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Miloch D, Cecchetto NR, Lescano JN, Leynaud GC, Perotti MG. Is thermal sensitivity affected by predation risk? A case study in tadpoles from ephemeral environments. J Exp Zool A Ecol Integr Physiol 2024; 341:400-409. [PMID: 38356256 DOI: 10.1002/jez.2793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 01/29/2024] [Accepted: 02/01/2024] [Indexed: 02/16/2024]
Abstract
Changes in environmental temperature may induce variations in thermal tolerance and sensitivity in ectotherm organisms. These variations generate plastic responses that can be analyzed by examining their Thermal Performance Curves (TPCs). Additionally, some performance traits, like locomotion, could be affected by other factors such as biological interactions (e.g., predator-prey interaction). Here, we evaluate if the risk of predation modifies TPCs in Mendoza four-eyed frog (Pleurodema nebulosum, Burmeister, 1861) and Guayapa's four-eyed frog (Pleurodema guayapae, Barrio, 1964), two amphibian species that occur in ephemeral ponds in arid environments. We measured thermal tolerances and maximum swimming velocity at six different temperatures in tadpoles under three situations: control, exposure to predator chemical cues, and exposure to conspecific alarm cues. TPCs were fitted using General Additive Mixed Models. We found that curves of tadpoles at risk of predation differed from those of control mainly in thermal sensitivity parameters. Our work confirms the importance of biotic interactions have in thermal physiology.
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Affiliation(s)
- Daniela Miloch
- Facultad de Ciencias Exactas, Físicas, y Naturales, Centro de Zoología Aplicada, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Diversidad y Ecología Animal, Consejo Nacional de Investigaciones Científicas y Técnicas, Córdoba, Argentina
| | - Nicolas R Cecchetto
- Instituto de Investigaciones en Biodiversidad y Medio Ambiente, Consejo Nacional de Investigaciones Científicas y Técnicas, Bariloche, Río Negro, Argentina
| | - Julián N Lescano
- Facultad de Ciencias Exactas, Físicas, y Naturales, Centro de Zoología Aplicada, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Diversidad y Ecología Animal, Consejo Nacional de Investigaciones Científicas y Técnicas, Córdoba, Argentina
| | - Gerardo C Leynaud
- Facultad de Ciencias Exactas, Físicas, y Naturales, Centro de Zoología Aplicada, Universidad Nacional de Córdoba, Córdoba, Argentina
- Instituto de Diversidad y Ecología Animal, Consejo Nacional de Investigaciones Científicas y Técnicas, Córdoba, Argentina
| | - María Gabriela Perotti
- Instituto de Investigaciones en Biodiversidad y Medio Ambiente, Consejo Nacional de Investigaciones Científicas y Técnicas, Bariloche, Río Negro, Argentina
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2
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Quiroga LB, Gordillo LF, Aragon-Traverso JH, Iribas FJ, Sanabria EA. Thermal sensitivity of Rhinella arenarum tadpole at low concentrations of dimethoate pesticides. Comp Biochem Physiol C Toxicol Pharmacol 2024; 279:109884. [PMID: 38437997 DOI: 10.1016/j.cbpc.2024.109884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 02/23/2024] [Accepted: 02/29/2024] [Indexed: 03/06/2024]
Abstract
One of the main causes of contamination of aquatic environments, which affects biotic communities, is the use of pesticides in agricultural regions. Amphibians are considered good bio-indicators of aquatic pollution, because they are one of the most susceptible groups to pollution. Several studies suggest that both pollution and climate change produce synergistic effects in amphibians which amplify the toxicity afecting survival, and malformations with an increase in temperature. We studied the sensitivity of sublethal concentrations of dimethoate in Rhinella arenarum tadpoles on two fitness related thermal traits including locomotor swimming performance and thermal tolerance limits (CTmax = critical thermal maximum and CTmin = critical thermal minimum). The locomotor performance of R. arenarum tadpoles decreased with increasing sublethal dimethoate concentrations up to ∼60 % at intermediates dimethoate concentration. The tadpoles showed a tendency to decrease their tolerance to high temperatures (CTmax) with increasing dimethoate concentration around ∼0.5 °C, however no significant differences were found among treatments. Similarly, tadpoles showed decreases in their cold resistance (CTmin) with dimethoate concentrations, around 1 °C the high concentrations of dimethoate. The increase of atypical climatic events, such as heat waves may put R. arenarum tadpoles at greater risk when exposed to dimethoate. Our results show that the sublethal concentrations of the dimethoate pesticide may affect the fitness and survival of the larvae of R. arenarum in natural, and seminatural enviroments.
