Algae of the Week: Padina

Padina is a type of brown algae that is native to Hawaii. This type of algae is commonly found on reef flats, tide pools, and intertidal areas usually in mats or clumps. It is easily recognized by its cylindrical branches with constrictions at the intersections. There are seven known species found in Hawaii, two which are endemic. Padina ranges from 20-30 cm tall and are also called “Ear Seaweed” due to their blade like branches. Usually Padina is more abundant during the summer months and can be found between the depths of 1-60 m. The bright white color in its blade like branches is due to the high deposits of calcium carbonate. The calcium carbonate is found on the outer part of the branches in the form of crystals giving it a shiny appearance.

 

References:

John M. Huisman. “Hawaiian Reef Plants.” P 222-225. University of Hawaii Sea Grant College Program

http://www.algaebase.org/search/species/detail/?species_id=1312

http://www.wetwebmedia.com/brnalgae.htm

Halimeda Algae

Known as the “cactus algae”, Halimeda is a type of green algae that inhabits many of the shores of Hawaii. There are approximately thirty modern species known, 7 that inhabit Hawaiian shores, and only 1 which is endemic to Hawaii. Halimeda grow to approximate lengths of 10 cm tall, can be found up to depths of 1-150 meters, and usually are found in the intertidal and subtidal of rocks and corals. Halimeda are known for their ability to synthesize calcium carbonate and also for their coenocytic characteristics. Coenocytes are plants or algae that lack individual cells and instead are thought of as one whole cell with multiple nuclei. Halimeda is a very flexible type of algae composed of segments that are made up of calcium carbonate deposits. Due to its calcium carbonate composition, it is not known for being an edible form of algae for herbivores though some sea slugs are rarely seen feeding on them. Sometimes Halimeda can actually be mistaken for a small mimicking species of fish called a Halimeda Ghostpipefish (picture available). Where ever Halimeda is found this mimicking species can also be present.

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