Jun

29

This story still decribe about Bawean Islands, especially about its coral ecosystem.  Bawean is an island on the north side of Gresik, East Java. it needs about 2 to 3 hours to go there by fast boat from Gresik Harbour, or we can reach Bawean by Susi Airlines from Juanda Airport.

I felt like on Kofiau Islands in Raja Ampat when i was standing on Bawean Island.  There were beautifull combination of natural colour, green hills, light blue sky, and deep blue sea.  Furthermore, we could  breathe in fresh air, and find colourfull corals in the sea.  Bawean islands has exotic underwater scenery, not only seagrasses, but also corals.

Eventually, i believe that East Java has its ordinary, and exotic islands, namely Bawean.  it has great lanscape and beautiful underwater colour.  Moreover, its community have a big challangges to integrate this coastal management.

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Jun

18

seagrass bed

seagrass bed

seagrass bed

seagrass bed

seagrass bed

seagrass bed

Jun

18

Cymodocea rotundata

Cymodocea rotundata

Enhalus acoroides

Enhalus acoroides

Halodule pinifolia

Halodule pinifolia

Halophila ovalis

Halophila ovalis

Jun

14

There are more than 50 specieses of seagrasses which are identified in the world.  These specieses are included in 13 genera, 7 generas are found in tropical area, and 5 generas are found in subtropical area. All of 7 genera of tropical seagrasses can be found in Indonesia, namely: Cymodocea, Enhalus, Halodule, Halophila, Syringodium, Thalassia, and Thalassodendron.

Those 7 genera of tropical sseagrasses can be indentified by looking detail at their leaves.  We must focus on seagrass leaves morphology. There are three kinds of seagrasses leaves morphology, scilicet: round looks like a stick; oval; and strap like.

First is round and long looks like a stick.  This leaves shape is belongs to Syringodium, which is the only one species in Indonesia, namely Syringodium isoetifolium.  This species has a coel in its leaves, hereinafter it allow air inside, so that we call it air cavity.  Syringodium isoetifolium is favourite food for Dugong and Seaturtle.

Second is oval and rounded.  We can identify that seagrasses, which has oval and rounded leaves  is Halophila, certainly.  There are three specieses that are known as Halophila, scilicet: H. ovalis, H. minor, H. Spinulosa.  Halophilla usually lives in coral reefs, which substrat is combination between sand and rubble.

Third, the last morphology is strap like.  This leaves morphology belongs to several specieses of seagrass. The longest, and bigest is Enhalus leaves, while the thinest and smallest belongs to Halodule.  The only one strap like leaves, that has petiole is Thalassodendron leaves.  Two other generas are Thalassia and Cymodocea, that have moderate size of their leaves, nevertheless both of them have distinction on their rhizome.  Thalassia has segment on its rizhomes, whilist Cymodocea has not.

Furthermore it will be easy to identify generas of seagrass, it is only by seeing carefully its leaves, or at least paying more attention to its rhizome.  Moreover, there are only 7 generas and 12 specieses, which are live in Indonesia, so that very simple to be remembered.

Jun

9

Coralogy is a subject that gives information about biology of coral, there are morfology and taxonomy; reproduction and respiration which are known as physiology;    and the last is coral’s habit, such as their activity with their symbion, and their feeding habit.  Yesterday, i taught this subject, and we discussed coral’s symbion and their relation with coral.  Coral has two kinds of symbion, namely intracell symbion and extracell symbion.

Intracell symbion is a symbion that lives inside the cell of coral.  The most popular intracell symbion of coral is zooxanthellae, marine algae that is classified as dinoflagellata.  Zooxanthellae do their photosynthesis by using carbon dioxide which is produced by coral respiration activity. Moreover, coral can save its  energy for feeding, inasmuch as coral obtains few energy that is generated from zooxanthellae’s photosyntesis process. The relation between zooxanthellae and coral is known as mutualism symbiosis.

Extracell symbion is a symbion that lives outside the cell of coral.  There are diverse categories of them, scilicet: fish, reptile, marine mammals, and invertebrate. Fish, that live around coral reefs are divided into three catagories, depending on their food, namely: hebivore, carnivore, and the last is omnivore.  The only one genus of reptile that lives in coral reefs ecosystem, is sea turtle, while there are two types of marine mammals live there, namely: Dugong and Dolphin. The last is invertebrate, the biggest classification of coral’s extracell symbion, which contain several phylum, such as: molusc, crustacea, echinoderm, and polychaeta. There are three kinds of symbiosis types that happen between corals and extracell symbion, namely: mutualism, parasitism, and komensialism.

These pharagraphs told that i taught about coral’s symbion and their types of symbiosis, yesterday.  There are two kind of coral symbions, namely intracell symbion and extracell symbion, furthermore there are three types of symbiosis that happen in coral reefs ecosystem, namely: mutualism, parasitism, and komensialism.

Oct

8

Selamat Datang di Universitas Brawijaya. Ini adalah posting pertamaku