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Dataset Title:  Octocoral species abundance during transect surveys at four sites on the south
shore of St. John, US Virgin Islands from November to December 2017
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_751176)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Subset | Files | Make a graph
 
Variable ?   Optional
Constraint #1 ?
Optional
Constraint #2 ?
   Minimum ?
   or a List of Values ?
   Maximum ?
 
 Site (unitless) ?          "Booby_Rock"    "Tektite"
 latitude (degrees_north) ?          18.30293333    18.31671667
  < slider >
 longitude (degrees_east) ?          -64.72993333    -64.71043333
  < slider >
 Census_Year (unitless) ?      
   - +  ?
 Date (unitless) ?          20171120    20171201
 Transect_Position (meters (m)) ?          0    50
 Side_of_transect (unitless) ?          "L"    "R"
 Meter_on_transect (meters (m)) ?          0    9
 Species_code (unitless) ?          "NaN"    "pw"
 Height_of_living_tissue (centimeters (cm)) ?          2    108
 Total_Height (centimeters (cm)) ?          4    108
 Genus_Species (unitless) ?          "Antillogorgia acer..."    "Pterogorgia guadal..."
 Genus (unitless) ?          "Antillogorgia"    "Pterogorgia"
 Species (unitless) ?          "NaN"    "wagenaari"
 Comments_1 (unitless) ?          "1 C. gibbosum"    "very damaged"
 Comments_2 (unitless) ?          151    159
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Site {
    String bcodmo_name "site";
    String description "Census locations";
    String long_name "Site";
    String units "unitless";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range 18.30293333, 18.31671667;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "latitude in degrees north";
    String ioos_category "Location";
    String long_name "Latitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -64.72993333, -64.71043333;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "longitude in degrees east";
    String ioos_category "Location";
    String long_name "Longitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Census_Year {
    Float32 _FillValue NaN;
    Float32 actual_range 2017.11, 2017.11;
    String bcodmo_name "year";
    String description "Census Year";
    String long_name "Census Year";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/";
    String units "unitless";
  }
  Date {
    Int32 _FillValue 2147483647;
    Int32 actual_range 20171120, 20171201;
    String bcodmo_name "date";
    String description "Day - Month - Year on which data were collected.";
    String long_name "Date";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String units "unitless";
  }
  Transect_Position {
    Byte _FillValue 127;
    Byte actual_range 0, 50;
    String bcodmo_name "transect";
    String description "Transects positioned in a marked 50x10m area with stainless steel eye bolts marking each corner and each of the 6 transect. Transects were 10m long across the 50x10m area. So there were 0m; 10m; 20m; 30m; 40m; 50m.";
    String long_name "Transect Position";
    String units "meters (m)";
  }
  Side_of_transect {
    String bcodmo_name "site_descrip";
    String description "Side of the transect tape (Left or Right) orientation looking towards open ocean with the nearest shore to the back.";
    String long_name "Side Of Transect";
    String units "unitless";
  }
  Meter_on_transect {
    Byte _FillValue 127;
    Byte actual_range 0, 9;
    String bcodmo_name "transect";
    String description "From 0m to 9m.  1x1m quadrats were positioned randomly along the 10 m transect. The values refer to the position of the \"shoreward\" corner of the quadrat.  Thus \"0\"refers to the quadrat placed between the 0 and 1 meter marks";
    String long_name "Meter On Transect";
    String units "meters (m)";
  }
  Species_code {
    String bcodmo_name "species";
    String description "Octocorals species acronyms. Field identifications of Pseudoplexaura flagellosa and P. wagenaari  are difficult among small colonies and for analysis purposes the two species should be lumped as a single group. Field identifications of Eunicea mammosa E. laxispica and E. succinea  are sometimes difficult s and for analysis purposes the two species should be lumped as a single group. LINES WITH NO SPECIES ENTRY IDENTIFY QUADRATS IN WHICH NO OCTOCORALS WERE PRESENT-  This is also noted in the comments as \"No colonies present\"";
    String long_name "Species Code";
    String units "unitless";
  }
  Height_of_living_tissue {
    Byte _FillValue 127;
    Byte actual_range 2, 108;
    String bcodmo_name "height";
    String description "Maximum distance from the base of the octocoral colony until the farthest tips of the longest branch with living tissue   (i.e. not necessarily perpendicular to the substrate).  All measures rounded to the nearest cm with the exception of 5 cm which only includes colonies >= 5 cm.  Measures less than 5 cm reflect colonies with thick branches which could only have";
    String long_name "Height Of Living Tissue";
    String units "centimeters (cm)";
  }
  Total_Height {
    Byte _FillValue 127;
    Byte actual_range 4, 108;
    String bcodmo_name "height";
    String description "total height";
    String long_name "Total Height";
    String units "centimeters (cm)";
  }
  Genus_Species {
    String bcodmo_name "species";
    String description "Full species name";
    String long_name "Genus Species";
    String units "unitless";
  }
  Genus {
    String bcodmo_name "genus";
    String description "Genus name";
    String long_name "Genus";
    String units "unitless";
  }
  Species {
    String bcodmo_name "species";
    String description "Species name";
    String long_name "Species";
    String units "unitless";
  }
  Comments_1 {
    String bcodmo_name "unknown";
    String description "Comments. C. gibbosum denotes the presence of Cyphoma giibbosum a grazing snail that strips living tissue from octocoral colonies.";
    String long_name "Comments 1";
    String units "unitless";
  }
  Comments_2 {
    Int16 _FillValue 32767;
    Int16 actual_range 151, 159;
    String bcodmo_name "unknown";
    String description "Numbers refer to sample numbers of 4 cm dried tissue specimens collected for species identification.";
    String long_name "Comments 2";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
    String acquisition_description 
"Survey design:  
 All sites were located at 6 to 9 meters depth.\\u00a0
 
