Foodweb and ecoteoxicology

arrow that is the inpus, box that is the system, arrow that is the output, can have more box and arrow models inside the box can be diff spheres are animals

when pollutants or things build up in the food chain The build up of chem in org thorugh both bio conct and active inputs Takes into account the breathing and also what you are eating The active accumulation is when the things eat other things with their own BCF bioaccFactor (BAF)= C(in organism from all sources)/C(env)

arbitrarily delineated system/entity that has input and outputs

Biomass, which groups are the greatest in size Relationships – which parts consume other part Energy flow – what was lost what was gained where

absorption, eating, water?

made up of arrows and nodes nodes - animals, subcompartments in the web

Foodweb is a collection of food chains animals can be part of different food chains in the save foodweb

Bottom are primary producers Fed on by primary consumers then secondary consumers

10% of energy transfer up to the next level, energy is divided by 10 energy efficiency increases as you go down number of individuals increase as you go down, has more biomass

The steady state concentration in a lake Results from passive absorption of chemical Fish breaths in water but is also absorbing toxins in env Some of it gets excreted

concentration factor of chemical in an org is usually the same as the env if org is small BCF = C(in org passively)/C(env) C(env) - steady state concentration

Steady state conct - the amount of chem that remains constant within a syst when all input and output are accounted for. Is based on resident time. equal to the C(env) Resident tim - resident time - how much time it takes for particle to leave system. Resident time = System vol/syst flow

Biocont - only looks chem concentration from passive bioaccumulation - accounts for passive and active biomag - uses bioaccumulation and compares them of different animals

Relative inc of chem in tissues of org as you go up takes into account bioconcentration and bioaccumulation. Biomagnification factor = BAF (pred)/BAF(prey)