Dataset: Aleutian kelp forest density data from 2008-10

Name: Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 (Kelp Forest Apex Predator Collapse project)
Published: 2017-07-24
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.712940.1

Spatial Extent: N:54.167867 E:-167.644102 S:51.406833 W:173.59089

Temporal Extent: 2008-06-02 - 2010-07-10

Project:

Collaborative Research: Kelp forest interaction webs in the Aleutian Archipelago: patterns and mechanism of change following the collapse of an apex predator (Kelp Forest Apex Predator Collapse)

Principal Investigator:

Brenda Konar (University of Alaska Fairbanks, UAF)

Co-Principal Investigator:

Matthew Edwards (San Diego State University, SDSU)

BCO-DMO Data Manager:

Mathew Biddle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2017-07-24

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 (Kelp Forest Apex Predator Collapse project)

Abstract:

Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 (Kelp Forest Apex Predator Collapse project). Data are reported as means. The kelp means come from twenty 0.25m^2 quadrats placed at each site.

Expand/Collapse All

Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2017-07-24	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.712940.1	2021-05-24

Description

Data are reported as means. The kelp means come from twenty 0.25m^2 quadrats placed at each site. The urchin means either come from twenty quadrats or fewer if 200 urchins were counted first (i.e., if 200 urchins were counted in two quadrats, then the mean only comes from these two quadrats).

Methods & Sampling

These data come from dive surveys. Depths are typically around 20 or 40 ft in rocky substrates. We randomly place twenty 0.25m^2 quadrats at each site and count and identify kelp stipes. A second diver does the same for sea urchins. If 200 urchins are counted in fewer than twenty quadrats, then we quantify fewer quadrats.

Data Processing Description

These data were stored in an access database.

BCO-DMO Processing Notes:

Added conventional header with dataset name, PI name, version date.
Modified parameter names to conform with BCO-DMO naming conventions.
Re-formatted date from dd-MON-YY to yyyymmdd.
Replaced data values of "." (period) with nd (no data).

Data Files

File
kelp_density.csv (Comma Separated Values (.csv), 29.00 KB) MD5:0f181514116094717e7e44960c6d4492 Primary data file for dataset ID 712940

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0647635

Deployments

Deployment	Start Date	Platform	Investigator
TN219	2008-05-18	R/V Thomas G. Thompson	Brenda Konar (Chief Scientist)	data info
PS1011	2010-06-24	R/V Point Sur	Brenda Konar (Chief Scientist)	data info
PS0914	2009-06-16	R/V Point Sur	Brenda Konar (Chief Scientist)	data info
Aleutian_kelp_forest_surveys_2008-2010	2008-06-02	Aleutian Islands	Brenda Konar (Chief Scientist)	data info

Instruments

Diving Mask and Snorkel

Supplied Name: scuba diver surveys

Supplied Description:

These are from scuba diver surveys.

Instrument Type

Generic Name: Diving Mask and Snorkel

Generic Description:

A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including, scuba divers, free-divers, and snorkelers to see clearly underwater.

Snorkel: A breathing apparatus for swimmers and surface divers that allows swimming or continuous use of a face mask without lifting the head to breathe, consisting of a tube that curves out of the mouth and extends above the surface of the water.

Self-Contained Underwater Breathing Apparatus

Supplied Name: scuba

Supplied Description:

These data come from dive surveys.

Instrument Type

Generic Name: Self-Contained Underwater Breathing Apparatus

Acronym: SCUBA

Generic Description:

The self-contained underwater breathing apparatus or scuba diving system is the result of technological developments and innovations that began almost 300 years ago. Scuba diving is the most extensively used system for breathing underwater by recreational divers throughout the world and in various forms is also widely used to perform underwater work for military, scientific, and commercial purposes.

Reference: http://oceanexplorer.noaa.gov/technology/diving/diving.html

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Island	name of the island where observations were taken	unitless	site
Latitude	Latitude coordinate where the sample was collected; South is negative.	decimal degrees	lat
Longitude	Longitude coordinate where the sample was collected; West is negative.	decimal degrees	lon
Date	date the observations where taken	yyyymmdd	date
Site	numerical identifier for the site at each island	unitless	site
Depth	depth of the water column where the observations were taken	feet	depth
Sea_Urchins	mean density of sea urchins	sea urchins per 0.25 square meters (\ 0.25m^2)	abundance
Eualaria_fistulosa	mean density of eualaria fistulosa	eualaria fistulosa per 0.25 square meters (\ 0.25m^2)	abundance
Laminaria_spp	mean density of Laminaria spp.	Laminaria spp. per 0.25 square meters (\ 0.25m^2)	abundance
Laminaria_yezoensis	mean density of Laminaria yezoensis	Laminaria yezoensis per 0.25 square meters (\ 0.25m^2)	abundance
Laminaria_longipes	mean density of Laminaria longipes	Laminaria longipes per 0.25 square meters (\ 0.25m^2)	abundance
Agarum_spp	mean density of Agarum spp.	Agarum spp. per 0.25 square meters (\ 0.25m^2)	abundance
Thalassiophyllum_sp	mean density of Thalassiophyllum sp.	Thalassiophyllum sp. per 0.25 square meters (\ 0.25m^2)	abundance
Cymatherea_triplicata	mean density of Cymatherea triplicata	Cymatherea triplicata per 0.25 square meters (\ 0.25m^2)	abundance

Status message

Database

Contribute Data

Dataset: Aleutian kelp forest density data from 2008-10