Dataset: urchin grazing

Name: Percent algal substrate grazed by sea urchins in trophic cascade experiments in Gal?pagos Islands during 2012 (GMR Trophic Cascades project)
Published: 2016-01-19
Keywords: biota, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.635717.1

Spatial Extent: N:-0.411 E:-90.27525 S:-0.411 W:-90.27525

Temporal Extent: 2012-06 - 2012-07

Project:

Effects of Predator Diversity on the Strength of Trophic Cascades in an Oceanic Benthic Ecosystem (GMR Trophic Cascades)

Principal Investigator:

Jon D. Witman (Brown University)

Scientist:

Franz Smith (Brown University)

Contact:

Franz Smith (Brown University)

Jon D. Witman (Brown University)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2016-01-19

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Percent algal substrate grazed by sea urchins in trophic cascade experiments in Gal?pagos Islands during 2012 (GMR Trophic Cascades project)

Abstract:

Percent algal substrate grazed by sea urchins in trophic cascade experiments in Gal?pagos Islands during 2012.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2016-01-19	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.635717.1	2021-04-01

Methods & Sampling

Data describe the percent algal substrate grazed by sea urchins in trophic cascade experiment. Treatments included full predator exclusion with 4 urchins and predator access (fence with 4 urchins) for two species of urchin (Eucidaris galapagensis and Lytechinus semituberculatus) conducted on 23 June – 1 July 2012 and 13 – 20 July 2012, respectively. Experimental concrete bases were photographed and digitized for percent cover of grazed substrate. Experiments were conducted at 10 m depth at Baltra Island, Galápagos Islands.

See Witman, J.D., et al (2015) for description of the experimental design.

Data Processing Description

Data are raw, with no processing.

BCO-DMO Processing:

- added conventional header with dataset name, PI name, version date, reference information
- renamed parameters to BCO-DMO standard
- replaced blanks with underscores
- reformatted data to a flat file
- added site, lat, lon columns

Data Files

File
urchin_grazing.csv (Comma Separated Values (.csv), 1.95 KB) MD5:8830a33a44dc8aa870d153fd31e9b0c9 Primary data file for dataset ID 635717

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1061475

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
Witman_2012		2012-01-01	Unknown Platform		data info

Instruments

Camera

Supplied Name:

Supplied Description:

GoPro digital video camera

Instrument Type

Generic Name: Camera

Acronym: camera

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/311/

Generic Description:

All types of photographic equipment including stills, video, film and digital systems.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
days	duration of experiment	days	days
lat	latitude; north is positive	decimal degrees	lat
lon	lonitude; east is positive	decimal degrees	lon
pcent_grazed	percent of area grazed	percent	no_bcodmo_term
site	location of experiment	unitless	site
species	experimental sea urchin taxonomic name	unitless	species
treatment	description of treatment	unitless	treatment

Status message

Database

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Dataset: urchin grazing