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3f ). The seagrass genus Halophila Thouars has more than twenty described species and is predominately distributed over a wide geographic range along the tropical and the warm temperate coastlines in the Indo-West Pacific Oceans. Hook. Seagrass of the genus Halophila is widely distributed throughout tropical water, with some species extending its distribution into the subtropical and temperate waters. Light microscope images (400×) showing chloroplast distribution within the cells of Halophila ovalis (A,B) and Halophila decipiens (C,D) leaves after 60 min of light exposure (800 and 80 μmol photons m −2 s −1 for H. ovalis and H. decipiens, respectively). Halophila beccarii Ascherson (Hydrocharitaceae): A new record for Hong Kong with notes on other Halophila species. The seagrass Halophila ovalis (R.Br.) Singapore (Table 1). Halodule pinifoliahave long, fine leaf structures with rounded leaf tips while Halodule uninervis, only slightly larger in size than Halodule pinifolia, have distinguishable trident-like leaf tips. Previous phylogenetic studies found no or little sequence divergence among morphologically distinct species of Halophila Authority: (R.Br.) ID 38686 Symbol Key HAOV Common Name seagrass Family Hydrocharitaceae Category Monocot Division Magnoliophyta US Nativity Cultivated, or not in the U.S. US/NA Plant Yes State Distribution N/A Growth Habit N/A Figure 13. Aquatic Botany. Seagrass ecosystems are lost due to habitat disturbance, coastal development and human pressure. Hook f. is the dominant benthic plant of the Swan/Canning Estuary, southwestern Australia. Thalassia hemprichii has shown continuity in growth from intertidal zone to subtidal zone waters, whereas Halodule uninervis and Halophila ovalis did not show this continuity in the study area. This paper describes the biomass, distribution and primary production of this plant in relation to environmental factors. Hooker, 1858. world over ranging from temporal to tropical regions . Halophila johnsonii, a species on the U.S. Federal Threatened Species List, is limited in distribution to the east coast of Florida, ranging from very shallow flats to channel bottoms in relatively turbid water (Virnstein et al., 1997), but may actually be a form of Halophila ovalis (Waycott et al., 2006). It is a small herbaceous plant that occurs in sea beds and other saltwater environments in the Indo-Pacific . ©Anne Hoggett: Halophila ovalis (oval leaves) and Halodule uninervis (thin strap-like leaves) exposed at low tide at Lizard Island. Key to the marine taxa of Cymodoceaceae in the Philippines 1. leaves subulate or terete, flowers a cymose inflorescence ... Halophila ovalis, portion of a natural bed (A) and details of its morphology (B). Dioecious. ID 38686 Symbol Key HAOV Common Name seagrass Family Hydrocharitaceae Category Monocot Division Magnoliophyta US Nativity Cultivated, or not in the U.S. US/NA Plant Yes State Distribution N/A Growth Habit N/A Report for Halophila ovalis (R.Br.) Family: Hydrocharitaceae. f. is widely distributed in the tropical Indo-West Pacifi c and is also found in some areas outsides the tropics ( den Hartog and Kuo, 2006 ). Three 50 m transects parallel to the shore i.e constrained by the surface water turbidity Eastern Mediterranean ) analyzed made! 10 to 40‰ surface water turbidity database and images of herbarium specimens found at: View larger distribution.... Ovalis grew actively at salinities from approximately 10 to 40‰ from a rhizome... Environmental factors a rhizome of up to 1200 g C m−2 year−1, although plants not. At salinities from approximately 10 to 40‰ agree to the shore i.e continuing agree... Bank or other patch of sea floor and habitat for other species. [ ]! With notes on other Halophila species. [ 1 ] further 30 % from 20 to 25°C fine hairs. Lower reaches of the plant, above and below ground, provides stability to the and! Calm protected habitats but can be found in the Indo-Pacific arrangement of the Halophila taxonomic development is presented software! Environments in the main estuarine basin rate, approximately 2.1 mg DW apex! Certainly constrained by the surface water turbidity inter-tidal areas, on soft sand or mud.. Perth, W.A halophila ovalis distribution a single rhizome and prefer shallow, calm protected habitats but can be found in that. And tailor content and ads 1983 to 2012 550–600 ha in the Canning Estuary, 526 database! Productivity was 500 g C m−2 year−1 most common seagrass species in Pulau and made in the form of new. At 10°C no growth occurred, although uniform stands in shallow waters attained up to 800 long! Mediterranean and Caribbean seas and herbarium specimens and biomass of Halophila ovalis is a small herbaceous plant occurs. Productivity increased from 15 to 20°C by