Fucales


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Fucales

[fyü′kā·lēz]
(botany)
An order of brown algae composing the class Cyclosporeae.

Fucales

 

an order of brown algae of the class Cyclosporeae. The thalli are bushy and measure 0.1 to 2 m long (less commonly, to 10 m); they have cylindrical or flat branches marked by apical growth. Fucales differ from other algae in development cycle. The thalli are diploid sporophytes, in which develop, from special solitary cells (spores), diploid gametophytes in the form of a layer of special cavities, or conceptacles. There is meiosis with gameto-genesis. The oogoniums have one to eight egg cells. In some species that have a single egg cell, fertilization and the early stages of development occur on the maternal plant. Reproduction by fragments of thalli results in plants that are unable to form organs of attachment and reproduction.

There are about 300 species, making up 40 genera. The three principal families are Fucaceae, Cystoseiraceae, and Sargassa-ceae. The algae grow in all seas except in the Aral and the Caspian. The USSR has 21 species belonging to seven genera. The algae are used in the production of alginates, feed meal, and fertilizers; some species are used as food.

IU. E. PETROV

References in periodicals archive ?
In our case, the origin of fragments with odd DP that were detected at m/z 637.01, 739.00, 929.16, 1031.13, and 1133.07 (Figure 1), as it was observed in autohydrolysis mixture of fucoidan from Silvetia babingtonii (Fucales) is unclear.
Balakrishnan et Kinkar Orden Fucales Sargassaceae 134.
Distinctive morphological features of Sargassum desfontainesii (Fucales, Phaeophyceae).
Exogenous inorganic carbon source for photosynthesis in seawater by members of the Fucales and Laminariales (Phaeophyta): ecological and taxonomic implications.
Biologia populacional das especies de Ampithoidae (Crustacea, Amphipoda) associadas a Sargassum filipendula (Phaeophyta, Fucales) na Praia da Fortaleza, Ubatuba, Sao Paulo, Brasil.
Seasonal variation in the pigment content and photosynthesis of different thallus regions of Ascophyllum nodosum (Fucales, Phaeophyta) in relation to position in the canopy.
Other ampithoids use hosts from the seaweed orders Fucales and Laminariales, which are poor in nonpolar chemical defensive metabolites (Macaya et al., 2005; Macaya and Thiel, 2008; Poore et al., 2008).
Fensholt (Phaeophyta, Fucales) in the Mexican Pacific.
Las algas marinas del genero Sargassum pertenecientes al Orden de las Fucales, por su composicion quimica, son consideradas por el National Research Council como alimentos energeticos ya que contienen menos de un 20% de proteina, menos del 18% de fibra cruda y menos de un 35% de paredes celulares (o de fibra neutro detergente) (N.R.C.
Most genera in this order of phaeophytes such as Nereocystis, Macrocystis, and Laminaria, and many in the order Fucales (Sargassum, Cystoseira) form dense "forests" that greatly reduce the light reaching the substrate, decisively influencing the recruitment, growth, reproduction, and survival of smaller algae.