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Block Rock Monitoring site	Good place to monitor Limpets
	Rock face is nearly perpendicular and goes from upper to mid intertidal

Both easy to access and perpendicular so variation can be attributed to tidal height

There are series of drill holes (see the X in image below) which can be numbered and are often used by limpets as ‘home site’ – see below

	Clusters of Semibalanus
	The only algae that survive on this rock face are associated with the Semibalanus barnacle patches (# 1-4). Not visible at this level is around each of the ‘patches’ the area is kept clean of smaller barnacles (as below the 3)– either by the ‘whisking’ of attached algae or some herbivore living in the patch

Slowly falling away

	‘Block Rock’ is at the yellow line below. Where the X is looks like different biota from 2003 (slightly different angle – use □ to compare w 2003)

Created by LG on 4/6/2004

Last updated on Monday, May 17, 2004