Whittaker, J.E. & Farnham, W.F. 1983 The Fleet
(Dorset), a preliminary biological study. In: The
structure and function of brackish water and inshore
communities. EBSA Heriot-Watt Symposium, Edinburgh.
algae have been studies by Burrows and Farnham (1980)
and Burrows (1981); some 150 species have been identified.
Their occurrence and distribution are mainly determined
by salinity and available substrates. Some of these
species have been rarely recorded; the stonewort
Lamprothamnium papulosum is known from only
three other brackish sites in the British Isles
[now known to occur at more sites than this] but
had been found in the Fleet since 1869. Alien seaweeds
have also been discovered, namely Grateloupia
filicina var. luxurians, Solieria
chordalis and recently, Sargassum muticum.
The latter two species occur within Weymouth Bay
and have migrated into the Fleet on mobile substrates
such as stones and shells. In the deeper channels
(2-5m) of East Fleet many interesting sublittoral
algae occur, including Acrothrix gracilis,
Cordylecladia erecta, Gloisiphonia capillaris
and Gracilaria (all three British species).
Other algae grow as epiphytes on Zostera
leaves, e.g. Cladosiphon zosterae or entangled
around the bases e.g. Entermorpha flexuosa
and Cladophora spp. Ulva usually forms
massive growths in West Fleet, especially during
the summer, perhaps in response to eutrophication.