InWaterLogger

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Michael Arendt, SCDNR Marine Resources Division
Publication_Date: 20130101
Title:
InWaterLogger
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
Marine Spatial Data: The data are summarized based on all turtles collected by trawl within a 1x1 minute grid of latitude and longitude during the summers of 2008-2012. General In-Water Turtle: The Marine Resources Division of the SC Department of Natural Resources manages a regional trawl survey to assess the relative abundance, distribution, health and demographics of sea turtles. This research endeavor has been funded by the National Marine Fisheries Service via four awards since FY99: NA97FL0374, NA07FL0499, NA03NMF4720281 and NA08NMF4720502. This research is carried out through numerous regional partnerships, notably the University of Georgia Marine Extension Service which conducts trawling aboard their R/V Georgia Bulldog south of the SC/GA border; off SC, trawling is conducted by SCDNR's R/V Lady Lisa. Data have been collected in five phases since inception: a regional trawl survey between St. Augustine, FL and Winyah Bay, SC (2000-2003; 2008-2009; 2011-2012); a design evaluation study (2010); fishery-dependent data collection (2000-2003); and sampling in shipping channels and subsequent telemetry studies (2004-2007). Overall results from the regional trawl survey indicate that most of the sea turtles collected are loggerheads (Caretta caretta), with Kemp's ridley (Lepidocheyls kempi) and Green (Chelonia mydas) sea turtles being the second and third most captured species, respectively. Eighty-five percent of loggerheads measured less than or equal to 75.1 cm minimum straight-line carapace length (SCLmin) suggesting that they are immature juveniles. The loggerheads collected have occurred with a 2:1 female to male sex ratio (determined by testosterone radioimmunoassay) of which 90% possess one of two regionally dominant genetic haplotypes. A suite of parameters analyzed for blood and other tissues suggest that loggerheads collected in our study are generally healthy, despite approximately one-quarter to one-third exhibiting signs of physical injury. Catch rates in the last decade were stable to increasing and were several times greater than catch rates during the 1970's and 1980's; however, sea turtle catch is infrequent in large part due to a random sampling design for a species with a clustered distribution.
Purpose:
Marine Spatial Data: This GIS data set was created for the purpose of describing the distribution and relative abundance of loggerhead sea turtles in southeastern coastal waters (Winyah Bay, SC to St. Augustine, Fl) so that this threatened species can be considered with respect to coastal use activities. General In-Water Overview: All sea turtle species are globally listed as threatened or endangered species. The loggerhead sea turtle was listed as a "threatened" species in 1978 and since 2008 a great debate has ensued regarding whether or not to re-list this species as "endangered" in the NW Atlantic Basin (where the second largest rookery in the world occurs). The in-water surveys collect a wide range of turtle sizes/ages, but primarily juveniles as noted above.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.479489
East_Bounding_Coordinate: -79.030385
North_Bounding_Coordinate: 33.247339
South_Bounding_Coordinate: 29.903240
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Trawl
Theme_Keyword: Loggerhead Turtle
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Florida
Place_Keyword: North Carolina
Place_Keyword: Southeast
Place_Keyword: South Carolina
Place_Keyword: Georgia
Access_Constraints: None
Use_Constraints:
Neither the State of South Carolina, the Department of Natural Resources, nor any of its employees, is responsible for any improper or incorrect use of the information described and/or contained herein, and assume no responsibility for the use of the information. The South Carolina Department of Natural Resources should be acknowledged as the data source in products derived from these data. In-Water Turtle: Data collected by the various phases of this research have been published in a series of annual and final reports to the National Marine Fisheries Service accessible from the "Sea Turtle Publications, Reports to NOAA" page on the NMFS Southeast Fisheries Science Center website: http://www.sefsc.noaa.gov/seaturtlecontractreports.jsp Annual and final reports are listed under the following first authors: Arendt (2007-, Annual reports; 2004-2008, Final) Segars (2006 Annual) and Maier (2005 Annual, 2000-2003 Final). Per the language specified by the NMFS SEFSC, the data are ".proprietary unpublished data. If you would like to use these data, you must contact the appropriate investigator(s) for permission." Numerous aspects of the data have also been published (26 manuscripts since 2000) in the peer-reviewed literature by multiple program collaborators, including six manuscripts pertaining to catch rates, spatial distributions, and demographic parameters published in 2012.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: SCDNR Marine Resources Division
Contact_Person: Michael Arendt
Contact_Position: Principal Investigator
Contact_Address:
Address_Type: physical
Address:
217 Fort Johnson Road
City: Charleston
State_or_Province: South Carolina
Postal_Code: 29412
Contact_Voice_Telephone: 843-953-9097
Contact_Electronic_Mail_Address: arendtm@dnr.sc.gov
Native_Data_Set_Environment:
Version 6.2 (Build 9200) ; Esri ArcGIS 10.1.0.3035
Back to Top
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Ninety-six percent (2,364 out of 2,460) of sampling events were not confined to a single grid cell (block) given the towing speed and trawl duration associated with sampling. Furthermore, at an estimated fishing width of 12 m per net and a target towing speed of 2.8 kts, a typical sampling event (two nets) covered 0.041 km2 in 2008-2010 and 0.062 km2 in 2011-2012. Accordingly, trawling events during these timeframes were estimated to sample 1.4% and 2.0%, respectively, of the surface area contained within each 1' x 1' (2.97 km2) SEAMAP block. Only two SEAMAP blocks were associated with the starting location for 8 replicate trawling events (i.e., maximum block area coverage ~16%), and 87% (1,043 out of 1,196) of SEAMAP blocks contained three or fewer replicate trawl start collections.
