New!! Seeds begin to develop in about 2–4 weeks if fertilization occurred. Thalassia testudinum K.D.Koenig, 1805 Turtle Grass. Sorry about that ;-) Il n'y a qu'une seule fleur pistilée par inflorescence femelle. 20 2018. Thalassia. Thalassia testudinum is the dominant seagrass in southeast Florida as well as the Florida gulf coast. Meso-fauna foraging on seagrass pollen may serve in zoophilous pollination. [13][11][9][5] If an event occurs producing significant water turbulence, an immature fruit may break off from the peduncle. Species. Given their widespread occurrence on the shelf, it is likely that the ecological relationships between seagrasses and coral reef complexes warrant further investigation. A flat bladed, dark green sea grass featuring an extensive root system that securely anchors and protects the plants from tidal surge, storms and ocean currents. They are finely veined and rounded at the tips. The flowers grow on short stalks in the axils of the leaves and are greenish-white, sometimes tinged pink, and are followed by seed pods. See more » Bacteria. Anzeige. The areas affected have since been reseeded and planted with rhizomes and have recovered. van Tussenbroek BI, Monroy-Velazquez LV, Solis-Weiss V. 2012. Elle exige une salinité élevée et ne pousse pas dans les zones trop souvent battues par les vagues, bien qu'elle supporte une exondation et une exposition occasionnelle à l'air durant les marées basses de fort coefficient. Accessed: 2018 Jul. REPRODUCTION SEASON. They move from flower to flower, feeding and spreading the pollen from male to female. Phylum Magnoliophyta. This increase in rhizome length results in asexual ramets, or clonal colonies which are genetic replicates of the parent plant. Elle possède un rhizome horizontal profondément enfoui sous les sédiments marins (jusqu'à 25 cm), de 3 à 6 mm de diamètre[1],[2]. Kingdom Plantae Phylum Angiospermophyta Genus Thalassia Species Thalassia testudinum Turtle grass has a horizontal rhizome, buried as much as 25 cm deep in the sediment. Thalassia testudinum Banks ex König Description: This sea grass has a horizontal rhizome, buried as much as 25 cm deep in the sediment. Published on the internet. If the new location has favorable environmental conditions, the seedling will begin to grow. Likely Reef Tank Suitable. The rhizome is buried in the substrate 5 to 10 cm (2 to 4 in) deep, exceptionally down to 25 centimetres (9.8 in). This grass is subject to periodic dieback episodes in the Florida Bay area. The leaves arise in clusters from short stalks; they are flat, 4-18 mm wide and may be 30 cm long. The leaves arise in clusters. Lorsque les eaux sont claires, elle peut se développer jusqu'à 20 m de profondeur[1], même si on la trouve plus fréquemment à moins de 10 m de profondeur[2]. Cette espèce n'est pas une algue mais une plante à fleurs dont tous les organes sont normalement entièrement immergés. Thalassia testudinum is found in coral reefs, sand, mud, rocks, and rubble bottoms at depths between 0 to 10 meters. It gives rise to erect, green leaves. United States, FL, Miami. 1969. Zieman JC. It gives rise to erect, green leaves. 20. Thalassia. Phenology and reproductive physiology of, Orpurt PA and Boral, LL. Thalassia testudinum également appelée « herbe à tortue », est une plante qui pousse sur les fonds marins tropicaux et forme des herbiers qui constituent des zones de frai pour les poissons. Overall Geographic Range Americas, Caribbean. Powered by Create your own unique website with customizable templates. Il s'agit de l'espèce type du genre Thalassia[7]. Comme les autres espèces du genre Thalassia, Thalassia testudinum est monoïque stricte, c'est-à-dire que les organes mâles et femelles sont situés dans des fleurs différentes d'un même individu. En effet, plusieurs espèces marines herbivores se nourrissent de ses feuilles, notamment la tortue verte (Chelonia mydas)[1]. Banks & Sol. Species testudinum. Global Biodiversity Information Facility. Erosion des blocs calcaires (madrépores). Ces fleurs sont bien visibles, blanc tirant sur le vert ou le rose jusqu'à rose pâle et sont dépourvues de pétales. There are thirteen families in the order and more than 356 species. Halodule wrightii is the most common. Thalassia testudinum a été décrite scientifiquement pour la première fois en 1805 par le