Monday, July 12, 2010

SPECIES AND THANKYOUS! :D

Due to an error,
no pictures from Camellia, I Chen and Jolene were actually able to be loaded as they were posted in the form of a video.
As that was taking FOREVER to load(practically 2 weeks+),
we decided to post the type of roots onto this post.
THANK YOU! :D
TYPE 1: PENCIL LIKE ROOTS! :D
[above : an approximately 45 degree downwards picture of the roots]

[above : close up shot]
type 2: PROP ROOTS! :D
[above, prop roots bathed in morning light]

[above: prop roots clearly depicted in afternoon light]
THANK YOU FOR VIEWING OUR PROJECT!!! :D
We hope that it has been of use!
Warmest Regards,
Jolene Teng Wen Jia(04)
Lin I Chen(05)
Camellia Ong Li Hui(08)
Pei Jie Ying(09)
Soh Hui Fang(10)
CLASS: 3H

Tuesday, June 22, 2010

AMAZON RAINFORESTS!!!

The Amazon rainforest is a moist broadleaf forest that covers most of the Amazon Basin of South America.

The majority of the forest is contained within Brazil, with 60% of the rainforest, followed by Peru with 13%, and with minor amounts in Colombia, Venezuela, Ecuador, Bolivia, Guyana, Suriname and French Guiana.

The Amazon represents over half of the planet's remaining rainforests, and it comprises the largest and most species-rich tract of tropical rainforest in the world.

Being a tropical rainforest, it has the following characteristics:

Distribution:
Between latitudes 10 ºN and 10 ºS

It has the same type of climate as MANGROVES.


Leaves:

  • Evergreen: Do not shed their leaves all year round.
  • Year round high temperature and rainfall enable them to photosynthesize
  • Continuously grow and shed leaves throughout the year
  • Broad, thick and leathery to withstand heat
  • Smooth and waxy to allow rainwater to run off easily
  • Have downward- pointing drip tips to allow excess water to drip off during regular conventional rain
Bark and branches:

  • Thin smooth barks
  • Branches found on top one-third portion of trunks
Roots:



  • Shallow as high rainfall provides much moisture in the top layer of soil
  • Nutrients found in top layer of soil
  1. Rapid decay of fallen leaves because of high temperatures and rainfall all year round


  2. Leaf litter decompose and form humus rapidly.
  • Therefore, tall trees have buttress roots that is 1-5m above ground.

Flowers and fruits:

  • Colourful flowers and sweet-smelling fruits to attract insects for pollination and birds for seed dispersal

Structure and layers: See previous posts

Diversity of plant species:

  • Dense
  • 750 species per hectare
  • 1500 species of other plants
  • Hardwoods for furniture making
Examples:


  1. Seraya
  2. Keruing
  3. Meranti
  4. Mahogany
  5. Chengal
Biodiversity in Amazon Rainforests:

  • About 2.5 million insect species, tens of thousands of plants, and some 2,000 birds and mammals.
  • To date, at least 40,000 plant species, 3,000 fish, 1,294 birds, 427 mammals, 428 amphibians, and 378 reptiles have been scientifically classified in the region.
  • One in five of all the birds in the world live in the rainforests of the Amazon.
Scientists have described between 96,660 and 128,843 invertebrate species in Brazil alone.

Dangerous creatures:

  • In the river, electric eels can produce an electric shock that can stun or kill.
  • Piranha are known to bite and injure humans.
  • Various species of poison dart frogs secrete lipophilic alkaloid toxins through their flesh.
  • There are also numerous parasites and disease vectors.
  • Vampire bats dwell in the rainforest and can spread the rabies virus.
  • Malaria, yellow fever and Dengue fever can also be contracted in the Amazon region.

Animals that live in MANGROVES

At high tide many different animals can move in and out of the mangroves easily. Food sources also move in and out with the tide.

The tangle of mangrove roots offers safe habitats for fish, shrimp, and oysters from their predators.

The roots help stop erosion by anchoring the ground and also lessening the effects of the waves. They prevent silt from damaging reefs and sea grass beds. They trap sediments that can contain dangerous heavy metals, keeping them away from inland waters and fragile animal (and human) populations.

Some examples of animals that live in Mangroves:

1. Cleaner shrimp



  • Colourful
  • Feeds itself by setting up a cleaning station on the reef.
  • Larger fish visit the cleaner and float motionless when the shrimp removes parasites and dead skin.
  • Some fishes even invite the shrimps into their mouths to clean, but never harm the bite-sized crustacean.


