title: The potential for climate-driven bathymetric range shifts: sustained temperature and pressure exposures on a marine ectotherm, Palaemonetes varians.
abstract: Range shifts are of great importance as a response for species facing climate change. In the light of current ocean-surface warming, many studies have focused on the capacity of marine ectotherms to shift their ranges latitudinally. Bathymetric range shifts offer an important alternative, and may be the sole option for species already at high latitudes or those within enclosed seas; yet relevant data are scant. Hydrostatic pressure (HP) and temperature have wide ranging effects on physiology, importantly acting in synergy thermodynamically, and therefore represent key environmental constraints to bathymetric migration. We present data on transcriptional regulation in a shallow-water marine crustacean (Palaemonetes varians) at atmospheric and high HP following 168-h exposures at three temperatures across the organisms' thermal scope, to establish the potential physiological limit to bathymetric migration by neritic fauna. We observe changes in gene expression indicative of cellular macromolecular damage, disturbances in metabolic pathways and a lack of acclimation after prolonged exposure to high HP. Importantly, these effects are ameliorated (less deleterious) at higher temperatures, and exacerbated at lower temperatures. These data, alongside previously published behavioural and heat-shock analyses, have important implications for our understanding of the potential for climate-driven bathymetric range shifts.
authors.affiliation: Ocean and Earth Science , University of Southampton, European Way , Southampton SO14 3ZH, UK.
authors.forename: J P
authors.initials: JP
authors.lastname: Morris
authors.affiliation: Ocean and Earth Science , University of Southampton, European Way , Southampton SO14 3ZH, UK.
authors.forename: S
authors.initials: S
authors.lastname: Thatje
authors.affiliation: Ocean and Earth Science , University of Southampton, European Way , Southampton SO14 3ZH, UK.
authors.forename: D
authors.initials: D
authors.lastname: Cottin
authors.affiliation: Ocean and Earth Science , University of Southampton, European Way , Southampton SO14 3ZH, UK.
authors.forename: A
authors.initials: A
authors.lastname: Oliphant
authors.affiliation: Ocean and Earth Science , University of Southampton, European Way , Southampton SO14 3ZH, UK.
authors.forename: A
authors.initials: A
authors.lastname: Brown
authors.affiliation: UPMC Université Paris 06 , UMR-CNRS 7208, 7 Quai St-Bernard, Paris 75005, France.
authors.forename: B
authors.initials: B
authors.lastname: Shillito
authors.affiliation: UPMC Université Paris 06 , UMR-CNRS 7208, 7 Quai St-Bernard, Paris 75005, France.
authors.forename: J
authors.initials: J
authors.lastname: Ravaux
authors.affiliation: Ocean and Earth Science , University of Southampton, European Way , Southampton SO14 3ZH, UK.
authors.forename: C
authors.initials: C
authors.lastname: Hauton
keywords: hydrostatic pressure; physiological scope; temperature