Bangia

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Bangia
"Bangia fuscopurpurea"
Bangia fuscopurpurea
Scientific classification Edit this classification
(unranked): Archaeplastida
Division: Rhodophyta
Class: Bangiophyceae
Order: Bangiales
Family: Bangiaceae
Genus: Bangia
Lyngbye, 1819[1]
Type species
Bangia atropurpurea[3]
Species

see text[2]

Synonyms[4]

Bangia is an extant genus of division

r-selected species. The plants are attached by down-growing rhizoids, usually in dense purple-black to rust-colored clumps. The chloroplasts of Bangia, like others in the division Rhodophyta, contain chlorophyll a and sometimes chlorophyll d, as well as accessory pigments such as phycobilin pigments and xanthophylls. Depending on the relative proportions of these pigments and the light conditions, the overall color of the plant can range from green to red to purple to grey; however, the red pigment, phycoerythrin
, is usually dominant.

Species

Description

Bangia is a red alga that arises from a discoid holdfast and short stipe consisting of the extensions of rhizoidal cells. Bangia has unbranched, erect thalli forming initially uniseriate filaments becoming multiseriate at maturity. The plant is composed of filiform, unbranched cylinders of cells embedded in a firm gelatinous matrix. The cell contains a stellate chloroplast with prominent pyrenoid, as well as single thylakoids (characteristic of division Rhodophyta). The growth of Bangia is diffuse and intercalary, and each cell is quadrate to rectangular in shape. Primary pitt connections are absent in all but the conchocelis stage.

Distribution

Bangia grows in freshwater or in marine habitats, usually forming dense clumps or mats, and occur throughout the intertidal area and subtidally to the maximum depth at which benthic algae occur. The plants are usually attached to a solid substratum (rock or shell), but can also occur as epiphytes attached to other algae.

Ecology

Marine populations of Bangia in the Atlantic Ocean are common food for the periwinkle

Littorina littorea
.

Reproduction

Species of Bangia undergo a heteromorphic alternation of generation life cycle in which the haploid generation is dominant. Reproduction can be either sexual or asexual; sexual plants occur mainly during the cold season of the year, while at other times the thalli often bear monosporangia only. Bangia, like all Rhodophytes, lack motile sperm and so depend upon water currents to transport their gametes to the trichogyne (receptive area of the female gamete or carpogonium).

All sexual reproduction in rhodophytes is oogamous. Carposporangia are formed through direct division of the zygote. Carpospores germinate to form the diploid filamentous conchocelis phase, which produces conchosporangial branches bearing conchosporangia, each containing a single conchospore. These conchospores then germinate to form gametophytes. During the "conchocelis stage", the plants can also self-replicate using monospores. The monospores develop directly into new plants and may germinate within the sporangia.

Scientific interest

Silicified peritidal carbonate rocks have been found off Somerset Island, arctic Canada, which contain fossils of well-preserved bangiophyte red algae (Bangiomorpha). Because these fossils have multiseriate filaments derived by longitudinal divisions from uniseriate filaments, taxonomists believe that these fossils are related to Bangia. This resolution distinguished these fossils from other pre-Ediacaran eukaryotes and contributes to evidence that multicellular algae diversified before the Ediacaran radiation of large animals.

Related genera

Erythrocladia
.

Etymology

The genus was named after Niels Hofman Bang (1803–1886), the Danish patron of Hans Christian Lyngbye, who described the genus.[6]

References

  1. ^ Lyngbye, H.C. (1819). Tentamen hydrophytologiae danicae continens omnia hydrophyta cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, systematice disposita, descripta et iconibus illustrata, adjectis simul speciebus norvegicis. pp. [i]-xxxii, [1]-248, 70 pls. Hafniae [Copenhagen]: typis Schultzianis, in commissis Librariae Gyldendaliae. https://img.algaebase.org/pdf/25E4D8D711cd6252F2pT5D060A8A/13523.pdf
  2. ^ a b Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org/search/genus/detail/?genus_id=33891 ; searched on 13 June 2019.
  3. ^ Pfeiffer, L. (1871-1873). Nomenclator botanicus. Nominum ad finem anni 1858 publici juris factorum, classes, ordines, tribus, familias, divisiones, genera, subgenera vel sectiones designantium enumeratio alphabetica. Adjectis auctoribus, temporibus, locis systematicis apud varios, notis literariis atque etymologicis et synonymis. Vol. 1 pp. [i-vi], [1]-808. Cassellis [Cassel]: Sumptibus Theodori Fischeri [Theodor Fischer].
  4. ^ Guiry, M.D. & Guiry, G.M. (2019). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Bangia Lyngbye, 1819. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=143807 on 2019-06-13
  5. ^ Boelens, G., Boelens, R., Minchin, B. and Minchin, D. 2014 Bangia atropurpurea (Maertens ex Roth) C. Agardh (Rhodophyta) in the Grand Canal, Ireland. Ir. Nat. J. 33: 128 - 129
  6. S2CID 246307410
    . Retrieved January 27, 2022.
  • Brodie, Juliet A., and Irvine, Linda M. “Volume I Rhodophyta Part 3B Bangiophycidae.” Seaweeds of the British Isles. The Natural History Museum. St. Edmundsbury Press Ltd., 2003. pp 91–92
  • Butterfiled, Nicholas J; Knoll, Andrew H; Sweet, Keene. “A Bangiophyte Red Alga from the Proterozoic of Arctic Canada.” Science, New Series, Vol. 250, No. 4977, 1990. pp 104–107
  • Fritsch, F.E. “Structure and Reproduction of the Algae Volume II.” Cambridge University Press 1945. pp 397–398, 415, 423-424, 431, 433-435
  • Garbary, David, J; Hansen, Gayle I; Scagel, Robert F. “The Marine Algae of British Columbia and Northern Washington: Division Rhodophyta (Red Algae), Class Bangiophyceae.” Dept. of Botany, University of British Columbia, Vancouver, Canada. 1980. pp 139–142 and 164-165

Further reading
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