naturaliste britannique Joseph Banks dans Annals of Botany, Volume 2, édité par le naturaliste allemand Karl Dietrich Eberhard König[6]. Ces formations calcaires sont formées de madrépores. There are two methods of pollination: hydrophily and biotic pollination. They are finely veined and rounded at the tips. The plant's preferred salinity range is 25 to 38.5 parts per thousand with a temperature range of 20 to 30 °C (68 to 86 °F). Hypernyms Associated seagrass species include Halophila engelmannii and Syringodium filiforme. [5] Decaying turtle grass leaves are responsible for the majority of detritus in meadow areas. The main propagation method is by extension of the underground rhizome, or stem. Thalassia hemprichii, autre espèce du même genre et elle aussi appelée "herbe à tortue", lui ressemble énormément mais vit en mer Rouge et dans le bassin Indo-Pacifique[4]. The flowers are large, greenish white to pale pink and produce prominent seed pods that often … THALASSIA TESTUDINUM: Species of Thalassia are the most abundant marine plant in the Caribbean. Tomlinson P.B. van Tussenbroek BI, Villamil N, Marquez-Guzman J, Wong R, Monroy-Vilazquez LV, Solis-Weiss V. 2016. There might be some translation errors. [3] Le fruit, de couleur verte à vert-jaune ou rouge, est sphérique et a une peau rugueuse, couverte de petites pointes. Leur extrémité est arrondie et les racines (rhizomes) forment un tapis enfoui dans le sable ou parfois apparant. Les graines sont en forme de poire. Max Depth 10 meters. In general, the population of this grass is stable. It is considered relatively rare in the country, and listed as “Critically Endangered” in … This buoyant fruit acts as a transportation vessel as it continues to develop. Provided by Smithsonian Institution, Richard A. Howard Photograph Collection. Elle est consommée par les tortues, d'où son nom vernaculaire. This grass favours high-salinity waters with low turbidity, such as calm lagoons. Seagrass meadows (Thalassia testudinum) on the shelf are believed to be among the most extensive beds in the Caribbean, if not the world (Zieman per. Bacteria (common noun bacteria, singular bacterium) is a type of biological cell. [16][14][15][17] These creatures were attracted to the seagrass’s nutritious mucilage—a carbohydrate-rich substance that houses pollen. N° 1965. Indian River Lagoon, FL, was provided by Hall and Eiseman (1981). Range: Western Atlantic Ocean: Florida south to the Gulf of Mexico, including Bermuda and the West Indies, and south to Venezuela. Genus Thalassia. Extensive meadows can be formed on muddy sand, and coarse sandy and clayey seabeds, especially those with a calcareous content. Elles mesurent 30 cm de longueur en moyenne (en fait entre 10 et 60 cm) pour 0,4 à 1,8 cm de largeur[1],[2]. Accessed Jul. On the morphology and anatomy of turtle grass, Van Tussenbroek BI, Wond JGR, Marquez-Guzman J. Turtle grass is dioecious, which means that there are separate male and female plants, each which produce an imperfect flower containing only one sex. Classification. Of these, 6 are known throughout the tropical western hemisphere, while Halophila johnsonii is known only from coastal lagoons of eastern Florida, . Thalassia is a marine seagrass genus comprising two known species.. [5] Female turtle grass fruits develop into green capsule about 20–25 mm in diameter and can include 1-6 small seeds. [7], Turtle grass can reproduce both through vegetative and sexual reproduction. Some nodes are leafless but others bear a tuft of several erect, linear leaf blades. Thalassia est un genre de plantes monocotylédones sous-marines de la famille des Hydrocharitaceae. 2008. Thalassia testudinum (Turtle Grass) Eukaryote Kingdom Plantae Phylum Angiospermophyta Genus Thalassia Species Thalassia testudinum Order: Alismatales Family: Hydrocharitaceae. It forms meadows in shallow sandy or muddy locations in the Caribbean Sea and the Gulf of Mexico . Cette espèce vit dans les mers bordant les Caraïbes et dans le golfe du Mexique ; elle pousse donc sur les côtes atlantiques des États-Unis (du Texas à la Floride), du Mexique, de l'Amérique centrale, des îles des Caraïbes et des Antilles, ainsi que de la Colombie et du Venezuela, en Amérique du Sud. T. testudinum has both staminate and pistillate flowers. This is one way viviparous seedlings can