Site and Species Observations. June 26, 2015
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1 June 26, 2015 Mason County Department of Community Development Attn: Grace Miller, Senior Planner 411 N. Fifth Street PO Box 279 Shelton, WA Re: Geoduck Floating Nursery Monitoring Plan, Quarterly Reporting Dear Ms. Miller: We present the results for the first quarterly monitoring of Year 3 of the Seattle Shellfish geoduck floating nursery at Spencer Cove, Harstine Island, conducted on Monday, June 8, This work has been performed in accordance with our agreement dated October 2, 2012, and covers work through June 16, Continued activity during this period included light readings, photographs, depth measurements, and fish counts taken from the five established locations on the log boom adjacent to the floating nursery beds. Five sites were selected on May 31, 2013, to evenly cover the full length of the nursery beds, and were permanently marked on the log boom. Site 1 was established at the north end of the log boom, with Site 5 at the southern end. Similar to previous monitoring efforts, light readings were taken with a Li-Cor spherical quantum sensor off the east and west sides of the log boom, with readings underneath nursery beds where present. Nursery beds are occasionally moved, so site-specific light readings vary. Photographs were taken in the four (approximate) cardinal directions at each site, in order to capture the surrounding location and water conditions. Depth measurements were taken at the point of each light reading. Depth was considered accurate to the nearest 0.1 meter (m), given the soft sediment and poor visibility to the bottom, but localized currents and wave action can cause readings to vary by 0.5 m or more relative to mean lower low water (MLLW). Similarly, fish schools greater than 10 fish were estimated to the nearest 10 fish. Site and Species Observations Species of algae attached to the log boom and nursery rafts were dominated by laminarian kelp, but much of the kelp was in poor condition and at least partially covered with filamentous red and green algae. Two species of green algae present were Ulva lactuca and Ulva linza, both in moderate abundance. Small aggregations of rock weed (Fucus sp.) were also present in low abundance. Laminarian kelp was found in greater density and length on the east side of the log boom. The filamentous red and 190 W Dayton Street, Suite 201 Edmonds, Washington Fax Tel
2 Mason County Department of Community Development June 26, 2015 Page 2 green algae were present in moderate to great abundance in all areas of the log boom and rafts, some attached and some unattached in floating rafts that were trapped by the structures (Photographs 1 3, 5 7, and 9 20). The invertebrate species complex has been mostly consistent between quarterly monitoring at all five sites. Invertebrates were dominated by sessile species attached to the log boom or on laminarian kelp. These included mussels (Mytilus sp.), barnacles, anemones, and keyhole limpets (Diodora aspera). Hydroids have, at times, been the dominant species present. Typically they are attached to both the floating structures and kelp, but hydroids were largely absent during this sampling period. Previously encountered bryozoans were also not observed during this monitoring event. These are native species to Puget Sound and are common on docks and floating structures. No fish were observed near the log boom. The only pelagic invertebrates present were moon jellies (Aurelia aurita). The only birds observed nearby were gulls. There were only three platforms attached to the log boom this monitoring period, as operations remained near early spring levels. Platforms were observed between Sites 2 and 4, to the south and west of the log boom. Drift algae and some wood debris were present throughout the nursery, primarily on the north, south and west sides of the structures. Organic debris and detritus move in relation to the tide, and can be found in greater abundance between different rafts depending on a flood or ebb tide. The occurrence of detritus is also seasonal, and largely dependent on terrestrial plant growth cycles. Light and Depth Readings Weather was sunny, warm, calm, and there was little to no wave action against the log boom. Reported depths are corrected relative to MLLW, based on tidal height from the closest NOAA tidal reference station (McMicken Island, Case Inlet). South Puget Sound tides are based on the Elliot Bay NOAA buoy in Seattle. Light levels are reported in micro-einsteins. Light attenuation levels, calculated from the difference between surface and bottom light levels, are reported as an attenuation coefficient (K(m -1 )). Greater attenuation coefficients indicate greater light absorption or scattering in the water column from turbidity or plankton, for example. A large attenuation coefficient means that light is