plant/animal reference) to get a bigger picture
Shore crab with clam |
Pete verifying critter |
Cobbled shoreline |
A great day for doing intertidal bio-monitoring! Sunny, beautiful and a low tide of -1.7 at 12:33 PM, Beach Watchers arrived at 10:30 AM near the south end of Camano Is to one of our more unique settings, hosted by Derek W. This beach monitoring line begins immediately at the base of a high bluff area with several homes tucked in to its edge. The line going out marches through dense cobbles, to sands and cobbles, and finally to just sand. At the shore edge there is a lot of green seaweed, but this year, not very many of the expected low intertidal species. Getting to the low shore, one goes through areas of active clams, many crabs, large numbers of limpets and snails, and lines of seaweeds and mussels all intertwined.
This year, there were fewer species found among the rocks, but the barnacles were dense in some areas. And many periwinkles were found in apparent colonies of new, tiny ones; these included the Littorina scutulata and the Littorina sitkana. In 2008 we saw many sea stars, but this year we found only a few small ones and only in the last few sections we found many anemones but almost all were closed up and thus un-identifiable. A total of 32 species were found; the numbers of Barnacle-eating nudibranch (Onchidoris bilamellata) were many and their eggs coated huge areas.
Recent slide |
End of the line |
Onchidoris bilamellata |
Onchidoris eggs |
Nudibranchs & eggs |
A recent hill slide occurred here and it is interesting to ponder its impact on this area. Located just north of our start line, its rock and soils should have drifted northward, away from the monitoring line. Pictures were taken to record these changes. Afterwards the group gathered at the picnic table of our host to relax and enjoy their gardens which thrive at sea level. Thanks to all who came for the monitoring and to our gracious hosts.
Pictures by J. Custer and J. McDougall and G. Pence; article by Judi
