Bladder wrack´s life cycle. Every plant bears either male or female receptacles. The plants have a dubble collection of chromosomes - one collection from the mother, the other from the father. Eggs and sperm have only one collection.
Figure 2
Close to the water surface
Endures drought and cold
Home for many
Thread-like algae
take over
Protect themselves with poison and mucus
Eggs and sperms at the top
Bladder wrack without bladders
Bladder wrack
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© Aquascope 2000 Tjärnö Marine Biological Laboratory, Strömstad, Sweden
Bo Johannesson
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Martin Larsvik
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Lars-Ove Loo
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Helena Samuelsson