Halophila stipulacea
Invasive seagrass spreading from Indian Ocean to Mediterranean and Caribbean.
Halophila stipulacea, a seagrass from the Hydrocharitaceae family, originally thrived in the Indian Ocean. Its spread began when the Suez Canal opened in 1869, allowing it to enter the Mediterranean Sea; this invasion was first recorded in 1894. The plant is now widespread in the Gulf of Aqaba. More recently, it reached the Caribbean, with initial sightings in Grenada (2002), Dominica (2007), and St. Lucia (2008). By 2017, it had spread to nineteen additional Caribbean islands. In the U.S. Virgin Islands, it appeared off St. John’s northeast coast in 2012, then on St. Thomas (2013) and St. Croix (2016). It was also first observed on Venezuela’s coast at Playa Mansa, near Naiguatá in Vargas state. Classified as invasive, *H. stipulacea* displaces native species by forming dense mats, adapting to changing conditions, and surviving across a wide depth range.
Quick Facts
- Genus
- Halophila
- Species
- stipulacea
Facts from the source article.
Lore & Background
Halophila stipulacea is native to the Indian Ocean. Its expansion into the Mediterranean Sea is suggested to have resulted from the opening of the Suez Canal in 1869, with the invasion first documented in 1894. The species is widespread through the Gulf of Aqaba.
In the Caribbean, the species was first reported in Grenada in 2002, Dominica in 2007, and St. Lucia in 2008. By 2017, it had expanded to nineteen other Caribbean islands. In the United States Virgin Islands, it was first observed in 2012 along the northeast coast of St. John, followed by St. Thomas in 2013 and St. Croix in 2016. It was also observed for the first time on the Venezuelan coast at Playa Mansa, near Naiguatá in Vargas state.
Halophila stipulacea has been classified as an invasive species because of its ability to displace native species. It can do this by forming thick mats, adapting to changes in environmental conditions, and existing along an extreme depth gradient.
Reader's Guide
Halophila stipulacea is significant as an invasive species that has successfully spread from its native Indian Ocean range into two new major regions: the Mediterranean Sea and the Caribbean. Its invasion into the Mediterranean is linked to the opening of the Suez Canal in 1869, with the first documentation in 1894. In the Caribbean, its spread has been rapid, first reported in 2002 in Grenada and expanding to nineteen other islands by 2017, as well as reaching the United States Virgin Islands and the Venezuelan coast. Its legacy lies in its demonstrated ability to displace native seagrass species through forming thick mats, adapting to environmental changes, and thriving across a wide depth gradient. This capacity for expansion and displacement has led to its classification as an invasive species, raising concerns for native marine ecosystems in the regions it colonizes.
Did You Know?
- Halophila stipulacea is in the Hydrocharitaceae family.
- Its invasion into the Mediterranean was first documented in 1894.
- It was first reported in the Caribbean in Grenada in 2002.
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