11 – To Evaluate Primary or Secondary Data Relating to the Effects of Human Activity on Species Diversity (LC 2027) (Leaving Cert Biology): Flashcards
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Primary data in biodiversity research
Primary data in biodiversity research
Data collected directly through research
Secondary data in biodiversity research
Secondary data in biodiversity research
Information from existing studies and databases
IUCN Red List purpose
IUCN Red List purpose
Standardised system for evaluating species conservation status
Species group with highest proportion of threatened species
Species group with highest proportion of threatened species
Cycads (ancient seed plants)
Natural/background extinction rate (per million species/year)
Natural/background extinction rate (per million species/year)
0.1 to 2 extinctions
Current extinction rate (per million species/year)
Current extinction rate (per million species/year)
~34 extinctions
Amphibian cumulative extinction % by 2018
Amphibian cumulative extinction % by 2018
~2.3%
When did most dramatic extinction rate increases occur?
When did most dramatic extinction rate increases occur?
After 1900
Number of confirmed extinctions (past 500 years)
Number of confirmed extinctions (past 500 years)
At least 680
How many times higher: current vs natural extinction rates?
How many times higher: current vs natural extinction rates?
17-34 times
% of Earth's ice-free surface affected by human activities
% of Earth's ice-free surface affected by human activities
Over 70%
% of ice-free surface used for grazing land
% of ice-free surface used for grazing land
~37%
Examples of confined wilderness areas
Examples of confined wilderness areas
Arctic, Amazon Rainforest, Sahara Desert, Australian interior
Term for current human-driven biodiversity crisis
Term for current human-driven biodiversity crisis
Sixth mass extinction
% ice-free land: infrastructure & intensively managed areas
% ice-free land: infrastructure & intensively managed areas
More than half