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Nereocystis is a brown macroalgae that derives chemical energy from photosynthesis. Nereocystis in particular, similar to Pelagophycus porra, can be identified by a single large pneumatocyst between the end of its hollow stipe and the blades. [6] Individuals can grow to a maximum of 36 m (118 ft). [7]
Bull kelp is a common name for the brown alga Nereocystis luetkeana which is a true kelp in the family Laminariaceae.. Species in the genus Durvillaea are also sometimes called "bull kelp", but this is just a shortening of the common name southern bull kelp.
Just one example is the giant bull kelp Nereocystis luetkeana, which have evolved to change blade shape in order to increase drag in water and interception of light when exposed to certain environments. Bull kelp are not unique in this adaptation; many kelp species have evolved a genetic plasticity for blade shapes for different water flow ...
Species such as Nereocystis luetkeana and Pelagophycus porra bear a single large pneumatocyst between the top of the stipe and the base of the blades. In contrast, the giant kelp Macrocystis pyrifera bears many blades along its stipe, with a pneumatocyst at the base of each blade where it attaches to the main stipe.
Gerasimenko, N.I.; Martyyas, E.A; Busarova, N.G (November 2012). "Composition of lipids and biological activity of lipids and photosynthetic pigments from algae of the families Laminariaceae and Alariaceae".
Some species, such as Nereocystis, are annuals, while others such as Eisenia are perennials, living for more than 20 years. [19] In perennial kelp forests, maximum growth rates occur during upwelling months (typically spring and summer) and die-backs correspond to reduced nutrient availability, shorter photoperiods, and increased storm ...
Pterygophora californica grows in underwater kelp forests with other brown algae including the annual bull kelp (Nereocystis luetkeana) and the perennial giant kelp (Macrocystis pyrifera). It is a dominant understory kelp species in these kelp forests, and creates a sub-surface canopy.
The sporophyte structure of laminaria can grow to 7 metres (23 ft), which is large in comparison to other algae, but still smaller than the giant kelps such as Macrocystis and Nereocystis, which can grow up to 40–50 metres (130–160 ft). On the other hand, the gametophyte structure is no more than a few millimeters in length.