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LAROCQUE, R., J-D. DUTIL, S. PROULX, M. THORNE, P.-M. SCALLON-CHOUINARD, M.-H. GENDRON, J. PLOURDE, T. SCHMITT, 2010. Contribution à la description de l'habitat des loups de mer (Anarhichas spp.) près de la péninsule gaspésienne par vidéo remorquée et relevés acoustiques multifaisceaux. Rapp. tech. can. sci. halieut. aquat., 2902, 51 p .
This report presents the results of several initiatives that examine the potential habitat of wolffish (Anarhichas spp.) in the Gulf of St. Lawrence and in particular near the Gaspé peninsula. The habitat features were examined at different spatial scales: by towed video, multibeam acoustic surveys and an examination of historical catch data. High-resolution bathymetry and backscatter coupled with information extracted from video allowed for a detailed description of environments known to be used by wolfish. Features believed to be favourable to wolfish were identified on both survey sites, including shelters and glacial scours. The resulting information is presented within the attached multimedia DVD-ROM. The complimentary nature of these methods and the management implications for a species at risk are discussed.
PLOURDE, J., J.-C. THERRIAULT, 2004. Climate variability and vertical advection of nitrates in the Gulf of St. Lawrence, Canada. Mar. Ecol. Prog. Ser., 279: 33-43 .
Using a modeling approach, we constructed a time series to examine interannual variability in the spring nitrate concentrations in the surface layer of the Gulf of St. Lawrence (GSL) for the period 1947 to 2000. This 2-step modeling approach used the lower boundary of the cold intermediate layer (CIL), a persistent summer characteristic of the temperature profiles in the GSL, to infer interannual variations in the depth of the winter mixed layer. Using a linear model describing the distribution of nitrates at intermediate depths, we estimated a time series of spring nitrate concentration in the surface waters of the GSL for the period 1947 to 2000. This early spring time series showed interannual fluctuations in nitrate concentrations of about 1 order of magnitude, attributable to variability in winter convection. Such variability in the spring nitrate availability should have a significant impact on the ecosystem. Some elements that should be taken into account in any future attempt to validate this estimated nitrate time series are discussed.©2004 Inter-Research
PLOURDE, J., D. GILBERT, 2001. La plus longue période froide de l'histoire climatique récente du golfe du Saint-Laurent. AZMP Bull. PMZA, 1: 18-19 .
A prominent feature of the water of the Gulf of St. Lawrence is the presence of a cold intermediate layer (CIL) that persists throughout the year. In summer, the cold intermediate layer (temperature below 2 degree C) is isolated from the atmosphere by the surface layer. In winter, the surface layer disapears and the cold layer extends to the surface. The fluctuations of the minimum temperature of the CIL largely reflect climate variability. During the year 2000, the minimum temperature of the CIL was above the long term average for the first time since 1983, ending the longest period observed in the Gulf of St. Lawrence since 1948.
PLOURDE, J., 2001. Oceanographic conditions in the Gulf of St. Lawrence during year 2000. Science, Stock Status Report, G4-01, 5 p .
PLOURDE, J., 2001. Les conditions océanographiques dans le golfe du Saint-Laurent au cours de l'an 2000. Rapport sur l'état des stocks, G4-01, 6 p .
PLOURDE, J., 2000. Oceanographic conditions in the Gulf of St. Lawrence during 1999. Science, Stock Status Report, G4-01, 6 p .
PLOURDE, J., 2000. Les conditions océanographiques dans le golfe du Saint-Laurent en 1999. Rapport sur l'état des stocks, G4-01, 6 p .
THERRIAULT, J.-C., J. PLOURDE, 1997. Development of an environmental index for the detection of climate changes in the Gulf of St. Lawrence : ecological interpretation of first results and implications for future monitoring programs. Pages 226-231 in R.W. Shaw (ed.). Climate variability and climate change in Atlantic Canada : proceedings of a workshop, Halifax, Nova Scotia, 3-6 December 1996. Environment Canada - Atlantic Region, Bedford, Nova Scotia (Occasional report, 9) .
DIONNE, E., J.N. GEARING, N. BERTRAND, P.J. GEARING, J.-C. THERRIAULT, J. PLOURDE, 1996. Répartition de certains hydrocarbures dans le seston de l'estuaire du Saint-Laurent et du fjord du Saguenay, 1990. Rapp. stat. can. sci. halieut. aquat., 977, 186 p .
This report lists the concentrations of polycyclic aromatic hydrocarbons (PAHs), aliphatic hydrocarbons, and chlorinated hydrocarbons extracted from different size fractions of suspended particles in the St. Lawrence Estuary and the Saguenay Fjord in l990. (DBO).
SIMARD, N., J.-C. THERRIAULT, P. LAROUCHE, A. VÉZINA, J. PLOURDE, J. PERCY, D.A. STEEL, 1996. Données d'océanographie physique et biologique recueillies dans l'est et le nord de la baie d'Hudson et dans le détroit d'Hudson en août et septembre 1993. Rapp. stat. can. sci. halieut. aquat., 978, 199 p .
This report presents physical and biological oceanograpahic data of the eastern and northern parts of Hudson Basin that were obtained during a sampling mission of 84 stations conducted between 22 August and l5 September l993. A summary table identifies variables measured at each station. The vertical profiles of temperature, salinity, in situ fluorescence, chlorophyll a, particulate organic carbon and nitrogen, and nutrients are presented as well as phytoplankton and zooplankton counts and zooplankton biomass determination. Photosynthetic parameters calculated from P-l curves and estimates of total primary production at the surface are also provided. (DBO).
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