http://lod.bco-dmo.org/id/dataset/712940
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2017-08-17
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 (Kelp Forest Apex Predator Collapse project)
2017-07-24
publication
2017-07-24
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2021-05-24
publication
https://doi.org/10.26008/1912/bco-dmo.712940.1
Brenda Konar
University of Alaska Fairbanks
principalInvestigator
Matthew Edwards
San Diego State University
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Konar, B., Edwards, M. (2021) Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 (Kelp Forest Apex Predator Collapse project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2017-07-24 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.712940.1 [access date]
Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 Dataset Description: <p>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).</p> Methods and Sampling: <p>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.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-0647635 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=0647635
completed
Brenda Konar
University of Alaska Fairbanks
9074745028
College of Fisheries and Ocean Sciences
Fairbanks
AK
99709
bhkonar@alaska.edu
pointOfContact
Matthew Edwards
San Diego State University
Department of Biology San Diego State University
San Diego
CA
92182
USA
medwards@mail.sdsu.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Island
Latitude
Longitude
Date
Site
Depth
Sea_Urchins
Eualaria_fistulosa
Laminaria_spp
Laminaria_yezoensis
Laminaria_longipes
Agarum_spp
Thalassiophyllum_sp
Cymatherea_triplicata
scuba diver surveys
scuba
theme
None, User defined
site
latitude
longitude
date
depth
abundance
featureType
BCO-DMO Standard Parameters
Diving Mask and Snorkel
Self-Contained Underwater Breathing Apparatus
instrument
BCO-DMO Standard Instruments
Aleutian_kelp_forest_surveys_2008-2010
TN219
PS0914
PS1011
service
Deployment Activity
Aleutian Islands
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Collaborative Research: Kelp forest interaction webs in the Aleutian Archipelago: patterns and mechanism of change following the collapse of an apex predator
https://osprey.bco-dmo.org/project/2173
Collaborative Research: Kelp forest interaction webs in the Aleutian Archipelago: patterns and mechanism of change following the collapse of an apex predator
<p>NSF abstract:</p>
<p>Research on sea otters and kelp forest ecosystems conducted over the past 35 years provides one of the better known examples of top-down forcing by a large vertebrate predator. These studies have shown that 1) sea otters indirectly maintain kelp forests by limiting herbivorous sea urchins, and 2) this trophic cascade has strong indirect effects on a number of other species and ecosystem processes. These insights were obtained largely through the comparison of islands in the Aleutian archipelago with and without sea otters, an opportunity created by the spatially asynchronous population recovery of sea otters following their decimation by the Pacific maritime fur trade.</p>
<p>In the course of more than 35 years of studies, these researchers have obtained an extensive amount of data on sea otter populations, kelp forest communities, and an array of associated marine wildlife from numerous Aleutian Islands with and without sea otters. Sea otter populations have since collapsed and the species is now ecologically extinct across the entire region. In this study, Drs. Konar, Edwards and Estes will combine the multi-decadal database with this extinction event to chronicle the patterns and mechanisms of spatial and temporal change in distributions and abundances of sea urchins and fleshy macroalgae (kelps and other species). They will do this by revisiting 20 islands for which they have long-term data and re-censusing the historical kelp forest monitoring sites for the abundance and population structure of sea urchins, and for the abundance and species composition of kelps and other fleshy macroalgae. In combination, these data will provide an account of the degree to which the otter-urchin kelp trophic cascade has changed with the collapse of sea otters across the Aleutian archipelago.</p>
<p>The available information indicates that kelp forests collapsed very rapidly following the sea otter decline, and that this rapid shift was facilitated by the upward migration of sea urchins from deep water as opposed to in situ recruitment and growth. This group of marine scientists will test this idea by measuring various temperature- and nutrient sensitive isotopic patterns along the growth increment of sea urchin spines of animals collected from shallow and deep water. Similar to a depth refuge for urchins, studies from other areas have suggested that macroalgae may have a spatial refuge from urchin grazing in shallow waters or amongst very dense algal stands. They will explore macroalgal spatial refuges by using data collected during the re-censusing of the kelp forest monitoring sites and by extending our surveys to shallower waters and isolated kelp beds.</p>
<p>This research is an opportunity to rigorously explore and document the influences of a large vertebrate predator on the interaction web dynamics of its associated ecosystem. The intellectual merit of this project emphasizes the special character of oceanic islands and the Arctic for the study of near-shore ecosystem structure and processes.</p>