Lineage:
Process_Step:
Process_Description:
GIS processing: 1.) One point layer of the in-water turtle summary data was created where each point was the mid-point of a 1 x 1 minute grid cell where there was in-water turtle sampling between 2008 and 2012. A 1 x 1 min. grid of the whole offshore study area was created. 3.) A spatial selection was performed to select those 1 x 1 min. grid cells that contained In-Water turtle summary data assigned to the grid cell mid-points. A new layer was created with just the selected grid cells. 4.) The mid-points from the in-water turtle data layer were spatially joined to the 1 x 1 min. grid layer to create a final gridded layer with one value/grid (e.g. MeanCPUE). For the join, the point layer was joined to the grid polygon layer. 5.) Deleted unnecessary attribute columns. 6.) Exported the joined layer to the final geodatabase.
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: SCDNR, MRRI
Contact_Person: Jessica Boynton
Contact_Position: GIS Manager I
Contact_Address:
Address_Type: physical
Address:
217 Fort Johnson Rd.
City: Charleston
State_or_Province: SC
Postal_Code: 29412
Country: US
Contact_Voice_Telephone: 843-953-9163
Contact_Facsimile_Telephone: 843-953-9820
Contact_Electronic_Mail_Address: boyntonj@dnr.sc.gov
Process_Step:
Process_Description:
Trawling was conducted using NMFS Turtle nets: paired 18.3 m (head rope), 4-seam, 4-legged, 2-bridle nets. Net body consisted of 10.2 cm bar and 20.3 cm stretch mesh, with top's and sides made of #36 twisted nylon and bottom consisting of #84 braided nylon twine. Trawl bottom time was 20 min in 2008-2010 at a target vessel towing speed of 2.8 kts, but the original (2000-2003) 30 min tow time was restored (Permit #15566) beginning in 2011. At the beginning of each annual sampling season, stations were randomly selected from a sampling universe representing the center of 3.4 km2 grids of trawl-able bottom in water depths 4.5 to 17.5 m deep. Six research cruises were completed each year with weekly alternation north and south of two vessel homeports (Charleston, SC and Brunswick, GA). Aboard each vessel, daily station sampling order was selected to enable net latitudinal progress while alternating between stations located closer and further from shore in order to diversify longitudinal sampling with respect to time of day and tide stage. In 2008-2009 and again in 2011-2012, trawling was conducted throughout the survey area between Winyah Bay, SC and St. Augustine, FL. (Note: 69 trawling events targeting "hot spots" during 12-15 August 2008 were excluded due to the non-random nature of that sampling). In 2010, trawling was conducted at selected SEAMAP strata pairs within this regional survey area in order to conduct repeat sampling at randomly selected stations to evaluate a modified sampling design. Two thousand four hundred sixty trawl events were retained after excluding for years prior to 2008 and the August 2008 "hot spot" sampling. The start latitude and longitude of each trawl was used to assign it to a 1' x 1' SEAMAP grid cell (block), which resulted in the assignment of these data to 1,196 SEAMAP grid cells. Data from all sampling locations within a grid cell were then averaged (e.g. Mean CPUE and CV) and the resulting data values were reassigned to the mid-point of the grid cell with respect to latitude and longitude as described in the attributes section. Eight hundred fourteen sea turtles were collected during 609 (25%) sampling events, of which 700 were loggerheads (86%), 110 were Kemp's ridleys (14%) and four were Green sea turtles. No loggerheads were collected in 779 (65%) SEAMAP blocks. Only one loggerhead was collected in 257 (22%) of SEAMAP blocks and only two loggerheads were collected in 105 (9%) SEAMAP blocks. Three or more (maximum = 14) loggerheads were only collected in 55 (4%) SEAMAP blocks. No Kemp's ridley sea turtles were collected in 1,119 (93%) SEAMAP blocks. Only one Kemp's ridley was collected in 62 (5%) SEAMAP blocks, with two or more (maximum = 5) Kemp's ridleys collected in just 19 SEAMAP blocks.
