Plasticity of thermal tolerance and its relationship with growth rate in juvenile mussels (<i>Mytilus californianus</i>)

Gleason, Lani U.; Strand, Emma; Hizon, Brian J.; Dowd, W. Wesley

doi:10.1098/rspb.2017.2617

Cited by 26 publications

(19 citation statements)

References 66 publications

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“…Due to their sessile nature, which limits behavioral thermoregulation, intertidal mussels experience large body temperature fluctuations with each tidal cycle (Dowd et al, 2015;Jimenez et al, 2015;Miller and Dowd, 2017). Mussels living at different heights on the shore, and with different wave exposures, experience different daily temperature ranges, which allows one to study members of the same species that live in close proximity, but which have substantially different thermal histories (Denny et al, 2011;Gleason et al, 2018;Jimenez et al, 2015;Miller and Dowd, 2017;Moyen et al, 2019;Zippay and Helmuth, 2012). Furthermore, on many rocky shores, mussels are the dominant competitor for space in the mid-intertidal zone, and therefore play an important role in intertidal community ecology (Bayne et al, 1976;Gaylord et al, 2011;Mislan et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Yet we are aware of only one study that has evaluated the effects of removing this variability. Gleason et al (2018) found that the thermal performance of both high-and low-zone juvenile mussels' (as assessed by the temperature at which 50% of mussels died, LT 50 ) decreased after 28 days of constant submersion, while the LT 50 of adult mussels did not change (Gleason et al, 2018). Research on other organisms suggests that adult mussels with different thermal histories might respond differently to constant submersion (Burggren, 2018;Jimenez et al, 2015;Wang et al, 2019;Williams and Somero, 1996) an avenue that Gleason et al (2018) explored only in juvenile, but not adult, mussels.…”

Section: Introductionmentioning

confidence: 99%

“…Gleason et al (2018) found that the thermal performance of both high-and low-zone juvenile mussels' (as assessed by the temperature at which 50% of mussels died, LT 50 ) decreased after 28 days of constant submersion, while the LT 50 of adult mussels did not change (Gleason et al, 2018). Research on other organisms suggests that adult mussels with different thermal histories might respond differently to constant submersion (Burggren, 2018;Jimenez et al, 2015;Wang et al, 2019;Williams and Somero, 1996) an avenue that Gleason et al (2018) explored only in juvenile, but not adult, mussels. Moreover, based on previous literature in other ectotherms like fish (Corey et al, 2017;Healy and Schulte, 2012;Huey and Bennett, 1990), it may take longer than the 28 days of constant submersion used by Gleason et al (2018) to cause a downward shift in thermal performance, and whereas LT 50 values may change with constant submersion, it is unclear whether constant submersion affects cardiac thermal performance, a trait which (unlike LT 50 , i.e.…”

Section: Introductionmentioning

confidence: 99%

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Mussels' acclimatization to high, variable temperatures is lost slowly upon transfer to benign conditions

Moyen

Somero

Denny

2020

Journal of Experimental Biology

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Climate change is increasing the temperature variability animals face, and thermal acclimatization allows animals to adjust adaptively to this variability. Although the rate of heat acclimatization has received some study, little is known about how long these adaptive changes remain without continuing exposure to heat stress. This study explored the rate at which field acclimatization states are lost when temperature variability is minimized during constant submersion. California mussels (Mytilus californianus) with different acclimatization states were collected from high-and low-zone sites (∼12 versus ∼5°C daily temperature ranges, respectively) and then kept submerged at 15°C for 8 weeks. Each week, the cardiac thermal performance of mussels was measured as a metric of acclimatization state: critical (T crit ) and flatline (T flat ) temperatures were recorded. Over 8 weeks of constant submersion, the mean T crit of highzone mussels decreased by 1.07°C from baseline, but low-zone mussels' mean T crit was unchanged. High-and low-zone mussels' mean maximum heart rate (HR) and resting HR decreased ∼12 and 35%, respectively. T flat was unchanged in both groups. These data suggest that T crit and HR are more physiologically plastic in response to the narrowing of an animal's daily temperature range than T flat is, and that an animal's prior acclimatization state (high versus low) influences the acclimatory capacity of T crit . Approximately 2 months were required for the cardiac thermal performance of the high-zone mussels to reach that of the low-zone mussels, suggesting that acclimatization to high and variable temperatures may persist long enough to enable these animals to cope with intermittent bouts of heat stress.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mussels' acclimatization to high, variable temperatures is lost slowly upon transfer to benign conditions

Moyen

Somero

Denny

2020

Journal of Experimental Biology

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“…We compared mussels living at high and low intertidal heights to determine whether heating rate differentially affected cardiac thermal tolerance in animals acclimatized to different exposure conditions. We hypothesized that, because high-zone mussels have a higher cardiac thermal tolerance and experience faster mean daily heating rates than low-zone mussels (Compton et al, 2018;Gleason et al, 2018;Miller and Dowd, 2017), high-zone mussels would better tolerate faster heating rates.…”

Section: Introductionmentioning

confidence: 99%

Impact of heating rate on cardiac thermal tolerance in the California mussel, Mytilus californianus

Moyen

Somero

Denny

2019

Journal of Experimental Biology

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Intertidal communities of wave-swept rocky shores have served as a powerful model system for experiments in ecology, and mussels (the dominant competitor for space in the mid-intertidal zone) play a central role in determining community structure in this physically stressful habitat. Consequently, the ability to account for mussels' physiological responses to thermal stress affects ecologists' capacity to predict the impacts of a warming climate on this ecosystem. Here, we examined the effect of heating rate on cardiac thermal tolerance in the ribbed mussel, Mytilus californianus, comparing populations from high and low sites in the intertidal zone where emersion duration leads to different mean daily heating rates. Two temperature-related cardiac variables were examined: (1) the critical temperature (T crit) at which heart rate (HR) precipitously declines, and (2) flatline temperature (FLT) where HR reaches zero. Mussels were heated in air at slow, moderate and fast rates, and HR was measured via an infrared sensor affixed to the shell. Faster heating rates significantly increased T crit in high-but not low-zone mussels, and T crit was higher in high-versus low-zone mussels, especially at the fastest heating rate. By contrast, FLT did not differ between zones, and was minimally affected by heating rate. As heating rate significantly impacted high-but not low-zone mussels' cardiac thermal tolerance, realistic zone-specific heating rates must be used in laboratory tests if those tests are to provide accurate information for ecological models attempting to predict the effects of increasing temperature on intertidal communities.

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“…temperature, pH, dissolved oxygen, or salinity) during the experiments. Under all treatments, mussels were fed a commercial shellfish diet (Shellfish Diet 1800, Reed Mariculture, Campbell, CA, USA) three to four times per week according to the manufacturer's instructions [31].…”

Section: Methodsmentioning

confidence: 99%

A single heat-stress bout induces rapid and prolonged heat acclimation in the California mussel,Mytilus californianus

et al. 2020

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Climate change is not only causing steady increases in average global temperatures but also increasing the frequency with which extreme heating events occur. These extreme events may be pivotal in determining the ability of organisms to persist in their current habitats. Thus, it is important to understand how quickly an organism's heat tolerance can be gained and lost relative to the frequency with which extreme heating events occur in the field. We show that the California mussel, Mytilus californianus —a sessile intertidal species that experiences extreme temperature fluctuations and cannot behaviourally thermoregulate—can quickly (in 24–48 h) acquire improved heat tolerance after exposure to a single sublethal heat-stress bout (2 h at 30 or 35°C) and then maintain this improved tolerance for up to three weeks without further exposure to elevated temperatures. This adaptive response improved survival rates by approximately 75% under extreme heat-stress bouts (2 h at 40°C). To interpret these laboratory findings in an ecological context, we evaluated 4 years of mussel body temperatures recorded in the field. The majority (approx. 64%) of consecutive heat-stress bouts were separated by 24–48 h, but several consecutive heat bouts were separated by as much as 22 days. Thus, the ability of M. californianus to maintain improved heat tolerance for up to three weeks after a single sublethal heat-stress bout significantly improves their probability of survival, as approximately 33% of consecutive heat events are separated by 3–22 days. As a sessile animal, mussels likely evolved the capability to rapidly gain and slowly lose heat tolerance to survive the intermittent, and often unpredictable, heat events in the intertidal zone. This adaptive strategy will likely prove beneficial under the extreme heat events predicted with climate change.

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Plasticity of thermal tolerance and its relationship with growth rate in juvenile mussels (Mytilus californianus)

Cited by 26 publications

References 66 publications

Mussels' acclimatization to high, variable temperatures is lost slowly upon transfer to benign conditions

Mussels' acclimatization to high, variable temperatures is lost slowly upon transfer to benign conditions

Impact of heating rate on cardiac thermal tolerance in the California mussel, Mytilus californianus

A single heat-stress bout induces rapid and prolonged heat acclimation in the California mussel,Mytilus californianus

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