Geen diatitel

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Practical management for marsh and meadow birds
in the LIFE-reserve the Ilperveld choices
between conflicting ecosystems? Ron van t
Veer
Landschap Noord-Holland (The Netherlands)
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Introducing the area
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Natura 2000 reserves with Marsh Meadow
birds
Eilandspolder
Wormer- en Jisperveld
Oostzanerveld
Polder Westzaan
Ilperveld
Varkensland
Twiske
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Ilperveld/Varkensland/Oostzanerveld/Twiske 24 km2
Wormer- Jisperveld/Kalverpolder - 18 km2
Eilandspolder - 14 km2
Polder Westzaan - 11 km2
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De veender the peatdigger der Torfgräber le
tourbier
Jan Luyken, 1693
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Introducing the players
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MARSH BIRDS Key species
Great bittern Botaurus stellarus Roerdomp
Objective gt 10 bp Ilperveld etc
MEADOW BIRDS Key species
Black-tailed Godwit Limosa limosa Grutto
Sleeping resting places
gt 3500 individuals
NL gt 20 bp each 1 km2
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MEADOW BIRDS
Common snipe Gallinago gallinago Watersnip
Objective Conservation of Breeding Habitat
Ruff Philomachus pugnax Kemphaan
Objective gt10 bp Wormer- Jisperveld
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MARSH BIRDS
Objective Conservation of Breeding Habitat
Savis warbler Locustella luscinioides Snor
Spotted Crake Porzana porzana Porseleinhoen
Marsh Harrier Circus aeruginosus Bruine
Kiekendief
Reed Warbler Acrocephalus schoenobaenus Rietzanger
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Redshank Tringa totanus Tureluur
MEADOW BIRDS
Objective NL Total of meadow birds gt 75 bp /
1 km2
Lapwing Vanellus vanellus Kievit
Oystercatcher Haematopus ostralegus Scholekster
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Nature restoration In the Ilperveld

• Problems
• Acidification of breeding habitat
• Black-Tailed Godwit and Common Snipe

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Nature restoration In the Ilperveld

• Problems
• Shortage of wet reedland-habitat for Great
• Bittern ( expecting breeding habitat pro-
• blems in the near future)
• Highly eutrophicated and murky waters

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Breeding locations of Great Bittern 1973
2005
After 1997
1973-1997
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Breeding locations of Great Bittern 1973
2005
Occupation history
low
high
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Breeding locations of Great Bittern 1973
2005
Occupation history
low
high
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Nature restoration In the Ilperveld

• Aims
• Habitatrestoration for Black-Tailed
• Godwit restoration of the breeding
• and feeding habitats
• Increase of habitat for Great Bittern
• Restoration of eutrophicated waters
• decrease of nutrients, more small fish
• Restoration of acidified fen-vegetation

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Projects

• restoration of grasslandhabitat for
• Black-tailed Godwit 2 km2
• - Peat removal in 35 former peat
• excavation sites open water
• increase young fen-vegetation
• (Great Bittern)
• - 2 km of wet Reed fringes were created
• for Great Bittern

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Creation of young reedlands in shallow
waters Fen/Bittern habitat
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Sod cutting in dry reedlands Bittern habitat
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Peat removal in 35 former peat excavation
sites Chara-vegetation/fen vegetation
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Projects

• restoration of grasslandhabitat for
• Black-tailed Godwit 2 km2
• - Peat removal on 35 former peat
• excavation sites open water
• increase young fen-vegetation
• (Great Bittern)
• - 2 km of wet Reed fringes were created
• for Great Bittern
• Initiate a program to decrease the
• area of eutrophicated waters

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Projects

• restoration of grasslandhabitat for
• Black-tailed Godwit 2 km2
• - Peat removal on 35 former peat
• excavation sites open water
• increase young fen-vegetation
• (Great Bittern)
• - 2 km of wet Reed fringes were created
• for Great Bittern
• Initiate a program to decrease the
• area of eutrophicated waters
• We have build a stable for grassland-
• and reedland-management

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Research
- Great Bittern stable breeding habitats should
have an area of 0,01 - 0,05 km2

• feeding habitat must be present wet reed
  fringes,
• clear shallow waters or inundated graslands with
  fen-vegetation are needed

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Polder Westzaan
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Polder Westzaan
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Wormer- en Jisperveld
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Research

• Black Tailed Godwit stable breeding habitats
  should have an area of 0,5 to 1 km2, without many
  reed fringes of regular mowed reed fringes

- Black Tailed Godwit the best breeding
habitats in North-Holland are grasslands without
many reed fringes
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Zeevang
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Density of Black-tailed Godwit in the Ilperveld
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Low diversity of birds High density of meadow
birds
High diversity of birds Low density of meadow
birds
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Conclusions

• Objectives for Meadowbirds Marsh birds can be
  combined in Natura 2000 reserves

• But the balance is fragile and careful planning
• of both grassland and reedland management
• is needed

• Zonation is a must!

• 2-5 years old reedlands must be wet to avoid
  predators