1 The first thing I heard was topography, which I just showed in the 



2 previous schematic, but also, the roughness in the substrates which are 



3 in the features, Barbara and Dick and Page talked about the different 



4 physiographic environments in terms of rough substrates, soft 



5 substrates, cliffs, et cetera, which make the canyons unique for 



6 biological communities. 



7 Both Bob and I talked about the current structures within canyons 



8 in that they are decoupled from the shelf and that in many canyons, they 



9 are much stronger than on the adjacent shelf or slope at comparable 



10 depths. 



11 That leads to the third point, that we see extensive resuspension. 



12 At least in some of the major canyons that we have looked at, the 



13 resuspension activity at the bottom of the axis is much stronger than on 



14 the adjacent slope, and that has implications for pollutant scavenging 



15 and for the geochemistry of the canyons. 



16 Barbara showed some nice pictures of the species. Just as another 



17 little comment on the report, it would be nice to try to say what 



18 canyons we know this about and what canyons we don't know this about, 



19 how general these statements are or do we only know them about one or 



20 two canyons. 



21 Barbara showed some nice pictures of the species, the diversity of 



22 species density, comparing slope versus canyon environments. I think it 



23 would be nice to also try to summarize the species composition between 



24 slope and density. I think Nancy can also address that. 



25 Dick made a very useful point, I think, in that the canyons are 



26 unique in that they are fished. There are topographic features in which 



27 we have-- 



28 DR. TEAL: Not trawled. 



29 DR. BUTMAN: Not trawled. I will get my pen and change that. 



30 There are a number of us who presented information on the texture, 



31 showing that the texture is very different, sufficient sediment texture 



32 is very different from the adjacent slope. 



176 



