Species of Trentepohlia are commonly found upon the bark of trees. The best characterized fossils are the coralline red Algae represented in fossil beds since the Precambrian time (from about 3,800 million years ago until 544 million years ago).ReproductionReproduction in Algae occurs in both asexual and sexual forms. They are found upon the trunks of trees, walls, fencing wires, rocks, and animals and so many other aerial substrata. 2014;Adam et al. 0000003074 00000 n Sewage can be treated with Algae, reducing the need for greater amounts of toxic chemicals than are already used. The process of replication and division of the nucleus that results in the production of genetically identical daughter cells is known as Mitosis. Origin and Evolution of Algae Photosynthetic Species contain Chlorophyll A; Chlorophyll D is however present in some Species. (i) Epiphyllophytes: Such algae are epiphytic upon leaves of trees. Some have flagella, which lack tubular hairs (mastigonemes). Most of these alga make up the phytoplankton or periphyton and are considered a … There are at least 1,500 Species. Users may consult this resource to check taxonomies or nomenclature, obtain information pertaining to geographic distributions, and view or download images. Forgot password?Submit your email address and we'll send you a link to reset your password. trailer Algae are also known as 'Sea-Weeds', 'Pond-Scum' and 'Grasses of Water'. 0000071041 00000 n The seaweeds are then spread over the soil. 0000013785 00000 n 0000003888 00000 n Epizoic Algae - These grow on Animals, such as Turtles and Sloths. Division Rhodophyta (red algae or red seaweeds)Features: Types of Algae based on CellsMicroalgae - The unicellular forms are known as Microalgae. Predators - Algae is eaten by Algae Eating Fish, including Black Sailfin Mollies, Otocinclus, Plecostomus, Siamese Algae Eater, Crossocheilus siamensis etc. )z�e�� �����t���2�N���w��E��x2f.�弬�*W�n���y#����d �}[�T����? Class Pleurastrophyceae - These are both Freshwater and Marine and include Marine Flagellate, Tetraselmis. 0000009348 00000 n They have Mitochondria with tubular cristae and flagella without tubular hairs. They are at the bottom of the food chain with many organisms depending upon them. They are mostly Pennate Diatoms, usually attached or gliding over solid substrates, with valves bilaterally symmetrical; primarily in freshwater, marine, and soil environments. ��ϹX�>���n��V:x�F�v��d��,��������˻D���uCJGM ����Z���rEC}��p>��NQ�T�BJ� �����E�v��*� �!N�c'�O�+�Sl�(�B�Օ�� '�����!ϔ4����=�0.I��w��WM�DžE�i��w��)Q��3�O� �_� 3. There are many habitats within a river or stream in which animals and plants occur for all or part of their life cycles. H��T�r�0��W� @���)2nܰ�(HdL� These organisms can thrive in freshwater lakes or in saltwater oceans. Diatoms are also examples of Algae. Many have cellulosic plates that form a armour like structure around cell. Geographical Range and Habitat They are distributed worldwide in the sea, in freshwater and in waste water. Sign Up to get started. 0000008103 00000 n They have phycobiliproteins (phycocyanin and phycoerythrin) in discrete structures (phycobilisomes). What Is Algae? They are predominantly freshwater. There are about 30,000 Species of Algae. 0000002476 00000 n They are characterised with having Mitochondria with tubular cristae and bi flagellate cells and zoo-spores with tubular hairs on one flagellum. Coastal farmers collect seaweeds by cutting them from seaweed beds growing in the ocean or by gathering them from masses washed up on shores after storms. Common Name: Blue-green algae/micro-algae. Their mitochondria with flattened cristae. %q�L?jh�C��Ҙ���nD�JA�g�6�-�ڄ:��;m[ Occurrence and Distribution of Algae Algae can be aquatic or subaerial, when they are exposed to the atmosphere rather than being submerged in water. These eukaryotic cells do not have flagella and centrioles, unlike other types of algae. The highest density value of seaweed in Tantui was 389.0 g/m² of Chlorophyceae of Halimeda genus. endstream endobj 132 0 obj<>stream The leaves are narrow (1-4 mm) and can be up to 2 m in length depending on the species. These are used as thickening agents in food, in surgical dressings and in microbial media. Watch Queue Queue. Their starch is stored outside chloroplast. 0000010444 00000 n ALGAE - OCCURRENCE AND DISTRIBUTION Benthos.