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Season Change	Sun goes south
	The tides change with higher high during days for next 6 months

Our Mixed semi-diurnal tides with 2 unequal highs & 2 lows per day means ‘new habitat’ becomes available during winter – in summer the upper intertidal is ‘burned off’ by strong sunlight – while in winter it will be covered by water during most daylight hours --- allowing many life forms to flourish even during winter’s cold short days

Here is K-12 site on Tides by NOAA;

Here is a UBC math view of tides

	North Coast’s tides
	Combining large tides and mixed diurnal means that Rupert area has more intertidal area – and more extreme variation on daily scale than other areas in BC Yellow = desert in summer while same area green when tides ‘flip’ in fall – winter

By February upper recolonized by algae and periwinkles	Maximum coverage in early April

As shown below, only a few patches of Prasiola remain ‘visible’ as under the ‘p’ on image to right – taken early October --- I say ‘visible; because even in early October some areas are turning green (below right as ????)– which implies to me that dormant cells have remained over the summer – time will tell if this is Prasiola	Only to be ‘burned off’ again by summer sun

	East side of above

Created by LG on Oct/15/2005

Last updated on Monday, October 17, 2005