ecosystems and biomass

6.3.1 ab

examples of biotic factors in a rock pool

competition for food and space

examples of abiotic factors in a rock pool

salinity/pH of water: change when water evaporates

temperature/light intensity: less water means more heat/light intensity

examples of biotic factors in a playing field

producers: attract herbivores, food availability, competition for space

examples of abiotic factors in a playing field

water availability: too much water can wash nutrients away and decrease O2 availability in soil meaning bacteria cannot respire

examples of biotic factors in a large tree

herbivores eat the leaves so less SA to catch light to photosynthesise, these herbivores could be eaten by predators so more leaves

examples of abiotic factors in a large tree

light intensity inside/around is low, limited nutrients and water as the tree takes most of it

what is biomass

mass of living material of the organism/tissue

how do we measure biomass

dry mass, make by dehydrating organism and then weigh as majority of mass could be water

how much biomass is transferred from organism to organism

100% - 60 not taken in, 40 taken in as gross productivity, 30 lost via respiration, 10 actually taken in as net productivity

how do we calculate efficiency of biomass transfer

efficiency = biomass transferred/biomass intake * 100

how can humans manipulate transfer of biomass

restrict movement, eat higher energy foods, stay indoors, remove competition/predators