Hundred different species of BIRDS depend on the mangrove forest. The birds build nests on the mangrove branches every year and their chicks will do the same when they are older.

Mangroves are also home to manatees, monkeys, turtles, fish, monitor lizards, and, in parts of Asia, the fishing cat.

Fishing cat:

  • Able to swim!!!
  • Diet includes birds, small mammals, snakes, snails, and fish.
  • Attracts fish by lightly tapping the water's surface with its paw, mimicking insect movements.
  • Dives into the water to catch the fish.
  • Use its partially webbed paws to scoop fish, frogs, and other prey out of the water or swim underwater to prey on ducks and other aquatic birds.


The mangrove habitat can be divided into different zones, and different organisms can be found in each area.

Behind the mangroves, away from the water’s edge, is the driest area in this habitat, the salt flat. This area is only inundated during high spring tides i.e. when tides levels are highest. Thus, at low spring and high neap tides the salt flats are left exposed.

Consequently, animals that live on the salt flat are at risk of drying out and, therefore, have special adaptations that allow them to survive.

For example:
2. Mangrove crabs



  • Avoid this by living in burrows sealed by ‘plugs’.
  • Improve the nutritional quality of the mangal muds for other bottom feeders by mulching the mangrove leaves.
  • Found in Sungei Buloh

Other animals found in SUNGEI BULOH:

  1. Cicadas, brown insects that make the shrill sound heard in Sungei Buloh.
  2. Crabs and shellfish on tree trunks at high tide
  3. Water snakes and horseshoe crabs in shallow streams
  4. Mudskippers across MUDFLATS

What are MUDFLATS??

Mudflats are the areas in front of the mangroves. As the incoming tides flood this area, animals, such as fishes, move in to feed. These animals retreat with the falling tide. Other animals, including snails and sea cucumbers, retreat into burrows as the water level drops, while other such as fiddler crabs, emerge to forage. Some animals such as barnacles, oysters and snails live on the trunks and leaves of the trees. Few species feed directly on the mangrove trees, instead they feed on decomposing leaves and wood.

5. Birds like resident herons and migratory waders.

What are migratory WADERS??

A type of Birds that migrate from their breeding grounds in Siberia and northern Asian countries to warmer regions to escape from harsh weather conditions like winter. Some that had arrived in Sungei Buloh are Common Redshank, Whimbrel, Common Sandpiper and Plovers.They often stay on nutrient-rich Mudflats to feed on during low tide.

6. Birds like Common Greenshank ,Yellow Bittern, Cinnamon Bittern, Common Tailorbird, White-bellied Fish Eagle and White-breasted Water hen, a water bird.

7.Reed-warblers, kingfishers and bee-eaters are also common migrants, among the trees and shrubs surrounding the ponds.

8. Golden web spider, Atlas moths, mud lobsters.

9. Fishes like the Mullet, Archer Fish and Halfbeak .

Monday, June 21, 2010

Other characteristics and adaptations of MANGROVES

Distribution:

Swampy coastal areas of tropical regions of West Africa, Southeast Asia ( Peninsular Malaysia, Singapore), Australia.

Soil : muddy, water-logged, deficient in oxygen ,salty or brackish water.

Climate:
  • High mean annual temperature of 27°C
  • Uniform throughout the year
  • Small annual temperature range: 2 °C
  • Heavy annual rainfall of 1500mm to 3000 mm
  • Conventional rain that is frequent throughout the year
  • No distinct wet or dry season
Mangroves have had to physically adapt their leaves, roots,and their reproductive methods in order to survive in a harsh, dynamic environment of soft, low- oxygen soils and varying salinity( Amount of salt in the water)..

Leaves:
  • Thick and leathery to reduce excessive transpiration
  • tough and evergreen to keep moisture in.

  • Have special glands to secrete salt ( Salt secretors- Eg. Avicennia)

  • Some store in old leaves which will drop off ( Ultrafiltrators)

  • For example: Rhizophora and Sonneratia species.

  • Have drip tips and waxy texture of leaves that remove excess water.

  • turn automatically to reduce the surface area of the leaves exposed to the hot sun,in order to reduce water loss through evaporation.
As mangroves grow in sand or mud that is saturated with water, their ability to exchange gases through their root system is reduced.

