Dreiersee

B - good

10. October 2026

Habitat StructuresB

CriterionValue
Score charophyceaeB
Number of different typically formed accretion structures, such as swamp forest, willow bushes, reeds, etc. A

Species Inventory – Habitat TypicalA

CriterionValue
All stoneworts, higher water plants with a trophic index < 2.5 – see species table A

ImpairmentsB

CriterionValue
Impairment moderately pronounced, rough hornwort, bumpy water lentil-floating mats see species table A
Anthropogenic Influences on >25% of the surveyed area
Natural Shore Accretion absent on 10-50% of the shoreline
Lower macrophyte boundary B
(Lower Macrophyte Limit)
Shallow Water Macrophyte Limit 2.3 Meter
Middle Macrophyte Limit 3.7 Meter
Lower Macrophyte Limit 5.7 Meter

Overall RatingB - good

Species
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Gegensätzliche Armleuchteralge

(Chara contraria)

2%

Type: Basic lawn

Zerbrechliche Armleuchteralge

(Chara globularis)

1%

Type: Basic lawn

Hornblättrige Armleuchteralge

(Chara tomentosa)

35%

Type: Basic lawn

Stern-Armleuchteralge

(Nitellopsis obtusa)

1%

Type: Basic lawn

Ähriges Tausendblatt

(Myriophyllum spicatum)

1%

Type: Submerged vegetation

Großes Nixkraut

(Najas marina)

3%

Type: Submerged vegetation

Krauses Laichkraut

(Potamogeton crispus)

3%

Type: Submerged vegetation

Kamm-Laichkraut

(Stuckenia pectinata)

2%

Type: Submerged vegetation

Weidengebüsch

(Salicion elaeagni)

Type: Shore vegetation

Röhricht

(Phragmites australis)

Type: Shore vegetation

Erlen-Bruchwald

(Alnetea glutinosae)

Type: Shore vegetation