<p>Broader impacts of this project include benefits to society, teaching, and training. The project will be very newsworthy because it will describe the current status of a rapidly declining marine mammal and will document changes that have occurred due to fluctuations in the abundance of this species over the last 20+ years. Training and educational opportunities will be offered to graduate students from three different universities. The project will involve the University of Alaska Fairbanks, University of California Santa Cruz, and San Diego State University.</p>
Kelp Forest Apex Predator Collapse
largerWorkCitation
project
eng; USA
oceans
Aleutian Islands
173.59089
-167.644102
51.406833
54.167867
2008-06-02
2010-07-10
Pacific coast (Alaska to Baja California). Aleutian Archipelago
0
BCO-DMO catalogue of parameters from Kelp and urchin mean densities from Aleutian habitat surveys 2008-2010 (Kelp Forest Apex Predator Collapse project)
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/712964.rdf
Name: Island
Units: unitless
Description: <p>name of the island where observations were taken</p>
http://lod.bco-dmo.org/id/dataset-parameter/712965.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Latitude coordinate where the sample was collected; South is negative.</p>
http://lod.bco-dmo.org/id/dataset-parameter/712966.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Longitude coordinate where the sample was collected; West is negative.</p>
http://lod.bco-dmo.org/id/dataset-parameter/712967.rdf
Name: Date
Units: yyyymmdd
Description: <p>date the observations where taken</p>
http://lod.bco-dmo.org/id/dataset-parameter/712968.rdf
Name: Site
Units: unitless
Description: <p>numerical identifier for the site at each island</p>
http://lod.bco-dmo.org/id/dataset-parameter/712969.rdf
Name: Depth
Units: feet
Description: <p>depth of the water column where the observations were taken</p>
http://lod.bco-dmo.org/id/dataset-parameter/712970.rdf
Name: Sea_Urchins
Units: sea urchins per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of sea urchins</p>
http://lod.bco-dmo.org/id/dataset-parameter/712971.rdf
Name: Eualaria_fistulosa
Units: eualaria fistulosa per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of eualaria fistulosa</p>
http://lod.bco-dmo.org/id/dataset-parameter/712972.rdf
Name: Laminaria_spp
Units: Laminaria spp. per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of Laminaria spp.</p>
http://lod.bco-dmo.org/id/dataset-parameter/712973.rdf
Name: Laminaria_yezoensis
Units: Laminaria yezoensis per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of Laminaria yezoensis</p>
http://lod.bco-dmo.org/id/dataset-parameter/712974.rdf
Name: Laminaria_longipes
Units: Laminaria longipes per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of Laminaria longipes</p>
http://lod.bco-dmo.org/id/dataset-parameter/712975.rdf
Name: Agarum_spp
Units: Agarum spp. per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of Agarum spp.</p>
http://lod.bco-dmo.org/id/dataset-parameter/712976.rdf
Name: Thalassiophyllum_sp
Units: Thalassiophyllum sp. per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of Thalassiophyllum sp.</p>
http://lod.bco-dmo.org/id/dataset-parameter/712977.rdf
Name: Cymatherea_triplicata
Units: Cymatherea triplicata per 0.25 square meters (\ 0.25m^2)
Description: <p>mean density of Cymatherea triplicata</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
29701
https://darchive.mblwhoilibrary.org/bitstream/1912/27165/1/dataset-712940_aleutian-kelp-forest-density-data-2008-10__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.712940.1
download
onLine
dataset
<p>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.</p>
Specified by the Principal Investigator(s)
<p>These data were&nbsp;stored in an access database.</p>
<p><strong>BCO-DMO Processing Notes:</strong></p>
<p>Added conventional header with dataset name, PI name, version date.<br />
Modified parameter names to conform with BCO-DMO naming conventions.<br />
Re-formatted date from dd-MON-YY to yyyymmdd.<br />
Replaced data values of "." (period) with nd (no data).</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
scuba diver surveys
scuba diver surveys
PI Supplied Instrument Name: scuba diver surveys PI Supplied Instrument Description:These are from scuba diver surveys. Instrument Name: Diving Mask and Snorkel Instrument Short Name: Instrument 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.
scuba
scuba
PI Supplied Instrument Name: scuba PI Supplied Instrument Description:These data come from dive surveys. Instrument Name: Self-Contained Underwater Breathing Apparatus Instrument Short Name:SCUBA Instrument 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: https://oceanexplorer.noaa.gov/technology/technical/technical.html
Deployment: Aleutian_kelp_forest_surveys_2008-2010
Aleutian_kelp_forest_surveys_2008-2010
Aleutian Islands
island
Aleutian_kelp_forest_surveys_2008-2010
Brenda Konar
University of Alaska Fairbanks
Cruise: TN219
TN219
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
TN219
Brenda Konar
University of Alaska Fairbanks
Cruise: PS0914
PS0914
R/V Point Sur
Community Standard Description
International Council for the Exploration of the Sea
R/V Point Sur
vessel
PS0914
Brenda Konar
University of Alaska Fairbanks
Cruise: PS1011
PS1011
R/V Point Sur
Community Standard Description
International Council for the Exploration of the Sea
R/V Point Sur
vessel
PS1011
Brenda Konar
University of Alaska Fairbanks
Aleutian Islands
island
R/V Thomas G. Thompson
Community Standard Description
International Council for the Exploration of the Sea
R/V Thomas G. Thompson
vessel
R/V Point Sur
Community Standard Description
International Council for the Exploration of the Sea
R/V Point Sur
vessel