Method for monitoring population development

Nests and individuals in sampling plots When monitoring breeding seabird populations, the standard unit for most species is 'apparently occupied nest or nest site'. This is usually a nest containing…

Method for monitoring reproduction

Nest inspections In general, breeding success in a colony or population is calculated by registering a sample of nest contents in the colony at least twice during the breeding season.…

Method for monitoring survival rate

Annual adult survival rates of birds within a given population are estimated using mark-recapture analyses. Data for such analyses are collected by individually marking (colour ringing) a sample of birds…

Monitoring the time of breeding

See SEAPOP's data series for the seabirds’ phenology Search for data on phenology in our data portal Climate changes threaten time-sensitive processes Have these black-legged kittiwakes chosen the wrong time to start…

Causal research

The whole life cycle is studied Population counts are of course important, and they give good indications as to whether a population is increasing, declining, or stable, but they will…

Species

The maps and graphs for each species are generated in SEAPOP's data portal. Read about how to use the data portal! The descriptions of each species are provided by the Norwegian Biodiversity…

Species

The maps and graphs for each species are generated in SEAPOP's data portal. Read about how to use the data portal! The descriptions of each species are provided by the Norwegian Biodiversity…

Methods

The methodology must be quality-assured All science places strong demands on the methods one chooses to use. SEAPOP requires not only that the results are statistically robust and adequately replicable,…

Calculating population sizes

Fieldworkers from SEAPOP counting birds in a colony on Spitsbergen. Photo: Sébastien Descamps We apply several methods for bird counting, but in many cases, we simply count the individuals we…

Mapping methodology along the coast

See maps and data on seabird distribution Counts from boat and from land One aspect is the platform. A more important aspect is the methods that are used. They span from…

SEAPOP’s seabird monitoring methodology

The monitoring of seabirds at key sites involves many hours of observation and registration, all while one is as careful as possible to avoid disturbing the birds. Here, reproduction data…

Methodology for revealing seabird migration and habitat use

GPS and satellite transmitters have been very useful tools in this work. An Achilles’ heel for such technology is the battery. Its weight and size have placed many limitations on…

Mapping method for seabirds on the open sea

See maps and data on seabird distribution Observational methodology The strip transect method. All seabirds in the red sector are counted while the boat sails in a straight line at a constant…

The seabird studies at sea – prioritized species, and spatial and temporal boundaries

Geographical boundaries All Norwegian sea areas, as well as adjacent areas where data were available, and which resulted in complete pelagic ecosystems when combined, were included in the analyses. The…

Analysis of seabird data from the open sea

Statistical modelling The transect data only cover thin strips of the large sea areas where it is desirable to predict the distribution of the seabirds. As a result of the…

Population sizes

Four main questions SEAPOP focuses on four population numbers: How many seabirds breed in Norway?How many seabirds overwinter along the coast?How many sea ducks moult (change feathers) along the coast…

Monitoring

In SEAPOP, monitoring encompasses annual measurements of how populations of different seabird species are doing at any given time, reflected firstly through variables such as population size (how many are breeding), breeding success (how…

Monitoring survival rates

See SEAPOP's data series for adult seabird survival Search for trends in seabird survival rates in our data portal! Adult survival is important for the populations The black guillemot «Green CM» displays…

Monitoring the seabirds’ diet

See SEAPOP’s data series for diet in seabirds. Search for trends in seabird survival rates in our data portal! Large variations in food choice A Brünnich’s guillemot has caught a capelin that it…

Monitoring seabird breeding success

A black-legged kittiwake normally lays 2-3 eggs, but in most cases not all of the young will grow up. Photo: Hallvard Strøm A decline in the breeding population is therefore…

Monitoring population development in seabirds

Population monitoring is important, and can provide early signals to the management and research environments as to what is happening in marine ecosystems. The results can also be used to…

Population sizes of wintering seabirds

Monitored species The monitoring of winter populations is conducted as counts from set counting points on land by members of the local chapters of the Norwegian Ornithological Society (NOF). On…

Population numbers at sea

Are the seabird communities changing? SEAPOP has joined the ecosystem research cruises in the Barents Sea every year since 2004, and we use the data from these cruises to answer…

Population sizes of breeding seabirds

Monitored species and areas In the Seabird Project, black-legged kittiwakes and auks were the main focus. After the project finished, the population development time series for the colonies on Runde,…

Key sites

The sites reflect variation The aim is to reflect the ecological variation in the seabird communities in an adequately nuanced manner. Out of consideration for cost efficiency and logistics, a…