Norfolk/VA Beach Bottlenose Dolphin Photo-ID Surveys

HDR Environmental, Operations and Construction, Inc.

Dataset credit

The U.S. Navy Marine Species Monitoring Program

Contacts

RoleNameOrganization 
Primary contact Amy Engelhaupt HDR Inc.
Primary contact Dan Engelhaupt HDR, Inc.
Data entry Ei Fujioka Duke University

Citation

Abstract

A combination of visual line-transect survey, photo-
identification (photo-ID), and automated acoustic
monitoring methods was used to gather important baseline
information on the occurrence, distribution, and density
of marine mammals near Naval Station Norfolk (NSN) and
adjacent areas. The study area was designed to cover areas
where United States Navy activity is substantial,
including Chesapeake Bay waters near NSN and Joint
Expeditionary Base Little Creek-Fort Story, as well as a
Mine Exercise (MINEX) Area (W-50) in the Atlantic Ocean
off the coast of Virginia Beach, Virginia. Sixty-one line-
transect surveys were completed in two zones (INSHORE and
MINEX) between August 2012 and August 2015, with 6,550
kilometers (km) and 349.6 hours completed on-effort. The
majority of sightings were of bottlenose dolphins
(Tursiops truncatus), although humpback whales (Megaptera
novaeangliae), harbor porpoises (Phocoena phocoena), and
short-beaked common dolphins (Delphinus delphis) were also
sighted in the study area on occasion. In addition,
loggerhead sea turtles (Caretta caretta), leatherback sea
turtles (Dermochelys coriacea), and a Kemp’s ridley sea
turtle (Lepidochelys kempii) were sighted during surveys.
Conventional line-transect analysis of bottlenose dolphin
sightings showed both spatial and seasonal variation in
density and abundance, with greatest density in the
INSHORE zone during fall months. Densities in the INSHORE
zone were calculated as 3.88 individuals per square
kilometer (km2) (abundance[N]=1,203) in fall, 0.63
individuals per km2 (N=195) in winter, 1.00 individuals
per km2 (N=311) in spring, and 3.55 individuals per km2
(N=1,101) in summer. Densities in the MINEX zone were
calculated as 2.14 individuals per km2 (N=1,277) in fall,
0.06 individuals per km2 (N=37) in winter, 1.53
individuals per km2 (N=913) in spring, and 1.39
individuals per km2 (N=829) in summer. Twenty-seven photo-
ID surveys were completed, and a photo-ID catalog was
created using photos taken during both dedicated photo-ID
and line-transect surveys through May 2014; it contains
878 identified individuals to date. Subsequent photos will
continue to be added and analyzed. One hundred ten
individuals were re-sighted; however, most re-sightings
were less than 4 months and 30 km apart. Additional survey
effort and further analysis will be required before any
clear movement patterns can be determined. C-POD acoustic
data-loggers were initially deployed at four sites
throughout the study area to cover areas of high United
States Navy activity. Bottlenose dolphins were detected in
each deployment location during all deployments from
August 2012 to December 2015. Though deployments did not
provide consistent coverage in all seasons for all sites
due to loss of gear, results from two deployment sites
nearest to NSN showed a greater level of occurrence during
fall months, and a diel pattern of occurrence with
increased detections during nighttime hours for three
deployment sites.

Purpose

The HDR Marine Species Monitoring (MSM) Team was tasked to
initiate a monitoring project in coastal waters around
NSN, JEB-LC, JEB-FS, and the Virginia Beach waterfront,
including the VACAPES MINEX W-50 training area. The main
objective is to provide quantitative data and information
on the seasonal occurrence, distribution, and density of
marine mammals. Effort was dedicated to working with local
researchers and employing proven marine mammal monitoring
and research techniques to accomplish the following:

1. Conduct monthly systematic line-transect surveys to
determine distribution of marine mammals in the vicinity
of NSN, JEB-LC, JEB-FS, and the MINEX W-50 area.

2. Conduct monthly photo-identification (photo-ID) surveys
during summer months to determine the site fidelity and
distributional patterns of marine mammals utilizing the
areas listed above.

