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Workreport 1997-64

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Name:

Loviisan Hästholmenin luontoselvitys 1997

Writer:

Mikko Siitonen; Jouko Sipari; Pertti Ranta

Language:

Finnish

Page count:

61

Summary:

Working report: Ty”raportti 97-64, Siitonen, M., Sipari, J. & Ranta, P., 59 sivua, suom.kiel.

THE NATURE INVENTORY IN HÄSTHOLMEN AREA (LOVIISA TOWN,
SOUTH FINLAND) IN 1997
ABSTRACT

The aim of the project is to carry out the basic information for environmental impact
assessment (EIA), which was started in the 1997. The main goal is to mitigate or prevent
the harmfull impacts of the construction and maintenance of the final repository of the
nuclear waste for the nature values and recreational profits in the study area.

The study area covers 15,75 km2 including the sea area (5 km2). The botanical and
ecological inventory consist of combination of systematic grid mapping and identifying
and locating the small areas with conservation value. The field survey was made using
grid unit (500 x 500 m). The systematic field study was covered vascular plants,
epiphytic mosses and lichens, biotopes and selected environmental factors. The birdlife
was also inventoried in 1997.

Various applications of reserve selection algorithms were used as a tool for analysing
the data base. As a result of the analysis, every grid unit was classified according to the
importance for biodiversity in landscape ecological level (study area). After that,
ecological priority areas were identified.

The landscape of the study area is characterized by long sea shore and many island with
various biotopes. The commercial coniferous forests, little mires and wetland patches
dominated by black alder are common in the mainland areas. There are numerous
summer houses at the sea shore in the study area. The archipelago applies to the
complete transection from the mainland to open sea.

No populations of nationally endangered plant species were found in the study area.
However, one endangered species on provincial level has been identified in a former
survey. Of the provincially threatened or very rare species, some vascular plants in need
for monitoring were detected. Many key biotope patches and other small areas of high
conservation value were observed, particularly sea shore biotopes, herb-rich or old-
growth forests and nutrient rich mires. Two little areas protected by the law exist in the
study area. A part of the archipelago in the study area has been proposed for the
international Natura 2000 program.

Key words

Plants, biotopes, endangered species, key biotopes, recreational use, ecology, nature
impacts, EIA
Ty”raportti 97-64, Siitonen, M., Sipari, J. & Ranta, P., 59 sivua, suom.kiel.

THE NATURE INVENTORY IN HÄSTHOLMEN AREA (LOVIISA TOWN,
SOUTH FINLAND) IN 1997
ABSTRACT

The aim of the project is to carry out the basic information for environmental impact
assessment (EIA), which was started in the 1997. The main goal is to mitigate or prevent
the harmfull impacts of the construction and maintenance of the final repository of the
nuclear waste for the nature values and recreational profits in the study area.

The study area covers 15,75 km2 including the sea area (5 km2). The botanical and
ecological inventory consist of combination of systematic grid mapping and identifying
and locating the small areas with conservation value. The field survey was made using
grid unit (500 x 500 m). The systematic field study was covered vascular plants,
epiphytic mosses and lichens, biotopes and selected environmental factors. The birdlife
was also inventoried in 1997.

Various applications of reserve selection algorithms were used as a tool for analysing
the data base. As a result of the analysis, every grid unit was classified according to the
importance for biodiversity in landscape ecological level (study area). After that,
ecological priority areas were identified.

The landscape of the study area is characterized by long sea shore and many island with
various biotopes. The commercial coniferous forests, little mires and wetland patches
dominated by black alder are common in the mainland areas. There are numerous
summer houses at the sea shore in the study area. The archipelago applies to the
complete transection from the mainland to open sea.

No populations of nationally endangered plant species were found in the study area.
However, one endangered species on provincial level has been identified in a former
survey. Of the provincially threatened or very rare species, some vascular plants in need
for monitoring were detected. Many key biotope patches and other small areas of high
conservation value were observed, particularly sea shore biotopes, herb-rich or old-
growth forests and nutrient rich mires. Two little areas protected by the law exist in the
study area. A part of the archipelago in the study area has been proposed for the
international Natura 2000 program.

Key words

Plants, biotopes, endangered species, key biotopes, recreational use, ecology, nature
impacts, EIA

Keywords:

kasvit; biotoopit; uhanalaiset lajit; arvokkaat elinympäristöt; virkistys käyttö; ekologia; luontovaikutukset; YVA

File(s):

Loviisan Hästholmenin luontoselvitys 1997 (pdf) (3.1 MB)


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