Halimeda

Halimeda
Temporal range: Permian - recent[1]
Halimeda tuna
Halimeda tuna
Scientific classification Edit this classification
Clade: Viridiplantae
Division: Chlorophyta
Class: UTC clade
Order: Bryopsidales
Family: Halimedaceae
Genus: Halimeda
J.V.Lamouroux, 1812
Type species
Halimeda tuna
Species[2]

See text

Halimeda is a genus of green macroalgae. The algal body (thallus) is composed of calcified green segments. Calcium carbonate is deposited in its tissues, making it inedible to most herbivores. However one species, Halimeda tuna, was described as pleasant to eat with oil, vinegar, and salt.[3][4]

As in other members of the order Bryopsidales, individual organisms are made up of single multi-nucleate cells. Whole meadows may consist of a single individual alga connected by fine threads running through the substrate.[5]

Halimeda is responsible for distinctive circular deposits in various parts of the Great Barrier Reef on the north-east coast of Queensland, Australia.[6] Halimeda beds form in the western or lee side of outer shield reefs where flow of nutrient-rich water from the open sea allows them to flourish,[7] and are the most extensive, actively accumulating Halimeda beds in the world.

The genus is one of the best studied examples of cryptic species pairs due to morphological convergence within the marine macroalgae. [8] [9] [10]

Some species grow so vigorously in tropical lagoons that the sediment is composed solely of the remains of their tissues, forming a calcareous "Halimeda sand". In fact some tropical reef systems, such as atolls, consist largely of Halimeda sand accumulated over the aeons.[11] Overall, Halimeda represents the most common green algea large grains in the sediment of the lower latitudes.[12]

Taxonomy and nomenclature

The genus Halimeda J.V. Lamouroux belongs to the order Bryopsidales under the family Halimedaceae. It has five monophyletic sections - Halimeda J.V. Lamouroux, Micronesicae Hillis-Col, Opuntia J. Agardh ex De Toni, Pseudo-opuntia J. Agardh ex De Toni, and Rhipsalis J. Agardh ex De Toni[13] - which were based on the differences in the fusions of medullary siphons.[10] Halimeda tuna serves as the holotype for the genus.[14][15] There are 71 species and 67 infraspecific names listed on Algaebase as of 2015.[14]

Morphology

The thalli of Halimeda is distinctly segmented and calcified. Calcium carbonate is deposited as aragonite and calcification begins as early as 36 hours. Their segments are composed of 60-80% aragonite[8][16] and are separated by nodes which are non-calcified.[14] The thalli are composed of siphons which are ramified into medullary filaments surrounded by a cortex. The medullary filaments branch out trichotomously to form peripheral utricles which stick to each other to enclose the intersiphonal spaces of each segment. It is in these spaces that aragonite is precipitated.[17][4]

Halimeda has three types of holdfasts which serve as attachment points to the substrate. The "sprawler" type has a few loose filaments growing at the ends or in between the segments (Fig. 1). In the "rock-grower" type, the matted holdfast is composed of branched filaments which secure the thallus to a rock surface. The last type is the "sand-grower", where the filaments hold on to fine sand particles, forming a root-like structure.[4] Halimeda is coenocytic and siphonous, meaning its cells are not divided by cross walls, and is instead a continuous filament of cells. This differentiates the genus from Acetabularia, which is another genus of green seaweed that is calcified.[4]

Distribution

Halimeda is highly abundant in the tropics including the Thai-Malay Peninsula[18] and the Florida Keys.[19] Some species (e.g. H. copiosa, discoidea, gracilis, opuntia, simulans, and tuna) have a global distribution. Halimeda tuna is found solely in the Mediterranean.[14]

Figure 1. Erect and sprawling Halimeda plants

Ecology

Species of Halimeda with sand-grower type holdfasts grow on sandy or muddy substrates, and are thus common in lagoons and backreefs.[14] Those with the "sprawler" type are abundant in forereefs and on coral pinnacles.[14]

