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     WHY  SEA-BEANS  FLOAT
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Images of sliced open sea-beans.
Many sea-beans have air pockets which assist with floatation.

Hamburger Bean
Hamburger Bean
Mucuna sloanei
Seaheart
Seaheart
Entada gigas
Nickarnut
Nickarnut
Caesalpinia bonduc
Golf Ball
Golf Ball; Sea Coconut
Manicaria saccifera
Blister Pod
Blister Pod
Sacoglottis amazonica

Air pockets are not the only reason that sea-beans float. Other drift seeds may lack air pockets, but simply be constructed of materials that are lighter than water. Note that sea water is denser than fresh water, because of the dissolved salts. Some seeds that sink in fresh water may be able to float in the denser sea water. Some seeds drop directly into sea water, or are washed off of beaches from oceanic waves. Other seeds that fall in the jungles will have to be light enough to first float in fresh water in order to make their journey down streams and rivers to get to the sea water of the oceans.


Close-up of interior of the Antidote Vine seed, Fevillea cordifolia.
This seed, although fairly solid inside, must be less dense than seawater... thus, it floats!


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