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Swath surveys

Swath surveys. Linking Swath to UPC. Species, Substrate, Relief. 10 points. 10 points. 10 points. 10 points. 10 points. 10 points. counts. counts. counts. counts. counts. counts. Section 1. Section 2. Section 3. Section 4. Section 5. Section 6. Example. More.

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Swath surveys

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  1. Swath surveys

  2. Linking Swath to UPC Species, Substrate, Relief 10 points 10 points 10 points 10 points 10 points 10 points counts counts counts counts counts counts Section 1 Section 2 Section 3 Section 4 Section 5 Section 6

  3. Example More

  4. Analytical approach

  5. 1. Set up a raw data matrix Species 1 2 3 4 5 etc. Transect/Section S110, 1 54 0 0 5 0 S110, 2 37 1 0 4 0 S110,3 68 2 0 2 0 S110, 4 60 0 0 0 1 S110, 5 47 0 0 2 0 S110, 6 60 0 0 0 0 etc.

  6. 2. Calculate a dissimilarity (Bray-Curtis) matrix S110,1 S110,2 S110,3 S110,4 S110,5 S110,6 etc. S110,1 .000 S110,2 .203 .000 S110,3 .666 .652 .000 S110,4 .216 .331 .759 .000 S110,5 .328 .410 .796 .191 .000 S110,6 .336 .432 .796 .183 .054 .000 etc.

  7. Linking biological communities to other communities or environmental variables • Are differences in species composition related to differences in other communities or to associated environmental variables?

  8. BIO-ENV procedure Samples Similarity/Dissimilarity matrix Bray-Curtis Species abundances Rank correlation - Spearman - Weighted Spearman Euclidean Env variables Subsets of variables

  9. UPC Species Matrix Swath Matrix = UPC Habitat Matrix Cable distance, section 110, 1 vs 110, 2

  10. Dissimilarity ? Swath Species Dissimilarity Habitat dissimilarity

  11. Prediction Swath Species Dissimilarity Habitat dissimilarity UPC species dissimilarity Null Hypothesis Swath Species Dissimilarity Habitat dissimilarity UPC species dissimilarity

  12. If there is a match • Look at specific species to determine if associations make sense • For example: is Macrocysitis found in sandy habitats • Species selected • Marcrocystis and Cystoseira • Balanus nubilus and Styela • Cryptochiton and Lithopoma • Patiria and Pisaster giganteus

  13. Questions to be addressed • Is there an association between Swath species composition and (1) UPC species composition and/or (2) habitat attributes? • This needs to be motivated in intro and discussed in discussion. Why would we be interested in this question? Why is it important? What would you predict? • Do the associations differ in relative strength? • This needs to be motivated in intro and discussed in discussion. What is the essential question here? Is there a basis for a prediction? • For select species are there a set of strong associations/dis-associations and do these make sense? • This needs to be motivated in intro and discussed in discussion. Can you make predictions? Why would we care about this?

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