Can I use 0.25 square meter quadrant for estimating density of seaweed?

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K.H.M. Ashoka Deepananda

Yes, you can. You can estimate the percentage coverage of each algae.

Perumal Karthick

Yes you can estimate, if you estimate biomass well and good

Alain Ponsero

I confirm that the sampling 0.25m2 is well suited

Neil Angelo Seniel Abreo

depending on how "scanty" your seaweed is. But you can use quadrat for sure, you just have to figure what size is appropriate. For example, if the seaweeds are scattered or are in patches that you might end up with a lot of empty quadrat if you sample randomly using a small sized quadrat.