figure 1. monthly air temperatures (mean ± 1 sd) measured at charles darwin research station, santa...
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Mea
n (±
1 S
D)
air
tem
pera
ture
23
24
25
26
27
28
1988 1990 1992 1994 1996 1998
Figure 1. Monthly air temperatures (mean ± 1 SD) measured at Charles Darwin Research Station, Santa Cruz.
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998
Tot
al a
nnua
l rai
nfal
l (in
mm
)
0
1000
2000
3000
4000
Figure 2. Total annual rainfall (in mm) measured at Charles DarwinResearch Station, Santa Cruz.
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998
Me
an
mo
nth
ly s
ea
-su
rfa
ce a
no
ma
ly
-3
-2
-1
0
1
2
3
Figure 3. Mean monthly sea-surface temperature anomaly (in ºC).The anomaly is calculated as the deviation from the 19-year mean of 23.72 ºC(data from Snell and Rea 1999).
Sea surface temperature (°C)
20 22 24 26 28 30 32
He
igh
t of
alg
ae
(mm
)
0
2
4
6
8
10
Lower intertidal samplesMedium intertidal samplesUpper intertidal samples
Figure 4. Algal growth on Genovesa and Santa Fe Islands during a periodfrom 1991-1993. Each point represents the mean of 16 samples(after Wikelski et al. 1997).
Snout-vent length (mm)
100 150 200 250 300 350 400 450 500
Sto
mac
h co
nten
ts m
ass
(g)
0
2
4
6
8
10
12
14
16
During 1991/1992 ENSOAfter 1991/1992 ENSO
Figure 8. Dry weight stomach contents in marine iguanas on Santa FeIsland. (after Wilkelski et al. 1997). Gut contents during the 1991-1992 ENSOcontained feces, iguana skin, and soil in addition to brown algae.
Co
nd
itio
n I
nd
ex
(We
ight
/Le
ng
th3 )
in g
/m3
30
40
50
60
70
1981 1982 1983 1984 1985 1986 1987
Figure 9. Adult female iguana condition index on Santa Fe Island. (after Laurie 1990)