Mountain stoneflies may tolerate warming streams: Evidence from organismal physiology and gene expression.

Global Change Biology
Scott HotalingJoanna L Kelley

Abstract

Rapid glacier recession is altering the physical conditions of headwater streams. Stream temperatures are predicted to rise and become increasingly variable, putting entire meltwater-associated biological communities at risk of extinction. Thus, there is a pressing need to understand how thermal stress affects mountain stream insects, particularly where glaciers are likely to vanish on contemporary timescales. In this study, we measured the critical thermal maximum (CTMAX ) of stonefly nymphs representing multiple species and a range of thermal regimes in the high Rocky Mountains, USA. We then collected RNA-sequencing data to assess how organismal thermal stress translated to the cellular level. Our focal species included the meltwater stonefly, Lednia tumana, which was recently listed under the U.S. Endangered Species Act due to climate-induced habitat loss. For all study species, critical thermal maxima (CTMAX  > 20°C) far exceeded the stream temperatures mountain stoneflies experience (<10°C). Moreover, while evidence for a cellular stress response was present, we also observed constitutive expression of genes encoding proteins known to underlie thermal stress (i.e., heat shock proteins) even at low temperatures that reflect...Continue Reading

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Citations

Sep 16, 2020·Global Change Biology·Jackson H BirrellH Arthur Woods
Jan 25, 2021·The Science of the Total Environment·Alessandro FilazzolaJ Scott MacIvor
Jan 7, 2021·Global Change Biology·Stefano BrighentiConstance I Millar

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