MINI REVIEW article
Biologging Physiological and Ecological Responses to Climatic Variation: New Tools for the Climate Change Era
- 1Department of Neurobiology, Physiology and Behavior, University of California, Davis, Davis, CA, United States
- 2Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States
- 3Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK, United States
- 4Arctic Beringia Program, Wildlife Conservation Society, Fairbanks, AK, United States
In this mini-review, we discuss how biologging technology can be used to detect, understand, and forecast species' responses to climate change. We review studies of phenology, thermal biology, and microhabitat selection as examples to illustrate the utility of a biologging approach in terrestrial and aquatic species. These examples show that biologgers can be used to identify and predict behavioral and physiological responses to climatic variation and directional climate change, as well as to extreme weather events. While there is still considerable debate as to whether phenotypic plasticity is sufficient to facilitate species' responses to climate change or whether responses to short-term climate variability are predictive of climate change response, understanding the scope and nature of plasticity is an important step toward answering these questions. One advantage of the biologging approach is that it can facilitate the measurement of traits at the level of the individual, permitting research that investigates the degree to which physiology and behavior are plastic. As such, combining biologging with metrics of fitness can provide insight into how plasticity might confer population and species resilience to climate change. Increased use of biologgers in experimental manipulations will also yield important insight into how phenotypic flexibility allows some animals to mitigate the negative consequences of climate change. Although biologging studies to date have mostly functioned in measuring phenotypic responses to short-term climate variability, we argue that integrating biologging technology into long-term monitoring programs will be instrumental in documenting and understanding ecological responses to climate change.
Global climate change is rapidly affecting ecosystems worldwide by altering species' ranges, disrupting trophic interactions, and causing population declines. In addition to causing a rise in global mean temperatures and altering precipitation patterns (IPCC, 2014), anthropogenic climate change is affecting the frequency of climate events (e.g., El Niño and La Niña; Cai et al., 2014, 2015) and is predicted to increase the frequency and severity of extreme events (US Global Change Research Program, 2009; Holland and Bruyère, 2014). Understanding and predicting how these changes in the abiotic environment will alter ecosystems requires studying biological processes at multiple levels of organization, including within-individual physiological and behavioral adjustments (i.e., plasticity).
Detecting changes in species distribution and abundance with climate change requires long-term sampling. However, short-term observations of individual responses to climatic variation are often used as a proxy to predict consequences of long-term directional climate change. While there is still considerable debate regarding the relative contributions of phenotypic plasticity and evolution in climate change responses, and questions as to whether existing phenotypic plasticity is sufficient to respond to global climate change, understanding the scope of phenotypic plasticity in free-living animals is an important step toward resolving these debates (Merilä and Hendry, 2014). We argue that biologging individual responses to climate variability will likely be informative in developing predictions for climate change response, however it is important to acknowledge that climate change will affect biotic interactions across trophic levels and it is critical to take these possibilities into account when predicting species responses to climate change (Van der Putten et al., 2010). Unfortunately, direct observations of individual responses to climatic variation are often infeasible when individuals have large home ranges or use inaccessible environments. Even when individuals can be observed directly, some responses are cryptic and hard to observe using traditional methods. Although responses to manipulations of the physical or biological environment can be measured in laboratory or in semi-natural settings, these environments cannot reproduce the complexity of natural systems (Van der Putten et al., 2010). Biologging, the use of miniaturized animal-borne devices that log and/or relay data regarding an animal's movements, behavior, physiology and/or environment, offers a solution to these challenges (Rutz and Hays, 2009; Table 1). Biologgers can be deployed on free-living animals for extended periods and, when combined with monitoring of abiotic conditions, allow the detection of individual responses to biologically relevant environmental variation. With careful study design, they can also be used to quantify individual, population, and species-level variability in response to short-term climatic variation and long-term climate change. When deployed with experimental manipulations, they can reveal causal mechanisms. As such, they are an important tool in the climate change biologist's toolkit.
Table 1. Examples of biologgers frequently used in phenological studies, the research opportunities they provide, and trade-offs to be considered in their deployment.