start new patches of seagrass. Turtle grass can also sexually reproduce through the production of underwater flowers and hydrophily. La floraison a lieu en mai-juin, alors que les journées sont longues en jours longs (mai-juin), la fructification entre juin et juillet, et les fruits mûrs se détachent de la plante-mère au cours du mois d'août[4]. [18], Rhizomatous green algae in the genus Caulerpa often live among the grasses and many animal make seagrass meadows their home. Elle n'a pas été observée plus au nord que Cape Canaveral, en Floride[1]. Il mesure de 1,5 à 2,5 cm de diamètre et s'ouvre en 5 à 8 valves irrégulières[2]. Thalassia hemprichii ( Asch. L'Halodule beaudetti, qui vit dans les mêmes zones, a des feuilles d'un longueur moyenne plus courte, à l'extrémité moins arrondie et plus déchiquetée[4]. 1964. Elle est consommée par les tortues, d'où son nom vernaculaire. (König & Sims) 2: 96 Haynes, Robert R. / Flora of North America Editorial Committee (eds. ex K.D.Koenig (1805) In: Ann. Bot. Le nom générique Thalassia , du grec thalassa (« mer ») et du suffixe latin -ia (« relatif à ») [ 2 ] , [ 3 ] , désigne une plante marine. There might be some translation errors. Thalassia testudinum | Banks & Solander ex König . [3], Thalassia testudinum is a perennial grass growing from a long, jointed rhizome. Thalassia. It is found from the low-tide mark down to depths of 30 metres (98 ft), depending on water clarity. Marine Ecology Progress Series. slideshow. Observations on the reproductive ecology of, Phillips RC, McMillan C, Bridges KW. [5] It has been found that where plants have been damaged mechanically, such as by the propellers of boats, the cut ends of rhizomes are unable to grow and holes may develop in the turtle grass meadow.[4]. However, it is not a legal authority for statutory or regulatory purposes. Noms. Order Alismatales. Likely Fish-Only Tank Suitable . It cannot grow in fresh water but some growth is possible at a salinity of 10 parts per thousand. Les feuilles vertes linéaires, dressées dans l'eau, poussent groupées autour d’une tige très courte. 1981. L'extension d'un banc de cette herbe se fait grâce à un marcottage naturel par le développement de l'extrémité des rhizomes. Thalassia testudinum turtle grass Classification. Cette plante est originaire de l'Atlantique ouest et vit dans les mers tropicales. Translation in process We're updating the page. 20. Female plants typically grow one green flower, while males often produce three to five pink or white flowers. Les débris de végétaux morts s'accumulent dans la zone de calme ménagée par les feuilles vivantes, contribuant à l'épaississement de la couche de sédiments[2]. Autres noms communs français. Translation in process We're updating the page. Seven species of seagrass occur in the IRL. Experimental evidence of pollination in marine flowers by invertebrate fauna. Sorry about that ;-) Coraux fossiles . (2012): Beautiful Seagrasses – Keeping True Flowering Plants in Your Marine Aquarium|Reefland.com. Accessed: 2018 Jul. Free and Open Access to Biodiversity Data. Thalassia testudinum et Syringodium filiforme sont les plus communes des 5 phanérogames marines de la région Caraïbe. There might be some translation errors. Thalassia in The Plant List Version 1.1. Tropicos.org 2018. [18], Turtle grass and other seagrasses form meadows which are important habitats and feeding grounds. The grass is eaten by turtles, herbivorous parrotfish, surgeonfish, and sea urchins, while the leaf surface films are a food source for many small invertebrates. Many epiphytes grow on the grasses, and algae, diatoms and bacterial films cover the surface of the leaf blades. Seasonal variation of turtle grass, Moffler MD, Durako MJ and Grey WF. L'ovaire ne présente qu'une seule loge ; il est surmonté de 7 ou 8 styles[2]. Thalassia testudinum autres noms : thalassie nom anglais : turtle grass Végétaux / Herbiers / Herbe plate Taille adulte 20cm - 1m Profondeur 1 - 20m Les feuilles de cette herbe verte font typiquement 30 cm de long, 4 à 12 mm de large, avec 9 à 15 veines paralléles. [4][5] These are up to 30 centimetres (12 in) long and 2 cm (0.8 in) wide and have rounded tips. Published online. Phylum: Angiospermophyta Genus: Thalassia Species: Thalassia testudinum Common Name: Turtle- Grass. Thalassia. USDA plants profile for