Being a calcareous alga, Halimeda has been found to have good potential as a carbon sink and can play an important role in regulating the ocean's carbon budget.[20] Some species such as H. opuntia have been found to produce up to 54.37 g CaCO3 m−1 yr−1.[21] The genus also contributes to reef building, as it is large producer of carbon sediments on reefs, generating a wide range of sediment sizes from coarse particles to silt and clay.[22][23]

Although it was largely assumed that its abundance on reefs is due to it being unpalatable to herbivores, more recent studies have found that Halimeda is in fact subject to grazing by some herbivores such as Scarus rivulatus, Hipposcarus longiceps, and Chlorurus microrhinos.[24] Hard coral cover can actually play a key role in maintaining Halimeda biomass on reefs, as one study found that thalli growing under the canopy of Acropora colonies were larger than those in open areas exposed to herbivory.[25]

Figure 2. Fossilised Halimeda

Life history

Halimeda reproduces both sexually and asexually. Sexual reproduction is rarely observed because it is completed in 36 hours.[15] The process begins with gametangia forming on the edges of the segments of the thalli. By the next day, the cells of the thallus will have been entirely converted to gametangia. These will mature overnight and release gametes in the morning of the next day, after which the thallus is left white and dies in a process known as holocarpy.[4][15][26] Some species of Halimeda have been found to reproduce synchronously in mass spawning events similar to that of corals, albeit occurring over several months, with small portions of the population spawning each day.[26][27] Therefore it is likely that the life span of the genus is limited to a few months to a year.[15]

Information on the phases of Halimeda's life cycle are limited. It is thought that there is a haploid gametophyte phase, which might be followed by a sporophyte phase, since it not yet known when meiosis occurs.[15]

Asexual reproduction occurs via vegetative "cloning" through fragmentation and dispersal.[4][28][15]

Chemical composition

The genus' photosynthetic pigments are those typical of class Chlorophyta (chlorophyll a and b) and also include siphonoxanthin and siphonein.[15]

Exploitation and cultivation

Currently, Halimeda does not appear to be cultivated for aquaculture purposes.

Utilization

Methanol and dimethyformamide extracts of Halimeda opuntia have been observed to have antibacterial properties against some species of microorganisms, including Saccharomyces cerevisiae, Escherichia coli, Bacillus subtilis, and most significantly, Staphylococcus aureus.[29] Halimeda opuntia ethanol extract exhibited activity against hepatitis C virus (HCV) due to polymerase inhibitory (HCV-796) binding sites based on molecular docking simulation.[30][31] Methanolic extracts of Halimeda macroloba have recently been found to exhibit cytotoxicity towards MCF-7 and HT 29 cells, which are derived from human breast cancer cell lines and colon cancer lines, respectively.[32] These results therefore suggest the genus' potential for cultivation as a food source.[32] An experiment on rats showed that free phenolic acids of Halimeda monile have antioxidant properties which could aid in protecting against liver problems.[33] Halimeda tuna appears to be used as fodder in the Philippines.[34]

Species

Figure 3. Halimeda fossils. The voids are where the Halimeda was, when it was covered with sand, then subsequently rotted, leaving a hole.
Figure 4. Halimeda copiosa at 10 meters depth in shallow cave

