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Christopher Newport University bottlenose dolphin sightings in Virginia estuaries 2000-2006
Citatie
Foss, K.M. and J.R. Reed. 2006. Utilization of urbanized estuaries by northern migratory coastal stock of bottlenose dolphins, Tursiops truncatus in Virginia, USA. Poster Presentation. https://marineinfo.org/id/dataset/4951

Toegang tot data
Gearchiveerde data

Beschrijving
The Elizabeth River is bounded almost totally by industrial, urban, suburban, commercial shipping and military facilities. Tidal in nature, the river has low flow, resulting in heavy contamination loads. The population studied is the Northern Migratory Stock of the US Atlantic coast, appearing in this area from May through November. Standard small boat, focal group follow, passive observation techniques were used, along with photography of individuals. Data on location, group size estimates, activities observed and relevant environmental observations were recorded every five minutes. meer

The dolphins appear as individuals or pairs in April and May, with group size increasing in June to a peak mean of 29 animals sighted per encounter. Group size then decreases in October and November. Probability of encountering dolphins ranges from 0% during the winter and early spring to over 80% in July, tapering off towards fall. Activity patterns show greatest diversity in July and August, with travel constituting the main activity early and late. Despite a peak of births in the area in May-June, there is little mating until July, with the incidence of sexual activity peaking in September.
Purpose: To better understand the seasonality and behavior of bottlenose dolphins in the lower Chesapeake Bay.

Data were originally collected by Mr. Kevin Foss at Christopher Newport University during field seasons from 2000-2006. Data were subsequently acquired by the U.S. Navy in 2013.
[2015-03-24] A few records had a wrong animal count of zero. The value is replaced with a blank representing species presence only. These data are the result of small boat transects with focal group follows, so that sightings were recorded at regular intervals. Therefore, there may be sightings of the same individuals at different times.
Records that originally estimated a range for the number of adults were attributed with the median number to be conservative.
Three records on land were excluded.

Scope
Thema's:
Biologie > Zoogdieren
Kernwoorden:
Marien/Kust, ANW, USA, Virginia, Tursiops truncatus (Montagu, 1821)

Geografische spreiding
ANW, USA, Virginia [Marine Regions]

Spreiding in de tijd
10 Juli 2000 - 25 Juli 2006

Taxonomic coverage
Tursiops truncatus (Montagu, 1821) [WoRMS]

Parameter
Voorkomen van soorten

Bijdrage door
Christopher Newport University, meerdata creator

Gerelateerde datasets
Gepubliceerd in:
OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, meer

Dataset status: Afgelopen
Data type: Data
Data oorsprong: Onderzoek: veldonderzoek
Metadatarecord aangemaakt: 2015-04-22
Informatie laatst gewijzigd: 2015-04-23
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