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e-princerupert.com |
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NorthCoast's Regional Information
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NATURESea, land, river PEOPLESCommunity
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these are
from shore transct – one on right is almost subtidal while one in middle is
upper intertidal – Number 2 shows why called ‘pop weed’ or ‘bladder wrack’ |
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Page illustrates some of the variability of Fucus – from sewer outfall to estuary Hays Creek Has been
treated as single species for last 50 years – changes might be coming ‘Rapidly evolving’
see paper below – but different DNA ‘markers’ will have to be used |
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Sewer outfall
wall |
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While
not shown here in detail – higher ones small – mid ones with gas bladder and
lower ones often flat and look to be many years old |
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Hays Creek
Estuary |
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Both
these are same speicies as above – Fucus ability to grown in almost fresh
water – and often unattached makes for some strange looking plants ---
usually considered to be sterile and the ‘fertilized eggs’ coming form near by
populations on rocks |
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One on left
was attached to a rock |
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Number
2 was growing unattached --- 1 is more typical with dichotomous divisions of
blade etc |
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Fucus distichus
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A
recent (2006) DNA paper shows that the main center of Fucus distichus is the
Pacific – which is some ironic because the ‘type’ location is presumably
Europe (Linnaeus named it and that is the rule—first named collection is ‘type)
–but the DNA showed that one to be least variable – while Pacific one (which
was until last year treated as a sub-species of
Atlantic entity—or as a unique species in Pacific
) – has 9X more ‘haplotype’ variability --- -- in fact it was the ancestor of
4 different Atlantic species -- DNA paper
online and readable --- full taxonomic hierarchy here |
Created by LG on 22/7/2007
Last updated on Sunday, July 22, 2007