In the Light of Evolution Volume I: Adaptation and Complex Design (2007) / Chapter Skim
Currently Skimming:
Pages 225-238
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 225... ...
Department of ecology and evolutionary Biology, University of California, irvine, CA 92697; †Department of Microbiology and Molecular Genetics, Michigan state University, east lansing, Mi 48824; and ‡national Aeronautics and space Administration Astrobiology institute.
|
From page 226... ...
. natural selection is con 1859b, )
|
From page 227... ...
at 20°C are shown in Table 12.2. The temperature that each derived line had experienced before its evolution at 20°C had no significant effect on the extent of adaptation to 20°C (F3,20 ± 0.497, P = 0.69)
|
From page 228... ...
22 / Albert F Bennett and Richard E
|
From page 229... ...
An Experimental Test of Evolutionary Trade-Offs During Temperature Adaptation / 22 +1 +2 +3 Mean ± 0.998 ± 0.058 1.030 ± 0.129 1.037 ± 0.032 1.066 0.022 ± 1.109 ± 0.054 1.234 ± 0.078 1.153 ± 0.057 1.173 0.062 ± 0.987 ± 0.044 0.994 ± 0.022 0.976 ± 0.042 1.004 0.037 ± 1.111 ± 0.041 1.105 ± 0.061 1.098 ± 0.032 1.126 0.071 ± 0.977 ± 0.045 1.033 ± 0.038 0.990 ± 0.030 0.986 0.059 ± 1.268 ± 0.092 1.119 ± 0.051 1.113 ± 0.051 1.053 0.047 ± 1.015 ± 0.027 0.998 ± 0.036 1.014 ± 0.041 0.967 0.063 ± 1.131 ± 0.046 0.994 ± 0.135 1.116 ± 0.054 1.068 0.047 +1 +2 +3 0.107 0.110 0.204 P < 0.001 P = 0.003 P = 0.003 0.122 0.124 0.111 P = 0.001 P < 0.001 P < 0.001 0.067 0.291 0.086 P = 0.022 P < 0.001 P = 0.003 0.100 0.117 −0.005 P = 0.004 P < 0.001 P = 0.466 The mean ΔW for all 24 lines was −0.094 (±0.047 95% confidence limit, P < 0.0001)
|
From page 230... ...
20 / Albert F Bennett and Richard E
|
From page 231... ...
An Experimental Test of Evolutionary Trade-Offs During Temperature Adaptation / 2 (Mongold et al., 1996) , four had significant decrements in fitness at 40°C, whereas two showed no significant trade-off (unpublished data)
|
From page 232... ...
22 / Albert F Bennett and Richard E
|
From page 233... ...
An Experimental Test of Evolutionary Trade-Offs During Temperature Adaptation / 2 +1 +2 +3 Mean 0.488 ± 0.066 1.064 ± 0.037 0.982 ± 0.049 0.917 ± 0.224 0.527 ± 0.145 1.046 ± 0.043 0.919 ± 0.051 0.798 ± 0.222 1.008 ± 0.056 0.919 ± 0.065 1.047 ± 0.041 0.947 ± 0.182 0.941 ± 0.039 0.947 ± 0.037 0.952 ± 0.026 0.870 ± 0.138 1.113 ± 0.040 1.136 ± 0.044 1.082 ± 0.073 1.115 ± 0.028 1.077 ± 0.067 1.114 ± 0.052 1.204 ± 0.109 1.048 ± 0.107 1.104 ± 0.039 1.079 ± 0.059 1.114 ± 0.067 1.083 ± 0.024 1.003 ± 0.237 0.984 ± 0.077 0.942 ± 0.083 0.970 ± 0.038 +1 +2 +3 0.039 −0.018 −0.063 P = 0.271 P = 0.214 P = 0.023 −0.068 0.028 −0.094 P = 0.014 P = 0.182 P < 0.001 −0.036 −0.021 0.122 P = 0.133 P = 0.221 P = 0.019 −0.101 −0.095 −0.172 P = 0.152 P = 0.016 P = 0.001 Therefore, although the trade-off pattern is general, it cannot be universal. Which is more important in considering and discussing evolutionary trade-offs?
|
From page 234... ...
one factor contributing to the absence of any compelling quantitative relationship is the divergence in the direction of the correlated fitness response measured at 40°C, as discussed in the previous section. Another factor is that the genetic variation among the lines is much lower for the direct fitness response at 20°C than for the correlated response measured at 40°C, making it more difficult to detect the underlying quantitative relationship, if any.
|
From page 235... ...
. investigation of the genetic bases underlying low-temperature adaptation in these lineages is now in progress, and the implications of the genetic mechanisms for performance at high temperature are therefore presently unknown.
|
From page 236... ...
2 / Albert F Bennett and Richard E
|
From page 237... ...
. Experimental Measurements The performance metrics used here are the fitnesses of a derived line relative to the common ancestor, measured at both the low selected temperature of 20°C and a high temperature (40°C)
|
From page 238... ...
. Trade-off by each derived line at 40°C was analyzed with a one-tailed t test on the six experimental replicate measurements of ΔW at 40°C, except as noted, when we explored, independently tested, and confirmed the finding that one lineage in fact showed a correlated improvement at this temperature.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.