<div><p>The following methodology applies to this dataset in addition to other datasets published in Edmunds and Lasker (2019).</p>
<p>Sampling and analytical procedures: </p>
<p>Surveys were completed at six sites on shallow (7–9-m depth) fringing reefs on the south shore of St. John, between Cabritte Horn and White Point. In 1992, these sites were randomly selected on hard substrata along 4.5 km of shore between these headlands, and they have been censused annually to present. Each site consists of a permanently marked transect that has been 40-m long since 2000. The present project began in 2014 with the objective of augmenting a long-standing analysis of benthic community structure (which emphasized scleractinians with new analyses focused on octocorals. As part of this effort, arborescent octocorals were surveyed in situ with genus resolution, using 40 quadrats (0.5 × 0.5 m) placed at random, non-overlapping positions along the same transect (and re-randomized annually) located at each of the six sites. Surveys were completed over four weeks beginning on ~ 20th July of each of 2014–2017, and were conducted by counting and measuring the height of octocorals attached by holdfasts within each quadrat.</p>
<p>Height was determined (± 1 cm) using a flexible tape measure stretched from the holdfast to the colony apex. Abundances were analyzed separately for adults (> 5-cm tall), and recruits (≤ 5-cm tall), with this size cut-off based on the maximal height to which the recruits of most octocoral species are likely to grow in one year. While the benthos was inspected for all small octocorals, sampling efficiency probably was low for recruits consisting of only a few polyps (i.e., < 1-cm tall). Analyses testing for the effects of density dependence (DD) and self-thinning (ST) were first, completed for octocorals pooled among taxa, and second, for the three most common genera of octocorals. Evidence of DD recruitment also was sought from analyses of per capita recruitment by site, with these values obtained by dividing the density of recruits by mean density of adults.</p>
<p>For more information about statistical analyses performed using these data see Edmunds and Lasker (2019).</p></div>
<div><p>Octocoral community NMDS from surveys conducted in St. John, US Virgin Islands from 2014 to 2017. These data were used in Edmunds and Lasker (2019) Figure 3, Community non-metric multidimensional scaling (NMDS).</p>
<p>Related Datasets: all were used in Edmunds and Lasker (2019):</p>
<p>* Edmunds and Lasker MEPS 2019 Fig 1a: Density pooled taxa and one year <a href="https://www.bco-dmo.org/dataset/789128">https://www.bco-dmo.org/dataset/789128</a><br />
* Edmunds and Lasker MEPS 2019 Fig 1b: Height pooled taxa and one year <a href="https://www.bco-dmo.org/dataset/789140">https://www.bco-dmo.org/dataset/789140</a><br />
* Edmunds and Lasker MEPS 2019 Fig 2a: Density by taxon and year <a href="https://www.bco-dmo.org/dataset/789145">https://www.bco-dmo.org/dataset/789145</a><br />
* Edmunds and Lasker MEPS 2019 Fig 2b: Height by taxon and year <a href="https://www.bco-dmo.org/dataset/789149">https://www.bco-dmo.org/dataset/789149</a><br />
* Edmunds and Lasker MEPS 2019 Fig 3: Community NMDS <a href="https://www.bco-dmo.org/dataset/789181">https://www.bco-dmo.org/dataset/789181</a><br />
* Edmunds and Lasker MEPS 2019 Fig S1: Sampling effort <a href="https://www.bco-dmo.org/dataset/789188">https://www.bco-dmo.org/dataset/789188</a><br />
* Edmunds and Lasker MEPS 2019 Fig S3: Sampling effort, juveniles <a href="https://www.bco-dmo.org/dataset/789195">https://www.bco-dmo.org/dataset/789195</a><br />
* Edmunds and Lasker MEPS 2019 Fig S4: Colony sizes <a href="https://www.bco-dmo.org/dataset/789202">https://www.bco-dmo.org/dataset/789202</a><br />
* Edmunds and Lasker MEPS 2019 Fig S5a: Density <a href="https://www.bco-dmo.org/dataset/789210">https://www.bco-dmo.org/dataset/789210</a><br />
* Edmunds and Lasker MEPS 2019 Fig S5b: Height <a href="https://www.bco-dmo.org/dataset/789217">https://www.bco-dmo.org/dataset/789217</a></p></div>
Edmunds and Lasker MEPS 2019 Fig 3: Community NMDS
<div><p>BCO-DMO Data Manager Processing Notes:<br />
* Originally submitted data as an Excel File with multiple tables in multiple sheets imported into the BCO-DMO data system so it could be adequately described and provided to the public in various open data formats. The original Excel file was attached to each dataset landing page as a supplemental document.</p>
<p>Data version 1: Changes made between original Excel sheet and what was imported into the BCO-DMO data system:<br />
* Sheet "split" view removed.<br />
* Sheet "Fig 3" of the original excel sheet exported as csv<br />
* Column names modified to fit BCO-DMO naming conventions designed for interoperability and data reuse (e.g. no spaces, special characters).</p></div>
789181
Edmunds and Lasker MEPS 2019 Fig 3: Community NMDS
2020-02-04T14:07:33-05:00
2020-02-04T14:07:33-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:789181
Octocoral colony density by pooled taxa, site, and quadrat from surveys conducted in St. John, US Virgin Islands from 2014 to 2017
Octocoral community NMDS from surveys conducted in St. John, US Virgin Islands from 2014 to 2017. These data were used in Edmunds and Lasker (2019) Figure 3, Community non-metric multidimensional scaling (NMDS).
false
Edmunds, P., Lasker, H. (2020) Octocoral colony density by pooled taxa, site, and quadrat from surveys conducted in St. John, US Virgin Islands from 2014 to 2017. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-02-04 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.789181.1 [access date]
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