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The site was identified as important in 2009 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List1	Season	Year(s)	Size	IBA criteria
Black Stork Ciconia nigra	LC	non-breeding	1993-2009	4-16 individuals	C6
Boreal Owl Aegolius funereus	LC	breeding	1995-1998	1-2 breeding pairs	C6
Hen Harrier Circus cyaneus	LC	winter	1990-2005	5-10 individuals	C6
Red Kite Milvus milvus	LC	breeding	1997-2009	3-5 breeding pairs	C6

1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2009) may differ.

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2009. The most recent assessment (2009) is shown below.

State (condition of the trigger species' populations)
Species	Reference	Actual	Units	% remaining	Result
Common Quail Coturnix coturnix	7	7	males	100	favourable
Black Stork Ciconia nigra	16	16	individuals	100	favourable
Circus cyaneus	6	6	individuals	100	favourable
Red Kite Milvus milvus	3	4	breeding pairs	100	favourable
Whinchat Saxicola rubetra	20	2	-	10	very unfavourable
Meadow Pipit Anthus pratensis	19	2	-	11	very unfavourable
Motacilla flava	15	2	-	14	very unfavourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happening now	majority/most of area/population (50-90%)	slow but significant deterioration	high
Natural system modifications	happening now	small area/few individuals (<10%)	very rapid to severe deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Protected areas	Management plan	Other action	Result
Whole area of site (>90%) covered by appropriate conservation designation	No management planning has taken place	Some limited conservation initiatives are in place	low

Year	Protected Area	Designation	% overlap with IBA
1965	Parc naturel de l'Our / Naturpark Our	Parc Naturel	98
1981	Hachiville-Kouprich	Humid Zone Buffer Zone	1
1981	Hachiville-Kouprich Wetland	Humid Zone	<1
1981	Hachiville-Am Dall	Humid Zone	6
1988	Wincrange - Ramescher	Protected Area	21
1989	Troine-Hannerhaassel	Humid Zone	2
1993	Ramescher (Wincrange)	Zones protégées d'intérêt national - Réserve naturelle	2
1996	Vallée de la Tretterbaach	Site of Community Importance (Habitats Directive)	13
1996	Hoffelt - Kaleburn	Site of Community Importance (Habitats Directive)	3
1996	Troine/Hoffelt - Sporbaach	Site of Community Importance (Habitats Directive)	2
2002	Vallée de la Tretterbaach et affluents de la frontière à Asselborn	Zones protégées d'intérêt communautaire - Zones Oiseaux ZPS	93
2004	Vallée de la Tretterbaach et affluents de la frontière à Asselborn	Special Protection Area (Birds Directive)	93
2004	Vallée de la Tretterbaach	Zones protégées d'intérêt communautaire - Zones Habitats ZSC	13
2004	Hoffelt - Kaleburn	Zones protégées d'intérêt communautaire - Zones Habitats ZSC	3
2004	Troine/Hoffelt - Sporbaach	Zones protégées d'intérêt communautaire - Zones Habitats ZSC	2
2017	Sporbaach	Protected Area	3
2017	Kaleburn	Protected Area	3

Habitat1	Habitat detail	% of IBA
Grassland	Humid grasslands, Mesophile grasslands	64
Artificial/Terrestrial	Arable land, Forestry plantations, Other urban and industrial areas, Ruderal land	26
Forest	Alluvial and very wet forest, Broadleaved deciduous woodland, Mixed woodland	7
Shrubland	Heathland, Scrub	2
Wetlands (inland)	Rivers and streams, Standing freshwater	1

1. IUCN Habitat classification.

Land use	% of IBA
rangeland/pastureland	64
agriculture	18
forestry	14
hunting	major (>10)
tourism/recreation	minor (<10)
nature conservation and research	minor (<10)

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Valley of the Trëtterbaach (Luxembourg). Downloaded from https://datazone.birdlife.org/site/factsheet/valley-of-the-trëtterbaach-iba-luxembourg on 23/11/2024.