Dataset: Crab Tethering
Deployment: Grosholz

Tethering data for introduced crab for 2015

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)

Current State:

Final no updates expected

Version:

15 June 2017

Version Date:

2017-06-15

Data URL:

https://www.bco-dmo.org/dataset-deployment/704873/data

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Description

Tethering data for introduced crab for 2015. Experiments were conducted in several bays along Central California coast, shallow subtidal (<3 m depth).

Methods & Sampling

Dataset acquisition description

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. At 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.

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 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).

Note that all Seadrift sites are very close together and thus one lat/lon pair are used to represent all sites within Seadrift.

BCO-DMO Processing:
- re-formatted date to yyyy-mm-dd;
- modified parameter names to conform with BCO-DMO naming conventions (removed units, changed to lowercase from mixed case);
- created lat and lon columns and added values from metadata page;
- replaced commas with semi-colons and spaces with underscores;
- replaced blanks (missing data) with 'nd'.

More information about this dataset deployment

Funding

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

Instruments

None available yet

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
bay	Name of bay	unitless	site
site	Name/identifier of the site within the bay	unitless	site
lat	Latitude of the site	decimal degrees	lat
lon	Longitude of the site	decimal degrees	lon
date_collected	Date retrieved (yyyy-mm-dd)	unitless	date
size	Carapace width in millimeters	millimeters (mm)	width
sex	Sex: M=male, F=female, P=parasitized	unitless	sex
outcome	Condition of crab and tether after retrieval: Undamaged = intact, no evidence of predation; ML = missing legs; Predation = evidence of predation; Escape = evidence that tether failed; Loop = tether loop still intact.	unitless	no_bcodmo_term

Database

Contribute Data

Dataset: Crab Tethering
Deployment: Grosholz

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Crab TetheringDeployment: Grosholz

Dataset acquisition description

Dataset Processing Description

Dataset: Crab Tethering
Deployment: Grosholz