We conducted tethering experiments in several northern California bays: Bodega Harbor, Tomales Bay, Bolinas Lagoon, and Seadrift Lagoon. All sites were accessed by foot via shore entry.\u00a0At each of four sites within each bay, we placed 10 small European green crabs (collected locally) in parallel arrays near the 0.0 tide level. Tethers were retrieved 24 hours later data and scored for presence/absence of crab including missing appendages and or condition of remaining tether line.
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See Turner et al. (2016) Biological Invasions 18: 533-548 for additional methodological details:
\nTurner, B.C., de Rivera, C.E., Grosholz, E.D., & Ruiz, G.M. 2016. Assessing population increase as a possible outcome to management of invasive species. Biological Invasions, 18(2), pp 533\u2013548. doi:10.1007/s10530-015-1026-9
Data were entered and checked in MS Excel spreadsheets. Statistical analyses were\u00a0run with either (R Development Core Team) or SAS (Statistical Analysis Systems).
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Note that all Seadrift sites are very close together and thus one lat/lon pair are used to represent all sites within Seadrift.
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BCO-DMO Processing:
\n- re-formatted date to yyyy-mm-dd;
\n- modified parameter names to conform with BCO-DMO naming conventions (removed units, changed to lowercase from mixed case);
\n- created lat and lon columns and added values from metadata page;\u00a0
\n- replaced commas with semi-colons and spaces with underscores;
\n- replaced blanks (missing data) with 'nd'.