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Replication Data for: Warming stochastic diet thermal fluctuations affect physiological performance and gill plasticity in an amphibious mangrove fish.
Borealis
Currie, Suzanne — 2024-07-03 The purpose of this study was to determine if ecologically relevant stochastic temperature fluctuations affected physiologically responses in a mangrove fish. We acclimated fish to two different temperature diel cycles both fluctuating from 27 - 35 degrees celcius. One cycle was regular and predictable and the other was stochastic. We measured survival, fecundity, growth rate, thermal traits, ventilation frequency, and gill morphometrics.
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Data from: Social cues can push amphibious fish to their thermal limits
Dryad
Currie, Suzanne; Tattersall, Glenn J. — 2018-10-09 Social context can impact how animals respond to changes in their physical environment. We used an aggressive, amphibious fish, the mangrove rivulus (Kryptolebias marmoratus) with environmentally-determined sociality to test the hypothesis that social interactions would push fish to their thermal limits. We capitalized on the propensity of rivulus to emerse from warming water and demonstrated that social stimuli, produced by their reflection, increased emersion threshold without changing critical thermal maximum, effectively diminishing thermal safety margins. When rivulus were denied air access, surface behaviours dramatically increased, supplanting social interactions. This suggests that assessing the terrestrial environment is crucially important. We conclude that social stimulation narrows the scope for survival in naturally stressful conditions.
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Mangrove fishes rely on emersion behavior and physiological tolerance to persist in sulfidic environments
Borealis
Rossi, Giulia; Tunnah, Louise; Martin, Keri E.; Turko, Andy J.; Taylor, D. Scott; Currie, Suzanne; Wright, Patricia A. — 2020-03-04 Hydrogen sulfide (H2S) is a potent respiratory toxin that makes sulfidic environments tolerable to only a few organisms. We report the presence of fishes (Kryptolebias marmoratus, Poecilia orri, Gambusia sp., and Dormitator maculatus) in Belizean mangrove pools with extremely high H2S concentrations (up to 1,166 mM) that would be lethal for most fishes. Thus, we asked whether the three most prevalent species (Kryptolebias, Poecilia, and Gambusia) persist in sulfidic pools because they are exceptionally H2S tolerant and/or because they can leave water (emerse) and completely avoid H2S. We show that both physiological tolerance and emersion behavior are important. Kryptolebias demonstrated high H2S tolerance, as they lost equilibrium significantly later than Poecilia and Gambusia during H2S exposure (1,188 +/- 21 mM H2S). However, the fact that all species lost equilibrium at an ecologically relevant [H2S] suggests that physiological tolerance may suffice at moderate H2S concentrations but that another strategy is required to endure higher concentrations. In support of the avoidance behavior hypothesis, H2S elicited an emersion response in all species. Kryptolebias was most sensitive to H2S and emersed at H2S concentrations 52% and 34% lower than Poecilia and Gambusia, respectively. Moreover, H2 Sexposure caused Kryptolebias to emerse more frequently and spend more time out ofwater compared to control conditions. We suggest that physiological H2S tolerance and emersion behavior are complementary strategies. The superior H2S tolerance and amphibious capability of Kryptolebias may explain why this species was more prevalent in H2S-rich environments than other local fishes.

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(Author: Currie, Suzanne)

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