In this mini-review, we show what biologging can offer climate change research by featuring case studies of phenology, thermal biology, and microhabitat selection. We focus on how biologging technology has extended our ability to measure the responses of free-ranging subjects to climatic variability, while highlighting the few studies that have documented responses to long-term directional climate change. Finally, we suggest how biologging could be utilized to advance the discipline.
Phenological shifts are widely documented responses to global climate change (Parmesan, 2007; Thackeray et al., 2010) and their potential to disrupt trophic interactions (Visser et al., 1998; Winder and Schindler, 2004; Post and Forchhammer, 2008) has led to concern that phenological mismatch may cause population declines (Both et al., 2010). Biologging can improve understanding of phenological responses to climate change by facilitating detection of cryptic seasonally-recurring life-cycle events (e.g., migration, hibernation, and reproduction) and study of the cues and proximate physiological mechanisms that regulate these transitions.
Novel applications of biologging are expanding as technological advances produce smaller devices with improved sensors, storage, and transmission capabilities. For example, temperature, activity, and/or GPS loggers are used to create precise timelines for implantation and/or parturition in a wide variety of mammals including brown bears (Ursus arctos) (Figure 1A; Table 1), woodland caribou (Rangifer tarandus caribou), sea otters (Enhydra lutris), and arctic ground squirrels (Urocitellus parryii) (Williams et al., 2011; Demars et al., 2013; Esslinger et al., 2014; Friebe et al., 2014; Bieber et al., 2017). GPS and light loggers can detect migration phenology in animals traveling on land, in water, or by air (Yasuda et al., 2010; Bailleul et al., 2012; Van Wijk et al., 2012; Lendrum et al., 2013; Cherry et al., 2016; Weller et al., 2016). In combination, temperature and light loggers can be used to identify dates of hibernation onset and termination in conjunction with immergence and emergence from dens or burrows (Figure 1B; Williams et al., 2011, 2017; Friebe et al., 2014). Since miniaturized biologging is a new tool, long-term phenological records collected from biologgers are sparse. However, shifts in timing have been identified in longitudinal studies in larger species (e.g., Bailleul et al., 2012; Hauser et al., 2017). For example, satellite telemetry data collected between 1993 and 2012 indicate that the Chukchi population of beluga whales (Delphinapterus leucas) are responding to later sea-ice formation by delaying autumn migration to the Bering Sea, while migration timing for the Beaufort population is not clearly related to freeze-up and remains unchanged (Hauser et al., 2017).
Figure 1. Data collected using biologgers can potentially be used to describe climate-driven changes in the phenology and/or occurrence of reproduction. (A) Elevated body temperatures and activity indicate implantation and gestation in female brown bears with an additional a peak in activity characterizing parturition (Friebe et al., 2014). (B) Female arctic ground squirrels re-enter hibernation and show unusually late and short bouts of torpor in response to late spring snow storms resulting in delayed parturition (Williams et al., 2017). Biologgers also show the thermal response of animals to extreme events. (C) Asian elephants in a warm environment depressed body temperature during the cooler periods of the day to provide a thermal reserve for high temperatures later in the day (shading represents mean +/− s.e.m) (Weissenbock et al., 2012). (D) A sugar glider enters torpor while experiencing heavy rains and high winds during a Category 1 cyclone (Nowack et al., 2015). Figures redrawn with permission.
Biologging and environmental data can also be combined to study the environmental cues that regulate phenological timing, allowing the prediction of responses under different climate change scenarios. For example, alignment of GPS collar migration data from polar bears (Ursus maritimus) with sea-ice extent data indicates that movement from ice to land is sensitive to local changes in sea-ice cover (Cherry et al., 2016). Similarly, bird migration can be delayed by extreme cold (Briedis et al., 2017) or drought (Tøttrup et al., 2012). These studies highlight the importance of explicitly addressing the role of extreme events in predictive models that assess the impacts of gradual long-term global warming on phenology.
