ODWS icon

The Open Door Web Site
HOMEPAGE CHEMISTRY PHYSICS ELECTRONICS HISTORY HISTORY OF SCI & TECH MATH STUDIES LEARNING FRENCH STUDY GUIDE  PHOTO GALLERY
BIOLOGY HOMEPAGE  IB BIOLOGY WEB TOPIC CHAPTERS FACTS & FIGURES LABORATORY WORK QUESTIONS & QUIZZES ECOLOGY CLUB PLAYS

 

Part XXII: The Interdependence of Living Things : The Ecosystem : An Interacting Community IndexEcosystem Homepage
Food Chains
Energy in the food chain
Food webs
Competition Between Organisms
The Missing Link and the Control of Nature
Ecosystem example : The Rocky Shore
Ecosystem example : Milkweed : A Micro-habitat
Chapter Summary (useful for revision)
Questions relating to this chapter

Topic Chapters Index

 

Rain forest, Costa Rica  © Shirley Burchill

Rain forest, Costa Rica

THE ECOSYSTEM: AN INTER-ACTING COMMUNITY

Custom Search

The Rainforest Canopy

 

Rain forest, Costa Rica  © Shirley Burchill

Rain forest, Costa Rica

 

The canopy of a forest is formed by the spreading branches of the trees as they meet each other above the ground. In the tropical rain forests of Costa Rica the canopy can be divided into three layers. In the lower canopy the trees are between 10 metres and 25 metres above the ground. The trees in the middle layer of the canopy are 35 metres above the ground and the tallest trees are over 50 metres in height. Because of the dense canopy vegetation, the forest field layer receives only 1% of the sunlight which falls on the canopy.

The plants in the canopy, such as the balsa tree, need to grow as tall as they can to receive the maximum amount of sunlight. What they gain in height, they lose in strength. The trunk and the branches of the balsa tree are light, thin and can be easily broken.

Every year about 210000km2 of tropical rainforest is chopped down to make way for farmland and pastureland. At this rate most of the tropical rain forests will have disappeared in the next 50 years. This means that half of the world's animal and plant species which exist will be extinct by the year 2100.

 

The Open Door Web Site is non-profit making. Your donations help towards the cost of maintaining this free service on-line.

Donate to the Open Door Web Site using PayPal

SITE MAP
WHAT'S NEW?
ABOUT

PRIVACY

COPYRIGHT

SPONSORSHIP

DONATIONS

ADVERTISING

© The Open Door Team 2018
Any questions or problems regarding this site should be addressed to the webmaster

© Paul Billiet and Shirley Burchill 2018

Hosted By
Web Hosting by HostCentric


SiteLock