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Prince Rupert Regional Information
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NATURESea, land, river PEOPLESCommunity ‘Progress Report’ on
settlement / growth
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Selection for
photographing was haphazard – as only wanting to see how much the ‘settlers’
had grown in last month From image left
can see there are lots of small barnacles present The ‘1’ is
beside a predatory snail – with close up (maybe) in image below
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Lots of Life here |
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At
this growth/ development stage appears to be 2 different species of Barnacles
B1 (Balanus glandula) and B2 (Semibalanus sp) B.
glandula has diagnostic M --- while Semibalanus too immature yet Note
what appears to be at least 3 different settlements (sizes) thus A-c |
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The
picture was taken originally to capture the juvenile Fucus plants – the
predatory snail is attacking a mature Balanus glandula --- note too the
‘empty’ barnacle shells throughout the image (Bxx)
--- as this was not evident in all the photos, I will have to see if these
mortalities are chance or predictable (upper intertidal for example) Note
too that I interpret image as saying that 3 different species of juvenile
limpets are present (M2, M3, and M4) |
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Periwinkles
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The
three different size groups (at least) is evident in this image – Presumably
as in the case of the different sized Barnacles the different sizes mean at least
3-4 different settlings for Barnacles/ Periwinkles (Littorina scutulata) from
the plankton |
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Questions
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Looks
like area has lots of recruitment from the plankton—but not evident what all those
herbivores will have to eat for survival --- nor is it evident to what extent
the barnacles’ ‘empty shells’ is localized or spread throughout |
Created by LG on 18/8/2007
Last updated on Saturday, August 18, 2007