Thalassia Class Liliopsida. Les feuilles ralentissant le courant et les rhizomes implantés dans les sédiments permettent une stabilisation du substrat et limitent fortement son érosion. Chaque fleur porte 9 étamines libres dans lesquelles le pollen est englué dans une matrice gélatineuse ; la propagation de ce dernier se fera dans l'eau[2],[4]. Thalassia testudinum. Disclaimer: ITIS taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. [15][11] After about 8 weeks of growth, the fruit undergoes dehiscence (botany), which releases neutrally buoyant seeds into the water column. Atlantique tropical ouest Clé d'identification . Nature Communications [Internet]. Thalassia testudinum. It often grows in meadows with other seagrasses where it is the climax species. En poursuivant votre navigation sur ce site, vous acceptez l’utilisation de cookies pour vous proposer des contenus et services adaptés et réaliser des statistiques de visites. Cette plante est originaire de l'Atlantique ouest et vit dans les mers tropicales. The leaves are ribbon-like, about ½ inch wide and often reach heights of up to 14 inches long. Synchronized anthesis and predation on pollen in the marine angiosperm. La dernière modification de cette page a été faite le 5 novembre 2017 à 13:52. The flowers, fruits and seeds of. : One such episode in 1987 killed off a large proportion of the plants and the resulting increased sedimentation and greater growth of epiphytes on the remaining plants caused a secondary dieback event. The Seegras is food for turtles and manatee, nursery for juvenile species and producer of Oxygen. Underwater video cameras have more recently revealed crustaceans, polychaetes, and amphipods swimming towards open male flowers. - Pacific Turtlegrass (shores of the Western and Central Indo-Pacific); Thalassia testudinum (Banks ex K.D.König) - Caribbean Turtlegrass (Gulf of Mexico, Caribbean Sea, and Bermuda); References Although asexual propagation results in an increase in the size of the turtle grass bed, extensive asexual reproduction limits genetic diversity and can put the meadow at severe risk if there is a disease outbreak. As the invertebrates feed on the mucilage, excess pollen grains stick to their bodies. Les bordures sont entières, les 9 à 15 nervures sont fines[2]. 1981. Thalassia testudinum également appelée « herbe à tortue », est une plante qui pousse sur les fonds marins tropicaux et forme des herbiers qui constituent des zones de frai pour les poissons. Thalassie, herbe à lamantin, mais ce dernier nom est plutôt utilisé pour désigner une autre phanérogame marine : Syringodium filiforme. Taxonomie de Thalassia testudinum : noms scientifiques et vernaculaires, classification, synonymie, arbre taxonomique. It forms meadows in shallow sandy or muddy locations in the Caribbean Sea and the Gulf of Mexico. [11][12][13] At night when male flowers are fully mature, they release mucilaginous pollen into the water column. Phylum PLANTS-STREPTOPHYTA: NCBI Taxonomy ID 55497. Thalassia f. A taxonomic genus within the family Hydrocharitaceae – certain seagrasses. Synonyms. [8][9][10] The small flowers are each borne by a peduncle. Thalassia hemprichii is a species of seagrass native to the island-state of Singapore (See distribution). ex Koenig Show All Show Tabs turtlegrass General Information; Symbol: THTE6 Group: Monocot ... or see all the Thalassia thumbnails at the Plants Gallery ©Richard A. Howard. Elles subissent l’action de la mer et sont fortement érodées. Les coraux (Scléractinaires) sont constitués de colonies de polypes. In hydrophilic pollination, the pollen grains are carried through the water column by tides or currents and deposited upon an open pistillate flower. Les fleurs staminées (mâles) se forment par inflorescence de 1 à 3 fleurs[2]. One green flower, while males often produce three to five pink or white flowers ]! This buoyant fruit acts as a transportation vessel as it continues to develop in about weeks... Rc, McMillan C, Bridges KW de 7 ou 8 styles [ 2.! Plante, s'abritent ou se reproduisent dans la zone de calme créée entre ses,... 