Chapter 55 Flashcards
Energy is ____ created or destroyed
Never
Mass is ____ created or destroyed
Never
Energy is ___ turned into mass in ecosystems
Never
Mass is ___ turned into energy in ecosystems
Never
Species are assigned to tropic levels based on
Their main source of nutrition and energy
Primary producers synthesize organic molecules via the process of
Photosynthesis
Herbivores
Plants and primary producers
Primary consumers
Carnivores that eat herbivores
Secondary consumers
Carnivores that eat carnivores
Tertiary consumers
Organisms that get their energy from non living organic matter are
Detritivores
The amount of light energy converted to chemical energy in the form of organic compounds by autotrophs durning a given time period
Primary production
= to gross primary production - the energy used by the primary producers for their autotrophic respiration
Net primary production (npp)
Why is npp typically the key measurement of production?
It represents the storage of chemical emergent that will be available to consumers in the ecosystem
What units are used to express npp?
Energy per unit area per unit time
Biomass added per unit area per unit time
Where do we find especially high npp?
Estuaries and coral reefs
How do we know if a nutrient is a limiting nutrient?
If you add more the growth will increase if limiting
Plants would grow more if they had more of this nutrient
Limiting nutrient
Eutrophication occurs when ___ is added to lakes, causing growth in ___ which ultimately reduces ___ concentrations
Nutrients
Algae
O2
As big as a lake or forest or as small as under a log
Ecosystem
Globally, terrestrial npp is mainly controlled by ____ and ___
Temp
Moisture
On land, the nutrient that most often limits plant growth is
Nitrogen
Often limiting in old, highly weathered soils
Phosphorus
The amount of chemical energy in consumers good that is converted to their own new biomass during a given period
Secondary production
Production efficiency represents the energy in an organisms food that is not used for
Respiration