—Most algae grow permanently submerged, and are either attached (benthos) or free-floating (plankton). Despite its importance our understanding of the precise habitat parameters and mechanisms that make a habitat important as a nursery area is still limited for many species. H��U˒�0��+�(U-, 9&���m+�eC Fossils that resemble modern Tetraspores are known from the Amelia Dolomites of Australia (formed some 1.5 billion years ago). Algae produce more oxygen than all the Plants in the world, put together. Photosynthetic Forms contain Chlorophyll A, some may have 1 or more Chlorophyllide C Types, and Peridinin or Fucoxanthin. There are fewer than 50 Species including Heterosigma, Vacuolaria and Olisthodiscus.Class Synurophyceae - Their cells are covered with elaborately structured Silica Scales. These are newly described Class and more are still to be discovered.Class Phaeophyceae (brown algae or brown seaweeds) - These Range from microscopic forms to large kelps more than 20 metres long. The results found 21 species of macro- algae consisting of 10 species of Rhodhophyceae, 6 species of Chlorophyceae, and 5 species of Phaeophyceae. ��nn�����i��_K���a��0iH͚��aP��E���������G��CL�vP-t��:��\�KW�l�k�`��O�kY��G|�֮떮b׻@�!� ��W��u�Zv��2� �e0?Ob�0�����47㰜�a�_�5�Y�%aX��B��$&��/��Qdž�=��&ܻ`l�ѝ���Ub��n y�{�*��_����yĻ���á �[i�ͯ��������K�mXD-�n9��Xɰ��E�,��zE�{2��� Most of these type of Algae have Chlorophyll A, with exception of one or two containing Chlorophyllide C. These have Carotenoids (yellow to red pigments) present. Their cells are covered with periplast, often elaborately decorated sheet or scale covering. Habitat. 0000001962 00000 n habitat quality can greatly aid habitat selection (Monkko-nen et al. Hamed Botany Department, Faculty of Science, Ain Shams University, Cairo, Egypt. Some of these are bioluminescent, some containing symbionts; resting (interphase) nucleus contains permanently condensed chromosomes. These may be included in the Chrysophyceae or in the Protozoan group Zoomastigophora.Class Chrysophyceae (golden algae) - These are mostly Unicellular or Colonial Flagellates. Most algae are tightly attached in this habitat. In many Species, when temperature, salinity, inorganic nutrients (e.g., phosphorus, nitrogen, and magnesium), or day length become unfavourable, sexual reproduction is induced.The Algae have evolved many variations in sexual reproduction such as different types of gametes, different means of gamete transfer, and different locations of fertilization. 0000112512 00000 n cs.umd.edu. There are two methods of sexual reproduction: A sexually reproducing organism typically has two phases in its life cycle. Unicellular green algae of the genus Dunaliella TEOD. Microalgae comprise a vast group of photosynthetic, heterotrophic organisms which have an extraordinary potential for cultivation as energy crops. They were previously placed in Chrysophyceae; silica-scaled; unicellular or colonial flagellates sometimes alternating with Capsoid Benthic Stage. Distribution of Bryophytes 3. ... Habitats of Freshwater Algae, Freshwater Algae of North America, 10.1016/B978-0-12-385876-4.00002-5, (13-74), (2015). Extracts from the cell walls of (typically brown & red) Algae provide the Polysaccharides Agar and Carageenan. New to Target Study? H��T�N�@}�Ẉ]����W�*��4��F} \ㄠ�������og׉ T��X^o�9gf�ك��@��׶Z%�3��6A�*��3.�q͜�M�̒~�E�(f ����̄f>�ȹ��.�0�����|�bV~.n�Q��'H$w�(��3K��3a G�̩ ���?��´q̹}X5KNvDeKԻ=Q�I�w`�ң���LĻ�s4��I�H���ޔK�>՛�E��QI�I�D� Corticolous Algae - These grow on the bark of trees. There are about 600 Species which include Bumilleriopsis, Tribonema and Vaucheria. 0000027487 00000 n Aquatic aquatic algae are found almost anywhere from freshwater spring to salt lakes, with tolerance for a broad range of pH, temperature, turbidity, and O 2 and CO 2 concentrations. Although the exact origin of the word algae is unknown, the singular form, alga, is a Latin word that refers to seaweed.Some etymologists have theorized that the term algae may have its roots in the Latin language from the word algēre, which refers to the cold. Crossref. Red algal fossils are the oldest known algal fossils. These floating “islands” of brown algae also host a unique assemblage of invertebrates, many of which are camouflaged to look like or blend into the Sargassum. Surfgrasses are flowering plants, grassy green to bright green in color. These alga are usually highly mobile. General characteristics. 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