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Not a legal authority for statutory or regulatory purposes du substrat et limitent son. Scientific consensus available, and amphipods swimming towards open male flowers move from to!, est sphérique et a une peau rugueuse, couverte de petites.! Feuilles, notamment la tortue verte ( Chelonia mydas ) [ 1 ] clonal colonies which are genetic replicates the. Reefs, sand, and rubble bottoms at depths between 0 to 10 meters possible at a salinity of parts. In clusters from short stalks ; they are flat, 4-18 mm wide and may be cm... This increase in rhizome length results in asexual ramets, or clonal colonies which are important habitats feeding... The Gulf of Mexico [ 5 ] Decaying turtle grass leaves are responsible for majority... Clonal colonies which are important habitats and feeding grounds l'extrémité de la mer et sont fortement érodées,... 10 parts per thousand meadows with other seagrasses where it is the dominant in! Hemprichii is a species of marine seagrass, van Tussenbroek BI, Villamil n, Marquez-Guzman J Thalassia hemprichii a! Develop into green capsule about 20–25 mm in diameter and can include 1-6 small seeds pollination the! Racines ( rhizomes ) forment un tapis enfoui dans le sable ou parfois.! ’ action de la feuille est arrondie et les rhizomes implantés dans les mers.. Interested parties, 1805 Common names turtle-grass in English turtlegrass in English Bibliographic References turbidity, such calm! Les sédiments permettent une stabilisation du substrat et limitent fortement son érosion vertes linéaires, dressées dans,!, Rhizomatous green algae in the order and more than 356 species tirant le... ( König & Sims ) 2: 96 Haynes, Robert R. / of! And often reach heights of up to 14 inches long the Caribbean Sea and Gulf... Par les tortues, d'où son nom vernaculaire this increase in rhizome results! Des feuilles arrondie rhizomes rampant sur fond sableux nom vernaculaire of underwater flowers and.! Rose jusqu ' à rose pâle et sont fortement érodées de cette plante est originaire de l'Atlantique et! ' a pas été observée plus au nord que Cape Canaveral, en Floride 1... And producer of Oxygen testudinum is found from the low-tide mark down to depths 30... About that ; - ) Thalassia is a marine seagrass ( König & Sims 2. Swimming towards open male flowers: hydrophily and biotic pollination Thalassia hemprichii is species. Seedlings can start new patches of seagrass native to the island-state of Singapore See! Marine flowers by invertebrate fauna les organes sont normalement entièrement immergés de nombreuses espèces marines se! Animal make seagrass meadows their home fleur pistilée par inflorescence femelle column by tides or currents and upon. The leaf blades, dressées dans l'eau, poussent groupées autour d ’ une tige courte! Parent plant species and producer of Oxygen that often … phylum Magnoliophyta is by extension of the parent.! From short stalks ; they are finely veined and rounded at the tips are each borne by peduncle! General, the seedling will begin to develop in about 2–4 weeks if fertilization occurred NCBI Tax ID 55497 Sea... The new location has favorable environmental conditions, the seedling will begin to grow or white flowers la de!, Durako MJ and Grey WF in about 2–4 weeks if fertilization occurred 10 ] the flowers... Se forment par inflorescence femelle ce dernier nom est plutôt utilisé pour désigner une autre phanérogame marine Syringodium... Rocks, and algae, diatoms and bacterial films cover the surface of the rhizome. Leafless but others bear a tuft of several erect, linear leaf blades cameras have more recently crustaceans. Famille des Hydrocharitaceae not grow in fresh water but some growth is at..., s'abritent ou se reproduisent dans la zone de calme créée entre ses feuilles variation of grass! Tirant sur le vert ou le rose jusqu ' à rose pâle et sont fortement érodées provided Smithsonian... Utilisé pour désigner une autre phanérogame marine: Syringodium filiforme pollen from male to female between seagrasses and reef... Ouest et vit dans les sédiments permettent une stabilisation du substrat et limitent fortement son érosion ) depending... 2–4 weeks if fertilization occurred ( mâles ) se forment par inflorescence.! Grass fruits develop into green capsule about 20–25 mm in diameter and can include 1-6 small.., polychaetes, and amphipods swimming towards open male flowers 0 to 10 meters ' rose. Des Hydrocharitaceae couverte de petites pointes singular bacterium ) is a species of marine seagrass form meadows are!