Censuses at East Cabritte, Europa and Tektite were based on 50x10m areas that
were arbitrarily selected and permanently marked with stainless steel eyebolts
at the corners of the sites.\\u00a0 A total of six transect lines, also marked
with eyebolts, were laid out at 10 m intervals. All octocorals present in 1 x
1 m quadrats along the 10-meter long transects were scored. In 2014 ten
quadrats were surveyed along each line.\\u00a0 In 2015 and 2016 ten quadrats
were scored along each transect line at Europa and Tektite and five randomly
chosen quadrats were surveyed at East Cabritte.\\u00a0 The transect identifier
\\\"transect_pos\\\" has values 0, 10, 20, 30, 40 or 50 which represent position
in meters within the 50x10 survey area corresponding to each of the 6
transects (e.g. 20 = 20m).\\u00a0\\u00a0
 
The census at Booby Rock was conducted in a single day in which 2 transects
were randomly placed along a 50 m line that was arbitrarily placed on a
constant depth contour.\\u00a0 Only 4 1x1 m quadrats were surveyed along each
transect. The transect identifier (transect_pos) for transects at Booby Rock
refers to position along the 50 m line.
 
Sampling methods:  
 Identifications were based on traits visible in the field, and samples of
representative colonies were collected for further analysis in cases in which
field identification was uncertain.\\u00a0 Sclerites from those samples were
examined for species identification.
 
Colony heights were measured as the maximum distance from the base of the
octocoral colony until the farthest tips of the branch (i.e. not necessarily
perpendicular to the substrate).\\u00a0 All measures rounded to the nearest cm
with the exception of 5 cm which only includes colonies >= 5 cm.\\u00a0
Starting in 2016, measures less than 5 cm reflect colonies with thick branches
which could only have <5 cm heights due to partial mortality.
 
Two height measures are present, height of living tissue, which only includes
that part of the axis with living tissue and total height which is the
distance from the base to the tip of the tallest branch regardless of whether
the tips or base had living tissue.\\u00a0 (Only colonies with some living
tissue were measured).
 
Species names for field_codes in this dataset\\u00a0can be found in the related
dataset: [https://www.bco-dmo.org/dataset/733063](\\\\\"https://www.bco-
dmo.org/dataset/733063\\\\\")
 
