Green Crab Control: A removal effort in a shallow central California estuary. Larson, A.A., de Rivera, C.E., Ruiz, G.M., Grosholz, E.D., Sytsma, M.D.
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1 Green Crab Control: A removal effort in a shallow central California estuary. Larson, A.A., de Rivera, C.E., Ruiz, G.M., Grosholz, E.D., Sytsma, M.D.
2 Goal To test the feasibility and effects of locally removing a well-established population of a marine organism with pelagic larvae. Removal of adult European green crabs (Carcinus maenas) from Bodega Harbor as a model system to develop and inform management options for eradication, rapid response, and control of marine invaders.
3 Bodega Harbor, California C. maenas since 1993 Well studied over time Knowledge of native community pre-invasion and early invasion (since 1980s) Rebound to natural conditions Bodega Bay San Francisco Bay
4 Project Timeline Evaluate initial conditions in Bodega Harbor June 2006 (before C. maenas removal) Population estimates (Mark-Release-Recapture) Relative abundance measures (Standardized trapping) Mapping of C. m. in Bodega Harbor Intensive Removal Period (July 06-Oct 07) Focused on core sites in Bodega Harbor Assessment of progress and impacts (Aug 06, Jan, May, June 07, May, August 08): Relative abundance measures (Standardized trapping) Through all sites in Bodega Harbor and in reference bays Re-initiation of removal effort May 2008
5 Removal Methods: Intertidal/shallow subtidal Baited Traps Hand Capture Seine Habitat Traps (with Ulva, eelgrass and pipe traps) Open Coast trapping & Snorkeling
6 Removal Methods: Deep channels, neap tides Trapping (Baited and Pipe Traps) via Kayak Trawled main Channel Winter 2006
7 Trap Type CPUE % Female % Gravid % <35mm mean size (mm) *Total removed Total effort Baited Collapsible traps Baited Minnow traps Ulva Collapsible traps Ulva Minnow traps Pipe traps Seine (per 25m) transects (8 days) Hand caught Days (476 caught in 2 d) Pitfalls (daily) Snorkel (per transect) Traps in channel Trawl (per haul) days in 2007, four transects of 3 buckets each 8-50m transects, two seasons 11 days - 39 pipe, 39 baited, Feb, March, July 3 trawled transects at 1174,902,1275 meters each Year-around removal Seasonally targeted / opportunistic *additional crabs removed by similar methods
8 Assessment: Standardized Trapping 20 meters
9 C.m. caught in 10 traps June
10 Adult Crabs caught by trapping 500 Jul May-07 Jul-07 Total Crabs Removed Aug-06 Jan Jun 06 Oct 06 Feb 07 Jun 07 Oct 07 Date
11 25 Crabs per trap (baited) LOW MID SUB 20 crabs per trap Jun-06 Oct-06 Feb-07 Jun-07 Oct-07
12 Abundance of C. maenas at 250 assessment Hatched area = small crabs (<=35mm) avg # crabs / 3 days (4 sites) % 85% 0 07/ / / / /2007
13 Assessment of C. maenas at 500 Bodega and in Reference Bays avg # crabs / 3 days (4 sites) % 85% 22% 59% Jul-06 Aug-06 May-07 Jul-07 39% 53% 0 Bodega Tomales Bolinas Elkhorn
14 Abundance of Cancer crabs at 12 assessment avg # crabs / day (4 sites) Jul-06 Aug-06 Jan-07 May-07 Jul-07
15 140 Abundance of Hemigrapsus oregonensis at assessment avg # crabs / day (4 sites) Jul-06 Aug-06 Jan-07 May-07 Jul-07
16 Carapace width of H. oregonensis 24 H. oregonensis CW (mm) June 2006 June tailed t-test P < 0.001
17 Population Estimate: Mark-Release-Recapture (MRR) Wire tags Total Marked: 2,106 Carcinus Recapture: 67% of marked Tag injecting Scanning for tags
18 Mark IV wire tags Pros: Crabs are fully mobile, do not attract predators Efficient; quickly mark many crabs Detectable through molts Effective; easy to detect marks Cons: Expensive Cannot differentiate between more than two sites or dates
19 Mark Release Recapture Population size = # crabs caught N = Ct # crabs marked # crabs recaptured Mt Rt 1. marked individuals are a random sample of the population 2. they disperse at random through the entire population 3. the marking procedure does not damage them 4. none of the marks are eradicated or lost 5. the likelihood of marked individuals being captured again is independent of having once been captured, 6. mortality is negligible between the time of original release of marked individuals and the time of recapture
