E F F E C T S O F R I V E R B E D S U B S T R AT E C O M P O S I - PowerPoint PPT Presentation

A N I M A L S P E C I E S A S S O C I A T E W I T H R I V E R B E D S U B S T R A T E E F F E C T S O F R I V E R B E D S U B S T R AT E C O M P O S I T I O N O N T H E A N I M A L S

H Y P O T H E S I S The larger the size of substrates, the more the animal species can be found.

M AT E R I A L S • Light meter • Water flow meter • Digital thermometer • Metal sieve • Quadrat

M E T H O D S R I V E R B E D We have chosen 3 quadrats for sampling. S U B S T R AT E -Estimate the relative C O M P O S I T I O N amount of different subtrates -Measure the diameter of substrate particles

Observe the animal species in the three quadrets M E T H O D S A N I M A L S P E C I E S

VA R I A B L E S Independent variable : River bed substrate composition Dependent variable : animal species Controlled variables: water flow rate Water depth Light intensity Abundance of water plants

Controlled Apparatus Variables M E T H O D S C O N T R O L L E D Digital Temperature VA R I A B L E S Thermometer Light Intensity Light Meter Water Flow Rate Water Flow Rate Meter

M E T H O D S C O N T R O L L E D VA R I A B L E S Variables/Quadrat 1 2 3 Temperature 24.8(Water) 20.9 (Water) 21.6(Water) （ Degree Celsius ） 25.1(Air) 24.6 (Air) 24.3 (Air) Light Intensity 260 X 100 270 X 100 220 X 100 Water Flow Rate 0.21 0.20 0.29 (M/S)

R E S U LT S R I V E R B E D S U B S T R AT E C O M P O S I T I O N Quadrat 1 3 2 Mud And Sand Medium Much Much Granule And Medium Many Medium Pebble Cobble And Many Few Medium Boulder

R E S U LT S - A N I M A L S P E C I E S Q U A D R AT 1 • G O B Y • S U C K E R - B E L LY L O A C H • T O O T H E D B E E S H R I M P • WAT E R S K AT E S

R E S U LT S Q U A D R AT 2 • WAT E R S K AT E R • L A R G E S T R E A M S N A I L

Q U A D R A T 3 🙆

A N A LY S I S T H E L A R G E R T H E S I Z E O F S U B S T R AT E S PA R T I C L E S , T H E M O R E T H E A N I M A L S P E C I E S C A N B E F O U N D .

A N A LY S I S T H E L A R G E - S I Z E D PA R T I C L E S P R O V I D E S H E LT E R F O R A N I M A L S .

T H A N K Y O U ❤️ ❤️ 🐢 🐍 🐛 🐠 🐹 🐎