A biological study of Durvillaea antarctica (Chamisso) Hariot and D ...

6
2 _ J Mfl.RKGD
(a)
Labels or ties attached direc'cly to De
antarctica plants;
either around the stipe I or through holes in the lamina_ or holc1fast.
did not :remain for long. Only 16~. of t...he labels tied around D.
antarctica stipes survived longer than six weeks.
Dr Alan Mark and
o·thers from Oti=lgo University, working- ere easily replaced, and no label
locat.ions were lost. Periodic scrubbing \flith a stiff na.il-brush
vJas necessary to keep t.he numbers clean. On an D_ver-age ea.ch label
\'10_5 used 'co loco. tc the pos i tions of foux:- D. an tarc-tiea plan ts ,
'£his technique \Vas unsuitable for D. wiltona because of the
r('llativ21y short time that this species was accessible, and because
drilling holes in shallow water ",as very difficult, COl11mex-cially
available
(Pig. 2. '7) ~
"Allflex" ear tags for stock were used ins-tead
These were riveted through -i::.he palm region of -the
primary blade, and could be B_ttached in seconds. 'l'he rate of less
of these lahels vms much higher t.han that of the "Dax:vic" labels.
'fhey could not be used on small
and they were lost if