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Plastic responses to diel thermal variation in juvenile green sturgeon, Acipenser medirostris. | LitMetric

Plastic responses to diel thermal variation in juvenile green sturgeon, Acipenser medirostris.

J Therm Biol

Department of Wildlife, Fish and Conservation Biology, University of California Davis, One Shields Avenue, Davis, CA 95616, USA. Electronic address:

Published: August 2018

AI Article Synopsis

Article Abstract

Human-induced thermal variability can disrupt energy balance and performance in ectotherms; however, phenotypic plasticity may play a pivotal protective role. Ectotherm performance can be maintained in thermally heterogeneous habitats by reducing the thermal sensitivity of physiological processes and concomitant performance. We examined the capacity of juvenile green sturgeon (Acipenser medirostris) to respond to daily thermal variation. Juveniles (47 days post-hatch) were exposed to either stable (15 ± 0.5 °C) or variable (narrowly variable: 13-17 °C day or widely variable 11-21 °C day) thermoperiod treatments, with equivalent mean temperatures (15 ± 0.5 °C), for 21 days. Growth (relative growth rate, % body mass gain), upper thermal tolerance (critical thermal maxima, CTMax) and the thermal sensitivity of swimming performance (critical swimming speed, U) were assessed in fish from all treatments. Accelerated growth was observed in fish maintained under widely variable temperatures compared to narrowly variable and stable temperatures. No significant variation in CTMax was observed among thermoperiod treatments, suggesting all treatment groups acclimated to the mean temperature rather than daily maximums. The widely variable treatment induced a plastic response in swimming performance, where U was insensitive to temperature and performance was maintained across a widened thermal breadth. Maximum U attained was similar among thermoperiod treatments, but performance was maximised at different test temperatures (stable: 4.62 ± 0.44 BL s at 15 °C; narrowly variable: 4.52 ± 0.23 BL s at 21 °C; widely variable: 3.90 ± 0.24 BL s at 11 °C, mean ± s.e.m.). In combination, these findings suggest juvenile A. medirostris are resilient to daily fluctuations in temperature, within the temperature range tested here.

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Source
http://dx.doi.org/10.1016/j.jtherbio.2018.07.015DOI Listing

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