Dataset: Monthly Trapping
Deployment: Grosholz

Demographic data from introduced crab in Seadrift Lagoon 2009-2019

Principal Investigator:

Edwin Grosholz (University of California-Davis, UC Davis)

Co-Principal Investigator:

Catherine de Rivera (Portland State University, PSU)

Gregory E. Ruiz (Portland State University, PSU)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

RAPID: A rare opportunity to examine overcompensation resulting from intensive harvest of an introduced predator (Invasive_predator_harvest)

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/704876/data

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Description

Demographic data from introduced crab in Seadrift Lagoon (Central California coast, shallow subtidal (<3 m depth)) from 2009 to 2019.

Methods & Sampling

Dataset acquisition description

We conducted monthly trapping of invasive European green crabs to gather demographic data in Seadrift Lagoon, Stinson Beach, CA (lat 37.907440 long -122.666169). All sites were accessed by either kayak or by foot via shore entry. At each of six sites, we placed 10 baited traps (folding Fukui fish traps) in shallow (<2 m) subtidal areas. Traps were retrieved 24 hours later and 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, injuries, and presence of marks were collected for all crabs in the field. Following data collection, all crabs were returned to the lab, frozen overnight disposed of in commercial agricultural compost.

See Turner et al. (2016) for additional methodological details.

Data Processing Description

Dataset Processing Description

Data were entered and checked in MS Excel spreadsheets. Statistical analyses were run with either (R Development Core Team) or SAS (Statistical Analysis Systems).

BCO-DMO Processing:
v1 (2017-06-02):
- converted date to YYYY-MM-DD format;
- modified parameter names to conform with BCO-DMO naming conventions (changed to lowercase from mixed case, replaced spaces with underscores);
- created column for full species names and added names corresponding to each code from metadata page; changed 'species' column provided to 'species_code';
- replaced commas with semi-colons;
- replaced blanks (missing data) with 'nd';
- replaced spaces with underscores;
- sorted by date, site, then size.

v2 (2021-03-16):
- replaced version 1 of dataset with version 2, which includes a longer time series of data;
- replaced commas with semi-colons in the injury and recap_mark columns;
- converted date to YYYY-MM-DD format;
- replaced invalid values in sex and size columns with 'nd'.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1514893	NSF Division of Ocean Sciences

Instruments

Fukui fish trap

Supplied Name: Fukui fish traps

Supplied Description:

At each of the six sites used for monthly trapping plus three additional sites, we placed 15 baited traps (folding Fukui fish traps) in shallow (<2 m) subtidal areas.

Instrument Type

Generic Name: Fukui fish trap

Generic Description:

Fukui produces multi-species, multi-purpose collapsible or stackable fish traps, available in different sizes.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
lagoon	Name of the site	unitless	site
lat	Latitude of Seadrift Lagoon	decimal degrees	lat
lon	Longitude of Seadrift Lagoon	decimal degrees	lon
date	Date (yyyy-mm-dd)	unitless	date
site	Name/identifier of site	unitless	site
size	Carapace width in millimeters	millimeters (mm)	width
sex	Sex: M = male, F = female = F, P = feminized male due to parasite infection	unitless	sex
gravid	G = indicates an egg mass was present	unitless	sample_descrip
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	sample_descrip
recap_mark	Refers to mark-recapture markings. Pairs of antereo-lateral spines (indexed 1-10) that had been removed by clipping a pair of spines as a 'mark' either spines 1,2 or 9,10.	unitless	sample_descrip
species_code	Species identifier/code	unitless	taxon_code
species	Species or taxon	unitless	taxon

Database

Contribute Data

Dataset: Monthly Trapping
Deployment: Grosholz

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Monthly TrappingDeployment: Grosholz

Dataset acquisition description

Dataset Processing Description

Dataset: Monthly Trapping
Deployment: Grosholz