274
12000
10000
l!! 8000
QI
E
·u
QI
a.
tJ) 6000
'0
d
z
2000
M. VANNUCCI andD. NAVAS:
•
0+0.-.--.-------,------,
o /<250 <500
<1000
>1000
<125
Depth of hauls (m)
Fig. 1. Cumulative curves of frequency versus depth distribution of Aglaura hemistoma (closed
circles) and Lyriope tetraphylla (open circles). The curves were obtained by plotting the sums of all the
specimens taken with open nets from the depths indicated to the surface
10
III
ffi 8
E
. ~ 6
a.
III
'04
d
z 2
00 /<250 <500
< 1000
<125 Depth of hauls (m)
Fig. 2. Cumulative curves of frequency versus depth distribution (obtained as in Fig. 1.) of Euphysora
furcata
may help to keep the 2 species separate. Fig. 2 shows the different depth distribution
pattern of Euphysora furcata, a cold-water species found to sink at the sub-Antarctic
convergence.
Few species were found to be euryhaline, eurythermal and widely tolerant for
dissolved O2 and some of these are rare, e.g. Vannuccia forbesi which is eurytopic for