Transcript Power Point Presentation

(picture from http://search:corbis.com)
Sweden’s biomes
(pictures from Sveriges nationalparker, Bokforlaget Prisma 1983)
Natural disaster that
•regulate population size
•Increase biodiversity
•Is caused by lightning strikes
Modern firefighting
(pictures from http://search.corbis.com)
Succession after a fire in a coniferforest
• Fire
•
Flourishing seeds and roots
• pH less acidic
• Fungi and bacteria
• Insects
• Deciduous trees
(picture from http://search.corbis.com)
20 years later
• Unique insects fly away
• Conifer trees starts to compete
• Moldering trees attracts insects
• Perfect environment for woodpeckers
•After 60-70 years conifer trees dominate
Four important factors
for the survival of populations
•Ability to spread
• Distance to the nearest area where the specie occur
• The greatness of the area
• The quality of the area
The Dendrocopos leucotos
A woodpecker soon to be extinct in Sweden
(pictures from L.Johnssons:Foglar I Europa 1992)
“Natural” fires is still the best way
to preserve the endangered species
(picture from http://search.corbis.com)