Baltic Seabirds Transect Surveys
Institute of Ecology of Vilnius University

Dataset credit

Gediminas Vaitkus, Institute of Ecology of Vilnius University

Contacts

RoleNameOrganization 
Primary contact Ramunas Zydelis Duke University
Data entry Ei Fujioka Duke University

Citation

Abstract

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
during 'snap-shots'.

Purpose

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.

Supplemental information

[2015-03-24] There were 199 records with a value of "EMPTY" or "empty" in the species column. These records are removed.

References

Attributes

Overview

Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downlodable online. Other attributes may be obtained upon provider's permission unless otherwise noted below.

Attributes in dataset provided

Attribute (table column)Description
transectTransect code
dateDate of observation
timeTime of observation
typeTransect type (1, 2, 3)
vesselShip name
o1Observer name first letters (left)
o2Observer name first letters (right)
statusdefinition not provided
latLatitude of observation
lonLongitude of observation
knotsShip speed (knots)
courseShip course (degrees)
speciesSpecies observed
tsnTaxonomic Serial Number by ITIS
scientificScientific name
commonCommon name
rankTaxonomic rank
numberNumber of animals observed
distanceBand of the transect (1, 2, 3 – inside, 4 - outside)
pattern1 – fly, 2 – sit on the water, 3 – follow the ship
ageAge category of the bird (code)
plumagePlumage (0, 1, 2, 3)
directionFlight direction – degrees estimated as if the ship is heading to the North (360 degrees)
fd_realReal flight direction (corrected according to ship
moultMoulting status (0, 1, 2)
remarksRemarks
geomGeometry field added by OBIS-SEAMAP
oidUnique ID number (generated by OBIS-SEAMAP)
OBIS-SEAMAP ID358
Seabirds11,593
Marine mammals0
Sea turtles0
Rays and sharks0
Other species11,696
Non spatial0
Non species340
Total23,629
Date, Begin1992-10-18
Date, End1999-03-08
Temporal prec.111111
Latitude54.83 - 58.88
Longitude17.69 - 24.36
Coord. prec.5 decimal digits
PlatformBoat
Data typeAnimal sighting
EffortYES (ID: 359)
Traveled (km)3,476
Effort hours219
Registered2006-07-11
Updated2006-07-14
StatusPublished
Sharing policy CC-BY-NC (Minimum)
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