254
METRE5
I
J. A. KITCHING AND F. J. EBLING
1 E m
m
G
L
1 H
I
-
1 I
-
0
1
2
3
*
5
METRES
PATELLA VULGATA
PATELLA A S R R A
0
-
FIG. 54. Section at Carrigathorna showing tho relative proportions of Patella wulgata and
P . aspern at different shore levels. The arrows show the approximate levels of high and
low water on 20 July 1959, giving a tidal range of 3.9 m for a spring tide with a forecast
height of 3-35 m at Baltimore.
of P. vulgata and the upper limit of P. aspera higher than those reported
from elsewhere (Evans, 1947; Southward, 1953; Southward and Crisp,
1954; Southward and Orton, 1954). We ascribe the high limits of both
species a t Carrigathorna to extreme wave-action.
The vertical distribution of limpets within Lough Ine is exemplified
in a section made at North Wall (Fig. 55) in September 1959, and the
conclusions are supported by records for other parts of the north and
*90 cm
]*m
......................
0 METRES
1
2
FIQ. 55. Section at North Wall, Lough Ine (see Fig. 67), showing relative proportions of
Patella vulgata and P. aspera at different levels, based on a sample of 105 limpets taken
in September 1959. The maximum density was at 40-50 cm above standard level. Standard level is approximately that of low water; the level of high water is about 90 em
higher, and this is exceeded at spring tides.