|Grosholz, Edwin||University of California-Davis (UC Davis)||Principal Investigator|
|de Rivera, Catherine||Portland State University (PSU)||Co-Principal Investigator|
|Ruiz, Gregory||Portland State University (PSU)||Co-Principal Investigator|
|Rauch, Shannon||Woods Hole Oceanographic Institution (WHOI BCO-DMO)||BCO-DMO Data Manager|
Demographic data for introduced crab from multiple bays along the Central California coast, shallow subtidal (<3 m depth), in 2015.
We conducted monthly trappings of invasive European green crabs to gather demographic data from several bays in northern California: Bodega Harbor, Tomales Bay, Bolinas Lagoon, San Francisco Bay, and Elkhorn Slough. All sites were accessed by foot via shore entry. At each of four sites within each bay, we placed 5 baited traps (folding Fukui fish traps) and 5 baited minnow traps in shallow intertidal areas. Traps arrays were set with fish and minnow traps alternating and with each 20 m apart. Traps were retrieved 24 hours later and traps were rebaited and collected again the following day. Trapping was continued for three consecutive days with traps removed on the final day. Each day, data for crab species, size, sex, reproductive condition, and injuries were collected for all crabs in the field. Following data collection, all crabs were returned to the lab, and frozen overnight prior to disposal.
See Turner et al. (2016) Biological Invasions 18: 533-548 for additional methodological details:
Turner, 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 533–548. doi:10.1007/s10530-015-1026-9
Data were entered and checked in MS Excel spreadsheets. Statistical analyses were run with either (R Development Core Team) or SAS (Statistical Analysis Systems).
- re-formatted date to yyyy-mm-dd;
- modified parameter names to conform with BCO-DMO naming conventions (changed to lowercase from mixed case);
- created lat and lon columns and added values from metadata page;
- created column for full species names and added names corresponding to each code from metadata page; changed 'species' column provided to 'species_code';
- replaced blanks (missing data) with 'nd';
- replaced commas with semi-colons;
- replaced spaces with underscores.
|bay||Name of bay||unitless|
|site||Name/identifier of site within the bay||unitless|
|lat||Latitude of site||decimal degrees|
|lon||Longitude of site||decimal degrees|
|trap||Trap identifier: Fish traps = F1-10, Minnow traps = M1-10||unitless|
|species||Species or taxon||unitless|
|size||Carapace width in millimeters||millimeters (mm)|
|sex||Sex: male = M, female = F, juvenile = J, parasitized = P||unitless|
|gravid||G = indicates whether or not individual was with egg mass||unitless|
|injury||Injuries noted on the individual. Abbreviations: ML=missing leg, MC=missing claw, 2ML= two missing legs, DA=damaged abdomen, DL=damaged leg, etc.||unitless|
|Dataset-specific Instrument Name|| |
folding Fukui fish traps
|Generic Instrument Name|| |
Fukui fish trap
|Dataset-specific Description|| |
At each of four sites within each bay, we placed 5 baited traps (folding Fukui fish traps) and 5 baited minnow traps in shallow intertidal areas.
|Generic Instrument Description|| |
Fukui produces multi-species, multi-purpose collapsible or stackable fish traps, available in different sizes.
|Start Date|| |
|End Date|| |
Central California lagoon and bay sampling for the project, "RAPID: A rare opportunity to examine overcompensation resulting from intensive harvest of an introduced predator".
This document is created by info v 4.1f 5 Oct 2018 from the content of the BCO-DMO metadata database. 2020-02-19 02:11:51