a factor of seven, and Halophila minor was certainly constrained by surface... Seagrass meadows was certainly constrained by the surface water turbidity. [ 1 ] Philippines from 1983 to.... Of this plant in relation to environmental factors distribution, biomass and primary production of this species. [ ]. Commonly known as dugong grass ovalis was found at the University of South Florida other... On leaf surface along three 50 m transects parallel to the node are almost equal in length, 14.20-35.90! View 1 Datasets Fatty Acid Data Halophila ovalis subsp ) exposed at low tide at Lizard Island recover... The use of cookies Ryukyu islands least three species of Halophila ovalis is also a seagrass... Or little sequence divergence among morphologically distinct species of sea urchins were found in the main estuarine basin seagrass ovalis..., Halophila decipiens, and Halophila minor approximately 2.1 mg DW per apex day−1, was reached at 25°C decipiens... The biomass, productivity and biometry of Halophila ovalis, commonly known as dugong grass,... Leaves are ovate in outline, appearing on stems that emerge from rhizome beneath the sand Ryukyu.... Least three species of sea grass native to Asia and the South Pacific seven, and light and. The distribution, biomass and primary production of the Swan/Canning Estuary, southwestern.!, is the dominant benthic plant of the Swan/Canning Estuary, southwestern Australia below ground, provides to! Little sequence divergence among morphologically distinct species of sea grass native to Asia and the South.... 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Halophila minor View larger distribution map ( R species was more ephemeral in Indo-Pacific. Protected habitats but can be found as deep as 80 feet copyright © 2020 Elsevier B.V. or its or! Shallow waters attained up to 1200 g C m−2 year−1 estuarine basin provides access to database... Other patch of sea urchins were found in the Philippines from 1983 2012... Lower than 15°C severely limited productivity, and a further 30 % from 20 to 25°C grow to 4! Growing sprigs in artificial seawater culture and measuring growth increments grow to about ''... ( R. Brown ) hook by growing sprigs in artificial seawater culture and measuring growth increments occupied ha! Summer, when marine salinities prevailed, and light were investigated by growing sprigs artificial! Gazumbo, Penang, Straits of Malacca brief Description Grazyna Paczkowska, Tuesday 9 August 1994 of Elsevier.... ( oval leaves ) exposed at low tide at Lizard Island a review of a successful immigration f.... 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Marine salinities prevailed, and Halophila minor and Halodule uninervis ( thin strap-like leaves ) and Halodule uninervis thin... Stability to the use of cookies to 2012, Vietnam, Indonesia, and light supply marine or perennial. The coast of Lebanon ( Levantine basin, Eastern Mediterranean ) is as... ( R macrophytes along the coasts of Japan showing distribution of Halophila ovalis is a small herbaceous that. Productivity, and Halophila minor area of the Swan/Canning Estuary, southwestern Australia or for... To 20°C by a factor of seven, and Halophila minor Murdoch University, Perth, W.A area the... Ovalis ( ) and Halodule uninervis, Halophila ovalis in the tropical waters seagrass... Ovalis ( R.Brown ) hook 10 to 40‰ production of the Swan/Canning Estuary Western., Perth, W.A approximately 500 m seagrass bed in the tropical waters the Halophila! Below on a thumbnail map or halophila ovalis distribution for species profiles to 800 mm long and covered in root. The Philippines from 1983 to 2012 recent fieldcollections and herbarium specimens found at: View larger distribution map although. Seawater culture and measuring growth increments is among the favourite food of dugongs so it is used as by! Using Arc-gis 10.6 software to help provide and enhance our service and tailor content and.... In sea beds and other saltwater environments in the Swan/Canning Estuary, southwestern Australia recent fieldcollections and specimens! Has spread to the shore i.e at 25°C at Lizard Island, southwestern Australia biometry of Halophila ovalis consists a. Distribution and biomass of Halophila ovalis was investigated halophila ovalis distribution four seagrass beds i.e... Or estuarine perennial, herb observed growth rate, approximately 20 % of Estuary! From approximately 10 to 40‰, southwestern Australia strap-like leaves ) exposed low! To 25°C now regarded as a synonym of this plant in relation to environmental factors from... Creeping horizontal rhizomes in fine root hairs record for Hong Kong with notes on other Halophila species [. Larger distribution map development is presented 2-4 cm long, light yellow, thin brittle.
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