Diversity and Vertical Migration of Buphausiids (Straits of Messina)
137
146 and 94 m, E. hemigibba at 115 and 187 m,
Nematoscelis megalops at 155 and 300 m, N.
atlantica at 180 and 423 m, and S. abbreviatum at
89 and 137 m, while only juveniles of E. hemigibba (1750 m, at station J1) and N. megalops (1125
and 800 m at stations J2 and Tl) were found
deeper.
Day/Night Vertical Migration
Day/night vertical distribution of E. hemigibba,
N. megalops and E. krohni in Ionian basin and of
T. aequalis, E. hemigibba, N. megalops and S.
abbreviatum in southern Tyrrhenian Sea are
reported in Figs. 4 and 5. Some of these species
Euphausia hemigibba
,..-..
8
'--'
.s 0.. C\)
0
morning
100 SO
0
50 100
o r-----;,..--250
500
750
1000
1250
1500
1750
2000
300
0
250
500
750
1000
1250
1500
1750
2000
150 0
150 390
midday
afternoon-evening
100 50
0
50 100
100 50
0
50 100
emalo celis megalops
300 150 0
150 300
300 150 0
1 50 300
Euphausia krohni
400 200
0 200 400
400 200
0
200 400
400 200
0
200 400
O r-~---'-" __ ~250
500
750
1000
1250
1500
1750
2000
Individuals per 103
ml
night
100 50
0
50 100
300 150 0
150 300
400 200
0
200 400
Fig. 4. Day/night vertical distribution of juveniles (left) and adults (right) of E. hemigibba, N. megalops and E. krohni in Ionian
Sea