A robust understanding of how environmental cues shape phenology will improve predictions of the extent to which plasticity will facilitate continued phenological adjustment to climate change. For example, biologging of body temperature (Tb) in the arctic ground squirrel has revealed sex differences in phenological flexibility: females extend hibernation in response to late spring snow whereas reproductive males do not (Figure 1B; Williams et al., 2017). Biologging has also uncovered migratory plasticity in response to environmental variation on wintering grounds (e.g., Ouwehand and Both, 2017) and along migratory corridors (e.g., Van Wijk et al., 2012). A novel analysis by Schmaljohann and Both (2017) used avian migratory tracks to estimate changes in arrival timing attributable to plasticity in migratory speed. They found that plasticity in migratory speed alone is unlikely to explain observed changes in arrival and suggested that changes in departure timing from wintering grounds, possibly due to evolution, may be responsible.
Biologging allows measurement of how thermal biology influences species performance and fitness (and thus range) in an era of climate change, as well as how organisms respond to thermal extremes and natural disasters.
Ectotherms: Connecting Performance and Species' Ranges
Ectotherms are particularly vulnerable to climate change due to the high thermal sensitivity of their metabolism, physiology, and life-history traits (Deutsch et al., 2008; Paaijmans et al., 2013). This sensitivity is reflected in thermal response curves which describe how trait performance is influenced by operative temperature (Top), a measure of the thermal environment that integrates convective and radiative heat transfer on a scale relevant to an animal's microhabitat (Sinclair et al., 2016). Biologging permits the assessment of how environmental changes influence thermal performance, and consequently alter species' distributions. For example, Gannon et al. (2014) used accelerometers to gauge performance in free-living dusky flathead (Platycephalus fuscus) and showed that the temperature-dependence of performance likely limits the biogeography of this predatory fish. Using the same approach, Payne et al. (2016) demonstrated that warming tolerance is lower in species with more tropical range limits, consistent with captive studies that indicate low-latitude fishes are more sensitive to ocean warming than species that occupy higher-latitudes (Rummer et al., 2014). The shape of performance curves, however, may differ among traits and thus accelerometry alone cannot provide a complete understanding of how warming will influence biogeography. Heart rate predicts the thermal dependence of metabolism better than activity (Clark et al., 2010), suggesting a role for additional sensors in understanding how thermal limits and performance influence range shifts. Additionally, biologgers may play a crucial role in quantifying changes in thermal performance through acclimatization (i.e., physiological flexibility) and/or developmental plasticity, as well as documenting genetic variation in thermal performance (Kingsolver, 2009; Gaitán-Espitia et al., 2014), which are key aspects of population and species resilience to environmental change (Somero, 2010; Seebacher et al., 2015).
Endotherms: Responding to Aridity and Thermal Extremes
Given the indirect relationship between operative temperature and metabolism in endotherms, they are thought to be somewhat buffered from the direct effects of increasing temperatures (Khaliq et al., 2014). Nevertheless, endotherms in hot arid environments may be vulnerable to climate change since increases in temperature or aridity can cause dehydration from evaporative cooling and overwhelm heat dissipation capacity. Indeed, temperature and aridity can have sublethal fitness costs and even cause direct mortality in birds and mammals (Speakman and Krol, 2010; Du Plessis et al., 2012). Biologging facilitates the measurement of the physiological and behavioral responses endotherms use to cope with high temperatures and aridity, as well as the identification of physiological limits that may shape responses to climate change.
Endotherms that maintain relatively constant Tb (i.e., “homeotherms”) can cope with hot arid conditions by deviating from homeothermy. Captive studies indicate that small birds reduce water loss under hot conditions by becoming hyperthermic, reducing the differential between Tb and Top (reviewed in Tieleman and Williams, 1999). Although it has long been hypothesized that desert birds should facilitate passive heat loss and conserve water loss by maintaining a higher Tb set-point (Withers and Williams, 1990), a compilation of laboratory data from 28 species failed to find a difference in the thermal responses of desert and non-desert species (Tieleman and Williams, 1999). However, a recent field-based biologging study by Smit et al. (2013) found that even within a species, desert-dwelling birds have higher Tb set-points than individuals from a population in a wetter, semi-desert region. This highlights the utility of the biologging approach, as the physiology of animals in laboratory conditions may not be representative of physiology in nature.
