I remember writing these notes in Y12, I know first hand the amount of time that has to be invested into this subject and how difficult it can be to identify the key information. These notes are time savers, giving you more time to practice questions and past papers. The notes used for all my A-lev...
Whatis ecology
What is anecosystem
Ecosystems consistoe a network of habitats and the communities oforganismsassociated
to them
Habitat Placewhere an organismlives
Microhabitat Smallpartof a habitat
Population Groupoforganisms of the samespeciesliving and breedingtogether
Community Populations oe all the different species of organismslivingin a habitat
Niche role oe an organismin a community
Bioticfactors Livingfactors affecting the ability of an organismto survive
Abiotic factors Non living elements of the habitat of an organism
Biosphere largestecosystemin earth divided into smaller partscalled biomes
, Conserving globalbiodiversity
the nature of extinction
Extinctionis the permanent loss ce all membersoe a species
Extinction can belocalised onlyin an area or total lost from Earth
Speciesbecome extinct becausesomethingchanges in their habitat
Criticallyendangered Extremelyhighrisk of extinction in the wild
Endangered Veryhighrisk ofextinctionin the wild
Vulnerable Highrisk oeextinction in the wild
Conservation measures such as habitatprotectionmay remove the threat of extinction
conservingbiodiversity
CITES Conventionof InternationalTradein Endangeredspecies at wild fauna and Elora
CITESis an internationalagreementdesigned to protectendangered animals andplants
in both the livingorganismsand products made from them
byregulating traderules
It statesstrict aboutimportand exportsoe these
Appendixs organismsthreatenedwithextinctionand no
trade in wild collectedspecimens or theirproductsisallowed
AppendixH Not yet threatened byextinction but are
endangered and couldbecome extinct it not protected
Organisms from Appendixt that are bred incaptivity
are treated as appendix ll allowing them to be
traded or international breeding programmes
Appendix II Onecountry has asked another CITES
members to help protect a local population
organisms may be threatened locally but not
globally
Limitations to CITES
CITESdealsexclusively with trade agreements It does not protectecosystems or attemp
to legislate or protectionof breeding areas or threatened habitats
Many countries have not signed up to cites
Strongcomercialinterests can override scientificevidence or the need of
protection
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