BIOL1003 Lecture Notes - Lecture 20: Bioaccumulation, Biomagnification, Mercery
Biotic influences
Use of resources
What an organism does with available resources determined productivity, and
therefore abundance
Use of energy
Chemotrophs- may have been the first life on earth- primary consumer but doesn’t
require sunlight- converts chemicals
Radiotrophs- use radioactive substances to transform glucose into useable energy
Thermophiles- organisms which can withstand very extreme high temperatures,
some oxidise HS and FeS in their cells to gain energy
Energy transfer
Photosynthesis
oH2O + CO2 glucose + O2
Cellular respiration
oGlucose + O2 H2O + CO2 + ATP
The availability of biochemical energy (ATP) depends on air (O2, CO2), water (H2O)
and sunlight
Primary production
On land, water and temperature are the main limits to production
In deep aquatic environments, access to sunlight and dissolved chemicals
Net production= gross production– respiration
Productivity is a measure of ecosystems
Trophic levels:
food chains
Roughly
natural
maximum
of 5
organisms
in a food
chain
because a
lot of
energy is
lost during the way through homeostasis, movement,
activities, metabolism
Trophic levels: food webs
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
What an organism does with available resources determined productivity, and therefore abundance. Chemotrophs- may have been the first life on earth- primary consumer but doesn"t require sunlight- converts chemicals. Radiotrophs- use radioactive substances to transform glucose into useable energy. Thermophiles- organisms which can withstand very extreme high temperatures, some oxidise hs and fes in their cells to gain energy. Photosynthesis: h2o + co2 glucose + o2. Cellular respiration: glucose + o2 h2o + co2 + atp. The availability of biochemical energy (atp) depends on air (o2, co2), water (h2o) and sunlight. On land, water and temperature are the main limits to production. In deep aquatic environments, access to sunlight and dissolved chemicals. Roughly natural maximum of 5 organisms in a food chain because a lot of energy is lost during the way through homeostasis, movement, activities, metabolism. Photoproducers at bottom- using light to produce usable energy.
