{"id":5563,"date":"2021-03-03T19:13:27","date_gmt":"2021-03-03T18:13:27","guid":{"rendered":"https:\/\/seapop.no\/?page_id=5563"},"modified":"2021-03-03T19:13:29","modified_gmt":"2021-03-03T18:13:29","slug":"seabirds-at-sea","status":"publish","type":"page","link":"https:\/\/seapop.no\/en\/distribution-status\/distribution\/seabirds-at-sea\/","title":{"rendered":"Seabirds at sea"},"content":{"rendered":"\n

Species that are included in the analyses:<\/h4>\n\n\n\n
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English<\/strong><\/td>Latin<\/strong><\/em><\/td>Download map<\/strong><\/td><\/tr>
Little auk<\/a><\/td>Alle alle<\/em><\/td>PDF (2.9 MB)<\/a><\/td><\/tr>
Atlantic puffin<\/a><\/td>Fratercula arctica<\/em><\/td>PDF (3,0 MB)<\/a><\/td><\/tr>
Razorbill<\/a><\/td>Alca torda<\/em><\/td>PDF (3.0 MB)<\/a><\/td><\/tr>
Br\u00fc<\/a>nnich’s guillemot<\/a><\/td>Uria lomvia<\/em><\/td>PDF (2.5 MB)<\/a><\/td><\/tr>
Common guillemot<\/a><\/td>Uria aalge<\/em><\/td>PDF (3.0 MB)<\/a><\/td><\/tr>
Northern fulmar<\/a><\/td>Fulmarus glacialis<\/em><\/td>PDF (3.0 MB)<\/a><\/td><\/tr>
Black-legged kittiwake<\/a><\/td>Rissa tridactyla<\/em><\/td>PDF (3.0 MB)<\/a><\/td><\/tr>
Common gull<\/a><\/td>Larus canus<\/em><\/td>PDF (2.3 MB)<\/a><\/td><\/tr>
Herring gull<\/a><\/td>Larus argentatus<\/em><\/td>PDF (2.9 MB)<\/a><\/td><\/tr>
Black-backed gull<\/a><\/td>Larus marinus<\/em><\/td>PDF (3.0 MB)<\/a><\/td><\/tr>
Glaucous gull<\/a><\/td>Larus hyperboreus<\/em><\/td>PDF (2.6 MB)<\/a><\/td><\/tr>
Northern gannet<\/a><\/td>Morus bassanus<\/em><\/td>PDF (2.9 MB)<\/a><\/td><\/tr><\/tbody><\/table>
By clicking an English species name in the table, you will open the data portal, in which a distribution map for the chosen species<\/em> at sea in summer will be presented when you click “\u00c5pent hav data<\/strong>“.<\/figcaption><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n
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\"Utbredelseskart
Example: The three upper maps show the distribution and density for a given species (here, little auk) on the open sea in the summer (spring, summer), autumn and winter. The three lower maps show uncertainty estimates for the distribution maps as 95% confidence intervals. (C) SEAPOP<\/figcaption><\/figure>\n\n\n\n

<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Certain species are excluded from seasons and sea areas where they were too few in number for the analyses to be conducted.<\/p>\n\n\n\n

You can also retrieve maps on the distribution of seabirds on the open sea in the data portal<\/a>:
\u2022 Under \u201cTidsperiode\u201d, choose season (Sommer = summer, Vinter = winter or Myting\/H\u00f8st = moult\/autumn).
\u2022 Under \u201cGeografisk utvalg\u201d, choose sea area.
\u2022 Then choose the desired species under \u201cArtsvalg\u201d.
\u2022 Then click \u201c\u00c5pent hav data\u201d at the bottom.<\/p>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

About the maps<\/h3>\n\n\n\n

There are three maps for each species \u2013 one for each of the seasons. The maps are made up of 10×10 km2<\/sup> grids, and show predicted abundance for the species in question based on two-step analyses (see Data analysis<\/a>) of available distribution data of seabirds in Norwegian and adjacent sea areas. We also present, together with the maps, the uncertainty of the predictions as 95% confidence interval and standard error. It was not possible to define the confidence intervals for very low densities. It is therefore important to note that the uncertainty does not account for systematic errors resulting from differences in detection (see Methods<\/a>). Conspicuous species that easily follow vessels are systematically overestimated. This is particularly the case for such species as the northern fulmar, black-legged kittiwake, European herring gull, great black-backed gull and common gull. Small, dark species that dive are probably similarly underestimated. This is particularly the case for the auks: the little auk, Atlantic puffin, razorbill, Br\u00fcnnich\u2019s guillemot and common guillemot. Therefore, the abundance estimates must be treated as indices.<\/p>\n\n\n\n

Each sea area (the North Sea, Norwegian Sea and Barents Sea) is separately analysed. This results in some discontinuity in the border areas between sea areas.<\/p>\n\n\n\n

The seasons analysed are: <\/p>\n\n\n\n