Abstract
Effects of acclimation temperature on critical thermal limits and swimming performance of the state-endangered bigeye chub Hybopsis amblops
Highlights
For ectothermic organisms including fish, temperature is one of the most critical abiotic factors, and is recognized as an important ecological resource (Magnuson et al 1979)
Bigeye chub acclimated to 26°C began to show avoidance behaviors (i.e. ATmax) and lost equilibrium (i.e. critical thermal maximum (CTmax)) at 3.4 and 3.6°C higher, respectively, than fish acclimated to 21°C (Tukey’s HSD, p < 0.05) (Table 2)
Inspection of CTmax and ATmax data across trials showed that changes in responses across trials were small (≤1.8°C on average across replicates), and no consistent or predictable changes in behavioral responses occurred over time (Fig. A2)
Summary
For ectothermic organisms including fish, temperature is one of the most critical abiotic factors, and is recognized as an important ecological resource (Magnuson et al 1979). With exposure to sustained elevated temperatures or more intermittent heat waves, fish can suffer negative consequences including increased energy use, impaired swimming performance, reductions in fitness, altered range limits, or even death (Huey 1991, Beitinger et al 2000, Xia et al 2017, Morgan et al 2018). The species once had a widespread distribution in North America, from the drainages of Lakes Ontario and Erie in the north to the Tennessee River drainage in the south (Page & Burr 2011). It is typically found in clear, gravel-bottomed streams with permanent flow and little silt, preferring to reside at the base of riffles or in quiet pools (Pfleiger 1997). The presence of bigeye chub has been viewed as an indicator of excellent water quality
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