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Figure 6.9 Two of the streams sampled at Hengill, Iceland. The stream on the right is
cold (range 2-8 °C), whereas the stream to the left is geothermally heated (range
15-23 °C). Both streams are spring fed and less than 50 m long before their confluence
with the main river.
(a)
(b)
0.6
0.8
0.7
0.5
0.6
0.4
0.5
0.3
0.4
0.3
0.2
0.2
0.1
0.1
0
0
(c)
(d)
200
1.4
1.2
160
1.0
120
0.8
80
0.6
40
0.4
0
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0
-40
0
5
10
15
20
25
0
5
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15
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25
Temperature (°C)
Temperature (°C)
Figure 6.10 Variation in structural and functional attributes of contrasting stream
ecosystems at Hengill, Iceland, in relation to differences in stream temperature.
(a) macro-invertebrate evenness; (b) loss in leaf mass from fine-mesh litter bags; (c) loss
in leaf mass from coarse-mesh litter bags; and (d) additional effect on leaf mass loss of P
in the N + P treatment (Friberg et al . 2009).
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