#2747 - Sargassum sinclairii
Described by Sir Joseph Dalton Hooker in 1845, in his Algae Novae Zelandiae; being a catalogue of all of the species of algae yet recorded as inhabiting the shores of New Zealand, with characters and brief descriptions of the new species discovered during the voyage of H.M. discovery ships "Erebus" and "Terror" and of others communicated to Sir W. Hooker by Dr. Sinclair, the Rev. Colenso, and M. Raoul. London Journal of Botany 4: 521-551. He named this one after Dr Andrew Sinclair (1794–1861), a surgeon, collector, and second Colonial Secretary to New Zealand. 15 other plants are named after him as well.
The most common Sargassum species in Aotearoa, and apparently more rarely recorded along the eastern coast of Australia.
Most brown macroalgae prefer cooler waters, but many Sargassum species live in temperate and tropical oceans. A few species are pelagic - floating in the open ocean for their entire lives. The Sargasso Sea in the Atlantic is named after the large quantities of the seaweed drifting on the surface. A good number of species including the Gulfweed Crab Planes minutus and the Sargassum Anglerfish Histrio histrio have evolved to live in the floating forests.
In the last decade or so, populations of the floating seaweed have exploded, inundating the beachs of several Caribbean islands up to a meter deep. This seems to be related to fertilizer runoff from the Amazon basin.
Dunedin, Aotearoa New Zealand