NSIS Volume 39 - Part 3
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Item Open Access Table of contents (v. 39, p. 3)(Dalhousie Printing Centre, 1992-03) Nova Scotian Institute of ScienceTable of ContentsItem Open Access Item Open Access Morphology, growth and phenology of Petrocelis middendorffii.(Dalhousie Printing Centre, 1992-03) Chen, L.C-M.; Edelstein, T.The non-calcarious red alga Pelrocelis middendorffii was studied in situ in the Bay of Fundy over the period October 1975 - May 1989. This species, widespread throughout the Bay, is found attached to rocks below the Ascophyllumzone, downwards to just beyond the Mastocarpus-Chondrus zone. In some sites e.g. Gulliver's Cove and Sandy Cove, DigbyCo., the crusts occur only in a narrow zone about 1 m above mean low water between the Maslocarpus-Condrus and coralline zones. The diameter of crusts varied (0.01-0.5 m), and were generally thicker at the periphery than at the center. The thickness of the perithallium varied with season, the position in the crust, and the presence of developing tetrasporangia. Measurements in permanent quadrats revealed that crusts grew with a radial expansion rate of 1-1.5 mm y-1. This growth occurred from spring to early autumn, and produced a pattern of concentric grooves that may be interpreted as annual growth rings. A coalescence of small crusts into a larger patch of crust exhibiting several concentric grooves was sometimes seen. Tetrasporangia were observed throughout the year. Mature tetraspores arranged cruciately were observed in intercalary perithallial filaments from late November to early March. Following the release of tetrasporcs during this period, the crusts turned greenish, except at the margins, and the discolored perithallial filaments were regenerated. After more than three years of monthly observations at Gulliver's Cove, we had not detected the germination of sporelings of either Pelrocelis or Mastocarpus on substrates of cleared rocks, glass slides or permanent quadrats. However, Ulva, Porphyra, Chondrus and other macrophytes became established from spores at these sites.Item Open Access Trace elements in water, sediment, and biota of three oligotrophic lakes in Queens and Annapolis counties, Nova Scotia.(Dalhousie Printing Centre, 1992-03) Freedman, B.; Maessen, O.; Beauchamp, S.; Kerekes, Joseph J.; Peterson, R.H.; Fisher, K.Concentrations of a range of elements have been measured in water, sediment, plankton, benthos, macrophytes and fish of three oligotrophic lakes in Kejimkujik National Park, Nova Scotia. lead appeared to be concentrated in the top centimeter of undisturbed sediment cores; probably due to anthropomorphic use of leaded gasoline. The low concentrations of calcium and magnesium in these waters are probably due to the substratum of impoverished basement rocks and glacial moraine. High concentrations of sodium and chloride reflect the influence of atmospheric aerosols of marine origin.Item Open Access Phytoplankton and water quality of the coastal waters of New Brunswick and adjacent areas(Dalhousie Printing Centre, 1992-03) Lakshminarayana, J.S.S.; Sita Devi, J.This paper gives the results of investigations during 1971 to 1964 on the phytoplankton of the coastal and marine waters of New Brunswick and Soctia-Fundy-Cody and Georges Bank regions. The phytoplankton composition, distribution and seasonal succession in relation to water quality are presented.Item Open Access Comparative production of Salmo salar (Atlantic salmon) and Salmo trutta (brown trout) in a small Nova Scotia stream.(Dalhousie Printing Centre, 1992-03) Randall, RG.; Claytor, R.R.; Chadwick, E.M.P.The production rate of juvenile Atlantic salmon (Salma salar and brown trout (Salma trutta) was estimated at a site in Mountain Brook, a small tributary of River Philip, Nova Scotia. S. salar were usually more abundant than S. trutta, but growth rate of S. trutta was Significantly greater. For both species, seasonal growth was restricted to a six month period (May to Octobert. For nine sampling dates between June 1986 and June 1988 total salmonid biomass averaged 3.6 g m-2 (range 1.2-5.6 g m-2), Production rate was similar for both species; total production was 3.5 g m-2 y-1 from June 1986 to June 1987 and 5.9 g m-2 y-1 from June 1987 to June 1988. Although S. trutta are not native to eastem Canada, a naturalized population has become established in River Philip, and they are cohabiting successfully with native S. salar. Future studies on population interactions and possible range extensions of introduced S. trutta would be beneficial for the management of salmonids in eastern Canada.Item Open Access Assembly and utilization of a database of fungal cultures held in Canadian collections.(Dalhousie Printing Centre, 1992-03) Brewer, D.; Schwartzentruber, K.; Taylor, A.Descriptions of holdings of live cultures in ten Canadian collections of fungi have been collated and assembled as an indexed database. The data include the binomial names of the organisms, the date and place of their isolations, the substrate on which they were found, their mode of preservation, human pathology and ability to produce toxic metabolites. Each entry on the file has a unique accession number which indicates the collection where the organism is to be found. This file is indexed with respect to accession number and organism name and can therefore be searched efficiently for a particular organism. genus or species using simple commands. Access the system, assembled on the Dalhousie University computer, has been freely available since 1987. At the moment it is not on line but is available to the public through the services of the librarian of the Institute of Science. In four years we have had no evidence of abuse of the system by the public.