<div><p>Sampling and analytical procedures for habitat complexity photos and related datasets:</p>
<div>At each site, we sampled two rocky intertidal areas (usually one on either side of a beach or headland and separated by approximately 100 meters) during low tide (usually less than -0.8 feet), using quadrats to estimate abundances of Pisaster ochraceus, Cryptochiton stelleri, Leptasterias sp., and Henricia pumila. We exhaustively searched 20–32 one-meter square quadrats per site (i.e. 10–16 per each of 2 areas), recording GPS waypoint, time, and abundances and sizes of the target species for each quadrat. Each quadrat was photographed. Quadrat locations were selected by first finding one of the target habitat types—surf grass, low-zone red algae, coralline turf, cobble or boulder field, or urchin pools with pits either empty or occupied—selecting a starting point haphazardly, and then using a random numbers table (range of 1–10 meters) to choose remaining quadrat locations. All quadrats and specimens were georeferenced using a Garmin C60X GPS (±3 m precision). The accuracy of the GPS in meters at the time the waypoint was recorded can be found in column "GPS_Accuracy" of the "Quadrat data" dataset. Tissues samples are preserved in 95% Ethanol and stored at -20 degrees C. A subset of tissue samples are also preserved in RNA Later and stored at -20 degrees C (as indicated in the "Quadrat data" dataset). </div>
<div> </div>
<div>Problem report for data between 2018-12-21 and 2019-07-06: In Strongylocentrotus purpuratus were only counted in the first quadrant (0.25 x 0.25m) of each quadrat (1m2), so the total search area for that species is one quarter that of other species and so the density should be calculated accordingly.
<p>Species list (<span style="font-size:13px">taxonomic_name,AphiaID,LSID)</span>:<br />
</p>
<div><span style="font-size:13px">Cryptochiton stelleri,240776,urn:lsid:marinespecies.org:taxname:240776</span></div>
<div>
<div><span style="font-size:13px">Dermasterias,240770,urn:lsid:marinespecies.org:taxname:240770</span></div>
<div><span style="font-size:13px">Dermasterias imbricata,240771,urn:lsid:marinespecies.org:taxname:240771</span></div>
<div><span style="font-size:13px">Henricia leviuscula,369117,urn:lsid:marinespecies.org:taxname:369117</span></div>
<div><span style="font-size:13px">Henricia pumila,467966,urn:lsid:marinespecies.org:taxname:467966</span></div>
<div><span style="font-size:13px">Henricia sp,123276,urn:lsid:marinespecies.org:taxname:123276</span></div>
<div><span style="font-size:13px">Leptasterias sp.,123222,urn:lsid:marinespecies.org:taxname:123222</span></div>
<div><span style="font-size:13px">Patiria miniata,382131,urn:lsid:marinespecies.org:taxname:382131</span></div>
<div><span style="font-size:13px">Pisaster ochraceus,240755,urn:lsid:marinespecies.org:taxname:240755</span></div>
<div><span style="font-size:13px">Strongylocentrotus franciscanus,240762,urn:lsid:marinespecies.org:taxname:240762</span></div>
<div><span style="font-size:13px">Strongylocentrotus purpuratus,240747,urn:lsid:marinespecies.org:taxname:24074</span></div>
</div>
<p>
* Strongylocentrotus franciscanus (AphiaID 240762) is currently the unaccepted synonym. The matching accepted name as of 2022-02-01 is Mesocentrotus franciscanus (AphiaID 591102).</p></div></div>
<div><p>This page serves the "Quadrat counts" dataset. See "Related Datasets" section for access to the other data types mentioned in the study data description below and the Methods & Sampling section.</p>
<p>Study data description:</p>
<p>Abundances and sizes of target invertebrates in quadrat surveys; photos of habitat complexity and a subset of specimens; and GPS coordinates of quadrats.</p></div>
Quadrat counts
<div><p>Data were transcribed from field notes, error-checked, and verified that tissue collections matched up to notes.<br />
</p></div>
751650
Quadrat counts
2018-12-28T16:50:49-05:00
2018-12-28T16:50:49-05:00
2024-02-28T14:39:30-05:00
urn:bcodmo:dataset:751650
* Data submitted in 75 Excel files (e.g. Quadrat_181221_MCM_Area1_LMS.xlsx) with sheets named "Counts" was exported as csv and imported into the BCO-DMO data system. All data concatenated into one table.
* Columns Date, Site_Code, Area_Number from information in the source file names.
* Parameters (column names) renamed to comply with BCO-DMO naming conventions. See https://www.bco-dmo.org/page/bco-dmo-data-processing-conventions
* Date format converted to ISO 8601 date format yyyy-mm-dd
* Commas in "Notes" changed to semicolons to support csv export from the BCO-DMO data system.
* Columns named "Area" renamed to Quadrat_Area (see parameter descriptions).
* lat and lon columns for the waypoints added to this the dataset from the "GPS waypoints" data using the waypoint ID, date, and area number to join the data tables.
Data version 2 replaced data version 1 on 2022-02-01.
* Data version 2 adds additional data from 2019-2020. Processed the same way as v1.
* Species column was a mix of taxonomic names and species codes. Definition of column was "species identification shorthand: S = Strongylocentrotus purpuratus, P = Pisaster ochraceus, C = Cryptochiton stelleri, L = Leptasterias sp., H = Henricia pumila; if other species were recorded their full name is written out". These codes were replaced with the full name in the dataset.
* Taxonomic names checked using the World Register of Marine Species Taxa Match tool on 2022-02-01. All names matched a known name exactly. Though one matched an unaccepted synonym. Details added to metadata.
Dataset version 3 adds data for 2020-2021.
Quadrat species counts and measurements along the Northern Central California coast from 2017 to 2021
Quadrat species counts and measurements collected concurrently with habitat complexity photos along the Northern Central California coast from 2017 to 2021.
false
Northern Central California coast, ~36–39 N
Dawson, M. N., Schiebelhut, L. (2024) Quadrat species counts and measurements along the Northern Central California coast from 2017 to 2021. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 3) Version Date 2024-02-29 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/751650 [access date]
false
3
false
abundance
California
demography
echinoderm
gene flow
genetic drift
intertidal
invertebrate
mass mortality
population genetics
population genomics
sea star wasting disease
selection
2024-02-29
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