1 / 23

Ecological Niche Modeling : practical

Ecological Niche Modeling : practical. July 3 rd , 2014 Charlotte Germain-Aubrey cgermain@ufl.edu. Look at a set of conditions under which a species occurs naturally (presence data ) When possible, also look at conditions under which the species does NOT occur ( absence data )

mieko
Download Presentation

Ecological Niche Modeling : practical

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. Ecological Niche Modeling: practical July 3rd, 2014 Charlotte Germain-Aubrey cgermain@ufl.edu

  2. Look at a set of conditions under which a species occurs naturally (presence data) • When possible, also look at conditions under which the species does NOT occur (absence data) • BUILD THE MODEL • Apply the model in space (around where it occurs naturally, or in another area), or in time (where did it use to occur, or where will it occur in the future) • PROJECT THE MODEL Occurrence data: where the species is present, but not where it is absent Distribution map: where the species is absent, but not where it is present Ecological niche models

  3. Step 1: gather points Occurrence points Specimens from museum Observation points Distribution map (absence map) http://scienceasaverb.wordpress.com/2010/10/29/introduction-to-ecological-niche-modeling-environmental-niche-modeling-species-distribution-modeling-part-two-what-is-niche-modeling/

  4. Step 2: gather environmental data Climatic Geological Soil Water Chemicals Species interaction positive: obligate host negative: excluding competitor http://scienceasaverb.wordpress.com/2010/10/29/introduction-to-ecological-niche-modeling-environmental-niche-modeling-species-distribution-modeling-part-two-what-is-niche-modeling/

  5. Step 3: Extract environmental values at points of occurrence http://scienceasaverb.wordpress.com/2010/10/29/introduction-to-ecological-niche-modeling-environmental-niche-modeling-species-distribution-modeling-part-two-what-is-niche-modeling/

  6. Step 4: Build a model Here, a very simple model: 95% of the species distribution for each environmental variable http://scienceasaverb.wordpress.com/2010/10/29/introduction-to-ecological-niche-modeling-environmental-niche-modeling-species-distribution-modeling-part-two-what-is-niche-modeling/

  7. Step 4: Build a model Here, a machine learning model comparing the presence and absence MaxEnt http://scienceasaverb.wordpress.com/2010/10/29/introduction-to-ecological-niche-modeling-environmental-niche-modeling-species-distribution-modeling-part-two-what-is-niche-modeling/

  8. Step 5: project the model Here projection in the space and time of occurrence http://scienceasaverb.wordpress.com/2010/10/29/introduction-to-ecological-niche-modeling-environmental-niche-modeling-species-distribution-modeling-part-two-what-is-niche-modeling/

  9. Step 5: project the model Here, a projection into a new area

  10. http://www.oceanecology.ca/species_model_data.jpg

  11. Maximum Entropy algorithm used (machine-learning) to build and project niche models. 25% of dataset set aside for testing the model and giving feedback on how well it performs (machine learning process) Maxent

  12. species,longitude,latitude bradypus_variegatus,-65.4,-10.3833 bradypus_variegatus,-65.3833,-10.3833 bradypus_variegatus,-65.1333,-16.8

  13. What is your question ? Where is your data ?

More Related