Does heat tolerance actually predict animals' geographic thermal limits?

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 917, P. 170165 - 170165

Published: Jan. 21, 2024

The "climate extremes hypothesis" is a major assumption of geographic studies heat tolerance and climatic vulnerability. However, this remains vastly untested across taxa, multiple factors may contribute to uncoupling limits. Our dataset includes 1000 entries data maximum temperatures for each species' known limits (hereafter, Tmax). We gathered information animal including marine fish, terrestrial arthropods, amphibians, non-avian reptiles, birds, mammals. first tested if constrains the Tmax sites where species could be observed. Secondly, we strength such restrictions depends on how high relative tolerance. Thirdly, correlated different estimates among them species. Restrictions are strong birds but often weak or inconsistent reptiles Marine fish describe non-linear relationship that contrasts with groups. Traditional measures in thermal vulnerability studies, like panting upper set point preferred temperatures, do not predict inversely it, respectively. Heat restricts warm edges more strongly reach higher their These emerging patterns underline importance reliable indexes identify at range edges. Besides, tight correlations on-land microhabitats support view types challenges simultaneously shaping ranges' heterogeneous correlation ocean supports thermoregulation generally limited, too. propose new hypotheses understand distribution.

Language: Английский

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Lizard thermal physiology drives abundance peaks along climate gradients, but only weakly predicts distributional limits

The American Naturalist, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Language: Английский

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Acclimation capacity to global warming of amphibians and freshwater fishes: Drivers, patterns, and data limitations

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(5)

Published: May 1, 2024

Abstract Amphibians and fishes play a central role in shaping the structure function of freshwater environments. These organisms have limited capacity to disperse across different habitats thermal buffer offered by systems is small. Understanding determinants patterns their physiological sensitivity life history is, therefore, imperative predicting impacts climate change systems. Based on systematic literature review including 345 experiments with 998 estimates 96 amphibian (Anura/Caudata) 93 fish species (Teleostei), we conducted quantitative synthesis explore phylogenetic, ontogenetic, biogeographic (thermal adaptation) upper tolerance (CT max ) acclimation (acclimation response ratio, ARR) as well influence methodology used assess these traits using conditional inference tree analysis. We found globally consistent CT ARR, phylogeny (taxa/order), experimental methodology, climatic origin, stage significant traits. The analysis demonstrated that does not primarily depend origin but temperature duration, stage. Higher temperatures longer times led higher values, whereby Anuran larvae revealed than older stages. ARR was more twice amphibians. Differences between stages were significant. In addition phylogenetic differences, also depended ramping rate, adaptation local variability. However, amount data early too small, methodologically inconsistent, phylogenetically unbalanced identify potential cycle bottlenecks We, propose methods improve robustness comparability /ARR stages, which crucial for conservation biodiversity under change.

Language: Английский

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The time course of acclimation of critical thermal maxima is modulated by the magnitude of temperature change and thermal daily fluctuations

Journal of Thermal Biology, Journal Year: 2023, Volume and Issue: 114, P. 103545 - 103545

Published: May 1, 2023

Language: Английский

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Systematics of the Dendropsophus leucophyllatus species group (Anura, Hylidae) from the Chocó region of Ecuador, with description of a new species

Evolutionary Systematics, Journal Year: 2025, Volume and Issue: 9(1), P. 7 - 31

Published: Feb. 21, 2025

The Dendropsophus leucophyllatus group is composed by 19 species distributed from Central America to the Atlantic Forest of Brazil. Only one known Chocó region, D. ebraccatus , which also in America. Previous studies suggested existence two masked under “ ”. only other lowlands Ecuador gryllatus an elusive never included phylogenetic analyses. In present study, we review systematics both based on morphological, genetic, and bioacoustic data. For analyses, sequenced four mitochondrial genes (12S, 16S, COI, ND1, including flanking tRNAs) nuclear (TYR, POMC). Our results indicate that populations ” represent a new species, not most closely related America, but . inhabits tropical rainforest piedmont evergreen forest NW SW Colombia. Populations differ having larger body size presence hourglass-shaped dorsal mark. differs absence clear band eye, well defined spots distinct advertisement call. Both appear be allopatric and, according our time-tree, diverged each during late Pliocene.