20 Mark Release Recapture Population size = # crabs caught N = Ct # crabs marked # crabs recaptured Mt Rt Total Marked: 2,106 Total Recapture: 1411 Total crabs caught 7/15-8/31/2006 : 7791 Estimated Population Size: 11,629 adults Current number of C. maenas (all sizes) removed from Bodega Harbor: 12,794 Current number of C. maenas adults (>35mm) removed from Bodega Harbor: 11,884
21 Mark Release Recapture Population size = # crabs caught N = Ct # crabs marked # crabs recaptured Mt Rt Total Marked: 2,106 Total Recapture: 1411 Total crabs caught 7/15-8/31/2006 : 7791 Estimated Population Size: 11,629 adults This calculation assumes that there was a single episode of marking and a single episode of recapture. Although we assume the harbor wide adult population was closed over this time period, this is a harbor wide estimate, and movement throughout the harbor is not random (very little movement between sites). More appropriate calculations for our methods could be used if we had been able to distinguish our crabs by date marked (Jolly-Seber)
22 MRR Methods
23 Elastomer Pros: Mark individuals by date and site Inexpensive Cons: ephemeral; visibility after >1 molt is possible not very strong
24 Recommendations For best population size estimates using MRR: Need daily and site release information for best population estimates Wire tags + elastomer can give you this information for all size crabs without altering mortality (due to predation or tagging method)
25 Conclusions Population of C. maenas is 85% smaller a year after removal began Since removal effort, size and abundance of H. oregonensis has increased To estimate total population size with MRR: use wire tags and elastomer To measure impact, use relative change in abundance (standard trapping measures)
26 Further removal and assessment >3 summers to see effects on Recruitment of C. maenas native populations Focus removals during summer and fall with highest abundances Use of multiple methods to target populations at different times
27 Future directions Implement removals in new embayment volunteer effort for removals Continue removals and assessment of impacts of population control We are coordinating efforts to examine recruitment strength and sources
28 Acknowledgements Caitlin Coleman-Hulbert, Becca Kordas, Celeste Dodge, India Clarke, Lindsey Budd, Brian Steves, Amanda Newsom, Jennifer Panlilio, Val Brenneis, Christina Simkanin, Chris Brown, Jelle Faber, Monaca Noble, David Kimbro, Anna Deck, Chris Bell, Basma Mohamad, Jeff Diez, Kate Huxter, Jarrett Byrnes, Josh Haakensen, Anna Coleman-Hulbert
29
30 Sex ratios 100% 80% 60% M G F 40% 20% 0% Jul Aug Jan-07 May-07 Jul-07
31 Male Gravid Female 100 Percent Compostition Jul-06 Nov-06 Mar-07 Jul-07 Nov-07
32 C or M, All sizes Total Crabs Removed Jun 06 Oct 06 Feb 07 Jun 07 Oct 07 Date
33 C or M >=35mm Total Crabs Removed Jun 06 Oct 06 Feb 07 Jun 07 Oct 07 Date
34 All traps, >=35 mm Total Crabs Removed Jun 06 Oct 06 Feb 07 Jun 07 Oct 07 Date
35 All traps, all sizes Total Crabs Removed Jun 06 Oct 06 Feb 07 Jun 07 Oct 07 Date
36 C or M, all sizes 25 MID LOw SUB 20 crabs per trap Jun-06 Oct-06 Feb-07 Jun-07 Oct-07
37 25 C or M, >-35mm MID LOW SUB 20 crabs per trap Jun-06 Oct-06 Feb-07 Jun-07 Oct-07
38 25 All Traps, >=35 mm MID LOW SUB 20 crabs per trap Jun-06 Oct-06 Feb-07 Jun-07 Oct-07
39 25 All traps, all sizes MID LOW SUB 20 crabs per trap Jun-06 Oct-06 Feb-07 Jun-07 Oct-07
40 Trap Type CPUE % Female % Gravid % <35mm mean size (mm) *Total removed Total effort Baited Collapsible traps Baited Minnow traps Ulva Collapsible traps Ulva Minnow traps Pipe traps Hand caught Days (476 caught in 2 d) Pitfalls (daily) Snorkel (per transect) Traps in channel Trawl (per haul) days in 2007, four transects of 3 buckets each 8-50m transects, two seasons 11 days - 39 pipe, 39 baited, Feb, March, July 3 trawled transects at 1174,902,1275 meters each Year-around removal Seasonally targeted / opportunistic *additional crabs removed by similar methods
41 Total Crabs caught (all methods) 500 Jul May-07 Jul-07 Total Crabs Removed Aug-06 Jan Jun 06 Oct 06 Feb 07 Jun 07 Oct 07 Date
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