Study ID 91

Baltic seabirds transect surveys

Download dataset

Realm: Marine
Climate: Temperate
Biome: Temperate shelf and seas ecoregions
Central latitude: 57.038966
Central longitude: 20.555517
Duration: 8 years, from 1992 to 1999

6318 records

68 distinct species

Across the time series Larus argentatus is the most frequently occurring species

Citation(s):

"Baltic Seabirds Transect Surveys", Institute of Ecology of Vilnius University - OBIS-SEAMAP. Available at: http://www.emodnet-biology.eu/component/imis/?module=dataset&dasid=1971, accessed 2012.

Methods

Standard seabird offshore sampling techniques (Tasker et al.. 1984; Webb. Durinck. 1992) assume that line transect of 300 m width is basically used for counting birds sitting on the water surface. whereas snap-shot method is used for 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 1000 m wide transect over the classic 300 m transect used for calculations of seabird densities during snap-shots. Unit of abundance = IndCountInt, Unit of biomass = NA