Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk...
-
Upload
alfred-malone -
Category
Documents
-
view
215 -
download
0
Transcript of Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk...
![Page 1: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/1.jpg)
Hooge Platen Nature Reserve Bird island in a shipping channel
November 13th-17th, Minsmere, SuffolkRene Beijersbergen
![Page 2: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/2.jpg)
Westerscheld estuary
![Page 3: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/3.jpg)
Keeping an eye on the island
![Page 4: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/4.jpg)
Volunteers at work
![Page 5: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/5.jpg)
Little Tern breeding in the “safe haven”…
![Page 6: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/6.jpg)
Behind the “seawall”……..
![Page 7: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/7.jpg)
The beach, the seawall and the dunes
![Page 8: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/8.jpg)
Vegetation of annuals
![Page 9: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/9.jpg)
Waterdunen on the estuary
![Page 10: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/10.jpg)
Terns breeding on artificial sites
![Page 11: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/11.jpg)
Pionieers Hooge Platen
0
100
200
300
1978 1984 1990 1996 2002 2008 2012
bre
edin
g p
airs
(n
)
Little tern Avocet Kentish plover
![Page 12: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/12.jpg)
1982
1986
1990
1994
1998
2002
2008
2012
0
4000
8000
Population development of of gulls and terns
Common tern Sandwich tern Blackheaded gull Mediterrenean gull
![Page 13: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/13.jpg)
Breeding pairs and success of Sandwich tern
0
2000
4000
6000
1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 20110
0,4
0,8
1,2
broedparen (n) broedsucces (juv/paar)
![Page 14: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/14.jpg)
Little tern Common tern Sanwich tern0
25
50
75
100
sandeel herring
Prey items fed to the chicks (left) and partners on the breeding site in three species of terns in the same period.
![Page 15: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/15.jpg)
Terns feed mainly on two species of fish
• Bottomdweller• Poor swimmer• Local• Year round
• Live in shallow water (-20 m)
• Young and adult share partly same feeding ares
H e r r i n g
• From surface to bottom• Fast swimmer• Migrator• Young and subadults near
coast from may-august• Spawning area and nursery
geographical separated• Adults live from the Channel till the Norwegian coast
S a n d e e l
![Page 16: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/16.jpg)
Years of poor reproduction by lack of food:
• Bodyweight of chicks does not increase over days
• Chicks die of starvation• Both parents go out
fishing• Increase of predation
![Page 17: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/17.jpg)
![Page 18: Hooge Platen Nature Reserve Bird island in a shipping channel November 13th-17th, Minsmere, Suffolk Rene Beijersbergen.](https://reader031.fdocuments.net/reader031/viewer/2022013012/5697bfba1a28abf838ca01c3/html5/thumbnails/18.jpg)
So what can we conclude…..
• Feeding sites are getting more and more unpredictable when the function as a nursery for sandeel and herring is becoming less
• Breeding sites (Waterdunen & Zwin) are better off on close distance of nurseries and other spots where small fish aggregrates
• Terns are dependant on small fish for the young chicks and bigger fish for themselves
• The days when producing a clutch and the first days after hatching seems to be the most vulnerable days.