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 april, the bird ringing station "Schlammwiss" caught about 759 birds of 41 species. This number is subdivided in 461 E, 209 W and 89 K. None bird foreign origin has been caught.


The total amount of birds for the month  is higher than the average amount of birds caught in april at the station. The graphic below shows the average amount of birds for each month during the years 2001-2014.



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 125
2. COCCOC Hawfinch 94
3. CARCHL Greenfinch 44
4. EMBSCH Reed bunting 36
5. STUVUL Starling 32

Interesting birds captured:

  • 14 Anthus spinoletta
  • 1 Dendrocopus medius
  • 3 Dendrocopos major
  • 1 Picus viridis
  • 1 Acrocephalus arundinaceus
  • 4 Acrocephalus schoenobaenus
  • 1 Garrulus glandarius
  • 94 Coccothraustes coccothraustes

First spring arrivals:

Species Date
Phylloscopus collybiata 10.3
Phoenicurus ochruros 24.3
Luscinia svecica 25.3
Rallus aquaticus
Sylvia atricapilla 31.3
Phylloscopus trochilus
Acrocephalus schoenobaenus 7.4
Sylvia communis 8.4
Regulus ignicapilla 9.4
Sylvia curruca 14.4
Luscinia megarhynchos 21.4
Acrocephalus arundinaceus 22.4
Sylvia borin 22.4


Distribution of the age:

Code Amount Definiton
C 6 older than four years
B  11 born four years ago
A 8 older than three years
9 17 born three years ago
8  12 older than two years
7  21 born two years ago
6  90 older than one year
5  232 born last year
4  362 age unkown, but not born this year
3 / born this year
2  / age unknown
1 / nestling

Foreign birds that we controlled this year:

Month Species Country
January / /
February Sturnus vulgaris Beglium
March Phylloscopus collybita Belgium
  Phylloscopus collybita Belgium
  Emberiza schoeniclus France
April / /


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 57 hours during 13 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

Extra story:



Thanks to the editiors of this report:

Charel Klein

Jim Schmitz, Cédric Brodin, Max Steinmetz