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: SCDNR Marine Resources Division
Contact_Person: Mike Arendt
Contact_Position: Principal Investigator
Contact_Address:
Address_Type: physical
Address:
217 Fort Johnson
City: Charleston
State_or_Province: SC
Postal_Code: 29412
Contact_Voice_Telephone: 843-953-9097
Contact_Electronic_Mail_Address: arendtm@dnr.sc.gov
Process_Step:
Process_Description:
Dataset moved.
Source_Used_Citation_Abbreviation:
\\Mrdnas\GIS\Boynton\GISProjects\2011\Other\Research\SCWindProject\Metadata\MetadataTemplate
Process_Date: 20110615
Process_Time: 102721
Back to Top
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1194
Back to Top
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Transverse Mercator
Transverse_Mercator:
Transverse Mercator
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -81.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units:
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Back to Top
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: InWaterLogger
Attribute:
Attribute_Label: OBJECTID_1
Attribute_Definition:
Internal feature number.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: N_Coll
Attribute_Definition:
Total number of trawl event start locations in the SEAMAP block during 2008-2012.
Attribute:
Attribute_Label: Freq_Occ
Attribute_Definition:
The frequency of occurrence (0.0 to 1.0) of positive sea turtle catch events in the SEAMAP block; this value was used to group SEAMAP grids by sea turtle catch quartiles.
Attribute:
Attribute_Label: MeanCPUE
Attribute_Definition:
The mean catch per unit effort (CPUE) per SEAMAP block, calculated as the mean loggerhead count per trawl collection.
Attribute:
Attribute_Label: CV_CPUE
Attribute_Definition:
The Co-efficient of Variation (CV) for mean SEAMAP block CPUE, calculated as the standard deviation of loggerhead counts per trawl event divided by mean CPUE in column C.  For SEAMAP blocks where CPUE = 0.0, standard deviation could not be calculated; however, CV was subsequently set to 0.0. 
Attribute:
Attribute_Label: Mid_Lat
Attribute_Definition:
Mid latitude point for the SEAMAP block; calculated as 0.5 added to the latitude minutes integer then divided by 60 to express latitude in decimal degrees.
Attribute:
Attribute_Label: Mid_Long
Attribute_Definition:
Mid longitude point for the SEAMAP block; calculated as 0.5 added to the longitude minutes integer then divided by 60 to express longitude in decimal degrees.
Attribute:
Attribute_Label: BLOCK
Attribute_Definition:
SEAMAP block ID, assigned using trawl start latitude and longitude as described.
Attribute:
Attribute_Label: Shape_Length
Attribute_Definition:
Length of feature in internal units.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: Shape_Area
Attribute_Definition:
Area of feature in internal units squared.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Positive real numbers that are automatically generated.
Back to Top
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: South Carolina Department of Natural Resources
Contact_Position: Spatial Data Manager
Contact_Address:
Address_Type: mailing
Address:
Rembert C. Dennis Building P.O. Box 167
City: Columbia
State_or_Province: SC
Postal_Code: 29202
Country: US
Contact_Voice_Telephone: 803-734-9100
Contact_Facsimile_Telephone: 803-734-7001
Contact_Electronic_Mail_Address: gisman@dnr.sc.gov
Distribution_Liability:
See access and use constraints information.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: File Geodatabase Feature Class
Digital_Transfer_Option:
Back to Top
Metadata_Reference_Information:
Metadata_Date: 20130218
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: SCDNR, Marine Resources Division, MRRI
Contact_Person: Jessica Boynton
Contact_Position: GIS Manager I
Contact_Address:
Address_Type: mailing
Address:
P.O. Box 12559
City: Charleston
State_or_Province: SC
Postal_Code: 29422
Country: US
Contact_Voice_Telephone: 843-953-9163 (Boynton)
Contact_Facsimile_Telephone: 843-953-9820
Contact_Electronic_Mail_Address: boyntonj@dnr.sc.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Back to Top