Saturday, January 24, 2009

Mangrove Ecology. :D

There are three types of mangroves.
  • Red Mangrove (Rhizophora Mangle)
  • Black Mangrove (Avicennia Germinans)
  • White Mangroves (Laguncularia Racemosa)
Mangrove's Relation to the Ecology.

Ecology is the scientific study of the distribution and abundace of life and the interactions between organisms and their natural environment. The environment of an organism includes physical properties, which can be described as the sum of local abiotic factors such as insolation (sunlight), climate, and geology, and biotic ecosystem, which includes other organisms that share it's habitat.

The word "ecology" is often used more loosely in such terms as social ecology and deep ecology and in common parlance as a synonym for the natural environment or environmentalism. Likewise, "ecologic" or "ecological" is often taken in the sense of environmentally friendly.

The term ecology or oekologie was coined by the German biologist Ernst Haeckel in 1866, when he defined it as "the comprehensive science of the relationship of the organism in the environment." Haeckel did not elaborate on the concept, and the first significant textbook on the subject (together with the first university course) was written by the Danish botanist, Eunenius Warming. For this early work, Warming is often identified as te founer of ecology.

Species of flora and fauna.
Flora

  • Swamp fern
  • Nipah
  • Rhizophora sp.
  • Avicennia sp.
  • Bruguiera cylindrica
  • Blind-your-eyes
  • Sea Hibiscus
  • Sea Holly
  • Sea Poison
  • Sea Derris
  • Ceriops tagal

Fauna

  • Barnacle
  • Creeper Shell
  • Horseshoe Crab
  • Drill
  • Mud lobster & mud lobster mound
  • Mangrove oyster
  • Archer fish
  • Cicada
  • Spider
  • Collared kingfisher
  • Crab
  • Mudskipper
  • Nerita
  • Otter

Physical and Human threats of Mangroves

In addition to providing protection to the shorelines and a home for many organisms, mangroves provide many different uses for humans. For instance, mangroves are cut down to burn and produce charcoal. The charcoal is used for home cooking fuel and is also used in barbecues in the urban centres and tourist resorts. "To make charcoal, the burnt trunks and branches are stacked in a mound and covered with mud or soil and vegetation to ensure that the wood smoulders slowly for several days. The longer the wood smoulders the better the quality of the charcoal" (Bellamy & Dugan, 1993). The trees are also used for construction purposes. Not only are mangroves cut down to provide land to develop along the coastline, the larger trees are used to build the buildings, and the thinner poles/branches are used for roofing purposes.

One safe use of the mangrove trees is fishing. The mangroves support the fisheries due to the many different species of fish that live within the roots of these trees. A positive feature of this use of the mangroves is that it does not require the destruction of the mangrove trees. A dangerous threat to mangroves is oil spills. Oil spills are a large cause of destruction to the many organisms that thrive in the mangroves.

The coastal habitats in Singapore, in particular the mangrove and the adjacent wetland areas, are rapidly being destroyed and degraded due to development and its side effects. For successful securing of the future of the mangroves, public awareness of mangroves and politically and publicly supported, integrated conservation programmes are needed. However, due to the lack of public awareness about the pressing issue of nature conservation and the insufficiency in the understanding of the importance of mangroves by decision-makers, plans and actions for the conservation of the remaining mangroves have been scarce and inadequate. This manuscript will give a brief introduction to mangroves in Southeast Asia, and summarise the history of the development of mangrove areas in Singapore and the current situation pertaining to natural habitats and conservation in Singapore. It will point out the inadequacy of mangrove conservation thus far in Singapore, highlight the paucity of baseline data pertaining to mangroves in Southeast Asia, discuss the problems stemming from the lack of public awareness, argue for the conservation of Singapore's remaining mangroves and propose conservation strategies and local and regional research directions.

Where can we find mangroves in Singapore?
  • Sungei Mandai Mangroves
  • Sungei Buloh Nature Reserve

Photos



This is a picture of the Barringtonia Asiatic.
Putat Laut is the Malay name for this plant.

It is a small to large sea-shore tree reaching up to 15 meters with a greyish and smoot bark. The large and thick leathery leaves are spirally arranged and shiny. The young leaves are pinkish olive with pink veins whereas the old leaves are withering yellow to pale orange. The large flowers have white stamens ending with tinged pink. They are heavily scented and open at dusk. The large and buoyant fruit is 10cm in diameter and contains a large seed. It is squarish at the base and tapering towards the tip like a pyramid.

