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Saturday, August 20, 2011

Caspian Terns migration and metal ring readings "Lake Kummerow 2011"




Between 04th August till 15th September 2011 passed in total approximately 650-700 Caspian Terns the Lake Kummerow in Mecklenburg-Western Pomerania!


I studied 632 Caspi's in more detail :

  • 462 Ind. > 1.cy (73,1 %) and 170 Ind. 1.cy (26,9 %)
  • thereof 247 Ind. metal rings (39 %)
  • thereof 177 Ind. > 1.cy (71,7 %) and 70 Ind. 1.cy (28,3 %)
  • thereof 142 Ind. from Sweden (57,5 %) and 105 Ind. from Finland (42,5 %)
  • 138 readings of metal rings with 70 different birds incl. three Finnish and two Swedish colour-ringed Caspi's: 

  • ad. yellow "CCJ8" (27.08.-01.09.11) 
  • 1.cy yellow "CHL" (29.08.-09.09.11)
  • ad. yellow "CACO" (03.09.11)
  • 1.cy red "AC2" (09.09.11).
  • 1.cy red "AA9" (12.-14.09.11)

BTW: The young Finnish Caspian "CT-097.099" with a long interesting stay for three weeks on Lake Kummerow (25.08.-14.09.11) - 12.09.2011 - © C. Rohde

Sorry, I work with Macintosh - somtimes problems with the Layout by Windows....
My "Caspian Tern season" has started since early of August on Lake Kummerow. 
In the next days you can find information about the migration and metal ring readings of "Caspi's". 
The migration usually starts on Lake Kummerow with Swedish Caspi's. 
Image above see you a young finnish Caspian and image below an ad. bird, Lake Kummerow both on 01.09.2011 - © C. Rohde.
The beautiful Caspian Tern - Lake Kummerow 01.09.2011 - © C. Rohde
Note the metal ring on the right leg. This Caspian is from Finland with code "CT-091.924". I saw the same bird on 02.09.2010 on the same location! Lake Kummerow 16.08.2011 - © C. Rohde
My first red colour-ringed Swedish Caspian "AC2" on Lake Kummerow, 09.09.11 - © C. Rohde.
Red colour-ring "AC2" is clearly visible - 09.09.11 - © C. Rohde.
The young Caspian Terns are still provided to the passage of a parent. Lake Kummerow 01.09.2011 - © C. Rohde.
Here you can see my second colour-ringed Swedish "AA9". But the ring is in some positions difficult to classify. It can also be read as "6VV"! Lake Kummerow 12.09.2011 - © C. Rohde.
Lake Kummerow 01.09.2011 - © C. Rohde
Lake Kummerow 01.09.2011 - © C. Rohde
Parasites lurking....01.09.2011 - © C. Rohde
Minimum three Caspi's on the picture have a metal ring. In the center also the young Tern. Lake Kummerow 20.08.2011 - © C. Rohde.
Right the ad. Caspian from Finland with metal ring "CT-105.213", Lake Kummerow 01.09.2011 - © C. Rohde
Evening atmosphere with the Caspi's and mosquitoes.....Lake Kummerow 16.08.2011 - © C. Rohde
Two finnish yellow colour-ringed Caspi's on 30.08.2011 - Left "ad. "CCJ8" and right 1. cy. "CHL" -  © C. Rohde.
1.cy "CHL" Lake Kummerow on 01.09.2011 - © C. Rohde
"CCJ8" Lake Kummerow on 01.09.2011 - © C. Rohde
The autumn migration route of "CCJ8". 1017 km between birth place in Finland and the reading place near Demmin (Lake Kummerow) in NE-Germany.
Finnish Caspian "CACO" arrived on 03.09.11 Lake Kummerow (since 2008 between 29.08. and 02.09.) - © C. Rohde
"CACO" togehther with "CT-0???" (bottom) both from Finland (disturbed by one boat) 03.09.2011 - © C. Rohde
The best migration of Caspians is during a strong westerly wind. Typical - End of August, the Finnish Caspian Terns are in the majority.....
An example of a counting on 30.08.11 (Lake Kummerow): ∑ 52 Caspians - of them are 36 ad. birds (16 with metal ring) and 16 1.cy birds (8 with metal ring). 18 metals from Finland and only 6 from Sweden - © C. Rohde.