Biologging studies reveal that large mammals also exhibit hyperthermia in response to high temperatures and aridity. However, unlike small mammals, large mammals benefit from a lower daily minimum Tb as their larger size provides them with high thermal inertia, which creates a thermal reserve for heat storage (reviewed in Hetem et al., 2016). Later in the day, animals allow Tb to rise, reducing water loss by decreasing the differential between Tb and Top. This pattern is particularly extreme in oryx (Oryx leucoryx), which alter Tb by more than 4°C across the day in summer but only 1.5°C in winter (Ostrowski et al., 2003; Hetem et al., 2010), although it is also evident in Asian elephants (Elephas maximus; Figure 1C Weissenbock et al., 2012). In addition to changes in core Tb, some endotherms selectively cool regions of the brain (Midtgård, 1983; Mitchell et al., 2002; Fuller et al., 2016). Although initially demonstrated under laboratory conditions and interpreted as an adaptation to reduce the negative effects of heat stress, technological advancements that allowed blood and brain temperatures to be measured in free-living ungulates demonstrated that selective brain cooling reduces evaporative water loss, rather than preventing hyperthermia (Jessen et al., 1994; Mitchell et al., 1997; Fuller et al., 2007). In sum, biologging Tb in free-living endotherms has already provided insight into the physiological mechanisms that may allow some species to cope with increased temperatures associated with climate change. For most species, however, the physiological limits to warming are not well described and more work is needed to link utilization of heterothermy to fitness consequences in free-living populations.
Endotherms: Responding to Natural Disasters
Climate change is increasing mean temperature, as well climatic variation, leading to more frequent extreme temperature and precipitation events and natural disasters (Easterling et al., 2000; Alexander et al., 2006; Mitchell et al., 2006). Biologging has revealed that heterothermic endotherms (i.e., those that use daily torpor and/or hibernation; Ruf and Geiser, 2015) can depress their metabolism to buffer themselves from unpredictable energetic bottlenecks and/or natural disasters (Nowack et al., 2017). For example, small mammals can substantially reduce their energy consumption following late spring snowstorms, cyclones, or wildfire by entering torpor (Figure 1D; Willis et al., 2006; Nowack et al., 2015, 2016; Stawski et al., 2015). Thus, biologging indicates that facultative torpor and/or hibernation may buffer some endotherms from extreme events, analogous to how facultative migrations are used in other species (Streby et al., 2015).
Microclimates can provide animals with a wider range of environmental temperatures than are available on a macroclimatic scale (Scheffers et al., 2014) and utilization of microhabitats through behavioral thermoregulation may provide a means for some species to cope with climate change. Biologging allows direct measurement of an animal's experienced environment which can be compared with remotely sensed data of available habitat to investigate how microclimates influence species' ranges. For example, biologged Tb and ambient temperature (Ta) coupled with spatial telemetry data have revealed that habitat use at northern range limits is thermally constrained for a variety of ectotherms including wood turtles (Glyptemys insculpta; Dubois et al., 2009), loggerhead turtles (Caretta caretta; Schofield et al., 2009), and black rat snakes (Elaphe obsoleta obsolete; Blouin-Demers and Weatherhead, 2002). Such studies have the potential to reveal how microhabitat availability and selection influence species' ranges under climate change. To date however, long-term biologging studies that span wide latitudinal gradients are lacking, limiting our understanding of the factors influencing range shifts under climate change.
Ectotherms and endotherms may cope with climate change through the exploitation of spatiotemporal variation in temperature within existing home-ranges. Recent biologging studies reveal that ectotherms can partition daily and seasonal activities across thermally variable microhabitats to alter metabolic rate (e.g., Dubois et al., 2009; Harrison et al., 2016). For example, blacktip reef sharks (Carcharhinus melanopterus) are warmest, but least active, during the day as they move into warm water to increase rates of digestion; they peak in activity while cooling in evenings, since they forage when they have a sensory advantage under low light conditions and a thermal advantage over prey with lower thermal inertia (Papastamatiou et al., 2015). Similarly, biologging in terrestrial birds and small mammals indicates they utilize thermal refugia during periods of high heat and partition demanding activities, such as foraging, to cooler times of day when risk of dehydration is lower (e.g., Martin et al., 2015; Levy et al., 2016). Microhabitat partitioning across the day may be important as climate change is having different effects on daytime and nighttime temperatures (Easterling et al., 1997).
