Baltic Seabirds Transect Surveys
Gediminas Vaitkus, Institute of Ecology of Vilnius University
Zydelis, R. 2006. Baltic Seabirds Transect Surveys. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/358) on yyyy-mm-dd.
Halpin, P.N., A.J. Read, E. Fujioka, B.D. Best, B. Donnelly, L.J. Hazen, C. Kot, K. Urian, E. LaBrecque, A. Dimatteo, J. Cleary, C. Good, L.B. Crowder, and K.D. Hyrenbach. 2009. OBIS-SEAMAP: The world data center for marine mammal, sea bird, and sea turtle distributions. Oceanography. 22(2):104-115.
Seabirds transect surveys were conducted in Baltic Sea from 1992 to 1999. Standard seabird offshore sampling techniques assume that line transect of 300 m width is basically used for counting birds sitting on the water surface, whereas the 'snap-shot' method is used for the counting of flying birds at strongly fixed intervals of time.
Additional efforts were put into studies of the offshore seabird and waterfowl movements. We recorded flying
birds along 1,000 m wide transect over the 'classic' 300 m transect used for calculations of seabird densities
The main purpose of our work was to investigate spatial structure and dynamics of the offshore seabird populations and to assess their status in specific conditions of the Baltic Sea marine ecosystem. The main tasks of our work were the following:
-Study species composition, abundance and spatial distribution of seabird populations in different seasons of the year, distinguish dominating species and the most important seabird concentration areas in the eastern Baltic;
-Study community structure of inter-specific assemblages and ecological adaptations of wintering seabird populations;
-Study the processes of spatial dynamics and trends of spatial structure in regional seabird populations within the gradient of winter climatic conditions; and
-Study offshore migratory routes and temporary concentration areas of seabirds in the Baltic Proper.
[2015-03-24] There were 199 records with a value of "EMPTY" or "empty" in the species column. These records are removed.
Attributes described below represent those in the original dataset provided by the provider.
Attributes in dataset provided
|Rays and sharks||0|
|Latitude||54.83 - 58.88|
|Longitude||17.69 - 24.36|
|Coord. prec.||5 decimal digits|
|Data type||Animal sighting|
|Effort||YES (ID: 359)|
|Sharing policy||CC-BY-NC (Minimum)|
|Also availalbe from||iOBIS|
|See metadata in static HTML|
|See metadata in FGDC XML|
|See download history / statistics|