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Statements

Subject Item
dbr:List_of_endangered_plants_in_North_America
dbo:wikiPageWikiLink
dbr:Halophila_johnsonii
Subject Item
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dbr:Halophila_johnsonii
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dbr:Halophila_johnsonii
rdf:type
wikidata:Q19088 umbel-rc:Plant dbo:Plant dbo:Species owl:Thing wikidata:Q756 dbo:Eukaryote
rdfs:label
Halophila johnsonii
rdfs:comment
Halophila johnsonii, or Johnson's seagrass, is a small, asexual seagrass in the family Hydrocharitaceae (the "tape-grasses"). It occurs only on the southeastern coast of Florida, and was the first marine plant listed on the United States endangered species list, where it is listed as a threatened species. Female flowers have been observed, but even with decade long observational studies, neither male flowers nor seed have ever been observed.
foaf:name
Johnson's seagrass
dbp:name
Johnson's seagrass
foaf:depiction
n13:Johnsons_seagrass_bed.jpg n13:Johnsons_seagrass.jpg
dcterms:subject
dbc:Halophila dbc:Endemic_flora_of_Florida
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1058944484
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dbr:Herbivorous dbr:Monocots dbr:Seagrass dbr:Plantae dbr:Alismatales dbr:Green_sea_turtle dbr:Halophila dbr:Turbidity dbr:Dredging dbr:Thermal_pollution dbc:Halophila dbr:Eutrophication dbr:Sebastian_Inlet dbr:West_Indian_manatee n19:Johnsons_seagrass_bed.jpg dbr:Biscayne_Bay dbr:Hydrocharitaceae dbr:National_Oceanic_and_Atmospheric_Administration dbr:Angiosperms dbc:Endemic_flora_of_Florida dbr:Florida
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n13:Johnsons_seagrass.jpg?width=300
dbp:binomial
Halophila johnsonii
dbp:binomialAuthority
Eiseman and McMillan
dbp:familia
dbr:Hydrocharitaceae
dbp:genus
Halophila
dbp:imageCaption
Closeup of a bed of Johnson's seagrass
dbp:ordo
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dbp:regnum
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dbp:species
H. johnsonii
dbp:status
G2
dbp:statusSystem
TNC
dbp:unrankedClassis
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dbo:abstract
Halophila johnsonii, or Johnson's seagrass, is a small, asexual seagrass in the family Hydrocharitaceae (the "tape-grasses"). It occurs only on the southeastern coast of Florida, and was the first marine plant listed on the United States endangered species list, where it is listed as a threatened species. Female flowers have been observed, but even with decade long observational studies, neither male flowers nor seed have ever been observed. It may have the most limited distribution of all seagrasses. It occurs only in lagoons along roughly 200 km of the Florida coastline between Sebastian Inlet and the northern part of Biscayne Bay, where it grows in small patches of a few centimeters to a few meters in diameter at depths ranging from the intertidal zone down to 3 meters. Prior to 1980, the species designation was uncertain. It was sometimes referred to as either Halophila decipiens or H. baillonis Ascherson, despite most closely resembling H. ovalis. Morphologically, Johnson's seagrass is recognized by the presence of pairs of linearly shaped foliage leaves, each with a petiole formed on the node of a horizontally creeping rhizome. The rhizome is located at or just below the sediment surface and is anchored to unconsolidated substrate by unbranched roots. The leaves are generally 2-5 cm long (including the petioles), and the rhizome internodes rarely exceed 3-5 cm in length, making this species appear diminutive relative to the larger seagrasses. Both the Green sea turtle and the West Indian manatee are known to feed upon the plant, as well as some herbivorous fish. However, the main threat to species survival is probably human activity. Processes that threaten the plant include eutrophication, dredging, turbidity, and thermal pollution.
gold:hypernym
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wikipedia-en:Halophila_johnsonii?oldid=1058944484&ns=0
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3504
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G2
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TNC
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dbr:Monocots
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