Acoustic telemetry of Dungeness crab at a nearshore sediment disposal site
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1 Acoustic telemetry of Dungeness crab at a nearshore sediment disposal site Curtis Roegner Stephanie Fields Columbia River Estuary Conference ~ Astoria, Oregon 26 May 216
2 Motivation: Channel maintenance operations -Beach erosion mitigation -Impact by dredging/sediment deposition Recruitment to estuarine systems -Habitat use in estuary and near shore -Migration timing & triggers? Armstrong et al
3 Monitoring Approaches Crab pots Abundances of crab (traditional tool) Baited Lander Relative abundances before and after a disposal event Video Sled Densities in control and impact areas Acoustic Tags Movement of crabs in control and impact areas
4 P Sediment deposition plume THIN SHEET DEPOSITS PLUME SEDIMENT MOUNDING
5 Deposition events 5
6 Acoustic Node Array Baker Bay RECEIVER TAGGED CRABS A B 3 m CONTROL C D E F CamPod String + IMPACT IMPACT RECEIVER MINIMUM RECEPTION RANGE PLOT BOUNDARY G H South Jetty Site RECEPTION RANGE
7 Sediment Deposition Event (DRONE S EYE VIEW) 3 m CamPod daisy chain.5 m 2
8 Movement of tagged crabs 8
9 Impact Effects Mean Distance (se) Mean velocity (se) TAG RELEASE IV TAG RELEASE V TAG RELEASE VI C I C I C I C I C I C I Treatment
10 Environmental buoys SATURN 1 WL (m) Velocity (m/s) CURRENT TRIPOD RELEASE IV Direction (N=) Temperature Day of year 215 Roegner & Fields // 9 January 215 1
11 Post-impact movements N 33 3 Time = 45 min after deposition to 125 min after deposition = 8 min duration 3 6 PATH OF DREDGE CONTROL 9 VELOCITY (M/S) IMPACT
12 Post-impact movements CONTROL 9 IMPACT
13 RELEASE IV RELEASE V RELEASE VI Post-impact movements
14 Crab survival 14
15 Measurement metrics 7.5 h.1 m/s =36 m/h =8.6 km/d.1 m/s 623 m /119 min =.6 m/s.14 m/s
16 Crab ADV crab ID Velocity Direction Velocity Direction a b h
17 Climate factors affecting behavior? WIND (N/m 2 ) TEMPERATURE PRE-IMPACT IMPACT RECOVERY Wind stress Wave height SURFACE OFFSHORE DOWNWELLING WINDS FALL TRANSITION Warm blob 12 SJS bottom DAY OF YEAR 1 CRB surface SJS 1 DWS 5 BOTTOM SWS 8 NEARSHORE WAVES (m) Chlorophyll Day of year 214 Roegner & Fields // 9 January
18 Oceanography affecting behavior? Chlorophyll TEMPERATURE WIND (N/m 2 ) PRE-IMPACT IMPACT RECOVERY Wind stress Wave height SURFACE OFFSHORE % Oxygen 12 SJS bottom DAY OF YEAR CRB 32. surface SJS DWS 5 BOTTOM Salinity 8 SalinitySWS NEARSHORE Day of year 214 DOWNWELLING WINDS FALL TRANSITION Warm blob Roegner & Fields // 9 January WAVES (m) r 2 =.85 Chlorophyll
19 Depositions / day WIND Salinity Temperature Dissolved O2 Chlorophyll Turbidity (mg/l) CAPE ELIZABETH Environmental Buoy Data Day of year 215 Receiver Tag release CamPod Sled Deposition OFFSHORE SURFACE 14 m WAVES Summary Conducted Control-Impact experiments to investigate sediment deposition on crab. Acoustic data reveal that crabs are highly motile and exhibit directed motions. Acute survival appears high and no evidence of incapacitated or dead crab based on current velocity data. Limited examples indicate survival for weeks to months post-release. Conclude the thin disposal presents limited risk to crabs and is an effective management tool for this system. High temperatures and low DO are already at levels inducing stress (if food is limiting).
20 Acknowledgements: ODFW & WDFW CORPS / EPA CRCFA / Oregon Dungeness Crab Commission LCSG BrinEy Brian Kelly Capt Tim Stentz Chris Jacoben Drony Joe Aga Michael Wilkin & MERTS/CMOP Stephanie Fields Roegner & Fields // 9 January 215 2
21 More videos on YouTube at fishhead 21
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