title: Systematic variation in the temperature dependence of physiological and ecological traits.
abstract: To understand the effects of temperature on biological systems, we compile, organize, and analyze a database of 1,072 thermal responses for microbes, plants, and animals. The unprecedented diversity of traits (n = 112), species (n = 309), body sizes (15 orders of magnitude), and habitats (all major biomes) in our database allows us to quantify novel features of the temperature response of biological traits. In particular, analysis of the rising component of within-species (intraspecific) responses reveals that 87% are fit well by the Boltzmann-Arrhenius model. The mean activation energy for these rises is 0.66 ± 0.05 eV, similar to the reported across-species (interspecific) value of 0.65 eV. However, systematic variation in the distribution of rise activation energies is evident, including previously unrecognized right skewness around a median of 0.55 eV. This skewness exists across levels of organization, taxa, trophic groups, and habitats, and it is partially explained by prey having increased trait performance at lower temperatures relative to predators, suggesting a thermal version of the life-dinner principle-stronger selection on running for your life than running for your dinner. For unimodal responses, habitat (marine, freshwater, and terrestrial) largely explains the mean temperature at which trait values are optimal but not variation around the mean. The distribution of activation energies for trait falls has a mean of 1.15 ± 0.39 eV (significantly higher than rises) and is also right-skewed. Our results highlight generalities and deviations in the thermal response of biological traits and help to provide a basis to predict better how biological systems, from cells to communities, respond to temperature change.
authors: Department of Biomathematics, David Geffen School of Medicine, University of California, Los Angeles, CA 90024, USA. adell@ucla.edu
authors: Anthony I
authors: AI
authors: Dell
authors: Samraat
authors: S
authors: Pawar
authors: Van M
authors: VM
authors: Savage
references: Am Nat. 2004 Mar;163(3):429-41
references: 15026978
references: Science. 1974 May 31;184(4140):1001-3
references: 4826166
references: Proc Natl Acad Sci U S A. 2008 May 6;105(18):6668-72
references: 18458348
references: Am Nat. 2005 Aug;166(2):184-98
references: 16032573
references: Am Nat. 2001 Aug;158(2):204-10
references: 18707349
references: Proc Natl Acad Sci U S A. 2006 Jun 13;103(24):9130-5
references: 16754845
references: J Theor Biol. 1981 Feb 21;88(4):719-31
references: 6790878
references: J Bacteriol. 1982 Jan;149(1):1-5
references: 7054139
references: J Cell Comp Physiol. 1946 Aug;28(1):47-75
references: 21002957
references: Am Nat. 2010 Aug;176(2):E40-9
references: 20528470
references: Am Nat. 2008 Mar;171(3):E102-18
references: 18271721
references: Science. 1954 Apr 2;119(3092):442-3
references: 13156620
references: Evolution. 1995 Oct;49(5):848-863
references: 28564867
references: Science. 2001 Sep 21;293(5538):2248-51
references: 11567137
references: Am Nat. 2009 May;173(5):543-53
references: 19296733
references: Am Nat. 2009 Dec;174(6):819-35
references: 19860549
references: Evolution. 1987 Sep;41(5):1098-1115
references: 28563407
references: Comp Biochem Physiol A Mol Integr Physiol. 2000 Sep;127(1):21-8
references: 10996814
references: Annu Rev Biophys Bioeng. 1977;6:111-33
references: 326144
references: Trends Ecol Evol. 1989 May;4(5):131-5
references: 21227334
references: Proc Biol Sci. 2009 Jun 7;276(1664):1939-48
references: 19324762
references: Proc R Soc Lond B Biol Sci. 1979 Sep 21;205(1161):489-511
references: 42057
references: Evolution. 1998 Feb;52(1):219-226
references: 28568148
references: J Theor Biol. 2005 Apr 7;233(3):351-62
references: 15652145
references: J Exp Biol. 1991 Oct;160:1-23
references: 1960510
references: Proc Natl Acad Sci U S A. 1920 Apr;6(4):204-11
references: 16576491
references: Am Nat. 2010 Aug;176(2):227-33
references: 20528477
references: Science. 2002 Aug 30;297(5586):1545-8
references: 12202828
references: Evolution. 1994 Dec;48(6):1747-1763
references: 28565153
references: J Exp Biol. 2007 May;210(Pt 10):1762-7
references: 17488939