Report of the month - April


History: The nature reserve "Schlammwiss" was founded in 1982 by the foundation"Hellef fir Natur" (HFN). Afterwards the group "Letzeburger Natur- a Vullenschutzliga" (LNVL) founded the station "Schlammwiss". The station is leaded by the "centrale ornithologique Luxembourg" (COL), a part of the asbl. Natur & Emwelt. Due to the fact that Luxembourg doesn't have its own bird ringing central, we work in cooperation with Royal Belgian Instutitute of Natural Sciences. Therefore, we use rings from the Belgian Museum of Natural Sciences.


Location: The bird ringing station "Schlammwiss" is located in Luxembourg, between the communities Schuttrange & Munsbach. The nature reserve is part of the 375ha big Syrvalley and is an extremely important Natura 2000 zone. The reserve is periodicly flooded due to the Syr river, which is an important generator of biodiversity.


Research area: Around 30ha are used for researche, on a length of 1km and a width of 30-120m. The main area is covered by reeds and wetlands (20ha). Furthermore, the resarch area is subdivided and caracterized by an orchard, a forest, several ponds distributed throughout the reedbed and a purification plant (SIAS). The main techniques employed are mist nets and rail traps in order to realize population estimates (i.e. breeding population, migration, overwintering population) and survival estimates by Capture-Mark-Recapture. There are several projects running in the nature reserve and visitation are possible.


Summary of the ringing activity this month

In March, the bird ringing station "Schlammwiss" caught about 914 birds of 44 species. This number is subdivided in 580 E, 260 W and 74 K. 3 bird foreign origin has been caught.


The total amount of birds for the month March is lower (-53) than the average amount of birds caught at the station from 2001-2018 and higher (+104) than the number of last year. The graphic below shows the average amount of birds for each month during the years 2001-2018 in comparison of the numbers of this years, 2018 and the working time for this and last year at the station Schlammwiss.



E:  first capture of this individual

W:  recapture of an individual which was already captured this year

K:  individuals which were ringed one or more years ago or individuals with a foreign country or station


Top 5

1. SYLATR Blackcap 296
2. ERIRUB Robin


3. PHYCOL Chiffchaff 41
4. EMBSCH Reed Bunting 25
5. STUVUL Staring 25

Interesting birds captured:

  • 11 Anthus spinoletta
  • 7 Coccothraustes coccothraustes
  • 3 Luscinia svecica
  • 2 Pica pica
  • 1 Acrocephalus paludicola
  • 1 Gallinago gallinago
  • 1 Luscinia svecica cyanecula
  • 1 Lymnocryptes minimus
  • 1 Porzana porzana
  • 1 Saxicola subetra


Distribution of the age:

Code Amount Definiton
C 14 older than four years
B 10 born four years ago
A 9 older than three years
9 11 born three years ago
8 18 older than two years
7 26 born two years ago
6 51 older than one year


born last year
4 529 age unkown, but not born this year
3 / born this year
2 1 age unknown
1 / nestling

First spring arrivals:

Species Latin Name


(this year)


(last year)


or early

 Blackcap Sylvia atricapilla 17.2 31.3 +42
Water Rail Rallus aquaticus 23.2 31.3 +36
Chiffchaff Phylloscopus collybita 2.3 10.3 +8
Stonechat Saxicola torquata 3.3 17.3 -14
White Spotted Bluethroat Luscinia svecia cyanecula 16.3 25.3 +9
Firecrest Regulus ignicapilla 16.3 9.4 +24
Goldcrest Regulus regulus 23.3 /  
Black Redstart Phoenicurus ochruros 24.3 /  
Willow Warbler Phylloscopus trochilus 30.3 1.4 +2
Spotted Crake Porzana porzana 31.3 /  
Barn Swallow Hirundo rustica 5.4 /  
Savi's Warbler Locustella luscinioides 6.4 10.5 +34
Aquatic Warbler Acrocephalus paludicola 19.4 /  
Whitethroat Sylvia communis 19.4 8.4 -11
Reed Warbler Acrocephalus scirpaceus 21.4 1.5 +10
Lesser Whitethroat Sylvia curruca 21.4 14.4 -7
Grasshopper Warbler Locustella naevia 21.4 /  
Sedge Warbler Acrocephalus schoenobaenus 27.4 7.4 -20
Garden Warbler Syvlia borin 28.4 22.4 -6
Wryneck  Jynx torquilla 28.4 /  


Foreign birds that we controlled this year:

Month Species Country
January Cyanistes caeruleus France
February Parus major Belgium
March Turdus merula Belgium
  Troglodytes troglodytes Belgium
  Erithacus rubecula Sweden
April Parus major Belgium
  Sylvia atricapilla Belgium
  Sylvia atricapilla Spain


The team of the bird ringing station Schlammwiss are mostly volunteers who did an excellent work this month!


 We say thank you for everyone who was helping this month!






In summary we spent around 99 hours during 14 days working at the station.



 We also welcome the visitors on our station:



All our sightings of this month are saved in


Compute total number of birds

Compute total number of observation

The weather information are offered by


Thank you!

Photos of this month

Some photographers sent us their photos which we included into our report.

All other photos are provided by Jim Schmitz.


Thank you for the photos!





Did you take any photos at the station, a visit or of any birds with a ring that could be from our station and want to publish those in the next report of the month?

Contact us!

Anabela Carvalhinho

Kelly Kieffer

Extra story:


In memory of our grand duc Jean




Thanks to the editiors of this report:

Charel Klein

Jim Schmitz, Anabela Carvalho, Kelly Kieffer: Photos;

Cédric Brodin: providing the data

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