Interactions between rates of temperature change and acclimation affect latitudinal patterns of warming tolerance

Allen, Jessica L.; Chown, Steven Loudon; Janion‐Scheepers, Charlene; Clusella‐Trullas, Susana

doi:10.1093/conphys/cow053

Cited by 61 publications

(57 citation statements)

References 82 publications

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“…A better understanding of the potential role of thermal tolerance in past and future responses of bumblebees to changing climates requires an easily implemented approach to measuring thermal tolerance that is also clearly tied to organism physiology and knowledge of plasticity of thermal tolerance over short timescales (Allen et al, 2016). Here, we validate a new high-throughput method for measurement of CT min and CT max in bumblebees.…”

Section: Introductionmentioning

confidence: 95%

Critical thermal limits of bumble bees (Bombus impatiens) are marked by stereotypical behaviors and are unchanged by acclimation, age, or feeding status

Oyen

Dillon

2018

Journal of Experimental Biology

113

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Critical thermal limits often determine species distributions for diverse ectotherms and have become a useful tool for understanding past and predicting future range shifts in response to changing climates. Despite recently documented population declines and range shifts of bumblebees (genus ), the few measurements of thermal tolerance available for the group have relied on disparate measurement approaches. We describe a novel stereotypical behavior expressed by bumblebee individuals during entry into chill coma. This behavioral indicator of minimum critical temperature (CT) occurred at ambient temperatures of 3-5°C (approximately 7-9°C core temperatures) and was accompanied by a pronounced CO pulse, indicative of loss of spiracle function. Maximum critical temperature (CT) was indicated by the onset of muscular spasms prior to entering an unresponsive state and occurred at ambient temperatures of approximately 52-55°C (42-44°C core temperatures). Measurements of CT and CT were largely unaffected by acclimation, age or feeding status, but faster ramping rates significantly increased CT and decreased CT This high-throughput approach allows rapid measurement of critical thermal limits for large numbers of individuals, facilitating large-scale comparisons among bumblebee populations and species - a key step in determining current and future effects of climate on these critical pollinators.

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Section: Introductionmentioning

confidence: 95%

Critical thermal limits of bumble bees (Bombus impatiens) are marked by stereotypical behaviors and are unchanged by acclimation, age, or feeding status

Oyen

Dillon

2018

Journal of Experimental Biology

113

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“…A recent work, particularly focused on predicting the thermal acclimation capacity of ectotherms across many different species, body sizes, latitudes, traits, and habitats, also includes the effect of ramping rate as one of the variables, but only at the interspecific level and at the high temperature end [24]. However, the study uses an interspecific approach, which confounds intraspecific with interspecific variation, assuming, in contrast to existing empirical data [8][9][10][11], that rate effects at the two levels have similar magnitudes and take the same form, and leaving the effect of ramping rate on the extent of variation of both CT max and CT min at the intraspecific level unexplored.…”

Section: Introductionmentioning

confidence: 99%

Rate dynamics of ectotherm responses to thermal stress

2019

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Critical thermal limits (CTLs) show much variation associated with the experimental rate of temperature change used in their estimation. Understanding the full range of variation in rate effects on CTLs and their underlying basis is thus essential if methodological noise is not to overwhelm or bias the ecological signal. We consider the effects of rate variation from multiple intraspecific assessments and provide a comprehensive empirical analysis of the rate effects on both the critical thermal maximum (CT max ) and critical thermal minimum (CT min ) for 47 species of ectotherms, exploring which of the available theoretical models best explains this variation. We find substantial interspecific variation in rate effects, which takes four different forms (increase, decline, no change, mixed), with phylogenetic signal in effects on CT max , but not CT min . Exponential and zero exponential failure rate models best explain the rate effects on CT max . The majority of the empirical rate variation in CT min could not be explained by the failure rate models. Our work demonstrates that rate effects cannot be ignored in comparative analyses, and suggests that incorporation of the failure rate models into such analyses is a useful further avenue for exploration of the fundamental basis and implications of such variation.

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“…While warming tolerance (sensitivity) is actively studied and discussed worldwide (38)(39)(40)(41), such studies are practically limited by lack of consistent knowledge about plant functional traits. Particularly, data on tolerance to warming are missing in existing plant trait databases, and data on tolerances to fire and drought are available only for about 1.7% and 0.95% of all accepted taxonomic names of vascular plant species, respectively (27,42).…”

Section: Discussionmentioning

confidence: 99%

Persistence of remnant boreal plants in the Chiricahua Mountains, southern Arizona

Fescenko

Downer

Fescenko³

2020

Preprint

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Boreal plants growing along southern edge of their range on isolated mountains in a hot desert matrix live near the extreme of their physiological tolerance. Such plants are considered to be sensitive to small changes in climate. We coupled field observations (1974, 1993, 2019) about the abundance and vigor of small populations of ten remnant boreal plant species persisting in uppermost elevation spruce-fir forests of the Chiricahua Mountains, together with a theoretical modeling of the species' tolerances to three climate change cues: warming, drought, and forest fire, in order to explore the persistence of frontier boreal plant species in the frame of climate changes. We hypothesized that populations of these cryophilic plants have declined or become locally extinct during an adverse warming period since 1993, enforced by two large forest fires (1994, 2011). We used plant functional traits and principal component analysis to model tolerances of the plants to combined actions of warming, drought, and forest fire. Our model predicted selective sensitivity to warming for two species: Vaccinium myrtillus and Rubus parviflorus, while possible decline of the other species could be explained by drought and/or fire. We surveyed the study area in 2019 and found eight of the ten species still occur in the area. Five species occurred in wet canyons at lower elevations, but three species persisted in low vigor at the uppermost elevation highly affected by fires. Both warming-sensitive species did not show signs of decline: population of R. parviflorus increased in abundance and vigor, while V. myrtillus persists without significant changes since 1993. Despite the recorded increase in temperature in the study area over one degree Celsius between years 1975Celsius between years -1993Celsius between years and 1994Celsius between years -2019, our study did not find evidence of the direct warming effect on the observed species. We conclude that severe wildfires and multi-decadal decrease in precipitation rather than warming are the main limiting factors of the remnant boreal species' remarkable but limited persistence in the Chiricahua Mountains. Our study demonstrates how field observations can be combined with modeling to evaluate species selective responses to different environmental stresses for better environmental management decisions, particularly in light of climate change. Keywords -climate warming | drought | forest fire | plant functional traits | remnant boreal plants | warming toleranceCorrespondence: anda.fescenko@gmail.com

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Interactions between rates of temperature change and acclimation affect latitudinal patterns of warming tolerance

Cited by 61 publications

References 82 publications

Critical thermal limits of bumble bees (Bombus impatiens) are marked by stereotypical behaviors and are unchanged by acclimation, age, or feeding status

Critical thermal limits of bumble bees (Bombus impatiens) are marked by stereotypical behaviors and are unchanged by acclimation, age, or feeding status

Rate dynamics of ectotherm responses to thermal stress

Persistence of remnant boreal plants in the Chiricahua Mountains, southern Arizona

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