The green fruit contains saponin which is used as fish poison. Ash from the seed mixed with other ingredients can be applied externally to treat colic. The seeds can also be consumed to expel internal worms. The heated fresh leaf can be applied to treat stomachache and rheumatism.



This is a picture of a cicada.

The cicada is an insect of the order Hemiptera, suborder Auchenorrhyncha, in the superfamily Cicadoidea, with large eyes wide apart on the head and usually transparent, well-veined wings. There are about 2,500 species of cicada around the world, and many remain unclassified. Cicadas live in temperate to tropical climates where they are among the most widely recognized of all insects, mainly due to their large size and remarkable acoustic talents. Cicadas are sometimes colloquially called "locusts", although they are unrelated to true locusts, which are a kind of grasshopper. They are also known as "jar flies". Cicadas are related to leafhoppers and spittlebugs. In parts of the southern Appalachian Mountains in the United States they are known as "dry flies" because of the dry shell they leave behind.

Cicadas are benign to humans and do not bite or sting, but can be pests to several cultivated crops. Many people around the world regularly eat cicadas: the female is prized as it is meatier. Cicadas have been (or are still) eaten in Ancient Greece, China, Malaysia, Burma, Latin America and the Congo. Shells of cicadas are employed in the traditional medicines of China.

The name is a direct derivation of the Latin cicada, meaning "buzzer". In classical Greek it was called a tettix, and in modern Greek tzitzikas - both names being onomatopoeic.



Excoecaria agallocha
Buta Buta is the Malay name for it.
It is also commonly known as Blind-your-eyes.

Buta-buta has poisonous milky sap that blinds temporarily if it gets into the eye. 'Buta' means 'blind' in Malay; the tree is also called 'Blind-your-eye'. The sap can also cause blisters and skin irritation.

Buta-buta has small pointed leaves which are pinkish when young, turning green as they mature. Old leaves turn bright red when they are about to drop off. The tree often has multiple trunks.

Each tree bears either male or female flowers. So when they are in bloom, the trees can look confusingly different! The tiny flowers are wind pollinated. The little brown fruit capsules explode when ripe to disperse the seeds by water. The seeds have an air space within the seed coat to help them float. They don't germinate on the parent tree.

The tree grows further inland usually at the high water mark. It can grow in both stony and muddy ground, and tolerates dry and salty conditions. It grows quickly in open areas, but can also survive in the shade.

Buta-buta is well used by coastal communities. Some use the sap as an ingredient in arrow poison, others to stun and catch fish. The timber is soft, white, light with a fine grain and rots quickly. Nevertheless, in some places, the tree is an important source of cheap planks, matches and matchboxes, and pulp for paper. The timber is easily transported by water as it floats. It is also used as firewood and converted into charcoal. Various parts of the tree is used in traditional medicine to treat sores and stings from marine creatures. The tree is also being tested for modern medical uses. Modern clinical trials show that the plant may have anti-HIV, anti-cancer, anti-bacterial and anti-viral properties.

Buta-buta is still commonly seen in mangroves. However, mangroves as a habitat is threatened particularly on the mainland by development, reclamation and other destructive human activities.



Avicennia sp.
Also known as pencil roots/breathing routes.

As there is no oxygen in the soil, the breathing routes are implanted for exchange of gases when there is low tide. It has a pencil-like feature.



Monitor lizard.

Monitor lizards are members of the family Varanidae, a group of carnivorous lizards which includes the heaviest living lizard, the Komodo dragon, with the crocodile monitor being the longest in the world. Varanidae is monotypic, containing only the genus Varanus. Their closest living relatives are the anguid and helodermatid lizards.

Monitor lizards are generally large reptiles, although some can be as small as 12 centimetres in length. They have long necks, powerful tails and claws, and well-developed limbs. Most species are terrestrial, but arboreal and semi-aquatic monitors are also known. Almost all monitor lizards are carnivorous, although Varanus prasinus and Varanus olivaceus are also known to eat fruit. They are oviparous, laying from 7 to 37 eggs, which they often cover with soil or protect in a hollow tree stump.



Horseshoe Crab

The horseshoe crab or Atlantic horseshoe crab (Limulus polyphemus) is a marine chelicerate arthropod. Despite its name, it is more closely related to spiders, ticks, and scorpions than to crabs. Horseshoe crabs are most commonly found in the Gulf of Mexico and along the northern Atlantic coast of North America. A main area of annual migration is Delaware Bay, although stray individuals are occasionally found in Europe.

