Figure 1.
Theoretical patterns of thermal performance.
A comparison of thermal performance in populations from warmer versus colder environments could exhibit (A) Local adaptation as predicted by optimality models in which thermal tolerance and optima has diverged amongst populations according to their local thermal experience. (B) Co-gradient variation whereby genetic and environmental influences are positively associated across a thermal gradient. (C) Counter-gradient variation whereby genetic and environmental influences are negatively associated across a thermal gradient or (D) No divergence in thermal performance amongst warm and cold locations. Figure modified from Fig 3.19 in Angiletta (2009) [20].
Table 1.
Mean body mass (wet weight, g) of reef fish used in metabolism experiments at each location (Heron and Lizard Island) and temperature group.
Figure 2.
A latitudinal comparison of oxygen consumption in cardinalfish.
Maximum (open circles) and resting (solid circles) rates of oxygen consumption of two cardinalfish species from a high-latitude Great Barrier Reef location (Heron Island: solid lines) and a lower latitude Great Barrier Reef location (Lizard Island: dashed lines). Values are means ± SE from 5–12 fish.
Figure 3.
A latitudinal comparison of oxygen consumption in damselfish.
Maximum (open circles) and resting (solid circles) rates of oxygen consumption of four damselfish species from a from a high-latitude Great Barrier Reef location (Heron Island: solid lines) and a lower latitude Great Barrier Reef location (Lizard Island: dashed lines). Values are means ± SE from 5–12 fish.
Table 2.
Statistical results of two-way ANOVA analyses on the effects of latitude and increasing temperature on (a) MO2Rest, (b) MO2Max and (c) aerobic scope for two cardinalfish species and four damselfish species.
Table 3.
Multiple comparison test results comparing the effect of rising temperatures on (a) MO2Rest, (b) MO2Max and (c) aerobic scope for two cardinalfish species and four damselfish species at two reef locations.
Figure 4.
A latitudinal comparison of aerobic scope in cardinalfish and damselfish.
Aerobic scope (MO2Max - MO2Rest) in two cardinalfishes and four damselfishes from a high-latitude Great Barrier Reef location (Heron Island: open circles, solid lines) and a lower latitude Great Barrier Reef location (Lizard Island: solid circles, dashed lines). Values are means ± SE from 5–12 fish.