. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POPULATION DYNAMICS OF ASCIDIA 633 15 10 5. S%0 32-1 30 28 J M M J S N J M M J S N At°C 15 m A t C 20 m 1 3 3 1 i ^Y;-''^n^"^''"]^v\.-,/i^ \i\n .J^~^\/^'\j \j V I I I I I I h"^ V- r. -'L ;-''-i/v /\ V" /\r, , A â iYj\i W\ ^'j"\r'-^.>^\>y, I I A . , N aS%( -3-' 3 1 I 1971 I -72 I -73 I -74 i -75 i -76 i -77 i -78 i -79 i -80 i -81 i -82 i 15m |\ A S %( -1 -I â 3 I I 3i 1 â it' ^^ ' \i I \ j^ w'^^"y/''^J 'Y^ijiiV u^ I I I I I I I I I I I I 20 m â 1 â 3- In J A \i\p \ i\ \l\l '''f^
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POPULATION DYNAMICS OF ASCIDIA 633 15 10 5. S%0 32-1 30 28 J M M J S N J M M J S N At°C 15 m A t C 20 m 1 3 3 1 i ^Y;-''^n^"^''"]^v\.-,/i^ \i\n .J^~^\/^'\j \j V I I I I I I h"^ V- r. -'L ;-''-i/v /\ V" /\r, , A â iYj\i W\ ^'j"\r'-^.>^\>y, I I A . , N aS%( -3-' 3 1 I 1971 I -72 I -73 I -74 i -75 i -76 i -77 i -78 i -79 i -80 i -81 i -82 i 15m |\ A S %( -1 -I â 3 I I 3i 1 â it' ^^ ' \i I \ j^ w'^^"y/''^J 'Y^ijiiV u^ I I I I I I I I I I I I 20 m â 1 â 3- In J A \i\p \ i\ \l\l '''f^l \ ,U i ^"TT \ \,-/^'\'' \r}/\i\, Figure 2. Below: temperature and salinity anomalies at two depth levels (15 and 20 m) calculated as the mean monthly deviation from the 12-year mean. Above: mean yearly temperature (left) and salinity (right) patterns at two depth levels. Data from Bomo Hydrographical Station in the inner part of the Gullmarsfjord. "Baltic-water," influenced by outflow from the Baltic Sea (S < 30%o). The lower water mass (S = 31-34%o) originates in the Skagerrak and is derived ultimately from the open North Sea. The discontinuity between these two water masses is normally found at depths between 10 and 15 m but is subject to rapid vertical displacements of considerable magnitude and may penetrate to a depth of 20 m (see Svansson, 1975). Faunal components of the study sites All the stations are dominated by ascidians. Other organisms, however, are con- stituents of the substratum on which the ascidian populations fluctuate. On the exposed station SI background organisms are mainly the tube building polychaete, Pomatoceros triqueter (L.), and the encrusting algae, Lithothamnion Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods
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