Merikotkas sunnib kormorani kolima

Merikotkas sunnib kormorani kolima

EN

The White-tailed Sea Eagle Forces the Cormorant to Move

Merikotka ja kormorani toitumisalad Läänemerel kattuvad. Mõlemad püüavad kalu, kuid merikotkas jahib ka veelinde, sh kormorane.

, kes , sh kormorane. Uuring näitab, et mõlema liigi . See tähendab, et nad . Kuid , sest ta ründab ka kormorane.
Kormoranid püüavad kalda lähedal kalu. Merikotkas aga jahib nii kalu kui ka teisi linde. See . Näiteks Norra rannikul elavad suulad ja kaljukajakad on kolinud kohtadesse, kus merikotkad neid vähem häirivad.
Läänemerest. Tänu looduskaitsele on nende arvukus taas kasvanud. 2012. aastal oli Läänemere ümbruses juba 3000 paari merikotkaid. Nende arvu kasv on looduskaitse edu.
Merikotkad . Näiteks Rootsis ründavad merikotkad umbes pooli kormoranikolooniatest. Kormoranid sunnitakse kolima või isegi oma kolooniaid hülgama. Kuid mõnes kohas saavad merikotkad ja kormoranid rahus koos elada.
Merikotkad ründavad kormorani poegi ja pesi, eriti maapinnal olevaid. Puudel olevaid pesi rüüstatakse harvemini. Teada on ka juhtumeid, kus merikotkad käivad kolooniates puhkamas, ilma kormorane häirimata.
Uuring näitab, et muutub kormoran neile olulisemaks toiduks. Kui merikotkaid on palju, võib see . Merikotkad mõjutavad ka teiste lindude, nagu kajakate ja vareste, elu.

The feeding areas of the white-tailed sea eagle and the cormorant overlap in the Baltic Sea. Both hunt fish, but the white-tailed sea eagle also preys on waterbirds, including cormorants.

The white-tailed sea eagle is a large bird that hunts several species of fish and birds, including cormorants. The study shows that the feeding areas of both species overlap in the Baltic Sea. This means they compete for the same fish. However, the white-tailed sea eagle is dangerous to the cormorant because it also preys on cormorants.
Cormorants catch fish near the shore. The white-tailed sea eagle, however, hunts both fish and other birds. This forces cormorants to seek new nesting sites. For example, the guillemots and kittiwakes living on the Norwegian coast have moved to places where white-tailed sea eagles disturb them less.
At the beginning of the 20th century, the white-tailed sea eagle was almost extinct in the Baltic Sea. Thanks to conservation efforts, their population has grown again. By 2012, there were already 3,000 pairs of white-tailed sea eagles around the Baltic Sea. The growth of their population is a conservation success.
White-tailed sea eagles raid cormorant colonies. For example, in Sweden, white-tailed sea eagles attack about half of the cormorant colonies. Cormorants are forced to move or even abandon their colonies. However, in some places, white-tailed sea eagles and cormorants can live together peacefully.
White-tailed sea eagles attack cormorant chicks and nests, especially those on the ground. Nests located in trees are raided less frequently. There are also known cases where white-tailed sea eagles visit colonies to rest without disturbing the cormorants.
The study shows that as the number of white-tailed sea eagles increases, the cormorant becomes a more important food source for them. If there are many white-tailed sea eagles, it may limit the nesting opportunities for cormorants. White-tailed sea eagles also affect the lives of other birds, such as gulls and crows.