Kake-Guena 2017 J Therm Biol

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Kake-Guena SA, Touisse K, Warren BE, Scott KY, Blier PU, Lemieux H (2017) Temperature-related differences in mitochondrial function among clones of the cladoceran Daphnia pulex. J Therm Biol 69:23-31.

» PMID: 29037388

Kake-Guena SA, Touisse K, Warren BE, Scott KY, Blier PU, Lemieux H (2017) J Therm Biol

Abstract: This study assessed the thermal sensitivity of mitochondrial respiration in the small crustacean Daphnia pulex. More specifically, we wanted to determine if clones that inhabit different latitudes and habitats showed differences in the thermal sensitivity of their mitochondrial function. The experimental design included two clones from temperate environments (Fence from Ontario and Hawrelak from Alberta) and two clones from subarctic environments (A24 from Manitoba and K154 from Quebec). The integrated mitochondrial function was measured with high-resolution respirometry following whole-animal permeabilization. Mitochondrial respiration was performed under six different temperatures (10, 15, 20, 25, 30, and 35 °C) in the clone Hawrelak and at two temperatures (10 and 20 °C) in the three other clones. In the clone Hawrelak, complexes I and II respiration showed higher sensitivity to temperature variation compared to complex IV respiration. Interestingly, the threshold plot showed no excess capacity of complex IV at 20 °C in this clone. The clones showed significant divergence in the ability to oxidize the complex I and complex IV substrates relative to the maximal oxidative phoshorylation capacity of mitochondria. More importantly, some of the clonal divergences were only detected under low assay temperatures, pointing toward the importance of this parameter in comparative studies. Future and more complex studies on clones from wider environmental gradients will help to resolve the link between mitochondrial function and adaptations of organisms to particular conditions, principally temperature.

Keywords: Daphnia pulex, Daphnia pulicaria clones, Mitochondrial respiration, Thermal sensitivity, Mitochondrial haplotypes Bioblast editor: Lemieux H, Kandolf G O2k-Network Lab: CA Edmonton Lemieux H, CA Rimouski Blier PU

Labels: MiParea: Respiration, Comparative MiP;environmental MiP 

Stress:Temperature  Organism: Crustaceans 

Preparation: Permeabilized tissue 

Regulation: Threshold;excess capacity  Coupling state: LEAK, OXPHOS  Pathway: S, Gp, CIV, NS, ROX  HRR: Oxygraph-2k