WORLD BIOMES

This page archived August 2008

A BIOME is defined by the Longman Geography Handbook as:

" an ecosystem that covers a large area of the earth's surface - land or water. It may be recognised as a formation-type (a large area of world vegetation with the same dominant life-form throughout), together with the other organisms that live in the foundation-type"

Basically then, deserts, tropical rainforests, temperate forests, Mediterranean garrigue, tundra etc are all biomes. They are generally controlled by the climate of the region, but within that broad definition, all levels of inter-relationships develop. Each climate will also develop its own climax vegetation. This page contains information on TROPICAL RAIN FORESTS and DESERTS. There are obviously many other biomes, and I may well add those as time goes on.

LESSON PLANS are further down the page.

TROPICAL RAIN FORESTS

CLICK HERE TO GO TO YEAR 9 RAINFOREST PROJECT DETAILS

This is being replaced by Assessment for Learning based resource.

There is a huge amount of material on this biome on the Internet, and the problem is finding material at an appropriate level for your particular project or lesson. All of the links below would have relevant material for Key Stage 3 or higher.

Rainforests cover 2% of the earth's surface, or 6% of its landmass. They house over half the earth's plant and animal species. They originally covered twice the area they cover today.

Thanks to Evelyn Lynch for pointing out in April 2009 that I had a dead link, and suggesting this replacement instead: http://qanda.encyclopedia.com/question/rainforest-141384.html

A wonderful resource from GEM looking at environmental problems in tropical forests, but other forests too. This is a great site for research.http://qanda.encyclopedia.com/question/rainforest-141384.html

MAHOGANY is now getting very rare due to over-extraction. There are several species of Mahogany: the trees can reach up to 50m in height, with a trunk 12m in circumference. It has a deep dark glow. Exportation of mahogany has been banned in Brazil since October 2001.

The forest can grow back to a certain extent, producing secondary forest. This is because seeds from trees will quickly move to colonise any gap in the canopy. However, this can only work when the area of forest that has been cleared is a small area and is surrounded by other areas of forest. Think of an analogy of a wound. A small cut will generally scab over and heal fairly quickly, but if you chopped your arm off it wouldn't grow back...unless you're a starfish, in which case "gloop gloop glopp gleep". The Deep Jungle series showed some of the symbiotic relationships which develop.

There are creatures that have adapted in very specific ways, and as a result they don't cope well with change. Some creatures adapt using MIMICRY: they grow to  look like other creatures or items e.g. caterpillars that look like bird droppings to avoid being eaten.

Plant adaptations:

- slippery bark, or bark that peels off very easily, so that vines and lianas can't get a grip to cover them

- some plants develop poisonous secretions

Some animals develop specific food supplies e.g. caterpillars that feed only on algae which grows on the fur of sloths - this is a symbiotic relationship.

Sustainable development is not perhaps about merely preserving the forest as it is. It has to be productive, and to provide a living for people into the future.

One main problem in the AMAZON are FIRES. This PLANET ARK article describes a large fire in March 2003 in the Barcelos region of Amazon.

In 2005, a programme called DEEP JUNGLE was broadcast. There is a page on the ITV website which will be there until some time in the future (have a look, it may still be there). This has 3 PDF factsheets which are well worth downloading. Recommended.

DESERTS

The huge diurnal temperature range in deserts produces problems for anything living in them: plants, animals or people. They also cause the rocks themselves to break apart and weather - exfoliation results in sudden explosions which sound like gunshots across the silent desert sands...

Ray Mears, as mentioned earlier, produced an excellent program on how to survive in desert environments which gives an excellent picture of the problems facing the indigenous peoples, and anyone whose 4x4 runs out of diesel. Not that you're likely to find yourself in that situation in a hurry...

We also use an adaptation of an old NASA survival game. Participants have to decide what are going to be the most useful items. Also a programme from the 'Landmarks' series looking at the Tuareg. The game's copyright is owned by HUMAN SYNERGISTICS, so it has been removed from the site.

LESSON PLANS

1. Investigating rainforest loss using Excel (External link) - thanks to Noel Jenkins for this material

2. What can you do to save the rainforest ? Some IDEAS here. (External link)

3. CLICK HERE TO GO TO YEAR 9 RAINFOREST PROJECT DETAILS

4. YEAR 13 RESEARCH TASK

5. A useful web posting by Danny O Callaghan on Soya and rainforest devastation

http://kingdowngeogblog.blogspot.com/2007/04/asphalt-jungle-br-163.html

 

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