Roots:

Thus, as mentioned before, some have:


  • Breathing roots, which is an aerial root system above ground to help roots take in oxygen
  • Pencil- like roots which protrude through mud up to 30 cm
  • For example: Avicennia
  • Knee-like roots that grow upwards and turn downwards into the soil
  • For example: Bruguiera trees

  • Prop roots that grow from trunks, anchor firmly into the muddy ground

  • For example: Rhizophora
  • Roots provide structural support in the soft soils.









Flowers and fruits:
  • Flowers- Colourful to attract insects to pollinate its flowers
  • Fruits germinate on trees (Eg. Rhizophora). When seedling falls, sharp end anchors firmly in mud
  • Buoyant.
  • Float for some time before taking root in some coastal areas ( Eg. Avicennia trees)
  • The tide acts as the dispersal to avoid crowding of young plants

Structure/ layers:

  • 15m tall
  • Trees vary in height from 2- 40 m
  • Average eight: 15m
  • No distinct vertical layering
  • Grow close together and form dense thickets
  • Have a close appearance with little sunlight reaching the forest floor.
Diversity of plant species:
  • Dense and luxuriant, because of the high temperatures and rainfall
  • There are 4 main species:
  • Avicennia
  • Sonneratia
  • Rhizophora
  • Bruguiera
  • Others: Sea hibiscus ,Nipah palm
  • Provide valuable resources:
  1. Food
  2. Medicine
  3. Firewood
  4. Charcoal
  5. Construction materials

Saturday, June 19, 2010

Visit to Sungei Buloh




HI everyone :D. Jie Ying here:D.
These are some of the pictures taken on our trip.
p.s There's 35 pictures in total :D

Monday, June 14, 2010

TROPICAL RAINFORESTS! :D

Tropical rainforests are found in tropical equatorial climate! :D


There are 5 DISTINCT LAYERS in a tropical rainforest:

1. EMERGENT layer
2. CANOPY layer
3. UNDERSTOREY layer
4. SHRUB layer
5. UNDERGROWTH layer

1. EMERGENT LAYER:
For tall trees that are of 30 to 50 m
TALL THICK STRAIGHT TRUNKS! :D
(fat carrot shaped bodies)
CROWNS ABOVE CANOPY! :D

2. CANOPY LAYER:
For trees that are of 15-30 m! :D
INTERLOCKING TREE CROWNS! :D
Presence of epiphytes ,lianas & parasitic plants

3. UNDERSTOREY LAYER:
Trees reach 6-15 m
Narrower, oval-shaped crowns
Grow in gaps where canopy allows light to pass through

4. SHRUB LAYER:
Bush-like, puffy tree saplings reach 5-6m

5. UNDERGROWTH LAYER:
Reaches 0-5 m
thin and skinny plants
Grasses, ferns, mosses & fungi
Sparse undergrowth due to insufficient sunlight

CHARACTERISTICS OF Mangroves:

They are FOUND IN EQUATORIAL & MONSOON CLIMATE .

A mangrove is DIVIDED INTO THREE CATEGORIES:
1. Coastal Zone :D
2.Middle Zone :D
3. Inland Zone:D

1. COASTAL ZONE

TREES HAVE AERIAL OR BREATHING ROOTS! :D
(they breathe from their hair)
HAVE ADAPTED TO GROWING IN SALT WATER! :D
(they live in the sea)
Avicennia and Sonneratia trees are common in this zone.

2. Middle Zone
Rhizophora trees are common in this zone! :D
THEY HAVE PROP ROOTS OR STILT ROOTS! :D
(they breathe through their feet)
(tripod stand-ish!)
MODERATELY TOLERANT TO SALT WATER! :D
(can drink sea water)

3. Inland Zone
LEAST TOLERANT TO SALT WATER! :D
(anti salt! :D )
HAVE KNEE LIKE ROOTS
(they have curly toe hair)
Bruguiera trees grow further inland

Introduction :D

Natural vegetation refers to plants that grow naturally in a place with little or no human interference. Some examples of natural vegetation will be tropical rainforests, mangrove forests and tropical monsoon forests. We will be focusing on MANGROVES.

Mangroves are found mainly in areas experiencing tropical climate (equitorial and monsoon climate) They can be found near swampy coastal areas or river mouths.

One of the mangrove areas in Singapore is Sungei Buloh.

Later in this blog, you are going to explore the characteristics and adaptations of the mangroves. You will also get to know more about the Amazon Rainforests... Enjoy. :)