| ID |
2722 |
| Citation |
Shortreed, K.S.; Hume, J.M.B.; Malange, K. (2007) Preliminary categorization of the productivity of 37 coastal and skeena river system lakes in British Columbia, Fisheries and Oceans Canada, Can. Tech. Rep. Fish. Aquat. Sci. 2718: 91p. |
| Organization |
Fisheries and Oceans Canada |
| URL |
http://salmonwatersheds.ca/library/lib_261/ |
| Abstract/Description or Keywords |
We carried out limnological surveys of 37 lakes on ritish Columbia's north coast and Skeena River system. Limnological data collected on these surveys enables us to make preliminary estimates of the lakes' trophic status and productive capacity for juvenile sockeye. Of the 37 lakes, one (Moore) was meromictic and one other (Tsimtack) was more properly termed a tidal lagoon than a lake. Thermal structure of the lakes ranged from warm monmictic (18 lakes) to dimictic (13 lakes) to cold polymictic (6 lakes). Euphotic zone depths ranging from 0.4-23m. Total phosphorus concentraitons ranged from 1.4-16.5microg/L, indicating a wide range in trophic status in the surveyed lakes. Phytoplankton photosynthetis rates (PR) ranged form the lowest (8 mg Cm-2d-1) to among the highest (387 mg Cm-2d-1) yet recorded for a B.C. sockeye nursery lake. We categorized the lakes based on water type (glacial, organically stained, clear) and found significant decreases in physical, chemical, and biological variables between the three lake types. In most cases, staied lakes had lower values for chemical variables and had less abundant plankton communities than clear lakes. Preliminary estimates of productive capacity indicate that sockeye escapements (normalized to lake area) needed to maximize sockeye smolt biomass ranged from 2-89 spawners/ha. |
| Information Type |
Report |
| Regional Watershed |
Skeena River |
| Sub-watershed if known |
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| Aquifer # |
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| Comments |
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| Project status |
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