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Statements

Subject Item
dbr:Halophila_johnsonii
rdf:type
dbo:Plant dbo:Species dbo:Eukaryote wikidata:Q19088 umbel-rc:Plant owl:Thing wikidata:Q756
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
n4:Johnsons_seagrass.jpg n4:Johnsons_seagrass_bed.jpg
dcterms:subject
dbc:Endemic_flora_of_Florida dbc:Halophila
dbo:wikiPageID
12937900
dbo:wikiPageRevisionID
1058944484
dbo:wikiPageWikiLink
dbr:Hydrocharitaceae dbr:Plantae dbr:Herbivorous dbr:Seagrass dbc:Halophila dbr:Monocots dbr:National_Oceanic_and_Atmospheric_Administration dbr:West_Indian_manatee dbr:Alismatales dbr:Angiosperms dbc:Endemic_flora_of_Florida dbr:Biscayne_Bay dbr:Thermal_pollution dbr:Halophila dbr:Dredging dbr:Eutrophication dbr:Turbidity dbr:Florida n18:Johnsons_seagrass_bed.jpg dbr:Sebastian_Inlet dbr:Green_sea_turtle
dbo:wikiPageExternalLink
n11:johnsonsseagrass.htm
owl:sameAs
freebase:m.02z0mgc wikidata:Q5643434 dbpedia-vi:Halophila_johnsonii n19:4k9z3
dbp:wikiPageUsesTemplate
dbt:Wikispecies dbt:Reflist dbt:Taxonbar dbt:Taxobox dbt:Italic_title dbt:Short_description
dbo:thumbnail
n4: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
dbr:Alismatales
dbp:regnum
dbr:Plantae
dbp:species
H. johnsonii
dbp:status
G2
dbp:statusSystem
TNC
dbp:unrankedClassis
dbr:Monocots
dbp:unrankedDivisio
dbr:Angiosperms
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
dbr:Seagrass
prov:wasDerivedFrom
wikipedia-en:Halophila_johnsonii?oldid=1058944484&ns=0
dbo:wikiPageLength
3504
dbo:conservationStatus
G2
dbo:conservationStatusSystem
TNC
dbo:class
dbr:Monocots
dbo:division
dbr:Angiosperms
dbo:family
dbr:Hydrocharitaceae
dbo:genus
dbr:Halophila
dbo:kingdom
dbr:Plantae
dbo:order
dbr:Alismatales
foaf:isPrimaryTopicOf
wikipedia-en:Halophila_johnsonii