Biology Reference
In-Depth Information
100
clear
control
90
80
70
60
50
40
30
20
10
0
92
93
94
95
96
97
Year
Fig. 7.2
Effects of kelp canopy removal on recruitment (% cover) of
Desmarestia ligulata
sporophytes (means
1standard error).
Black bars
represent recruitment into areas where kelp
canopies had been cleared, and
white bars
represent recruitment into areas where the kelp canopies
were unmanipulated (controls) from 1992 to 1997. Reproduced from Edwards (
1998
)
þ
a
b
10
µ
m
2
c
m
c
d
0.5 m
2 m
Fig. 7.3
Photographs of giant kelp (
Macrocystis pyrifera
) showing relative densities of different
ages as the population self-thins.
a
young sporophytes (photo taken on a microscope slide), (
b
)
recruits, (
c
) juveniles, (
d
) adults. Note the differences in scales showing that younger smaller
stages are much more densely packed
¼
