Blue Ecosystems יעוץ סביבתי, בהנהלת ד"ר רחלי עינב - Dasya

 

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דף הבית >> Seaweeds of Eastern Mediterranean coast >> Rhodophyta >> Dasya
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Rhodophyta | Chlorophyta | Rhodophyta
Dasya C. Agardh, 1824





Taxonomy
Rhodophyta, Order: Ceramiales; Family: Dasyaceae.
Etymology
Dasya is ‘hairy’, and refers to the abundance of soft hair on the thallus.
Description
The Dasya is an erect alga, soft and very delicate. It resembles a collection of small pompons arranged in clumps. The branches are cylindrical and interleaved. They are bare at the base, and have a lump at the edge that looks like a soft ball of filaments; in fact, each contains thin crimson branches that are dichotomously branched. Microscopic examination reveals that the thallus usually comprises four to five rows of cells, each leading to a separate branch.
Size
The branches measure up to 1 mm each. Each pompon is several millimeters in diameter. The entire alga may reach 12 cm in diameter, and sometimes even more.
Colour
The alga is red, in shades ranging from burgundy to reddish- brown. It may sometimes be slightly faded.
Special features
The algal softness is its major characteristic, along with the instability of the thallus: when extracted from the water, it loses its erect form.
Habitat
The alga is found in the intertidal zone upon the rims of abrasion platforms and sometimes in potholes.
Biology and reproduction
During the reproduction season, transparent cystocarps that carry long carpospores in dense clumps may be seen on the Dasya. The reproductive tetraspores are arranged along special branches that are also arranged in clumps.
The structural complexity and its beauty have attracted researchers to this alga. Amongst these, research into the spatial development has resulted in a model that exhibits a three-dimensional loop shape of development.
Seasonality and distribution
The alga may be found along the coastline year round. The genus is prevalent in temperate seas around the world. Some species, such as Dasya hutchinsiae, are common around the world. Others, like Dasya baillouviana, are common in the Mediterranean, and there are other species that are distributed only locally.
Additional species
The definition of species is in accordance with the branch arrangement, pigmentation and other characteristics. As with many other genus, additional research is needed to assess the species in this region. Some species that have been reported in this area are:
Dasya arbuscula (Dillwyn) C. Agardh Dasya baillouviana (S. G. Gmelin) Montagne
Dasya corymbifera J. Agardh
Dasya elegans (Martens) C. Agardh Dasya flocculosa Zanardini
Dasya hutchinsiae Harvey
Dasya ocellata (Grateloup) Harvey
Dasya punicea Meneghini and Zanardini
Dasya rigidula (K.tzing) Ardissone.
Dasya ocellata
Dasya elegans -general view of the thallus.
In some species of Dasya, laboratory experiments show the presence of antibiotic material, a fact that indicates economic potential for the Dasya

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