3. Supplement visual surveys by deploying and retrieving
four C-POD acoustic recording devices to monitor for
dolphin echolocation clicks in specific locations.

Supplemental information

[2019-08-27] New data were appended and some columns with
empty values were removed. The dataset name is changed by
dropping the time period part.

This dataset includes sightings from photo-id surveys. No
images and information on individual animals are provided.

This dataset includes a subset of the data collection for
the Norfolk-VABeach Vessel surveys.
Other data of the collection are available in the
following datasets:
target="_blank">Norfolk/VA Beach Inshore Vessel Surveys
Nov 2012- Nov 2013

target="_blank">Norfolk/VA Beach MINEX Vessel Surveys

All the US Navy-funded survey datasets are found in the href="http://seamap.env.duke.edu/partner/NAVY"
target="blank">OBIS-SEAMAP US Navy
page.

References

Attributes

Overview

This section explains attributes included in the original dataset. OBIS-SEAMAP restricts the attributes available to the public to date/time, lat/lon and species names/counts only. Should you need other attributes described here, you are encouraged to contact the data provider.

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
oidUnique ID number (generated by OBIS-SEAMAP)
behaviorInitial behavioral state of the animal or group when first observed. Examples: Travel, Mill, Rest
beaufortscaleBeaufort sea state (0-12)
countcalvesThe number of calves in the sighting
counttotmaxThe highest estimate of the number of animals in the sighting
counttotminThe lowest estimate of the number of animals in the sighting
cueThe sighting cue that initially drew the observers attention
depthsoundingDepth as determined in situ via sounding in meters
effortstatusThe effort status of the platform. Options: On-effort (systematic), on-effort (focal follow), on-effort (circling), on-effort (random), off-effort (connector lines), off-effort (transiting), off-effort (other)
headingplatmagneticHeading of the observation platform relative to magnetic North in degrees
headingplattrueHeading of the observation platform relative to true North in degrees
latplatformThe latitude of the platform in decimal degrees
longplatformThe Longitude of the platform in decimal degrees
observerThe name of the observer who first sighted the animal
observerrightName of the observer on the right (starboard) side of the platform
oceanThe ocean where the survey took place (Pacific, Atlantic, Indian, etc.)
photoframesThe photo frames used for the sighting; or total frames taken
photogapherName of the photographer
photosWere photos taken as part of the sighting? (Y/N)
picPilot in command
platformmodelModel of a/c or vessel (e.g. Partenavia Observer, RHIB, etc.)
platformtypeType of survey platform (e.g., "aerial", "vessel")
rangecomplexThe Range complex (or complexes) associated with the survey (JAX, SOCAL, Cherry Point, etc.)
sightingnotesNotes field to capture information not covered by existing attributes or other information of interest
sightingnumberThe sighting number for the particular survey day
spcsnmcomCommon name of the sighted species. Output should be singular (e.g. bottlenose dolphin)
sp_tsnTaxonomic Serial Number added by OBIS-SEAMAP
sightingtimeendThe time at which the sighting was discontinued
surveyidA survey identifier consisting of data collector, range complex, platform, year, month, and day. (Data Collector/Source)_(Range Complex)_(Platform Type or Details)_(Year)(Month)(Day) (eg. SES_SOCAL_Aerial_20120417)
geomGeometry field added by OBIS-SEAMAP
OBIS-SEAMAP ID1166
Seabirds0
Marine mammals188
Sea turtles16
Rays and sharks0
Other species0
Non spatial0
Non species0
Total204
Date, Begin2012-08-09
Date, End2015-08-29
Temporal prec.111111
Latitude36.69 - 37.00
Longitude-76.35 - -75.92
Coord. prec.6 decimal digits
PlatformBoat
Data typeAnimal sighting
EffortYES (ID: 1203)
Traveled (km)2,812
Effort hours188
Contr. throughNavy
Registered2014-06-10
Updated2019-08-29
StatusPublished
Sharing policy CC-BY (All)
Also available in GBIF (via DOI)
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics