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The potential for adaptation in a natural Daphnia magna population: broad and narrow-sense heritability of net reproductive rate under Cd stress at two temperatures

Marlies Messiaen UGent, Colin Janssen UGent, Olivier Thas UGent and Karel De Schamphelaere UGent (2012) ECOTOXICOLOGY. 21(7). p.1899-1910
abstract
The existence of genetic variability is a key element of the adaptive potential of a natural population to stress. In this study we estimated the additive and non-additive components of the genetic variability of net reproductive rate (R-0) in a natural Daphnia magna population exposed to Cd stress at two different temperatures. To this end, life-table experiments were conducted with 20 parental and 39 offspring clonal lineages following a 2 x 2 design with Cd concentration (control vs. 3.7 mu g Cd/L) and temperature (20 vs. 24 A degrees C) as factors. Offspring lineages were obtained through inter-clonal crossing of the different parental lineages. The population mean, additive and non-additive genetic components of variation in each treatment were estimated by fitting an Animal Model to the observed R-0 values using restricted maximum likelihood estimation. From those estimates broad-sense heritabilities (H-2), narrow-sense heritabilities (h(2)), total (CVG) and additive genetic coefficients of variation (CVA) of R-0 were calculated. The exposure to Cd imposed a considerable level of stress to the population, as shown by the fact that the population mean of R-0 exposed to Cd was significantly lower than in the control at the corresponding temperature, i.e. by 23 % at 20 A degrees C and by 88 % at 24 A degrees C. The latter difference indicates that increasing temperature increased the stress level imposed by Cd. The HA(2) and CVG were significantly greater than 0 in all treatments, suggesting that there is a considerable degree of genetic determination of R-0 in this population and that clonal selection could rapidly lead to increasing population mean fitness under all investigated conditions. More specifically, the HA(2) was 0.392 at 20 A degrees C+Cd and 0.563 at 24 A degrees C+Cd; the CVG was 30.0 % at 20 A degrees C+Cd and was significantly higher (147.6 %) in the 24 A degrees C+Cd treatment. Significant values of h(2) (= 0.23) and CVA (= 89.7 %) were only found in the 24 A degrees C+Cd treatment, suggesting that the ability to produce more offspring under this stressful condition may be inherited across sexual generations. In contrast, in the less stressful 20 A degrees C+Cd treatment the h(2) (0.06) and CVA (7.0 %) were very low and not significantly higher than zero. Collectively our data indicate that both the asexual and sexual reproduction phases in cyclic parthenogenetic D. magna populations may play a role in the long-term adaptive potential of Daphnia populations to chemical stress (with Cd as the current example) and that environmental variables which influence the stress level of that chemical may influence this adaptive potential (with temperature as current example).
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Genetic variability, Populations, Heritability, Metal, FIELD POPULATIONS, GENETIC-VARIATION, LOCAL ADAPTATION, CADMIUM STRESS, TOXIC STRESS, VARIABILITY, RESISTANCE, TOLERANCE, EVOLUTION, ECOTOXICOLOGY
journal title
ECOTOXICOLOGY
Ecotoxicology
volume
21
issue
7
pages
1899 - 1910
Web of Science type
Article
Web of Science id
000308235500013
JCR category
ENVIRONMENTAL SCIENCES
JCR impact factor
2.773 (2012)
JCR rank
48/209 (2012)
JCR quartile
1 (2012)
ISSN
0963-9292
DOI
10.1007/s10646-012-0923-2
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2128904
handle
http://hdl.handle.net/1854/LU-2128904
date created
2012-06-01 13:24:41
date last changed
2013-07-12 16:42:25
@article{2128904,
