group 2 presentationifieldstudy.net/reports/stream/files/stream07e-shrink.pdf · group 2...
TRANSCRIPT
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G R O U P 2 P R E S E N TAT I O NR A C H E L YA N P H O E B E M A K P H O E B E Y U L E E W I N G S U M
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L A R G E S T R E A M S N A I L
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D I S T R I B U T I O N
• Slow water flow: 12
• Fast water flow: 7
• Explanation: easily washed away by quick stream
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A D A P TAT I O N
• Sucker-like structure
• Hiding under rocks
• Bearing hard shell
• --> avoid and defend against predators
• Graze on firm substrates (rocks, woody debris)
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F E E D O N :
- small bits of algae and organic debris found on the bottom and sides of the river channel or lake
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S U C K E R - B E L LY L O A C H
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D I S T R U B U T I O N
• Slow water flow: 4
• Fast water flow: 0
• Found on rock surfaces
• Explanation: difficult to resist the strong water current
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P R E D A C E O U S C H U B
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A B U N D A N C E O F F I S H
Predaceous Chub
Red Cheek Goby
Sucker belly Loach
Broken band Hillstream Loach
Banded Forktailed Loach
0 2.5 5 7.5 10
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• PREDACEOUS CHUB
• one the commonest freshwater fishes found in local unpolluted streams
• The body: with a distinct black mid-lateral band and ends with a black spot. The black band becomes less prominent in adult.
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A D A P TAT I O N
• Sucker like structure
• Streamlined or flattened body
• Smooth body surface
• Fins
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AV O I D A N D D E F E N D A G A I N S T P R E D AT O R S
• Camouflage
• Hide between crevice
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A D A P TAT I O N ( FA S T R U N N I N G W AT E R )
S U C K E R - B E L LY L O A C H
L A R G E S T R E A M S N A I L
P R E D A C E O U S C H U B
S U C K E R L I K E S T R U C T U R E
+ +
S M O O T H B O D Y S U R FA C E
+
S T R E A M L I N E D B O D Y
+ +
F L AT T E N E D B O D Y
+ +
H I D E U N D E R R O C K S
+ +
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A N T I - P R E D AT I O NS U C K E R - B E L LY
L O A C HL A R G E S T R E A M
S N A I LP R E D A C E O U S
C H U B
H I D E U N D E R R O C K S
+ +
Q U I C K R E A C T I O N
+
H A R D S H E L L S +
C A M O U F L A G E + +
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I N T E R R E L AT I O N S H I P
• Competition
• Different species of fish compete for food
• E.g. Microorganisms, plant and algae