NSIS Volume 37 - Part 1
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Item Open Access Table of contents (v. 37, p. 1)(1987-12) Nova Scotian Institute of ScienceItem Open Access Obituary: R.D. Tulloch(1987-12) Nova Scotian Institute of ScienceItem Open Access Analysis of zooplankton communities of Nova Scotia lakes with reference to water chemistry(Dalhousie Printing Centre, 1987-12) Strong, K.W.Zooplankton collections from Nova Scotian lakes were analysed to determine if relationships existed between plankton distributions and chemical variables associated with acid rain. A total of 27 taxa was identified. The most common species included Diapromus minutus, Bosmina longirostris and Mesocyclops edax. Most lakes contained 3-7 species (excluding rotifers and copepod nauplii) and were dominated by 1-3 species. Simple statistics such as the number of species, diversity index, and evenness index were poorly correlated with abiotic variables. The best correlations indicated that diversity and evenness were negatively correlated with water temperature, water transparency and lake area, and positively correlated with conductivity. Principal component analysis demonstrated that two species, D. minutus and B. longirostris, account for the greatest proportion of the abiotic variance in zooplankton communities. D. minutus was associated with warm, turbid waters of decreased acidity whereas B. longirostris dominated in the opposite conditions (PC1). Mesocyclops edax was usually dominant in clear, deep lakes (PC2), and Daphnia Catawba was often dominant in lakes with highly coloured water (PC3). The first three principal components accounted for about 73% of the total variance in zooplankton composition.Item Open Access Moelleropsis (Lecanorales) as a component of Erioderma habitats in Atlantic Canada(Dalhousie Printing Centre, 1987-12) Maass, W.S.G.One of the many sterile epiphytic lichens from high humidity forest habitats in Atlantic Canada has been identified as belonging to Moelleropsis (Lecanorales). The assignment was made on the basis of the granular, virtually undifferentiated thallus which is remarkably similar to that of the European M. nebuasa (Hoffm.) Gyel., but pseudofruticose ramifications from the thallus surface and fruiting bodies were not observed. The Canadian Moelleropsis is described as a subspecies of M. nebulasa, namely ssp. frullaniae. The epithet refers to the hepatic Frullania tamarisc ssp. asagrayana which is the preferred substrate of the lichen. The taxonomic difficulties in assessing cell size differences between the symbionts of closely related lichens are outlined.Item Open Access Disiloxanes and other artifacts from a reversed-phase high pressure liquid chromatography identified by mass spectrometry(Dalhousie Printing Centre, 1987-12) Russell, D.W.; Gillis, H.A.When a mixture of hydrophobic compounds was separated by reversed-phase high-performance liquid chromatography, one product was heavily contaminated with a mixture of long-chain alkyldisloxanes. These compounds, together with silanols, silyl ethers, and poly(dimethylsiloxanes), were formed by hydrolysis of the bonded phase.Item Open Access A species of Tricophyra (Suctoria: Dendrosomidae) from Catostmus commersoni Lacapede in Nova Scotia(Dalhousie Printing Centre, 1987-12) Wiles, M.; Cone, D.K.A species of Trichophrya (Suctoria: Dendrosomidae) is described from the gills of Catostomus commersoni Lacepede taken in a Nova Scotian river. The material resembles specimens referred to as T. cataslomi Heckmann and Carroll, 1985 nomen nudum from the gills of Catostomus caloslamus in the midwestern United States. Specimens in both localities similarly attach to the broad face of the secondary lamellae, causing significant epithelial necrosis and erosion, and they noticeably avoid the lamellar tips. These striking morphological, behavioural and pathological traits support the idea that published reports from fishes throughout North America include an unidentified species complex which is not referable to T. piscium Butschli, 1889.Item Open Access Vitamins A, D3 and E in Nova Scotian cod liver oils(Dalhousie Printing Centre, 1987-12) O’Keefe, S.F.; Ackman, Robert G.,1927-There has been no production of cod liver oil in Nova Scotia for decades and in this time fish stocks and landings have been altered by the overfishing and resultant quotas and restrictions. Accordingly individual livers from cod, Gadus morhua, taken in three Nova Scotia fishing areas were examined for vitamins A, D3and E. Average contents for fish landed in Yarmouth, Lower Prospect and Canso respectively were: -Vitamin A, 1100, 420 and 850 retinol equivalents (R.E.) g-1 oil; vitamin D3, 1.56, 0.88 and 0.88 µg g-1 oil; vitamin E, 259, 286, 320 µg g-1 oil. In terms of meeting current pharmaceutical standards for commercial oils there is a reasonable prospect of vitamin A content being at or near requirements, but vitamin D3 would likely have to be supplemented. Vitamin E contents correlate with other oil soluble vitamin values, suggesting that the content of this oil-soluble material may be related to the age and size of fish as is the case with vitamins A and D3.