A biological study of Durvillaea antarctica (Chamisso) Hariot and D ...
A biological study of Durvillaea antarctica (Chamisso) Hariot and D ...
A biological study of Durvillaea antarctica (Chamisso) Hariot and D ...
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178<br />
2 MeasuY@ments <strong>of</strong> st<strong>and</strong>ing crop<br />
<strong>and</strong> holdfast covex-.<br />
(kgjm2) ,<br />
numerical density<br />
Location<br />
Date <strong>of</strong><br />
clearance<br />
Dl.Il'vi l Zaea <strong>antarctica</strong><br />
St<strong>and</strong>ing<br />
crop<br />
(kgjm 2 )<br />
Numerical<br />
density<br />
No.>lmjrn 2<br />
% cover<br />
by<br />
holdfasts<br />
<strong>of</strong>'<br />
Arel~<br />
transect.<br />
(m 2 )<br />
Tautuku 1a May 1972<br />
26.8<br />
23.8<br />
'l'a.u t.uk u Ie 28 July 1972<br />
24.4<br />
7.3<br />
23.6<br />
14.6<br />
'l'autuku 5a 8 Oct:ober 1972<br />
15,3<br />
5.0<br />
2B.O<br />
Taut.uku 6 27 February 1973<br />
22.7<br />
4.8<br />
37.4<br />
Tautuku 7 22 June 1973<br />
33.0<br />
5.9<br />
18.3<br />
16.3<br />
Tautuku a 2 September 1973<br />
18.5<br />
5.9<br />
10.2<br />
17.3<br />
Tautuku 9 2 November 1973<br />
22.4<br />
7.0<br />
15.8<br />
21.6<br />
Tautuku 10 2 May 1974<br />
30.4<br />
2.6<br />
4.8<br />
22.0<br />
Bethells 28 September 1973<br />
19.5<br />
12.9<br />
14.0<br />
2.4<br />
Kean Point 23 April 1973<br />
15.3<br />
4.5<br />
4.6<br />
69.0<br />
Daro 31 July 1973<br />
9.9<br />
401<br />
5.4<br />
36.0<br />
Ohau Point 3 January 1973<br />
20.6<br />
9.9<br />
8.2<br />
Ringaringa 13 Decernbe:L' 1973<br />
10.9<br />
2.7<br />
4.4<br />
87.0<br />
Duroi Z Zaea wi Z lana<br />
Parititahi 18 J'anuary 1973<br />
23.3<br />
3.14-<br />
13.3<br />
Tautuku 3 March 1975<br />
91L4<br />
17.5<br />
8.0<br />
8.5<br />
When harvesting is considered/ st<strong>and</strong>ing crop is more usefully<br />
expressed in terms <strong>of</strong> shore length, rather than a squa"8 metre <strong>of</strong><br />
rock. Expressed in these terms (Table B.3) st<strong>and</strong>ing crop was highest<br />
on the most gently sloping shores, <strong>and</strong> was lowest on the steepest<br />
shores, despite the fact that the reverse situation applied \'lhen<br />
st<strong>and</strong>ing c.'cop \'las expressed as kgjm 2 • This was not unexpected, however,<br />
because the 'iJidth <strong>of</strong> the D. antal'ctica belt is directly proportional.<br />
to the shore slope (Fig. B.4).<br />
With the exception <strong>of</strong> some cliff coasts, rocky shore topography<br />
is rarely uniform for more than a few hundred metres. An accu:cate<br />
estimate <strong>of</strong> mean st<strong>and</strong>ing crop can therefore only be obtained by<br />
re the results <strong>of</strong> many tra.nsects to a slUa.ll SCC).le contour map
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