References

  1. ^ Hillis, L.W. (2001). "The calcareous reef alga Halimeda (Chlorophyta, Byropsidales): a cretaceous genus that diversified in the cenozoic". Palaeogeography, Palaeoclimatology, Palaeoecology. 166 (1–2): 89–100. Bibcode:2001PPP...166...89H. doi:10.1016/s0031-0182(00)00203-0. ISSN 0031-0182.
  2. ^ Guiry, M.D.; Guiry, G.M. (2007). "Genus: Halimeda taxonomy browser". AlgaeBase version 4.2 World-wide electronic publication, National University of Ireland, Galway. Retrieved 2007-09-24.
  3. ^ Bauhin, Jean; Cherler, Johann Heinrich (1651). "Liber XXXIX". Historia plantarum [...] Tomus III (in Latin). Ebroduni. p. 803. OCLC 495081149. Archived from the original (PDF) on 16 February 2018. Retrieved 15 February 2018. Nà Theophraftus (1. cap. hist. c. 12) scribit circa Opuntem herbulam effe quandam, quae ex foliis radicem mittat, ac cum suauitate mandi possit. Plinius verò ipsum sequutus (21.cap.17) circa Opuntem, inquit, Opuntia est herba, etiam homini-dulcis: mirúmque è folio ejus radicem sièri, ac sic eam nasci. Et certè credibile est hanc plantam recentem cum aceto, sale, & oleo, vel etiam sine sale, non minùs suauiter edi posse quàm Portulacae marinae & sìmilium folia.
  4. ^ a b c d e f Hills-Colinvaux, Llewellya (27 May 1980). "Ecology and Taxonomy of Halimeda: Primary Producer of Coral Reefs". In Baxter, J.H.S.; Russell, Frederick S.; Yonge, Maurice (eds.). Advances in Marine Biology (PDF). Vol. 17. Academic Press. pp. 17–18. ISBN 9780080579405. OCLC 476214112. Retrieved 15 February 2018.
  5. ^ The Cell Biology of the Bryopsidales
  6. ^ McNeil, Mardi A.; Webster, Jody M.; Beaman, Robin J.; Graham, Trevor L. (December 2016). "New constraints on the spatial distribution and morphology of the Halimeda bioherms of the Great Barrier Reef, Australia". Coral Reefs. 35 (4): 1343–1355. Bibcode:2016CorRe..35.1343M. doi:10.1007/s00338-016-1492-2. ISSN 0722-4028. S2CID 253816764.
  7. ^ McNeil, Mardi; Nothdurft, Luke; Erler, Dirk; Hua, Quan; Webster, Jody M. (February 2021). "Variations in Mid- to Late Holocene Nitrogen Supply to Northern Great Barrier Reef Halimeda Macroalgal Bioherms". Paleoceanography and Paleoclimatology. 36 (2). doi:10.1029/2020PA003871. ISSN 2572-4517. S2CID 234158224.
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  17. ^ Borowitzka, Michael A.; Larkum, Anthony W. D. (1977). "Calcification in the Green Alga Halimeda. I. An Ultrastructure Study of Thallus Development1". Journal of Phycology. 13 (1): 6–16. Bibcode:1977JPcgy..13....6B. doi:10.1111/j.1529-8817.1977.tb02879.x. ISSN 0022-3646. S2CID 86035589.
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  20. ^ Mayakun, Jaruwan; Prathep, Anchana (2018). "Calcium carbonate productivity by Halimeda macroloba in the tropical intertidal ecosystem: The significant contributor to global carbonate budgets". Phycological Research. 67 (2): 94–101. doi:10.1111/pre.12361. ISSN 1322-0829. S2CID 91879382.
  21. ^ Carneiro, Pedro Bastos De Macedo; Pereira, Jamile Ulisses; Matthews-Cascon, Helena (2016-08-30). "Standing stock variations, growth and CaCO3 production by the calcareous green alga Halimeda opuntia". Journal of the Marine Biological Association of the United Kingdom. 98 (2): 401–409. doi:10.1017/s0025315416001247. ISSN 0025-3154. S2CID 88674727.
  22. ^ Drew, Edward A. (1983). "Halimeda biomass, growth rates and sediment generation on reefs in the central great barrier reef province". Coral Reefs. 2 (2): 101–110. doi:10.1007/bf02395280. ISSN 0722-4028. S2CID 42335322.
