Biology Presentation

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Biology Presentation

• Produced by
• Violet Lee S.6C (18)
• 1999-2000

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Mangrove Ecosystem
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What is Mangrove?
Plants growing in saline area where the
substratum is unstable and consists of silt and
mud. The plants are alternatively covered and
exposed to the tides .
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Physical Environment

• Low tide
• High salinity
• pH-slightly basic
• High organic matter
• Water logged

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Adaptations of AnimalCommunities
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Problem of unstable substratum

• Attached to tree trunks
• Make burrows

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Problem of low oxygen content

• Building burrows with water circulating through
  these burrows
• Possess haemoglobin in body fluid
• Respire through body surface

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Problem of high salinity

• Body fluid is isotonic to sea water
• uric acid waste
• Hard impermeable shell
• Build burrows
• Mantle cavity to store water

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Adaptation of PlantCommunities
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Problem of anchorage

• Prop roots
• Buttress root
• Cable roots
• droppers

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Problem of water logged

• roots are negative geotropism
• Roots with lenticels
• Roots with air spaces

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Problem of high salinity

• Salt glands in the leaves
• Possess xerophytic adaptations

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Food web in mangrove
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Local Sites of Mangrove

• Sai Keng
• Ting Kwok Road
• Mai Po

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Mai Po Location Map
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Mangrove in Mai Po
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Significance of Wetland

• Act as wildlife habitat

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Significance of Wetland

• Water purification
• Highly productivity eg. gei wai shrimps

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Pollution Problem in Mai Po

• Waste produced by human and animals
• Toxin materials
• Huge amount of organic matter

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