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					The Freshwater
Stream habitat
The Freshwater Stream habitat

Station 1 : Fast Running Water

Station 2 : Slow Running Water
 Physical factors
  1.   Light intensity
  2.   Temperature
  3.   Current speed


• Chemical factors
      Light intensity
                 Light intensity in different regions of 2 stations

               100
                90
                80      74
                70           69        68
                60                          60     59   58
Relative light
                50
  intensity                                                           fast running water
                40
                30                                                    slow running water
                20
                10
                 0
                     above surface   underneath    bottom
                                       surface
                                      Regions
                                                                      Physical factors
   Temperature
                   Temperature in different regions of 2 stations

           30
                             25.7
           25                                23.7
                                                             21.3
                      19.8            19.5            19.3
           20

Temperature 15                                                      fast running water
                                                                    slow running water
           10

             5

             0
                 underneath surface   mid-depth        bottom
                                      Regions                   Physical factors
Chemical factors
Chemical factor                 Station 1 (fast running water) Station 2 (slow running water)
Total suspended solids (p.p.m.)             0.0119                          0.025
Phosphate content (p.p.m.)                   0                             0.9
Ammonia content (p.p.m.)                   0.073                          0.085
Dissolved oxygen (p.p.m.)                   8.1                             8
Conductivity (umhos)                        12                             15
pH                                          6.2                            6.4




                                                                   Physical factors
   Current speed
             Current speed in different regions of 2 stations

               0.4
              0.35
               0.3
Current speed 0.25
               0.2                                      fast running water
    (m/s)     0.15
               0.1                                      slow running water
              0.05
                 0
                     surface Mid- bottom
                             depth
                               Regions
                                                        Physical factors
      Biotic Factor
Found in:
      Station 1~Fast Running Water

     Station 2~Slow Running Water
           Biotic Factors
                                   Animals

•Mayfly nymph    •Large stream
                 snail &
•Damselfly nymph Reservoir snail
                 •Common      •Freshwater crab
•Caddisfly nymph
                 freshwater
•Blood worm      shrimp & Long-
                 armed shrimp
 •Water skater
                 Mayfly nymph
Location:
Under rock

Number:~
Fast water: 10
Slow water:15

Adaptive Features:
~3 long tail filaments
~lateral abdominal
feathery gills
                                Biotic factor
    Damselfly nymph

Location:
Under rock

Number:~
Fast water: 0
Slow water: 2

Adaptive features:
~carnivore, easy to catch


                            Biotic factor
Caddisfly larva
         Location:
         Under Rock

         Number:~
         Fast water: 15
         Slow water:13

         Adaptive features:
         ~live in case made of sand with
         hooked by its terminal claspers

                          Biotic factor
                 Blood Worm
Location:
Under Rock/ in bottom
sediments
Number:~
Fast water: 7
Slow water:10
Adaptive features:
~blood gills
~red in colour                Biotic factor
                Water Skater
Location:
On water surface

Number:~
Fast water: 0
Slow water: 5

Adaptive features:
~long, thin legs
~hair on legs
~thin, flattened body
                               Biotic factor
Large stream snail & Reservoir snail

Location:
Under Rock

Number:~
Fast water: 5
Slow water: 9

Adaptive features:
~have operculum
~get chemical to make
operculum
                          Biotic factor
Common freshwater shrimp &
Long armed shrimp
Location:
On bottom

Number:~
Fast water: 0
Slow water: 3

Adaptive features:
~white, creamy pink or grey
brown in colour
~more than 3 pairs of legs
~flattened body               Biotic factor
                Freshwater crab
Location:
On bottom

Number:~
Fast water: 0
Slow water: 1

Adaptive features:
~have abdomen greatly reduced
~males have a narrow abdomen with the first pair of
appendages modified into a penis
~females have a broad abdomen under which the egg-
mass is carried at breeding time
                                                 Biotic factor
          Mosquito fish

Location:
Free swimming

Number:~
Fast water: 12
Slow water: 35

Adaptive features:
                 Guppy

Location:
Free swimming

Number:~
Fast water: 7
Slow water: 13

Adaptive features:
~female is drab olive-brown in colour
~male show a tremendous diversity in colour
                                              Biotic factor
                          Goby
Location:
On water bottom
Number:~
Fast water: 0
Slow water:4

Adaptive features:
~the pelvic fins are united into
an oval disc which serves as a
sucker
~mouth is large for attacking
                      Loach
Location:
On bottom
Number:~
Fast water: 8
Slow water: 15
Adaptive features:
~elongated and
compressed body
~3 pairs of barbels           Biotic factor
Plant

 •Algae
 •Taro

 Spirodela polyrhiza schleid
Algae
Type: Algae

At any one time,
a particular species of
alga
may be very abundant,
forming
 an algal “bloom”
    Taro
Type: Waterside
These plants grow
at the side of the
water or else are
rooted in the
shallow water at the
edge, but have all or
most of their foliage
protruding aerially.
    Spirodela Polyrhiza Schleid
Type:
Floating freely on
water

These plants are not
 associated with the
sea bed
at all and have roots
dangling
 in the water.
4o consumer                    Goby           Hong Kong Newt

                                      Guppy
3o consumer        Crab
                                                     Mosquito
                                                     fish
2o consumer               Damselfly
                          nymph                   Water
                                                  skater
                                                                   Shrimp
                                  loach
1o consumer                                                Blood
              Caddisfly                     Mayfly
                               Large                       worm
              larva                         nymph
                               stream
                               snail
                                                              Detritus
Producer          Phytoplanton            Algae
Hong Kong newt
Location :
on the of river
Behavior :
nocturnal habit

Characteristic:
orange red
pot on the
ventral side
Thanks to our tutors:
~Mr. Wai
~Mr. Kan
and all the technicians

				
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