Ulf M. Berthelsen Thomas Bregnballe, AU BIOS

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1 Experiences, possibilities and future plans Ulf M. Berthelsen Thomas Bregnballe, AU BIOS

2 Own Little Tern involvement, short introduction

3 Own Little Tern involvement, short introduction Grand total : 933 pull. / ad. breeding birds (incl. 596 controls ~ 31,3 %) 2016 best season to date: 84 pull. / 138 ad. breeding birds (incl. 66 controls ~ 47,8 %)

4 Ringing of Little Tern (Sternula albifrons) in DK Wadden Sea Number of birds ringed and controlled breeding pull. ad. breeding birds ( 3cy+ ) New Controls Total Recent years ( ) Mainland coast (incl. Esbjerg) Fanø Rømø Langli (K.T. Pedersen)

5 Catching methods: Artificial eggs

6 Catching methods: Box trap ( Prielfalle / Kielerfælde )

7 Catching methods: Box trap ( Prielfalle / Kielerfælde )

8 Catching methods: Spring trap

9 High chick mortality

10 Natal (green) / breeding (red) dispersal, foreign influx 2

11 Natal (green) / breeding (red) dispersal, foreign influx 305 km 490 km km 543 km

12 Natal dispersal in DK Wadden Sea Natal dispersal Breeding dispersal

13 Natal / breeding dispersal to DK outside Wadden Sea area Natal dispersal Breeding dispersal 7 ad. / 1 pull.

14 Influx of DK birds ringed outside Wadden Sea area Natal dispersal Breeding dispersal 2016 NOT included 3

15 Influx of DK birds ringed outside Wadden Sea area Natal dispersal Breeding dispersal 2016 included 3 4

16 Ringing activities on Fanø 2015 and 2016 Breeding pairs ad. caught ad. controls Breeding pairs ad. caught ad. controls Fanø north c Fanø south Total c Ad. breeding bird (3 cy +) controls from (Ringed as chicks / adults) All 5 recaptured Distance Fanø internally Fanø N 3 (2009), 1 (2010) Fanø N 1 (2012), 9 (2015) Fanø S 6 (2015) Influx from outside Bøvling Klit 1 (2010) Thyborøn 1 (2012), 2 (2015) Gjeller Odde 1 (2015) Bøvling Klit 1 (2010) Bækbygård Strand 1 (2010) Hvide Sande 1 (2013) 134 S 124 S 100 S 85 S 63 S

17 Oil pollution Rømø mid 1990 s

18 AARHUS UNIVERSITY Ringing - Experiences When carried out with experienced gentleness ringing does NOT influence negatively on predation rate breeding success Challenges: Weather (sand drift), flooding, predation breeding failure renesting and movement of colonies influx of many un-ringed birds from outside the project area Estimating numbers of breeding pairs as observed birds x 0.7 will often lead to underestimates Beach breeding birds 24 Nov. 2016

19 AARHUS UNIVERSITY Ringing a tool in monitoring Closer monitoring breeding success factors affecting egg and chick survival Connectivity between breeding areas Effects of management actions Adult survival Recruitment and age of breeders Health status of breeders (i.a. oil pollution) Beach breeding birds 24 Nov. 2016

20 AARHUS UNIVERSITY Ringing studies the future Provided that we find funding and obtain permissions Follow effects of management actions Introduce colour-ringing Beach breeding birds 24 Nov. 2016

21 Colour ringing projects: Israel (ILT) and Great Britain & Ireland (GBT)

22 and a final wish: Ringing of chicks (at least) should be resumed on Rømø and in the German Wadden Sea in order to better understand connectivity between local breeding areas within the Danish Wadden Sea and exchange of birds with the German population reduce the influx of un-ringed birds and thus raise the outcome of ringing efforts

23 Thank you

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