Transcriptome wide analyses reveal intraspecific diversity in thermal stress responses of a dominant habitat‐forming species

Author:

Nicastro Katy R.,Pearson Gareth A.,Ramos Xana,Pearson Vasco,McQuaid Christopher D.,Zardi Gerardo I.

Abstract

AbstractThe impact of climate change on biodiversity has stimulated the need to understand environmental stress responses, particularly for ecosystem engineers whose responses to climate affect large numbers of associated organisms. Distinct species differ substantially in their resilience to thermal stress but there are also within-species variations in thermal tolerance for which the molecular mechanisms underpinning such variation remain largely unclear. Intertidal mussels are well-known for their role as ecosystem engineers. First, we exposed two genetic lineages of the intertidal mussel Perna perna to heat stress treatments in air and water. Next, we ran a high throughput RNA sequencing experiment to identify differences in gene expression between the thermally resilient eastern lineage and the thermally sensitive western lineage. We highlight different thermal tolerances that concord with their distributional ranges. Critically, we also identified lineage-specific patterns of gene expression under heat stress and revealed intraspecific differences in the underlying transcriptional pathways in response to warmer temperatures that are potentially linked to the within-species differences in thermal tolerance. Beyond the species, we show how unravelling within-species variability in mechanistic responses to heat stress promotes a better understanding of global evolutionary trajectories of the species as a whole in response to changing climate.

Funder

Fundação para a Ciência e a Tecnologia

ANR

Department of Science and Technology, Republic of South Africa

European Union's Horizon 2020 research and innovation programme

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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