Sandy beach methods and protocols for wrack consumers
The abundance, biomass and population characteristics of wrack consumers, primarily
the talitrid amphipod Megalorchestia
spp. were estimated using uniformly spaced core sampling protocols.
was conducted along the three vertical format (shore-normal) transects also used for physical
measurements and macrophyte wrack sampling.
Intertidal beach transects extended from the lower edge of terrestrial
vegetation or the bluff to the lowest level exposed by swash. We collected a
series of 10 uniformly spaced cores from the upper edge of talitrid burrows to the lowest
level where talitrids were burrowed.
Cores were pooled and placed in a mesh bag with an aperture
of 1.5 mm and sieved. Animals retained on the sieve were
placed in labeled plastic bags, chilled and transported to the laboratory for processing.
All retained coarse sediments in sieves were placed in the sample bags to
retain the highly active taxa.
In the laboratory, all macroinvertebrate species were
identified, enumerated, blotted dry and weighed to the nearest 0.001g.