Encyclopedia
What are algae? Algae are organisms that perform photosynthesis; that is, they absorb carbon dioxide and release oxygen (therefore they have chlorophyll, a group of green pigments used by photosynthetic organisms that convert sunlight into energy via photosynthesis) and live in water or in humid places. Algae have great variability and are divided into microalgae, small in size and only visible through a microscope, and macroalgae, which are larger in size, up to more than 50 m (the maximum recorded was 65 m), and have a greater diversity in the oceans. Thus, the term “algae” is commonly used to refer to “marine macroalgae or seaweeds”. It is estimated that 1800 different brown macroalgae, 6200 red macroalgae, and 1800 green macroalgae are found in the marine environment. Although the red algae are more diverse, the brown ones are the largest.
- macroalgae
- classification
- pigments
- morphological characteristics
- reproduction
Algae are single or multicellular organisms that live in water or in humid places. These organisms have chlorophyll (an organic pigment capable of absorbing and channeling the energy of sunlight), which is why they are able to perform photosynthesis, that is, the transformation of luminous energy into chemical energy, capturing carbon dioxide (CO2) to form complex organic compounds (along with water and mineral salts), and releasing gaseous oxygen (O2), during the process of organic synthesis. Algae are considered the true “lungs” of planet Earth, stealing this epithet from large forest patches, such as the Amazon rainforest. Algae are distinguished from seagrass (angiosperms) because, unlike the latter, they do not have a vascular system (xylem and phloem). Algae on the seafloor have a holdfast and transport nutrients through the body by diffusion, while seagrasses are flowering vascular plants with roots and an internal transport system[1][2].
References
- Pereira, L. Guia Ilustrado das Macroalgas—Conhecer e Reconhecer Algumas Espécies da Flora Portuguesa, 1st ed.; Coimbra University Press: Coimbra, Portugal, 2009; p. 90, ISBN 978-989-26-0002-4, doi:10.14195/978-989-26-0397-1.
- Gaspar, R.; Fonseca, R.; Pereira, L. Illustrated Guide to the Macroalgae of Buarcos Bay, Figueira da Foz, Portugal, 1st ed.; MARE UC, DCV, FCT: Coimbra, Portugal, 2020; p. 128, doi:10.13140/RG.2.2.31009.56165.
- Pereira, L.; Correia, F. Algas Marinhas da Costa Portuguesa—Ecologia, Biodiversidade e Utilizações, 1st ed.; Nota de Rodapé Edi-tores: Paris, France, 2015; p. 341, ISBN 978-989-20-5754-5.
- Fredericq, S.; Schmidt, W.E. Red Algae. eLS 2016, 1–7, doi:10.1002/9780470015902.a0000335.pub2.
- Adl, S.M.; Simpson, A.G.; Farmer, M.A.; Andersen, R.A.; Anderson, O.R.; Barta, J.R.; Bowser, S.S.; Brugerolle, G.; Fensome, R.A.; Fredericq, S.; et al. The new higher level classification of eukaryotes with emphasis on the taxonomy of protists. J. Eu-karyot. Microbiol. 2005, 52, 399–451, doi:10.1111/j.1550-7408.2005.00053.x.
- Woelkerling, W.J. 1990. An introduction. In Biology of the Red Algae, 1st ed.; Cole, K.M., Sheath, R.G., Eds.; Cambridge Uni-versity Press: Cambridge, UK, 2011; pp. 1–6.
- Grossman, A.R.; Schaefer, M.R.; Chiang, G.C.; Collier, J.L. The phycobilisome, a light-harvesting complex responsive to envi-ronmental-conditions. Microbiol. Rev. 1993, 57, 725–749.
- Pereira, L. Cytological and cytochemical aspects in selected carrageenophyte (Gigartinales, Rhodophyta). In Advances in Algal Cell Biology, 1st ed.; Heimann, K., Katsaros, C., Eds.; De Gruyter: Berlin, Germany, 2012; pp. 81–104, ISBN 978-3-11-022960-8, , doi:10.1515/9783110229615.81.
- Maggs, C.A.; Cheney, D.P. Competition studies of marine macroalgae in laboratory culture. J. Phycol. 1990, 26, 18–24, doi:10.1111/j.0022-3646.1990.00018.x.
- Brown, M.T.; Neish, A.A.; Harwood, D. Comparison of three techniques for identifying isomorphic phases of Chondrus cris-pus (Gigartinaceae). J. Appl. Phycol. 2004, 16, 447–450, doi:10.1007/s10811-004-5507-y.
- Thornber, C.S. Functional properties of the isomorphic biphasic algal life cycle. Integr. Comp. Biol. 2006, 46, 605–614, doi:10.1093/icb/icl018.
- Pereira, L. Therapeutic and Nutritional Uses of Algae; CRC Press/Taylor & Francis Group: Boca Raton, FL, USA, 2018; p. 560, ISBN 9781498755382, doi:10.1201/9781315152844.
- Farrar, W.V.T. A glimpse of Aztec food technology. Nature 1966, 211, 341–342, doi:10.1038/211341a0.
- Pereira, L. Edible Seaweeds of the World; CRC Press/Taylor & Francis Group: Boca Raton, FL, USA, 2016; p. 448, ISBN 9781498730471, doi:10.1201/b19970.
- Pereira, L.; Bahcevandziev, K.; Joshi, N.H. (Eds.) Seaweeds as Plant Fertilizer, Agricultural Biostimulants and Animal Fodder; CRC Press; Taylor & Francis Group: Boca Raton, FL, USA 2019; p. 232, ISBN: 978-1-13-859706-8 doi:10.1201/9780429487156.
- Cotas, J.; Leandro, A.; Pacheco, D.; Gonçalves, A.M.M.; Pereira, L. A comprehensive review of the nutraceutical and thera-peutic applications of Red Seaweeds (Rhodophyta). Life 2020, 10, 19, doi:10.3390/life10030019.
- Pacheco, D.; García-Poza, S.; Cotas, J.; Gonçalves, A.M.M.; Pereira, L. Fucoidan—A valuable source from the ocean to pharmaceutical. Front. Drug Chem. Clin. Res. 2020, 3, 1–4, doi:10.15761/FDCCR.1000141.
- Food and Agriculture Organization. The State of World Fisheries and Aquaculture (2020); Sustainability in action; FAO: Rome, Italy, 2020; p. 208, doi:10.4060/ca9229en.
- Chopin, T.; Tacon, A.G. Importance of Seaweeds and Extractive Species in Global Aquaculture Production. Rev. Fish. Sci. Aquac. 2020, doi:10.1080/23308249.2020.1810626.
- García-Poza, S.; Leandro, A.; Cotas, C.; Cotas, J.; Marques, J.C.; Pereira, L.; Gonçalves, A.M.M. The evolution road of sea-weed aquaculture: Cultivation technologies and the industry 4.0. Int. J. Environ. Res. Public Health 2020, 17, 6528, doi:10.3390/ijerph17186528
- Pereira, L. Macroalgae: Diversity and Conservation. In Life below Water, 1st ed.; Leal Filho, W., Azul, A.M., Brandli, L., Lange Salvia, A., Wall, T., Eds.; Encyclopedia of the UN Sustainable Development Goals; Springer: Cham, Switzerland, 2020; pp. 1–13, doi:10.1007/978-3-319-71064-8_33-1.
