Interdependence- Living Environment Flashcards
(22 cards)
Characteristics of a climax community
Stable community, high biodiversity, complex food webs, high biomass
Types of secession
Primary and secondary
True or false
Secondary succession occurs in areas that have never been colonised before
False
What is Gross Primary Productivity GPP
The rate at which autotrophs produce biomass in a given area and time period
How much of the GPP is used by plants for their own respiration?
Approx half
What is the remaining GPP available for?
2
Either:
Stored or utilised by plants for ✨new✨ biomass production
Available for consumption by autotrophs
What does GPP stand for
Gross primary productivity
Are plants autotrophs or heterotrophs
Autotrophs
How can we work out Net Primary Productivity NPP?
The GPP - respiration
What does NPP standard for?
Net Primary Productivity
What is GPP - respiration
NPP
What is secondary productivity?
Definition time
The assimilation of food into new biomass through the transfer of organic material between trophic levels.
What do we call the % of biomass produced by one trophic level that is transferred and incorporated into the biomass of the next trophic level?
Ecological efficiency
Average ecological efficiency
10%
How is energy lost from a food chain?
Heat and indigestible waste
An average ecological efficiency of 10% does what usually to a food chain?
Limit it to 4 or 5 links
True or false
Ectotherms rely on the external environment for their temp control
True
Endotherms or ectotherms use internally generated heat to maintain body temp despite external temp changes
Endotherms
What has a high metabolic demand to maintain body temp
Endotherms
What do endotherms mean for food chains
Less energy for biomass accumulation
Are ectotherms more ecological efficient than endotherms?
Yes
Endotherms have longer food chains than ectotherms, true of false
False