  23. ^ Drew, E. A. and Abel, K. M. 1985. Biology, sedimentology and geography of the vast interreefal Halimeda meadows within the Great Barrier Reef province. In Harmelin-Vivien, M. and Salvat, B. (Eds). Proceedings of the 5th International Coral Reef Congress, Vol. 5. Antenne Museum-EPHE, Tahiti, pp. 15–20
  24. ^ Mantyka, CS; Bellwood, DR (2007-12-20). "Macroalgal grazing selectivity among herbivorous coral reef fishes". Marine Ecology Progress Series. 352: 177–185. Bibcode:2007MEPS..352..177M. doi:10.3354/meps07055. ISSN 0171-8630.
  25. ^ Castro-Sanguino, Carolina; Lovelock, Catherine; Mumby, Peter J. (2016-02-12). "The effect of structurally complex corals and herbivory on the dynamics of Halimeda". Coral Reefs. 35 (2): 597–609. Bibcode:2016CorRe..35..597C. doi:10.1007/s00338-016-1412-5. ISSN 0722-4028. S2CID 16561406.
  26. ^ a b Clifton, Kenneth E. (1997-02-21). "Mass Spawning by Green Algae on Coral Reefs". Science. 275 (5303): 1116–1118. doi:10.1126/science.275.5303.1116. ISSN 0036-8075. PMID 9027310. S2CID 38126293.
  27. ^ Clifton, Kenneth E.; Clifton, Lisa M. (1999). "The Phenology of Sexual Reproduction by Green Algae (Bryopsidales) on Caribbean Coral Reefs". Journal of Phycology. 35 (1): 24–34. Bibcode:1999JPcgy..35...24C. doi:10.1046/j.1529-8817.1999.3510024.x. ISSN 0022-3646. S2CID 83704320.
  28. ^ Walters, Linda J; Smith, Celia M; Coyer, James A; Hunter, Cynthia L; Beach, Kevin S; Vroom, Peter S (2002). "Asexual propagation in the coral reef macroalga Halimeda (Chlorophyta, Bryopsidales): production, dispersal and attachment of small fragments". Journal of Experimental Marine Biology and Ecology. 278 (1): 47–65. doi:10.1016/s0022-0981(02)00335-0. ISSN 0022-0981.
  29. ^ Selim, S. A. (2012). Antimicrobial, antiplasmid and cytotoxicity potentials of marine algae Halimeda opuntia and Sarconema filiforme collected from Red Sea Coast. World Academy of Science, Engineering and Technology, 61, 1154-1159.
  30. ^ Abdel-Rahman, Iman A. M.; Attia, Eman Zekry; Aly, Omar M.; Saber, Hani; Rushdi, Mohammed I.; Abdelmohsen, Usama Ramadan (2022-12-01). "Metabolite profiling of green algae Halimeda opuntia to target hepatitis C virus-796 polymerase inhibitors assisted by molecular docking". South African Journal of Botany. 151: 538–543. doi:10.1016/j.sajb.2022.10.038. ISSN 0254-6299. S2CID 253209343.
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  32. ^ a b Nazarudin, Muhammad Farhan; Isha, Azizul; Mastuki, Siti Nurulhuda; Ain, Nooraini Mohd.; Mohd Ikhsan, Natrah Fatin; Abidin, Atifa Zainal; Aliyu-Paiko, Mohammed (2020-11-22). "Chemical Composition and Evaluation of the α-Glucosidase Inhibitory and Cytotoxic Properties of Marine Algae Ulva intestinalis, Halimeda macroloba, and Sargassum ilicifolium". Evidence-Based Complementary and Alternative Medicine. 2020: 1–13. doi:10.1155/2020/2753945. ISSN 1741-4288. PMC 7704141. PMID 33299448.
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Asuransi Unit Link

artikel ini tidak memiliki pranala ke artikel lain. Tidak ada alasan yang diberikan. Bantu kami untuk mengembangkannya dengan memberikan pranala ke artikel lain secukupnya. (Pelajari cara dan kapan saatnya untuk menghapus pesan templat ini) Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada Februari 2023. Artikel in...

 

 

Elite theory

Theory of the state In philosophy, political science and sociology, elite theory is a theory of the state that seeks to describe and explain power relationships in society. The theory posits that a small minority, consisting of members of the economic elite and policymaking networks, holds the most power—and that this power is independent of democratic elections.[1] Through positions in corporations and influence over policymaking networks, through the financial support of foundatio...