bin

North-European brook basin, Sweden

Sponsored by

Sweden, Jämtland, Bräcke

At the base of a small brook, no longer than 50 meters or so, the water collects in a small basin before entering the lake through a small canal walled with reeds. The water is slightly tea tinted from loggs and driftwood. Since the water flows and very few leaf trees surround the basin, it lacks leaf litter and the substrate mainly consist of silt that gets stuck between large, iron-rich, irregular rocks.

The iron-rich rocks that form the banks of the brook allow the iron-rich water to provide the basin with nutrients and  make the shore densely packed with diverse plant life. This makes the area a perfect nursery for fry and small native fish. Many insects also use the area for their larvae, in particular dragonflys which are a great food source when the fish get a little larger.

Submitted by
Karl Olsson
Approved by
Alexey Malyshev & Gireg Allain
GPS
63.0721626, 15.1854296
Geographical region
Northern Europe
Drainage Basin
Ismunden
River catchment
Ismunden
Water body type
Lake
Water body name
Ismunden
Water body part
Pool
Water body course
Water body: tributary of
Hill streams
Tributary name
Ismunden

Water Chemistry

Water information

Water type
Fresh water
Water color
Mixed water
Water transparency
Medium
Concentration of sediments
Medium
Water temperature
16 °C
Water flow/curent
Strong

Chemical parameters

pH
Conductivity
GH
KH
Dissolved Oxygen

Substrate in nature

Sand
None
Pebble/Gravel
Mixed
Stone
Mixed
Stone form
Irregular
Silt/Mud
Orange
Leaves
Few
Driftwood
Few
Submerged terrestrial vegetation
no

Aquatic Biotope

Date of collecting
4/8/2021
Collecting area
Shore line
Water depth
0,5m
Air temperature
20 °C
Sunlight
Full sun

Environment

Environment
Affected by human activity
Affected by human activity
Pollution
Pollution
Moderate
Surrounding area
Underwater landscape

Fish:

  • many Perca fluviatilis
  • many Esox lucius
  • abundant Phoxinus phoxinus
  • few Cottus poecilopus

Molluscs:

  • few Lymnaea stagnalis

Plants:

  • abundant Hippuris vulgaris
  • many Spongilla lacustris
  • many Myriophyllum alterniflorum
  • abundant Sparganium sp.
Threats to ecology

Riparian zone

Trees near the aquatic habitat
Many - a lot of Picea abies, few Betula sp.