State of the Bay Report 2010-Final - Anchor Environmental

cover data for both mobile and sessile organisms were combined and down-scaled to 100%. This
survey protocol is consistent with the previous survey protocols.
Sampling is non-destructive, i.e. the biota is not removed from the shore, and smaller
infaunal species (e.g. polychaetes, amphipods, isopods) that live in the complex matrix of mussel
beds or dense stands of algae are thus not recorded in this survey protocol. Additionally, some algae
and invertebrates cannot be easily identified to generic or species level in the field and are thus
recorded under a general heading only (e.g. crustose and articulate corallines, red turfs, sponge,
colonial ascidian).
For further analysis, intertidal species were categorized into ten functional groups: a)
grazers, mostly limpet species, b) trappers, limpet species that specifically trap kelp fronds beneath
their shells, c) filter-feeders, particularly sessile suspension feeders such as mussels and barnacles, d)
mobile predators and scavengers, such as carnivorous whelks, e) anemones, f) crustose and g)
articulated coralline algae, h) corticated and i) ephemeral foliose seaweeds and j) kelps.
Dive School
Schaapen Island East
State of the Bay 2010: Saldanha Bay and Langebaan Lagoon 193
Jetty
Schaapen Island West
Figure 9.2. The rocky shore study sites in 2009 from top right to left bottom: Dive School, Jetty, Schaapen
Island East, and Schaapen Island West.