how organisms adapt to different water flow speed

Presentation on theme: "how organisms adapt to different water flow speed"— Presentation transcript:

1 how organisms adapt to different water flow speed
Investigation of organisms' behaviour

2 Used method and materials
light meter water flow meter digital thermometer brush pen metal sieve white tray ruler

3 results 0m/s 0.11m/s 0.7m/s 1046x10 lux 1100x10 lux 1002x10 lux 20.6°C
site1 site2 site3 water flow rate 0m/s 0.11m/s 0.7m/s light intensity 1046x10 lux 1100x10 lux 1002x10 lux temperature 20.6°C 20.4°C 20.7°C water depth 22cm 19cm 11cm

4 site1-water flow rate: 0m/ s
behaviour large stream snail(海南蜷螺) stick on the rocks' surface 魚苗 自由游動

5 site2-water flow rate: 0.11m/ s
behaviour 黽蝽 「站」在水面上，不斷前後划動 SMall long-armed shrimp(海南沼蝦) hide under the rocks or gaps between the rocks schistura fasciolata(橫紋南鰍) hide under the rocks (海南蜷螺) stick on the rocks' surface

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7 site3-water flow rate: 0.7m/ s
behaviour water penny(水錢) 呈吸盤狀，附在石面 large stream snail(海南蜷螺) stick on the rocks' surface damselfy larvae(豆娘若蟲) hide under the rocks mayfly nymph(蜉蝣若蟲) 擬平鰍 具吸盤，伏在水底沙及石面 (石蛾幼蟲) hide inside their nests 麥氏擬腹吸鰍 圓形吸盤，伏在水底沙及石面

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9 errors & limitations We studied the three localities one by one. Light intensity changed with time. For high-speed stream, water was too shallow that the water flow meter was not completely immersed. Given limited time, presence of plants is not taken into consideration. We have insufficient experience to figure out all species present.