Language: Английский

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Three new species of torrent treefrogs (Anura, Hylidae) of the Hyloscirtus bogotensis group from the eastern Andean slopes and the biogeographic history of the genus

ZooKeys, Journal Year: 2025, Volume and Issue: 1231, P. 233 - 292

Published: March 13, 2025

The Hyloscirtus bogotensis group contains 17 species of treefrogs from the tropical Andes and Central America. A taxonomic review Amazonian clades this is presented based on DNA sequences nuclear mitochondrial a preliminary phylogenomic analysis ultraconserved elements, as well morphological, bioacoustic, environmental characters. Additionally, role in diversification genus explored by reconstructing their ancestral basin (Amazon, Pacific, Caribbean). Our integrative indicates existence eight undescribed candidate within group. Three those are described, previously masked H. albopunctulatus , phyllognathus torrenticola . lectotype also designated for Hyla albopunctulata new evidence suggests that neither nor occur Ecuador. species, elbakyanae sp. nov. dispersus maycu differ other members bioacoustics external morphology. most useful diagnostic characters among were advertisement calls. In contrast, skin coloration highly variable intraspecifically and, result, low value. High variation color partly result phenotypic plasticity. biogeographic reconstructions indicate Andean barrier influenced Since early Oligocene, there have been only four colonization events across de Andes, between Pacific Amazon basins. Two occurred more than 14 Mya, when below 3000 m. Species highland larinopygion younger, suggesting recent high montane forests paramo habitats emerged.

Language: Английский

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Within-reach temperature heterogeneity is limited in a southern Appalachian stream network, southeastern USA

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133127 - 133127

Published: March 1, 2025

Language: Английский

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Novel physiological data needed for progress in global change ecology

Basic and Applied Ecology, Journal Year: 2023, Volume and Issue: 67, P. 32 - 47

Published: Jan. 26, 2023

Studies examining the underlying causes of distributions species and their future trajectories under climate change have benefitted from accumulation measurements thermal tolerance across tree life. However, gaps in global coverage heat-tolerance data for ectotherms persist on four critical fronts. First, most large-scale analyses treat heat as a fixed trait despite that population-level variation can equal or exceed cross-species variation. Second, terrestrial non-arthropod invertebrates aquatic other than bony fish been poorly sampled, particularly boreal tropical regions, Indian Ocean mesopelagic-deep ocean. Third, study impacts has often neglected interaction environmental temperatures with water availability. And fourth, mechanisms driving dependence oxygen supply-demand remain largely unknown. We contend filling those knowledge requires novel strategies ecophysiological sampling range understudied populations occupy length climatic gradients globally. Such developments are essential comprehensively predicting responses to biomes.

Language: Английский

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Linking physiology and climate to infer species distributions in Australian skinks

Journal of Animal Ecology, Journal Year: 2023, Volume and Issue: 92(10), P. 2094 - 2108

Published: Sept. 3, 2023

Abstract Climate has a key impact on animal physiology, which in turn can have profound influence geographic distributions. Yet, the mechanisms linking climate, physiology and distribution are not fully resolved. Using an integrative framework, we tested predictions of climatic variability hypothesis (CVH), states that species with broader distributions physiological tolerance than range‐restricted species, group Lampropholis skinks (8 196 individuals) along latitudinal gradient eastern Australia. We investigated several aspects including metabolism, water balance, thermal thermoregulatory behaviour ecological performance. Additionally, to test whether organismal information (e.g. physiology) enhance models, hence providing evidence climate interact shape range sizes, models incorporating better predict sizes using solely layers. In agreement CVH, our results confirm widespread tolerate perform at temperature ranges species. also found differences field body temperatures, but preference, between However, metabolism balance did correlate size. Biophysical modelling revealed incorporation behavioural data improves compared based macroclimatic inputs, mainly for By integrating niche ectothermic animals, study provides correlates Physiological responses central establishing skinks, processes occurring local scales behaviour) improve models.

Language: Английский

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Intraspecific variation of thermal tolerance in freshwater insects along elevational gradients: the case of a widespread diving beetle

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: March 7, 2024

Species distributed along wide elevational gradients are likely to experience local adaptation and exhibit high plasticity of thermal tolerance traits, as these characterised by steep environmental changes over short geographic distances (i.e., strong selection differentials). However, the prevalence adaptive clinal intraspecific variation in with elevation remains unclear, this aspect has been poorly studied freshwater insects. We explored upper (heat coma temperature) lower (supercooling point) limits acclimation capacity among Iberian populations widespread aquatic beetle Agabus bipustulatus (fam. Dytiscidae) across a 2,000-m gradient, from lowland alpine areas. As minimum, maximum mean temperatures decline elevation, we predicted that higher will show heat tolerances cold tolerances. also whether is positively related climatic variability different elevations. found significant A. bipustulatus, but no evidence conditions altitudinal relationships between or variables were general not significant. Plasticity was overall consistently low all populations. These results suggest conservatism niche, which might be result gene flow counteracting effects divergent selection, adaptations other traits buffer exposure climate extremes. The limited potential here for imply even generalist species, gradients, may have little resilience global warming.

Language: Английский

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