Wahleach Project Water Use Plan Wahleach Reservoir ... - BC Hydro

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Density (cells mL -1 ) Biovolume (mm -3 L -1 ) 6000 5000 4000 3000 2000 1000 0 2.5 2.0 1.5 1.0 0.5 0.0 Jun-04 Jy-04 Bacillariophytes Chryso & Chrytophytes Dinophytes Chlorophytes Cyanobacteria Aug-04 Sep-04 Oct-04 Nov-04 May-05 Figure 10. Mean seasonal densities and biomass of the major phytoplankton classes in Wahleach Reservoir, 2004-2006. Jun-05 Chrysoflagellates and Chryptoflagellates account for between 39 and 47% of the abundance (Fig. 11) and between 13 and 25% of the biomass (Fig. 12). There was a great diversity of nanoflagellates ranging in size from 2-20 μm, and the most common genera were Chromulina sp., Chrysochromulina sp., Dinobryon sp., Rhodomonas sp., and a mixed assemblage of unidentified small microflagellates. Wahleach Reservoir Fertilization Project, 2004-2006. Jul-05 Aug-05 Sep-05 Oct-05 May-06 Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 22
Chrysoflagellates and Chryptoflagellates are the size class of phytoplankton that are readily consumed by Daphnia, which in turn is the preferred food source of kokanee salmon (Thompson (1999) and Perrin et al (2006). Contribution of each phytoplankton class to density (%) 1.0 0.8 0.6 0.4 0.2 0.0 yr 2004 2005 2006 Diatoms Chryso/Cryptoflagellates Dinoflagellates Chlorophytes Cyanobacteria Figure 11. Contribution of phytoplankton classes to the monthly mean density in Wahleach Reservoir, 2004-2006. Diatoms were the second most common phytoplankton class, accounting for between 34 and 39% of the density (Fig. 11) and between 40 and 45% of the biomass (Fig. 12). The following genera were commonly observed in the reservoir; chain forming Rhizosolenia sp, Tabellaria fenestrate, Asterionella formosa var1, Cyclotella glomerata and Cyclotella stelligera. Generally long chain forming diatoms are too large to be effectively consumed by herbivorous Daphnia sp and in deep systems or systems with little littoral zone, the carbon in these large cells (also called microplankton) are considered to be carbon sinks. However in Wahleach Reservoir, it is likely that the pelagic fertilization and littoral benthic process are strongly linked and nutrients that are taken up by pelagic phytoplankton may eventually sink and settle to the sediment, increasing the food availability for detritivores. The blue-green algae (Cyanophytes) were the next more common taxa, accounting for between 11 and 17% of the abundance (Fig. 11) but due to their small size they make only a small contribution (
Page 1 and 2: Wahleach Project Water Use Plan Wah
Page 3 and 4: Citation: Harris, S.L., D. Sebastia
Page 5 and 6: spawners, from 0 spawners at the st
Page 7 and 8: Table of Contents EXECUTIVE SUMMARY
Page 9 and 10: List of Figures Figure 1 Map of stu
Page 11 and 12: List of Tables Table 1. Annual fert
Page 13 and 14: 1 Introduction The Wahleach Reservo
Page 15 and 16: 3. Methods 3.1 Fertilizer Additions
Page 17 and 18: Photo 1. Old tank farm, consisting
Page 19 and 20: Nitrogen Load (mg·N·m -2 ) 140 12
Page 21 and 22: Vertical profiles of dissolved oxyg
Page 23 and 24: y gravid females and the lengths of
Page 25 and 26: hydroacoustic surveys was used in o
Page 27 and 28: 4. Results 4.1 Reservoir elevation
Page 29 and 30: 4.3 Water Chemistry The mean pH was
Page 31 and 32: Silicic acid is used by diatoms to
Page 33: Density (cells mL -1 ) 4000 3000 20
Page 37 and 38: 4.5 Zooplankton The zooplankton com
Page 39 and 40: Density (individuals·L -1 ) Biomas
Page 41 and 42: 4.6 Spawner Surveys The number of k
Page 43 and 44: providing some spawning opportuniti
Page 45 and 46: Kokanee spawners 10000 8000 6000 40
Page 47 and 48: Catch Per Unit Effort (# Fish·Net
Page 49 and 50: Weight (mm) Fork Length (mm) 60 55
Page 51 and 52: 4.8 Hydroacoustics Good weather pro
Page 53 and 54: strengths suggested these fish were
Page 55 and 56: Table 5 lists the range and the mea
Page 57 and 58: Wahleach Reservoir had lower total
Page 59 and 60: 6. Recommendations 1) Fertilization
Page 61 and 62: 7. References APHA. 1985. Standard
Page 63 and 64: Pick, F.R. and D.R.S. Lean. 1987. T
Page 65 and 66: Appendix 1. Phytoplankton species a

Wahleach Project Water Use Plan Wahleach Reservoir ... - BC Hydro

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