Species Densities

Site - One of 6 sites

Year - 2005 or 2006

Season - Summer or Winter

SurveyType - Either "Quads_All_Species" or "Quads_Large_&_Rare_species_only" - Whether all species were counted (= Transects 1 and 2), or only large and rare species were counted (= Transect 3).

TideZone - Subjectively assessed placement into the mid- or high- tide zone.

Transect - 1st, 2nd, or 3rd; each haphazardly placed parallel to the shore at each tide zone within pre-defined areas of the shore (the same in which feeding surveys were conducted). [NOTE: Although I recorded the information in my notebooks, I did not have the forethought to enter the area in which each transect was located. I would need to go back to my notebooks in order to match a transect with the location of each feeding survey.]

Quad - Five 0.25m^2 quadrats placed randomly along each transect.

Species - Name of the species observed

Density - Number of individuals per square meter. NOTE: (1) Mobile species were counted directly. Sessile species were estimated by percent cover subsequently converted to counts using species-specific conversion rates obtained from an independent set of smaller quadrats in which sessile species were both counted and estimated by percent cover. (2) Densities were also corrected for the actual surface area of the rock below the quadrat. That is, due to the rugosity of the rock, the actual surface area was greater than 0.25m2.