The other three species in the family Limulidae are also called horseshoe crabs. The Japanese horseshoe crab (Tachypleus tridentatus) is found in the Seto Inland Sea, and is considered an endangered species because of loss of habitat. Two other species occur along the east coast of India: Tachypleus gigas and Carcinoscorpius rotundicauda. All four are quite similar in form and behavior.

The extinct diminutive horseshoe crab, Lunataspis aurora, 4 centimetres from head to tail-tip, has been identified in 445-million-year-old Ordovician strata in Manitoba.



Mudskipper.

Mudskippers are usually found in mangrove swamps at the estuaries of rivers. The mud deposited by the rivers here is a suitable place for mudskippers to build their burrows. There is no shortage of food, as algae and small animals like worms, crabs and snails on which they feed are found in abundance in the waters and mudflats.

These strange creatures of the swamp are fish that do not behave like fish: they hop out of the water, "walk" across the mud and even climb trees. They are equally at home on land and in water. Come to Sungei Buloh Nature Park, and don't forget to bring your binoculars. The best places in the Park to observe mudskippers are the Mangrove Boardwalk at the Visitor Centre and the Mangrove Arboretum. You'll be fascinated when you spot mudskippers—some veritable giants among them—lazing in their private mud pools at low tide.

Using its powerful pectoral fins as legs, the mudskipper crawls around in the mud. When disturbed, it seeks the safety of water by using its tail to hop across the mud. Back in the water, it swims around like other fishes do, but keeps its head above water.

Sometimes, the fish "treads water" by flexing its tail slowly from side to side. When provoked, it flips its tail vigorously from side to side, and leaps across the water before settling back for a swim.

Can you breathe through your skin? The mudskipper can!! In water, the mudskipper breathes through gills like other fishes do. However, when on land, it carries around its own "air tanks"; a mixture of air and water in its gill chambers. The blood vessels in the gills absorb the oxygen as the water passes through the gills. When the oxygen is used up, a fresh mouthful of water is gulped in.



Collared Kingfisher.

The Collared Kingfisher (Todiramphus chloris) is a medium-sized kingfisher belonging to the family Halcyonidae, the tree kingfishers. It is also known as the White-collared Kingfisher or Mangrove Kingfisher.

The Collared Kingfisher is 22 to 29 cm long and weighs 51 to 90 grams. It varies from blue to green above while the underparts can be white or buff. There is a white collar around the neck, giving the birds its name. Some races have a white or buff stripe over the eye while others have a white spot between the eye and bill. There may be a black stripe through the eye. The large bill is black with a pale yellow base to the lower mandible.

Females tend to be greener than the males. Immature birds are duller than the adults with dark scaly markings on the neck and breast.

It has a variety of calls which vary geographically. The most typical call is loud, harsh and metallic and is repeated several times.

The Why's and How's...

Mangroves have been have been destroyed all over the world, leaving only a little left because mangroves are used for food production, traditional medicines, fuel wood, and construction materials. Mangroves can be destroyed by builders, chopping or shrimp farming.
How can we conserve mangroves?
We can conserve mangroves by not stepping on their roots, as their roots are soft and fragile which mangroves use to breathe. We can also try not to leave any litter around the mangrove trees. Telling people to conserve mangroves as they are needed and are living organisms also helps as people would try not to harm them.

PERSONAL REFLECTIONS

This trip to Sungei Buloh Wetland Reserve has been a great excursion as we learnt about nature and at the same time had a fun time with our friends. We learnt loads about different types of mangroves and other animals such as the mudskipper and crabs.I would like more excursions like this.


Chloe Lie [2] 2-6A
Personal Reflections
Mangroves are important to the economy, as it servesas a protection. It protects uplands from storm winds, waves and floods. It also stops erosion, by stabalizing shorelines with their specialized root systems. It is part of nature and I feel that man do not have the right to destroy it.
Priscilla Lay [11]
2-6B

Reflections :)

I feel that mangroves are important as it has several medicinal purposes like for treating skin disorders and sores. The ashes or bark infusions of certain species of mangrove can be used to be treated. Mangroves are also a source of timber, fuel, railroad ties and tannin in the tropics. Having a short crop rotation period makes red mangroves a popular choice for posts and poles in managed forests in Malaysia. In Asia, commercial mangrove production is necessary for the construction of boats, houses and furniture. Mangroves should also be conserved as there is not many mangroves left.

This trip to Sungei Buloh was fruitful as I got to learn many interesting facts about flora and fauna, and the beauty of nature.

Sherlyn ♥