NSIS Volume 38 - Part 2
Permanent URI for this collectionhttps://hdl.handle.net/10222/15120
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Item Open Access Table of contents (v. 38, p. 2)(Dalhousie Printing Centre, 1989-09) Nova Scotian Institute of ScienceItem Open Access Shoot multiplication, growth and adventitious rooting in three cultivars of Vitis, in vitro.(Dalhousie Printing Centre, 1989-09) Hicks, G. S.; Dorey, M.An in vitro propagation scheme was established for three commercially attractive cultivars of Vitis spp.: "Marechal Foeh", "Precose del Colmar" and "Siegfried ". Terminal and axillary buds from growing vines were used roestablish stock multipleshoot cultures on Murashige and Skoog medium (MS), supplemented with N6-benzylamino-purine (BAP). In shoot multiplication trials, the highest shoot numbers were observed after 12 weeks using 5.0 µM SAP; shoot morphology was somewhat distorted at 5.0-10.0 µM SAP, but not at lowerconcentrations(2.S-3.75µM BAP). ln rooting trials, rapid rooting at high frequencies was observed on MS medium. lndole-3-butyric acid increased the number of roots in some trials, and rooted microcuttings could be grown on in soil.Item Open Access An examination of North and South American isolates of Pithomyces chartarum for production of sporidesmin and sporidesmolides.(Dalhousie Printing Centre, 1989-09) Brewer, D.; Russell, D.W.; deMelio Amaral, R. E.; Aycardi, E. R.Two hundred and fifty two isolates of Pirhomyces chartarum have been collected from pastures in Brazil (101), Colombia (30), Texas (5), and Nova Scotia (116) during the last 20 years. It has been possible to examine 57 of these, 2 from Texas, 3 from Nova Scotia, 20 from Colombia, and 32 from Brazil, in detail. Twenty-one of these isolates produced spores on rye-grain medium and all produced sporidesmolides J to V in similar proportions. Ten of the isolates also produced metabolites that inhibited the growth of Micrococcus luleus but noneaf the isolates produced sporidesmin or anyof its known 9 congeners in amount greater than the detectable limits. Thus P. chartarum in these American countries appear to differ physiologically from isolates of the same species found in Australia, New Zealand, and South Africa.Item Open Access Community analysis of fish populations in headwater lakes of New Brunswick and Nova Scotia.(Dalhousie Printing Centre, 1989-09) Peterson, R.H.; Martin-Robichaud, D. J.Five fish community assemblages, based upon surveys with gill-nets, were identified in Maritime headwater lakes. These were (11 brook trout only, (2) brook trout-white sucker, (3) multispecies with white sucker, yellow perch and brown bullhead most frequent members, (4) yellow perch only and (5) multispecies with smallmouth bass and/or white perch. The two lake physico-chemical parameters most important in determining fish community were pH and lake area. Brook trout-only lakes had the least area, while yellow perch-only lakes were the most acidic (mean pH of 4.60). It is suggested that lakes containing only yellow perch may have once contained assemblage (3), but have become too acidic for any but yellow perch.Item Open Access Lobster larval abundances in Lobster Bay, Yarmouth Co., Nova Scotia(Dalhousie Printing Centre, 1989-09) Tremblay, D. M.; Sharp, G. J.A program to develop methods of capturing newly settled Stage IV larvae included the need to identify areas with significant planktonic concentrations of Stage IV larvae in Lobster Bay, Yarmouth Co., N.S. During the study, 171 larvae were collected, including 12 at four selected inshore stations studied by Stasko and Gordon (1983) in 1977-1978. Eighty-nine percent of all the larvae were captured within the environs of Whitehead Island. Exploratory towing, despite the wide range of sites, was the least successful category of stations (five larvae in 19 tows). A day-night towing cycle yielded the largest number of larvae at twilight At Stasko's and Gordon's (1983) inshore stations, Stages I and IV exclusively were captured. Stage IV lobster larvae were rarely captured during our sampling, despite predominance of daytime towing. This survey differed from previous southwestern Nova Scotia surveys by sampling over shallow waters (less than 20 m) and adjacent to land.