Dreiersee

B - good

21. June 2026

Habitat StructuresA

CriterionValue
Score charophyceaeA
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)
Middle Macrophyte Limit 4.4 Meter
Lower Macrophyte Limit 5.6 Meter

Overall RatingB - good

Species
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Raue Armleuchteralge

(Chara aspera)

1%

Type: Basic lawn

Gegensätzliche Armleuchteralge

(Chara contraria)

1%

Type: Basic lawn

Zerbrechliche Armleuchteralge

(Chara globularis)

2%

Type: Basic lawn

Hornblättrige Armleuchteralge

(Chara tomentosa)

65%

Type: Basic lawn

Glanzleuchteralgen

(Nitella spec.)

2%

Type: Basic lawn

Stern-Armleuchteralge

(Nitellopsis obtusa)

1%

Type: Basic lawn

Ähriges Tausendblatt

(Myriophyllum spicatum)

1%

Type: Submerged vegetation

Großes Nixkraut

(Najas marina)

1%

Type: Submerged vegetation

Krauses Laichkraut

(Potamogeton crispus)

2%

Type: Submerged vegetation

Stachelspitziges Laichkraut

(Potamogeton friesii)

1%

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