Great Cormorant

Phalacrocorax carbo

Skarv

Skarv

Short abstract from the book:
The great cormorant recolonised Denmark in 1938 after a long period of persecution. The species was protected by law in 1972, and today the breeding population consists of 39,000 pairs in 50–60 colonies. Ringing of the great cormorant began in 1940. Of a total of 36,203 ringed great cormorants, 4,606 have been recovered dead. Most birds were ringed as chicks in May–June. The Danish great cormorants leave the colonies in July– August, but 84 % are still found within 400 km until October. The autumn migration peaks in September– November, with adults leaving Denmark before young birds. Some birds migrate along the European west coast to the Netherlands and Belgium, where most Danish birds are found in September–October. Others migrate almost due S from Denmark to the Alpine lakes. During winter Danish great cormorants are found all over western and southern Europe and North Africa. Most are recovered around the Mediterranean. Six per cent are recovered in Denmark during winter. The mean position during winter was further north in 1990–2002 than previously. Most birds depart from the Mediterranean in February– March, with the spring migration following the same route as in autumn. The first birds to arrive in the colonies in January–February have often spent the winter in northern Europe. Most birds return in March–April. Some one-yearold birds have been recovered from southern Europe during summer. Birds from Norway, Sweden, Finland, the Baltic countries, Germany and the Netherlands have been found in Denmark in July–October. Many great cormorants have been recovered drowned in fishing nets (27 % of the total number of dead birds). Most (74 %) of these were young birds in their first year. Hunting is the second most common cause of death (18 % of the total number of dead birds).

Read more about the species in the chapter from The Danish Bird Migration Atlas here

Ringing data for Great Cormorant

 
Datavisning: genmeldinger    genmeldinger/mærkninger    mærkninger
Sæson: alle    vinter    forår    sommer    efterår
Periode: alle    før 2003    2003 og frem    seneste 365 dage


Data

Birds ringed
Birds ringed 98.522
Ringed as chicks 0 (0,0%)
Recoveries
No. of recoveries 13145
No. of individuals 0
Proportion recovered 0,0%