Ru Runion nion Is Islan land d Prese resentation ntation - - PowerPoint PPT Presentation

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Oct 26, 2022 405 likes •671 views

Ru Runion nion Is Islan land d Prese resentation ntation Bio-indication In Runion Island How to determine the water quality of a river ? I Thanks to fish II Thanks to macro invertebrates I - Fish INDIAN OCEAN Reunion

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Réu Réunion nion Is Islan land d Prese resentation ntation

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Bio-indication

In Réunion Island

How to determine the water quality of a river ?

I – Thanks to fish II – Thanks to macro invertebrates

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I - Fish

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INDIAN OCEAN Fish migration Reunion island

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Larvas Growth Reproduction and larval life

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Differents methods of sampling

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How to know Reunion island rivers quality through the study of fish population ?

Station to be qualified Sampling with electricity

Characteristics Reference models

GOOD OR NOT ?

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II- Macro invertebrates

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St-Etienne River

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Take macro invertebrates in the river

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Find the macro invertebrates

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Observation & Indentification

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Taking Photos

Midge Larva

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Caddisfly Larva

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Dragonfly Nymph

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Give a quality mark for the river

8 Points 1 Point

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4 points 3 Points 3 Points

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Mark

4 + 6 + 8 + 1 = 19

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Our rivers seem to be in a good condition!

Interpretation :

But here we only studied micro-invertebrates.

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Conclusion :

Micro-invertebrates : GOOD STATE. But what about fishes and micro-flora?

3 BIO-INDICATORS:

Macro-invertebrates
Fishes
Micro-flaura

In Reunion island :

BAD INDICATOR GOOD INDICATOR BAD INDICATOR

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Macro-invertebrates:

Really good Good So so Bad Really bad Really good Good So so Bad Really bad Worst Better No changes No information about 2012 Worst Better No changes No information about 2012

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:

Really good Good So so Bad Really bad Worst Better No information about 2012 Worst Better No changes

Fish

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Micro-plants :

Worst Better No changes Really good Good So so Bad Really bad

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