Microhabitat partitioning can also occur on seasonal time-scales. For example, biologgers revealed that female loggerhead turtles seek out warm water areas to accelerate egg development (Fossette et al., 2012). During winter, collar-mounted temperature loggers have been used to investigate the use of nests and burrows as refugia from cold temperatures and harsh winds in red squirrels (Tamiasciurus hudsonicus; Studd et al., 2016) and opossums (Didelphis virginiana; Kanda et al., 2005). In female polar bears, biologgers were used to both identify incidences of reproductive denning and characterize the microhabitats and substrates preferred by bears for denning, the availability of which may be altered by climate change and human development (Olson et al., 2017). The continued miniaturization of biologgers will open new avenues of research. For example, while nest cavity microclimate variation is known to be an important determinant of nestling growth and survival (Catry et al., 2011; Campobello et al., 2017), biologging may prove useful in understanding how micro-climate influences adult physiology and incubation/provisioning behaviors or nestling post-fledging behavior/survival (e.g., Nord and Nilsson, 2011).
A Note of Caution
Despite the power and potential of biologging for monitoring responses to climatic variability/change, serious consideration must be given to its potential to alter the physiological and/or behavioral parameters being measured, or negatively affect the survival and reproductive output of the tagged individual (White et al., 2013; Bodey et al., 2018). Careful consideration must be given to the size, mass, shape, buoyancy, and attachment method of the device, balancing the ecological insight that is provided with the potential deleterious effects (Wilson et al., 2015). Further, researchers need to weigh the benefits of using minimally-invasive external attachment approaches with the potential reduction in negative effects that can be achieved through implantation (Bodey et al., 2018).
Conclusion and Future Directions
Biologging is broadly useful for investigating individual, population, and species responses to global climate change, including changes in the frequency of extreme climatic events. Although by no means an exhaustive review, the studies of phenology, thermal biology, and microhabitat selection that we discuss illustrate how biologging approaches can be used to uncover both physiological and behavioral responses to climate change. In cases where longitudinal data are not yet available, biologging studies have already made important contributions to the field by linking environmental variation to alterations in physiology and behavior, which facilitates predictions of climate change response. We caution, however, that predictions may fail if they are based solely on the direct effects of climate variability on individual species, as fitness is strongly influenced by interactions between species (Gilman et al., 2010).
We propose that biologging can contribute further to the field by addressing knowledge gaps and providing new methodological approaches. Research opportunities include (1) connecting biologged behavioral and physiological responses to fitness outcomes, (2) quantifying variation in behavioral and physiological responses across individuals, populations, and species for use in predictive models of plastic and evolutionary responses to climate change, and (3) increasing the use of biologgers in field-based experiments to determine the physiological mechanisms that underlie observed responses to climate variation. With the increasing miniaturization of biologgers, deployment in an ever-growing breadth of taxa, and maturation of longitudinal biologging datasets, we predict that biologging will continue to influence the study of global climate change.
All authors contributed to the review through development of ideas, drafting of initial text, and providing feedback for revisions. HC coordinated revisions amongst authors and prepared figures and CW initiated the project.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
CW acknowledges funding from the National Science Foundation grant (IOS-1558056). HC acknowledges salary support from the UC Davis Animal Behavior Graduate Group and an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under grant number P20GM103395. The content is solely the responsibility of the authors and does not necessarily reflect the official views of the NIH or NSF.
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Keywords: phenology, microhabitat selection, thermal biology, biologger, climate change
Citation: Chmura HE, Glass TW and Williams CT (2018) Biologging Physiological and Ecological Responses to Climatic Variation: New Tools for the Climate Change Era. Front. Ecol. Evol. 6:92. doi: 10.3389/fevo.2018.00092
Received: 19 December 2017; Accepted: 11 June 2018;
Published: 03 July 2018.
Edited by:Thomas Wassmer, Siena Heights University, United States
Reviewed by:Daniela Campobello, Università degli Studi di Palermo, Italy
Simon Verhulst, University of Groningen, Netherlands
Graeme Clive Hays, Deakin University, Australia
Copyright © 2018 Chmura, Glass and Williams. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Cory T. Williams, email@example.com