quickly attenuated (lost) as it passes through the water, and a small attenuation coefficient means that the water is relatively transparent. The daily and seasonal angle of the sun also affects in-water light readings because of surface reflectance and scattering through the water column. Average attenuation coefficients were the lowest recorded, averaging 0.10 and 0.13 K(m -1 ) for the east and west sides of the log boom respectively. The differences between east and west attenuations were the highest recorded since monitoring began in May 2013, due to the large algae rafts trapped adjacent to the platforms. Attenuation coefficients during June surveys were all lower than a threshold value of 1.0 K(m -1 ), at which light availability is limiting for eelgrass and phytoplankton growth in estuaries
3 Mason County Department of Community Development June 26, 2015 Page 3 deeper than 6 m. We do not believe that light attenuation caused by the log boom, nursery rafts, or trapped algae was high enough to significantly affect biological productivity of benthic photosynthetic organisms. Table 1 Light Readings and Fish Counts (June 8, 2015) Site Time Depth (m; MLLW) Light, Surface (microeinsteins) Light, Bottom East (microeinsteins) Light, Bottom West (microeinsteins) Attenuation Coefficient, East (K[m -1 ]) Attenuation Coefficient, West (K[m -1 ]) Fish Species 1 10: * * None : * * 0.01 None : None : None : None 0 *Surface light readings and attenuations skewed by floating algae rafts. Summary Fish Count Species of algae present have undergone a seasonal change during the spring months. Filamentous red and green algae have taken over as the most abundant algae around the structure; such algae are often associated with eutrophic conditions. Invertebrates present were similarly diverse as previous observations, and no fish were observed this monitoring period. Fish have not been observed during surface monitoring events since Natural seasonal differences in light availability and algal growth were observed, as reflected in surface light levels and the attenuation coefficients. Quarterly monitoring for June 2015 represented the ninth monitoring at the Seattle Shellfish geoduck nursery beds since May Light attenuation levels for Sites 1 and 2 were affected by overwater algae debris, causing surface light levels to be dimmer compared to bottom levels. Light attenuation levels for Sites 3, 4 and 5 were average compared to other monitoring events and lower than levels recorded during the June 2015 survey. Light attenuation values may be influenced by the nursery rafts, platforms and trapped algae. However, light attenuation values were all lower than the threshold value of 1.0 K(m -1 ), at which light availability is limiting for eelgrass and phytoplankton growth in estuaries deeper than 6 m. Depth readings across sites were similar for each site as the previous observations in March 2015, and were consistent overall with findings since the surveys began in May Depth readings were taken during a slack tide with no wind or waves, but barometric pressure and shoreline features can also affect the accuracy of depth measurements. Soft sediment bottoms are also more dynamic than rocky substrate features. Depth readings help monitor for any potential sedimentation from the nursery rafts and observed depths suggest no sediment accumulation from the nursery rafts has occurred.
4 Mason County Department of Community Development June 26, 2015 Page 4 A complete analysis comparing results between quarterly monitoring events will be provided in the July 2015 annual report. The next quarterly monitoring will occur in early September Please do not hesitate to call if you have any questions regarding this monitoring report. You can reach me at (425) or by or cell phone as listed below. Sincerely, HART CROWSER, INC. HANS HURN Fisheries Biologist (206) (cell) hans.hurn@hartcrowser.com Attachments: Photograph Log, June 8, 2015 cc: Jeff Barrett R:\NOTEBOOKS\ _Seattle Shellfish Monitoring\Deliverables\Reports\Quarterly Report \Seattle Shellfish Quarterly Report docx
5 Hart Crowser Photograph Log June 8, 2015 Site 1 Photograph 1 Site 1, facing east Photograph 2 Site 1, facing north Photograph 3 Site 1, facing south Photograph 4 Site 1, facing west
6 Site 2 Photograph 5 Site 2, facing east Photograph 6 Site 2, facing north Photograph 7 Site 2, facing south Photograph 8 Site 2, facing west
7 Site 3 Photograph 9 Site 3, facing east Photograph 10 Site 3, facing north Photograph 11 Site 3, facing south Photograph 12 Site 3, facing west
8 Site 4 Photograph 13 Site 4, facing east Photograph 14 Site 4, facing north Photograph 15 Site 4, facing south Photograph 16 Site 4, facing west
9 Site 5 Photograph 17 Site 5, facing east Photograph 18 Site 5, facing north Photograph 19 Site 5, facing south Photograph 20 Site 5, facing west
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