Caspian Terns in Sweden: Population Trends & Threats
Explore the population trends of Caspian Terns in Sweden from 1990 to 2015, including data on breeding pairs, threats to the species, breeding success, and comparisons between Swedish and Finnish colonies. Discover the changes in breeding success percentages, average numbers of pairs and pullis, and the difference in the number of pairs between the two countries.
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Presentation Transcript
Caspian Terns in Sweden Population trends 1990-2015 Project Caspian Tern Sweden, Ulrik L tberg
Reduction of breeding success of Caspian Tern in Sweden 1990-2012 1990-1999 2003-2012 Change in % 477 580 408 493 68 Average number of breeding pairs Average number of breeding pairs in colonies Average number of solitary breeding pairs 22 21 28 88 Average number ringed pullis Average number ringed pullis in colonies Average number ringed pullis in solitary breedings 484 444 41 398 362 37 -18 -19 -9 Average number of ringed pullis per breeding pair Average number of ringed pullis per breeding pair in colonies Average number of ringed pullis per solitary breeding pair 1,02 1,10 0,62 0,68 0,72 0,42 -34 -34 -32
Swedish colonies vs Finnish colonies Total number of pairs Sweden vs Finland => Finland has 50% more pairs than in Sweden 70 60 50 Average no of pairs in colonies in Finland 40 Average no of pairs in colonies in Sweden No of colonies in Finland 30 No of colonies in sweden 20 10 0 2010 2011 2012 2013
