DUML vessel-based line transect surveys for proposed Onslow Bay USWTR site 2007-2010

Duke University Marine Laboratory

The United States (US) Navy proposed constructing an Undersea Warfare Training Range (USWTR) along the US Atlantic coast. One of the proposed sites within the Cherry Point (CHPT) OPAREA is an area of 1,713 km2 in Onslow Bay, 87 km from the coast of North Carolina. We established a monitoring program designed to estimate density and document distribution and seasonal residency of marine mammals and sea turtles in the proposed USWTR. We established ten 40 nm long transect lines, spaced approximately 5 nm apart. These ten transect lines were surveyed by both shipboard (Duke University Marine Lab) and aerial platforms (conducted by University of North Carolina Wilmington). The survey area incorporates a variety of habitats from shallow waters of the shelf to the continental slope; the Gulf Stream meanders through the eastern portion of the survey area, flowing towards the northeast. The surveys began in June 2007 and have transitioned into ongoing photo-ID and biopsy sampling surveys.

The primary objectives of these surveys are to:

(1) document species occurrence, estimate densities, and examine patterns of residency of marine mammals and turtles in the defined study area,

(2) conduct seabird counts concurrent with the visual surveys, and

(3) supplement the visual surveys with acoustic monitoring using a towed hydrophone array.

The towed array will facilitate compilation of an acoustic library of species-specific recordings.


This is a collaborative project with University of North Carolina Wilmington and the Research Unit for Wildlife Population Assessment, Centre for Research into Ecological and Environmental Modelling, University of St. Andrews, Scotland.

Records that did not include time were filled with 00:00:00 and noted in the [Notes] field.
Effort data associated with the additional sightings are forthcoming.
Additional survey data for the Onslow Bay USWTR site are available on OBIS-SEAMAP in the DUML vessel-based photo-id and biopsy surveys in Onslow Bay CHPT OPAREA 2011-2013 dataset.

The dataset has been updated over time as outlined below. Each entry includes the version number, release date, type of change, and a short description.

Overview

Attributes described below represent those in the original dataset provided by the provider.
All attributes are included in the downloadable file (CSV or ESRI File Geodatabase) for "Complete Set of Dataset".

Attributes in dataset

Attribute (table column)	Description
oid	Unique ID number (generated by OBIS-SEAMAP)
obs_date	Date of observation
obs_time	Time of observation
effort	Effort (on or off)
latitude	Latitude of observation
longitude	Longitude of observation
depth	Observed depth (meters)
temp	Observed temperature (degrees Celsius)
sp_obs	Species observed
obs_count	Number of animals observed
sp_tsn	ITIS Taxonomic Serial Number added by OBIS-SEAMAP
notes
geom