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An assessment of the limnological status and productive capacity of Babine Lake, 25 years after the inception of the Babine Lake Development Project

Author: K S Shortreed; K F Morton; Canada. Department of Fisheries and Oceans.; Cultus Lake Research Laboratory.
Publisher: Cultus Lake, B.C. : Fisheries and Oceans Canada, Cultus Lake Salmon Research Laboratory, 2000.
Series: Canadian technical report of fisheries and aquatic sciences, no. 2316.
Edition/Format:   Book   Microform : National government publication : Microfiche : EnglishView all editions and formats
Database:WorldCat
Summary:
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  Read more...
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Details

Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: K S Shortreed; K F Morton; Canada. Department of Fisheries and Oceans.; Cultus Lake Research Laboratory.
OCLC Number: 47857860
Language Note: English with French summary.
Reproduction Notes: Microfiche. [Ottawa? : Fisheries and Oceans Canada?, 2000?]. 1 microfiche : negative.
Description: iv, 52 p. : ill. ; 28 cm.
Series Title: Canadian technical report of fisheries and aquatic sciences, no. 2316.
Other Titles: Assessment of the limnological status and productive capacity of Babine Lake Development Project
Responsibility: by K.S. Shortreed and K.F. Morton.

Abstract:

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.

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Linked Data


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