Endocrine and metabolic impacts of warming aquatic habitats: differential responses between recently isolated populations of a eurythermal desert pupfish

Lema, Sean C.; Chow, Michelle I.; Resner, Emily J.; Westman, Alex A.; May, Darran; Dittman, Andrew H.; Hardy, Kristin M.

doi:10.1093/conphys/cow047

Cited by 11 publications

(5 citation statements)

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“…Global warming will seriously affect the physiological homeostasis of a wide variety of animals, especially as temperatures reach species upper thermal tolerance limits (Bozinovic & Pörtner, 2015; Silva et al, 2015; Somero, 2010). These effects are a particular cause for concern in ectotherms such as marine invertebrates (Johnson & Hofmann, 2020; Lefevre, 2016; Stuart‐Smith et al, 2015), insects (Sales et al, 2018; Zeuss et al, 2014), fishes (Alfonso et al, 2021; Lema et al, 2016; Weber et al, 2015), amphibians (Rohr & Palmer, 2013; Scheffers et al, 2013; Thurman & Garcia, 2017), and reptiles (Nowakoski et al, 2020; Rodgers et al, 2015; Sinervo et al, 2010) because elevated temperatures not only increase metabolic rate (Garcia‐Robledo et al, 2020) but also initiate changes in behavior (Gibert et al, 2016). For example, ectotherms may invest large amounts of time and energy moving between places to maintain their body temperatures within a specific range of temperatures, thereby attempting to optimize physiological processes (Ohlberger, 2013; Rolland et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Temperature and barometric pressure affect the activity intensity and movement of an endangered thermoconforming lizard

et al. 2022

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Global warming is expected to affect movement-related thermoregulation in ectotherms, but the likely effects on thermoconforming lizards, which spend little energy in thermoregulation behavior, are unclear. We used the Guatemalan beaded lizard (Heloderma charlesbogerti) as a model thermoconforming species to investigate the effects of ambient temperature and barometric pressure (a cue for rain in the study area) on activity intensity and the structure of movement paths. We tracked 12 individuals over a total of 148 animal days during the wet season of 2019 using Global Positioning System tags and triaxial accelerometry. We found a clear positive effect of ambient temperature on activity (using vectorial dynamic body acceleration [VeDBA]) and step length of lizard movements. The movement also became more directional (longer step lengths and smaller turning angles) with increasing ambient temperatures. There was a small negative effect of barometric pressure on VeDBA. We propose that our patterns are indicative of internal state changes in the animals, as they move from a state of hunger, eliciting foraging, which is enhanced by lower temperatures and rainfall to a thermally stressed state, which initiates shelter-seeking. Our findings highlight the sensitivity of this species to temperature change, show that not all thermoconforming lizards are thermal generalists, and indicate that predicted regional increases in temperature and reduction in rainfall are likely to negatively impact this species by reducing the width of their operational thermal window.

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Section: Introductionmentioning

confidence: 99%

Temperature and barometric pressure affect the activity intensity and movement of an endangered thermoconforming lizard

et al. 2022

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“…While it is not known if DO conditions changed in Tecopa Bore between 2008 and 2013-2014, or if consistent exposure to low DO alone can induce the development of morphological traits mirroring those observed for pupfish in Tecopa Bore, it is well established that hypoxia can depress metabolic rate [38] and increase the expression of less-efficient metabolic pathways involving anaerobic enzymes such as lactate dehydrogenase (LDH) [39,40], with responses varying both with hypoxia duration and taxonomically [41,42]. Muscle LDH activity measured in pupfish collected from Tecopa Bore in 2014 was approximately 2× higher than in conspecifics from the Amargosa River, suggesting heightened anaerobic capacity [43]. Interestingly, C. nevadensis acclimated to 33°C can even cease O 2 consumption entirely for more than 2 h, during which time anaerobic pathways producing ethanol appear to be used [44].…”

Section: Resultsmentioning

confidence: 95%

Warming waters beget smaller fish: evidence for reduced size and altered morphology in a desert fish following anthropogenic temperature change

et al. 2019

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Poikilothermic organisms are predicted to show reduced body sizes as they experience warming environments under a changing global climate. Such a shrinking of size is expected under scenarios where rising temperatures increase cellular reaction rates and basal metabolic energy demands, therein requiring limited energy to be shifted from growth. Here, we provide evidence that the ecological changes associated with warming may not only lead to shrinking body size but also trigger shifts in morphology. We documented 33.4 and 39.0% declines in body mass and 7.2 and 7.6% reductions in length for males and females, respectively, in a wild population of Amargosa pupfish, Cyprinodon nevadensis amargosae , following an abrupt anthropogenically driven temperature increase. That reduction in size was accompanied by the partial or complete loss of paired pelvic fins in approximately 34% of the population, a morphological change concomitant with altered body dimensions including head size and body depth. These observations confirm that increasing temperatures can reduce body size under some ecological scenarios and highlight how human-induced environmental warming may also trigger morphological changes with potential relevance for fitness.

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“…Recent studies disclosed that the expression of particular estrogen receptors was declined at higher temperatures (34 °C) in Amargosa Pupfish (Cyprinodon nevadensis amargosae) females. Similarly, elevated temperature distinctly suppressed liver estrogen receptors in Tecopa pupfish (Cyprinodon nevadensis calidae) females 43, 44 .…”

Section: Impacts Of Thermal Stress On Aquatic Organisms Populations A...mentioning

confidence: 99%

Divergent perspectives on the synergistic impacts of thermal-chemical stress on aquatic biota within the framework of climate change scenarios

Fathy

2024

Chemosphere

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Endocrine and metabolic impacts of warming aquatic habitats: differential responses between recently isolated populations of a eurythermal desert pupfish

Cited by 11 publications

References 103 publications

Temperature and barometric pressure affect the activity intensity and movement of an endangered thermoconforming lizard

Temperature and barometric pressure affect the activity intensity and movement of an endangered thermoconforming lizard

Warming waters beget smaller fish: evidence for reduced size and altered morphology in a desert fish following anthropogenic temperature change

Divergent perspectives on the synergistic impacts of thermal-chemical stress on aquatic biota within the framework of climate change scenarios

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