Data from: Haemoglobin-mediated response to hyper-thermal stress in the keystone species Daphnia magna
Cuenca Cambronero, Maria, University of Birmingham
Zeis, Bettina, University of Münster
Orsini, Luisa, University of Birmingham
Published Oct 09, 2017 on Dryad.
Cite this dataset
Cuenca Cambronero, Maria; Zeis, Bettina; Orsini, Luisa (2017). Data from: Haemoglobin-mediated response to hyper-thermal stress in the keystone species Daphnia magna [Dataset]. Dryad. https://doi.org/10.5061/dryad.t3j32
Anthropogenic global warming has become a major geological and environmental force driving drastic changes in natural ecosystems. Due to the high thermal conductivity of water and the effects of temperature on metabolic processes, freshwater ecosystems are among the most impacted by these changes. The ability to tolerate changes in temperature may determine species long-term survival and fitness. Therefore, it is critical to identify coping mechanisms to thermal and hyper-thermal stress in aquatic organisms. A central regulatory element compensating for changes in oxygen supply and ambient temperature is the respiratory protein haemoglobin (Hb). Here, we quantify haemoglobin (Hb) plastic and evolutionary response in D. magna (sub)populations resurrected from the sedimentary archive of a lake with known history of increase in average temperature and recurrence of heat waves. By measuring constitutive changes in crude Hb protein content among (sub)populations we assessed evolution of the haemoglobin gene family in response to temperature increase. To quantify the contribution of plasticity in the response of this gene family to hyper-thermal stress, we quantified changes in Hb content in all (sub)populations under hyper-thermal stress as compared to non-stressful temperature. Further, we tested competitive abilities of genotypes as a function of their Hb content, constitutive and induced. We found that haemoglobin (Hb)-rich genotypes have superior competitive abilities as compared to Hb-poor genotypes under hyper-thermal stress after a period of acclimation. These findings suggest that whereas long-term adjustment to higher occurrence of heat waves may require a combination of plasticity and genetic adaptation, plasticity is most likely the coping mechanism to hyper-thermal stress in the short term. Our study suggests that with higher occurrence of heat waves Hb-rich genotypes may be favoured with potential long-term impact on population genetic diversity
Cambronero_etal_microsatellite_genotyping: microsatellite genotyping results for the genotypes used in the study obtained from 13 microsatellite loci arranged in two multiplexes. The genotype IDs are as in Orsini et al, 2016 Molecular Ecology. The microsatellite loci were first published in Jansen et al, 2010 Molecular Ecology Resources as part of a panel of 84 microsatellites. -9 indicates missing data.
National Science Foundation, Award: NERC highlights grant (NE/N016777/1)