These data are a continuation of BCO-DMO project \\\"Ecology and functional
biology of octocoral communities\\\" ([http://www.bco-
dmo.org/project/562086](\\\\\"https://www.bco-dmo.org/project/562086\\\\\"))";
    String awards_0_award_nid "749652";
    String awards_0_award_number "OCE-1801475";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1801475";
    String awards_0_funder_name "NSF Division of Ocean Sciences";
    String awards_0_funding_acronym "NSF OCE";
    String awards_0_funding_source_nid "355";
    String awards_0_program_manager "Daniel Thornhill";
    String awards_0_program_manager_nid "722161";
    String cdm_data_type "Other";
    String comment 
"Transect surveys of octocoral species abundance 
  PI: Howard Lasker 
  Version: 2018-11-10";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_type "institution";
    String creator_url "https://www.bco-dmo.org/";
    String data_source "extract_data_as_tsv version 2.3  19 Dec 2019";
    String date_created "2018-12-18T14:58:33Z";
    String date_modified "2019-11-04T20:08:16Z";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.1575/1912/bco-dmo.751176.1";
    Float64 Easternmost_Easting -64.71043333;
    Float64 geospatial_lat_max 18.31671667;
    Float64 geospatial_lat_min 18.30293333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -64.71043333;
    Float64 geospatial_lon_min -64.72993333;
    String geospatial_lon_units "degrees_east";
    String history 
"2021-06-19T09:09:48Z (local files)
2021-06-19T09:09:48Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_751176.html";
    String infoUrl "https://www.bco-dmo.org/dataset/751176";
    String institution "BCO-DMO";
    String keywords "bco, bco-dmo, biological, census, Census_Year, chemical, code, comments, Comments_1, Comments_2, data, dataset, date, dmo, erddap, genus, Genus_Species, height, Height_of_living_tissue, latitude, living, longitude, management, meter, Meter_on_transect, oceanography, office, position, preliminary, side, Side_of_transect, site, species, Species_code, tissue, total, Total_Height, transect, Transect_Position, year";
    String license "https://www.bco-dmo.org/dataset/751176/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/751176";
    Float64 Northernmost_Northing 18.31671667;
    String param_mapping "{'751176': {'lat': 'flag - latitude', 'lon': 'flag - longitude'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/751176/parameters";
    String people_0_affiliation "State University of New York at Buffalo";
    String people_0_affiliation_acronym "SUNY Buffalo";
    String people_0_person_name "Howard Lasker";
    String people_0_person_nid "562092";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Woods Hole Oceanographic Institution";
    String people_1_affiliation_acronym "WHOI BCO-DMO";
    String people_1_person_name "Mathew Biddle";
    String people_1_person_nid "708682";
    String people_1_role "BCO-DMO Data Manager";
    String people_1_role_type "related";
    String project "Octocorals and Hurricanes";
    String projects_0_acronym "Octocorals and Hurricanes";
    String projects_0_description 
"NSF Award Abstract:
Disturbance and subsequent recovery have been key factors in the dynamics of coral reef populations, but in the Caribbean, there has been a steady decline in the abundance of hard corals accompanied by increased abundance of algae. This characterization overlooks the observation that at some sites for which there are quantitative data, the abundances of octocorals (sea fans and sea plumes) have increased. Closer inspection of those data reveals that octocorals have also declined at times, but unlike hard corals, they recovered and are now more abundant in at least some locations than 30 years ago. The change in abundances of these organisms would appear to due to the greater resilience of octocorals. The damage inflicted by Hurricanes Irma and Maria on the south shore of St. John, U.S. Virgin Is. provides a window into these processes. Abundances of hard corals on these reefs have been monitored for the past 30 years and the octocorals have been followed for the past 4 years. Colonization of the newly opened space on the reef will be studied to determine if further shifts in abundances can be expected and to understand the basis for the greater resilience of octocoral populations. Characterizing the resilience of octocorals relative to hard corals will have implications for the fate of Caribbean reefs in a world subject of increasing levels of stress. This will be of importance to policy makers and managers, because hard corals and octocorals provide substantially different ecosystem services. In addition to its impact on our fundamental understanding of reef processes, the grant will support the training of graduate students.
Coral reefs have been recognized to be disturbance driven systems for over 50 years and disturbance has been considered to be important in maintaining diversity of reef communities. However, the past 30 years has been characterized by declines in the abundances of scleractinians, often associated with acute events such as hurricanes and bleaching events. A knowledge of the effects of disturbance and subsequent recovery that occurs during these events is critical to understanding the changes in reef structure that have occurred in the last 30 years. At sites for which there are data, changes in the relative abundance of scleractinians and octocorals appear to coincide with disturbance followed by octocoral recovery and a lack of scleractinian recovery. This change must reflect changes in larval supply, settlement, and/or survival, and those differences should be greatest following disturbance. The effects of Hurricanes Irma and Maria on the south shore of St. John provide the opportunity to characterize recruitment following disturbance and identify the processes that may limit successful recruitment on contemporary reefs. Data are already available on the abundance of octocoral and scleractinian species over the past 4 years, and annual censuses have provided data on octocoral recruitment and survival and species level characterizations of octocoral abundances. Recruitment and survival are also being related to spatial complexity of the habitat at the scale of mm and cm and the effects on hurricane driven changes in that spatial complexity will also be assessed. The frequency and intensity of disturbances will at the least continue at historical or greater levels. The comparison of data from before and now after disturbance will provide a powerful assessment of the resilience of octocorals and scleractinians and the role of recruitment and recruit survival in their relative resilience. Thus the effects of Hurricanes Irma and Maria provide a window on the nature of future reefs.
Note: This project is closely associated with the project \"Ecology and functional biology of octocoral communities\". See: https://www.bco-dmo.org/project/562086.";
    String projects_0_end_date "2019-10";
    String projects_0_geolocation "St John, US Virgin Islands";
    String projects_0_name "RAPID: Resilience of Caribbean octocorals following Hurricanes Irma and Maria";
    String projects_0_project_nid "749653";
    String projects_0_start_date "2017-11";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 18.30293333;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String subsetVariables "Census_Year";
    String summary "This dataset contains octocoral colony heights measured during transect surveys at four sites on the south shore of St. John, US Virgin Islands in November 2017 following Hurricanes Irma and Maria.";
    String title "Octocoral species abundance during transect surveys at four sites on the south shore of St. John, US Virgin Islands from November to December 2017";
    String version "1";
    Float64 Westernmost_Easting -64.72993333;
    String xml_source "osprey2erddap.update_xml() v1.3";
  }
}

 

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