Biotic Factor
Found in:
Station 1~Fast Running Water
Station 2~Slow Running Water
Biotic Factors
Mayfly nymph
Animals
Water skater
Damselfly nymph
Caddisfly nymph
Alderfly larva
Blood worm
Large stream
snail &
Reservoir snail
Common
freshwater
shrimp & Longarmed shrimp
Biotic Factors
Freshwater crab
Plants:
Goby
Alocasia
Mosquito fish
Colocasia esculenta
Water dragon
Guppy
Loach
Wild rice
Carex
Mayfly nymph
Location:
Under rock
Number:~
Fast water: 10
Slow water:15
Adaptive Features:
~3long tail filament
~lateral abdominal
feathery gills
Damselfly nymph
Location:
Under rock
Number:~
Fast water: 0
Slow water: 2
Adaptive features:
~carnivore, easy to catch
Caddisfly larve
Location:
Under Rock
Number:~
Fast water: 15
Slow water:10
Adaptive features:
~live in case made of sand with
hooked terminal claspers
Alderfly larva
Location:
Under Rock
Number:~
Fast water: 4
Slow water: 7
Adaptive features:
~large biting mandibles
~8 pairs of lateral filaments on abdomen
Blood Worm
Location:
Under Rock/ in bottomm
sediments
Number:~
Fast water: 7
Slow water:10
Adaptive features:
~blood gills
~red in colour
Water Skater
Location:
On water surface
Number:~
Fast water: 0
Slow water: 5
Adaptive features:
~long, thin legs
~hair on legs
~thin, flattened body
Large stream snail & Reservoir snail
Location:
Under Rock
Number:~
Fast water: 5
Slow water: 9
Adaptive features:
~have operculum
~get chemical to make
operculum
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
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 eggmass is carried at breeding time
Goby
Location:
Free swimming
Number:~
Fast water: 0
Slow water:4
Adaptive features:
~appearance and size
~mouth is large for attacking
Mosquito fish
Location:
Free swimming
Number:~
Fast water: 12
Slow water: 35
Adaptive features:
~change colour to match surrounding
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
Loach
Location:
On bottom
Number:~
Fast water: 8
Slow water: 15
Adaptive features:
~elongated and
compressed body
~3 pairs of barbels
Alocasia odora
Type:
Waterside
Number:~
Fast water: 1
Slow water: 0
Adaptive features:
~Leaves oval
Colocasia esculenta
Type:
Waterside
Number:~
Fast water: 12
Slow water: 15
Adaptive features:
~leaves oval to slightly shield-shaped
~20-50cm in diameter
Water Dragon
Type:
Rooted in stream bed,
but with protruding foliage
Number:~
Fast water: 3
Slow water: 0
Adaptive features:
~each node bearing a number of
white, fleshy, cylindrical, sac-likee
devices
for respiration and floatation
Wild rice
Type:
Waterside
Number:~
Fast water:15
Slow water:18
Adaptive features:
~rhizome stout, with fibrous roots
~stem erect with adventitious roots
Carex
Type:
Waterside
Number:~
Fast water: 17
Slow water:20
Adaptive features:
~leave narrow and linear
~flower stalks sharply triangular
Thanks to our tutors:
~Mr. Wai
~Mr. Kan
and all the technians
