototropic. The chaetognaths are found to be absent from all the atypical inlets, the cladocera from three. The copepods are concentrated at the depth which is associated with the compensation light intensity. Attention is drawn to the fact that this report is a qualitative description of the relationship between the distribution of the plankton and the physical oceanographic conditions. Future surveys will have to sample more extensively and intensively. / Science, Faculty of / Zoology, Department of / Graduate