Ecosystem Ecology - Ecosystem Ecology o Scale of inquiry...

This preview shows page 1 - 3 out of 5 pages.

Ecosystem Ecology o Scale of inquiry and ecology that focuses the on flow of energy and nutrients through an ecosystem. But what is an ecosystem? Population plus physical environment- all biotic and abiotic things. This can exist at multiple scales – aquarium, pitcher plant, lake, lake network, forest. This concept is at what you choose it to be. – example: black creek ecosystem. Scale of ecosystem is based on us and what we are interested in looking at. One thing to recall is that energy cannot be recycled only nutrients can o Energy begins in the sun, open system  primary to secondary to tertiary to decomposers and then energy can be lost. But there is not flow of energy back to primary producers but there is flow of chemical back to all the things o Ecosystem whole energy budget depends on rates of primary production via photosynthesis. There are some unique systems where primary productivity is based on chemosynthesis o Animals spend energy on cellular respiration metabolism, repairing cells so plants use up the chemical energy as fuel for their own survival so there not unique in being able to carry out their life cycle because they do use their own energy. SO the net energy that is left over it is called NPP (GPP- energy used by plants) o NPP- represents total amount of energy that is available to them by the primary producers. o There are different way to describe primary productivity: measurement of energy per unit time – also derived as weight of biomass added to ecosystem  kg per carbon o Generalized food chain- primary producers eaten by primary consumers eaten by secondary consumers – tertiary and quaternary and at each level there are decomposers and devitorres. The decay processes that the matter and nutrients that were locked up in the body of primaries – through decay processes these are put in the environment again for use o NPP – oceans have low rates of primary productivity but 2/3 of the ocean is present on the earth hence most of the primary productivity does come from the ocean . Tropical wet forest- have high rates. Coral reefs: high rates as well but they are very small in amount hence they don’t really give much to the earth. Oxygen: Ocean and tropical rain forest. Why is there so much variation? Overall Activity is limited by combination by of temperature and availability of water and sunlight. Cold conditions – water is frozen, low sunlight causes primary productivity being low. Desert regions: can be found in tropical areas abut low water availability which is why low NPP is found. Ocean: primary productivity is limited by low concentration of nutrients – light goes 90 meters but in most oceans its only deep depths that you will have nutrient high , the water goes up – high rates of productivity where ocean meets continent. Upwelling zones o Relationship with NPP and climate o Ecosystem with below moisture levels  lowest NPP
o High moisture levels and heat  High NPP o Secondary Production: the growth of a herbivores of primary consumers. The amount of

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture