WorldCat Identities

Morton, K. F.

Overview
Works: 5 works in 24 publications in 1 language and 63 library holdings
Roles: Author
Classifications: SH223, 639.205
Publication Timeline
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Most widely held works by K. F Morton
An assessment of the limnological status and productive capacity of Babine Lake, 25 years after the inception of the Babine Lake Development Project by K. R. S Shortreed( Book )

7 editions published in 2000 in English and held by 24 WorldCat member libraries worldwide

Construction of spawning channels in the late 1960's during the Babine Lake Development Program (BLDP) has resulted in increased sockeye escapements and fry densities in most years from the early 1970's to the present. In 1994 and 1995 we carried out a limnological study of Babine Lake to determine its current trophic status and rearing capacity for juvenile sockeye salmon (Oncorhynchus nerka). We investigated the effect of the increased escapements and fry densities on lake physics, chemistry, lower trophic levels, and sockeye diet by comparing our data with similar data collected before (Johnson 1961, 1964) and shortly after (Stockner and Shortreed 1975; Rankin 1977) the inception of the BLDP. Current spring overturn total phosphorus concentrations (5-9 mg/L), seasonal average chlorophyll concentrations (1.9-2.5 mg/L), and bacteria numbers (<1.7x10⁶/mL) indicate the lake is in the middle to upper range of oligotrophy. The average C:N:P ratio was 314:31:1, indicating that the lake was P-limited. Total phosphorus loading has increased approximately 38% from estimates prior to enhancement, primarily because of increased sockeye escapements (i.e. nutrients from carcasses). Seasonal daily photosynthetic rates were 125 mg C·m-2·d-1 in 1994 and 155 mg C·m⁻²·d⁻¹ in 1995, higher than the 1973 average of 100 mg C·m⁻²·d⁻¹. Daphnia were the dominant prey item of juvenile sockeye both before BLDP and during our study. However, in our study grazing pressure on the zooplankton community (inferred from fall fry densities and smolt numbers) was much lower than in most years after BLDP and was similar to years before BLDP. Available evidence indicates that despite consistently higher fry densities as a result of BLDP, Babine Lake remains a quality nursery area for juvenile sockeye and its rearing capacity has not been exceeded. However, evidence from 1973 diets suggests that some of the higher post-BLDP fry recruitments have neared or reached the lake's rearing capacity and that further increases in fry recruitment would not result in additional smolt production
Sockeye salmon (Oncorhynchus nerka) utilization of Quesnel Lake, British Columbia by K. F Morton( Book )

7 editions published in 1990 in English and held by 18 WorldCat member libraries worldwide

Sockeye salmon are commercially the most valuable of the 5 species of Pacific salmon in B.C. Since juvenile sockeye spend 1-2 years of their early life in lakes prior to migrating to the sea, the freshwater element is important. Quesnel Lake is one of the major sockeye salmon producers in the Fraser River system and there are proposals to further enhance Quesnel stocks by constructing artifical spawning channels, increasing natural spawning habitat and lake fertilization. This study documents juvenile sockeye nearshore dispersal, offshore spacial distribution and feeding to identify areas where fish production may be limited. Implications of within lake sockeye distribution future enhancement as well as potential effects of logging on sockeye production are reported. Distributions were documented using hydroacoustic and visual observations, while growth and diet information were obtained from samples captured with a midwater trawler. Zooplankton community structure was determined from stratified samples collected in horizontal tows
Trophic status and rearing capacity of Francois and Fraser Lakes by K. R. S Shortreed( Book )

4 editions published in 1996 in English and held by 13 WorldCat member libraries worldwide

This report systematically examines lake physics, chemistry, and all trophic levels important to juvenile sockeye salmon at two sockeye nursery lakes on the Fraser River system. Objectives of the study included determination of trophic status and productivity of the lakes, factors controlling lake productivity, plankton community species composition and biomass, and juvenile sockeye numbers, size, and diet. The final objective was to use these data and a rearing capacity model to estimate optimum escapements to, and maximum smolt outputs from, the two lakes
Sockeye Salmon (Oncorhynchus nerka) Utilization of Quesnel Lake, British Columbia by Canada( Book )

2 editions published between 1989 and 1990 in English and held by 4 WorldCat member libraries worldwide

Results from a seven-year limnological study of Shuswap Lake by K. F Morton( Book )

4 editions published in 1996 in English and held by 4 WorldCat member libraries worldwide

Contains summary data on zooplankton collected monthly (April to November) over 1987-93 from Shuswap Lake, British Columbia. Sampling stations were located in each of the four arms of the lake as well as in Mara Lake. Specimens collected in vertical hauls and at discrete depths were counted, measured, and identified as to genus. Biomass was estimated using body length measurements. Length, density, and biomass for each common taxonomic group as well as total macrozooplankton abundance and biomass are presented in tables by station and date. Seasonal average biomass data are presented for common copepods, cladocerans, and total macrozooplankton by year and station
 
Audience Level
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Audience Level
1
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Audience level: 0.74 (from 0.67 for Sockeye Sa ... to 0.87 for Results fr ...)

Languages
English (24)