  abstract     = {The existence of genetic variability is a key element of the adaptive potential of a natural population to stress. In this study we estimated the additive and non-additive components of the genetic variability of net reproductive rate (R-0) in a natural Daphnia magna population exposed to Cd stress at two different temperatures. To this end, life-table experiments were conducted with 20 parental and 39 offspring clonal lineages following a 2 x 2 design with Cd concentration (control vs. 3.7 mu g Cd/L) and temperature (20 vs. 24 A degrees C) as factors. Offspring lineages were obtained through inter-clonal crossing of the different parental lineages. The population mean, additive and non-additive genetic components of variation in each treatment were estimated by fitting an Animal Model to the observed R-0 values using restricted maximum likelihood estimation. From those estimates broad-sense heritabilities (H-2), narrow-sense heritabilities (h(2)), total (CVG) and additive genetic coefficients of variation (CVA) of R-0 were calculated. The exposure to Cd imposed a considerable level of stress to the population, as shown by the fact that the population mean of R-0 exposed to Cd was significantly lower than in the control at the corresponding temperature, i.e. by 23 \% at 20 A degrees C and by 88 \% at 24 A degrees C. The latter difference indicates that increasing temperature increased the stress level imposed by Cd. The HA(2) and CVG were significantly greater than 0 in all treatments, suggesting that there is a considerable degree of genetic determination of R-0 in this population and that clonal selection could rapidly lead to increasing population mean fitness under all investigated conditions. More specifically, the HA(2) was 0.392 at 20 A degrees C+Cd and 0.563 at 24 A degrees C+Cd; the CVG was 30.0 \% at 20 A degrees C+Cd and was significantly higher (147.6 \%) in the 24 A degrees C+Cd treatment. Significant values of h(2) (= 0.23) and CVA (= 89.7 \%) were only found in the 24 A degrees C+Cd treatment, suggesting that the ability to produce more offspring under this stressful condition may be inherited across sexual generations. In contrast, in the less stressful 20 A degrees C+Cd treatment the h(2) (0.06) and CVA (7.0 \%) were very low and not significantly higher than zero. Collectively our data indicate that both the asexual and sexual reproduction phases in cyclic parthenogenetic D. magna populations may play a role in the long-term adaptive potential of Daphnia populations to chemical stress (with Cd as the current example) and that environmental variables which influence the stress level of that chemical may influence this adaptive potential (with temperature as current example).},
  author       = {Messiaen, Marlies and Janssen, Colin and Thas, Olivier and De Schamphelaere, Karel},
  issn         = {0963-9292},
  journal      = {ECOTOXICOLOGY},
  keyword      = {Genetic variability,Populations,Heritability,Metal,FIELD POPULATIONS,GENETIC-VARIATION,LOCAL ADAPTATION,CADMIUM STRESS,TOXIC STRESS,VARIABILITY,RESISTANCE,TOLERANCE,EVOLUTION,ECOTOXICOLOGY},
  language     = {eng},
  number       = {7},
  pages        = {1899--1910},
  title        = {The potential for adaptation in a natural Daphnia magna population: broad and narrow-sense heritability of net reproductive rate under Cd stress at two temperatures},
  url          = {http://dx.doi.org/10.1007/s10646-012-0923-2},
  volume       = {21},
  year         = {2012},
}

Chicago
Messiaen, Marlies, Colin Janssen, Olivier Thas, and Karel De Schamphelaere. 2012. “The Potential for Adaptation in a Natural Daphnia Magna Population: Broad and Narrow-sense Heritability of Net Reproductive Rate Under Cd Stress at Two Temperatures.” Ecotoxicology 21 (7): 1899–1910.
APA
Messiaen, Marlies, Janssen, C., Thas, O., & De Schamphelaere, K. (2012). The potential for adaptation in a natural Daphnia magna population: broad and narrow-sense heritability of net reproductive rate under Cd stress at two temperatures. ECOTOXICOLOGY, 21(7), 1899–1910.
Vancouver
1.
Messiaen M, Janssen C, Thas O, De Schamphelaere K. The potential for adaptation in a natural Daphnia magna population: broad and narrow-sense heritability of net reproductive rate under Cd stress at two temperatures. ECOTOXICOLOGY. 2012;21(7):1899–910.
MLA
Messiaen, Marlies, Colin Janssen, Olivier Thas, et al. “The Potential for Adaptation in a Natural Daphnia Magna Population: Broad and Narrow-sense Heritability of Net Reproductive Rate Under Cd Stress at Two Temperatures.” ECOTOXICOLOGY 21.7 (2012): 1899–1910. Print.