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Potential groundwater dependent ecosystems (habitats) in the Latvian pilot area Kazu grava
Agnese PriedeNature Conservation Agency, Latvia
Priekuļi, Latvia
09/11/2018
Suggested borders of the pilot area (ca. 60 ha)
Similar to the borders of Kazu ieleja Nature Monument (protected nature area of national
importance, overlapping with Gauja National Park – Natura 2000 site)
Suggested borders of the pilot area (ca. 60 ha) includes
◆ deciduous and mixed forests on steep slopes (non-GDTEs) with
tufa-forming springs (potential GDTEs) including
- wet patches around spring discharges on slopes (potential
GDTE) and barrage tufa formations on steep slopes,
- spring waterfalls (potential GDTE),
◆ drained mesic to wet fen grassland on peat soil on the bottom of
the valley (potential GDTE),
◆ artificial ponds and pits created by tufa excavation and by peat
excavation (non-GTEs),
◆ small patches of other habitats (non-GDTEs).
Though Kazu grava is well known as an area rich in rare plant species and
habitats, important bat area (dolomite caves)… the data are insufficient and
outdated.
What we have in the national nature data system OZOLS:
⚫ two patches of Petrifying springs with tufa formation (EU habitat 7220*),
⚫ one patch of Calcareous rocky slopes… (EU habitat 8210),
⚫ localities of rare plant and some animal species (all?).
Though Kazu grava is well known as an area rich in rare plant species and
habitats, important bat area (dolomite caves)… the data are insufficient and
outdated.
What we have in the national nature data system OZOLS:
⚫ two patches of Petrifying springs with tufa formation (EU habitat 7220*),
⚫ one patch of Calcareous rocky slopes… (EU habitat 8210),
⚫ localities of rare plant and some animal species (all?).
Particular species – what we know for sure (but maybe there are more)
Importance for bats (caves)! … but this is out of the scope of GDTE methodology.
Rare, protected plant species
Cypripedium
calceolus
In this area, on slope,
not related to GDTEs.
Several other
orchids
Largely related to
GDTEs (but not all of
them).
Primula farinosa
Largely related to
GDTEs (calcareous
fens).
Stellaria crassifolia
Largely related to
GDTEs (spring
mires).
Gymnocarpium
robertianum
On tufa cliffs and
calcareous rocky
slopes. Not related to
GDTEs.
Habitats – petrifying springs with tufa formation (7220*) – GDTE
Plant communities:
Cratoneurion commutati
Carici remotae
Habitats – ponds, pits, fen grassland, carbonatic rocky slope, slope forests (some are
potential GDTEs)
Plant communities:
Scheuchzerio-Caricetea fuscae
Phalaris arundinacea community
Other?Plant
communities:
Alno-Ulmion
Tilio-Acerion
Disturbed and newly created habitats
Since some habitats in Kazu grava are heavily disturbed or destroyed-newly created,
but perhaps still/already valuable. It is worth to think about their value from biodiversity
conservation point of view. In most cases, they do not fall into the category of EU habitat
types. But they can be important for rare, protected species.
Are they/can they be GDTE or not?
Current plan for exploring the site (biodiversity aspect)
⚫ Mapping of EU habitat types (listed in the Annex I of Habitats Directive) by using the
national methodology (identification key, field forms);
⚫ Vegetation sample plots in spring habitats and fen grassland (establishment of at
least five 0,2 x 0,2 m (springs) to 1 x 1 m (fen grassland) vegetation plots in each
location around the groundwater monitoring wells, Braun-Blanquet method), vascular
plants + mosses;
⚫ Invertebrate communities (sampling at selected locations, the same where the
vegetation will be described);
⚫ Correlation of abiotic and biotic data (hopefully, will be possible);
⚫ Selecting indicators for identification of GDTEs (for those type we will find in Kazu
grava);
⚫ Selecting of indicators for GDTE quality and degree of disturbance (for those
types we will find in Kazu grava).
Outcome
⚫ Understanding of whether we can use only EU habitat maps and field form data or
more detailed information (vegetation, etc.) is necessary to identify GDTE and their
quality.
⚫ Improved knowledge on vegetation composition and invertebrate communities in
spring habitats.
Thank you!