Enhalus acoroides

14 10 2008

Enhalus acoroides

 

Category of Organisms

Seagrasses

Kingdom

Plantae

Phylum/Division

Magnoliophyta

Class

Liliopsida

Order

Hydrocharitales

Family

Hydrocharitaceae

Genus

Enhalus

Species

acoroides 

Binomial Name

Enhalus acoroides

 

Appearance: The leaves are very long and ribbon-like (30-150cm long, approximately 1-2cm wide) with many parallel veins and air spaces, generally dark green in colour and thick. The inrolled leaf margins make the leaves tough (hard to tear)

 

Distribution: Widely distributed in the tropical parts of the Indian Ocean and the Western Pacific and are very common in the Indo-Malay Archipelago and in the Philippines

 

Environment/habitat: Common in shallow intertidal areas with sandy and muddy substrata, but can extend down to 4m depth

 

Rhizome: Has thick rhizomes (underground stems) that are massive (1.5 cm in diameter), branching monopodially when a new shoot is formed. The rhizomes are densely covered with long black fibrous bristles which are the remnants of a leaf sheath. They have coarse, cord-like and hairless roots which have wide air-channels. The roots are 10-30cm long and 3-5mm thick arising from the axillary buds of the ventral leaves.

 

Propagule dispersal: The fruits are round and large (4-6cm in diameter) with dark, ribbed skin and 6-7 white seeds. When the ripe fruit bursts, the seeds are released and float for only about 5 hours before they start to sink. The seeds are estimated to be able to travel 42 km.  When the seeds settle, roots develop rapidly and the seeds germinate quickly. Enhalus acoroides spreads mostly by vegetative reproduction.

 

Reproduction: Flowers only in habitats where the flowers are exposed at low tides because this species undergoes aerial surface pollination. The seed upon liberation from the fruit germinates immediately after it sinks to the muddy bottom. Enhalus acoroides has white flowers- male flowers are tiny while female flowers are larger. The male Enhalus acoroides bears a single pedunculate inflorescence containing numerous flowers whilte the female Enhalus acoroides bear single uniflorous inflorescences. Flowering is more or less continuous over the year, and represents the investment of around 20% of above-ground production

 

Importance/Value: Enhalus with long strap-like leaves form good wave breakers and extensive beds give some protection to shorelines exposed to strong waves. Such thick vegetation also provides good hiding places for small species and the young of other organisms. It is a common food for the dugong. Tiny algae often grows on the leaves of this seagrass, providing food for grazing creatures such as snails. The fruits are sold as human food in the market and the seeds are eaten raw by coastal dwellers. Enhalus is highly productive and contribute greatly to oxygenation of the seas as well as carbon sequestration, leading to reduction in the effects of global warming.

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6 responses

4 11 2008
zee

thanks….. i need it to work my Home work from my lacture…. can you give me an other sea grass?…plz….. and e book about coral identification…..oke thanks again….

28 06 2009
Anna

I`ve been study about this particular seagrass which is Enhalus Acoroides but with different salinity level from 5,15,25, &32ppt of seawater and also the seed germination and development of seagrass.The expriment using Complete Randomized Design was carried but in 12 plastic containers (13 cm, diameter and 22 cm height). The effect of salinity on seed germination of Enhalus acoroides after 4 or 5 ays was not significant because of the seeds in different treatments germinated.

28 06 2009
Anna

That`s all!!! and Have a pleasant Day.

28 07 2009
labradorpark

Thanks for sharing your experience with us! (: hope that you will continue reading updates on our blog.

17 11 2012
Monreal D.

Hello everyone in your team. Your articles are great. They are useful to us students currently undergoing undergraduate thesis. Keep it up! May I suggest that it would be much appreciated if you’ll include citation at the bottom, so that it would be much easier to cite this helpful website. Thank you!

17 11 2012
Monreal D.

and kindly put the authors name please?

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