1 / 12

Ecosystem

Ecosystem. All biotic + abiotic features of an area. Biotic : living organisms Abiotic : non-living features Through ecosystems, we study energy flow and nutrient/chemical cycling. Ecosystem Production. Primary production : amount of light energy converted to chemical energy.

agnes
Télécharger la présentation

Ecosystem

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ecosystem All biotic + abiotic features of an area.Biotic: living organisms Abiotic: non-living features Through ecosystems, we study energy flow and nutrient/chemical cycling.

  2. Ecosystem Production • Primary production: amount of light energy converted to chemical energy. • Trophic efficiency: amount of production transferred from one level to the next.

  3. Energy is lost through respiration and waste

  4. Food Webs are short • Constrained by inefficient transfer of energy between trophic levels (~10%/level). Predict: Areas with greater productivity should have… • Shorter webs are more stable. Predict: More variable environments should have…

  5. How are trophic levels regulated? (meaning, why isn’t the whole earth covered in rabbits?) Top-down regulation? Bottom-up regulation? (Can you describe how each of these might work?)

  6. Community Group of actually or potentially interacting species living in the same place.

  7. How do communities form? • Assemblage of species based on similar abiotic needs? Prediction: • Interdependent species clustering together? Prediction(s):

  8. Measuring Biodiversity Species diversity measures the number of species (richness) and number of individuals/species (abundance) in a community.

  9. Hot topic: What’s the link between biodiversity, productivity, and stability? • invasion • disease

  10. Detritus: non-living organic material (e.g. dead organisms, feces, molts, etc) Detritivores: • linked to all levels of trophic structure • good measure of ecosystem activity (e.g. energy flow, chemical recycling) Difference between Detritivores and Decomposers?

  11. Carbon, Phosphorus, Nitrogen and energy are all cycled through ecosystems in similar pathways.

More Related