1 station. This species at this station consistently ranked either first 



2 or second except on one occasion when it dropped to fourth. 



3 On the adjacent slope station we had the same species occurring as 



4 the top dominant on each of the 12 sampling dates. At the slope 



5 station, however, that species accounted for something like 35 percent 



6 of all individuals at the station. 



7 If we compare the dominant species between each of the two canyon 



8 stations and the slope station, we find that there were more dominants 



9 that were shared in common between the coarse sediment station and the 



10 slope, that is of the top 20 dominant species at coarse sediment canyon 



11 station, 13 of those were also dominant at the slope station. 



12 When you make the same comparison for the fine sediment canyon 



13 station, you find that only 4 of the top 20 were shared in common 



14 between the two. 



15 I would like to make the point that it's not so much that we had 



16 entirely different species composition at the different stations, rather 



17 what was happening was that the species were present in both places, but 



18 in very different numbers, very different abundances. 



19 Therefore, what we saw as dominant species at one station were not 



20 dominant at another, although they might be present but in very 



21 different numbers. 



22 Density was also highest at the fine-sediment canyon station, an 



23 average of over 13,000 individuals per square meter as compared to 9,000 



24 or 8,000 individuals per square meter at the other two stations. 



25 Diversity was measured, as I said, using both Shannon-Weiner and 



26 the Robert Rarefaction Method and we got kind of mixed results at this 



27 particular location. Using the Shannon index, the coarse sediment 



28 canyon station had the highest diversity, 5.41, followed by the fine 



29 sediment canyon station and then the slope station had the lowest 



30 diversity of the three. 



31 Using a different method, the Hobert Rarefaction Method, we got 



32 essentially the opposite result. The line labeled station 8 represents 



33 the slope station, and it has a higher diversity than either of the two 



34 canyon stations. 



120 