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Affiliation(s)
- Lorena B Quiroga
- Instituto de Ciencias Básicas (ICB), Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. José Ignacio de la Roza 230 (O), Capital, CP 5400 San Juan, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, CP C1083ACA Ciudad Autónoma de Buenos Aires, Argentina
| | - Luciana F Gordillo
- Instituto de Ciencias Básicas (ICB), Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. José Ignacio de la Roza 230 (O), Capital, CP 5400 San Juan, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, CP C1083ACA Ciudad Autónoma de Buenos Aires, Argentina.
| | - Juan H Aragon-Traverso
- Instituto de Ciencias Básicas (ICB), Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. José Ignacio de la Roza 230 (O), Capital, CP 5400 San Juan, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, CP C1083ACA Ciudad Autónoma de Buenos Aires, Argentina
| | - Francisco J Iribas
- Instituto de Ciencias Básicas (ICB), Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. José Ignacio de la Roza 230 (O), Capital, CP 5400 San Juan, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, CP C1083ACA Ciudad Autónoma de Buenos Aires, Argentina
| | - Eduardo A Sanabria
- Instituto de Ciencias Básicas (ICB), Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. José Ignacio de la Roza 230 (O), Capital, CP 5400 San Juan, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Avenida Rivadavia 1917, CP C1083ACA Ciudad Autónoma de Buenos Aires, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Padre Jorge Contreras 1300, M5502JMA Mendoza, Argentina.
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3
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Gordillo L, Quiroga L, Ray M, Sanabria E. Changes in thermal sensitivity of Rhinella arenarum tadpoles (Anura: Bufonidae) exposed to sublethal concentrations of different pesticide fractions (Lorsban® 75WG). J Therm Biol 2024; 120:103816. [PMID: 38428105 DOI: 10.1016/j.jtherbio.2024.103816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 03/03/2024]
Abstract
The intensive use of agrochemicals and the rapid increase of global temperatures have modified the thermal conditions of aquatic environments, thus increasing amphibians' vulnerability to global warming and positioning them at great risk. Commercial formulations of chlorpyrifos (COM) are the pesticides most widely used in agricultural activities, with a high toxic potential on amphibians. However, little is known about the separate effects of the active ingredient (CPF) and adjuvants (AD). We studied the thermal sensitivity at different concentrations and pesticide fractions in Rhinella arenarum tadpoles, on thermal tolerance limits (CTmax = Critical thermal maximum and CTmin = Critical thermal minimum), swimming speed (Ss), Optimum temperature (Top), and Thermal breadth 50 (B50). Our results demonstrate that the pesticide active ingredient, the adjuvants, and the commercial formulation of chlorpyrifos differentially impair the thermal sensitivity of R. arenarum tadpoles. The pesticide fractions affected the heat and the cold tolerance (CTmax and CTmin), depending on the concentrations they were exposed to. The locomotor performance (Ss, Top, and B50) of tadpoles also varied among fractions, treatments, and environmental temperatures. In the context of climate change, the outcomes presented are particularly relevant, as mean temperatures are increasing at unprecedented rates, which suggests that tadpoles inhabiting warming and polluted ponds are currently experiencing deleterious conditions. Considering that larval stages of amphibians are the most susceptible to changing environmental conditions and the alarming predictions about environmental temperatures in the future, it is likely that the synergism between high temperatures and pesticide exposure raise the threat of population deletions in the coming years.
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Affiliation(s)
- Luciana Gordillo
- Instituto de Ciencias Básicas, Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. Ignacio de la Roza 230 (Oeste), (5400), San Juan, Argentina; CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.
| | - Lorena Quiroga
- Instituto de Ciencias Básicas, Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. Ignacio de la Roza 230 (Oeste), (5400), San Juan, Argentina; CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.
| | - Maribel Ray
- Instituto de Ciencias Básicas, Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. Ignacio de la Roza 230 (Oeste), (5400), San Juan, Argentina.
| | - Eduardo Sanabria
- Instituto de Ciencias Básicas, Facultad de Filosofía Humanidades y Artes, Universidad Nacional de San Juan. Av. Ignacio de la Roza 230 (Oeste), (5400), San Juan, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo. Padre Jorge Contreras 1300. (M5502JMA), Mendoza, Argentina; CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.
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Turriago JL, Tejedo M, Hoyos JM, Bernal MH. The effect of thermal microenvironment in upper thermal tolerance plasticity in tropical tadpoles. Implications for vulnerability to climate warming. J Exp Zool A Ecol Integr Physiol 2022; 337:746-759. [PMID: 35674344 DOI: 10.1002/jez.2632] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 04/09/2022] [Accepted: 05/06/2022] [Indexed: 06/15/2023]
Abstract
Current climate change is generating accelerated increase in extreme heat events and organismal plastic adjustments in upper thermal tolerances, (critical thermal maximum -CTmax ) are recognized as the quicker mitigating mechanisms. However, current research casts doubt on the actual mitigating role of thermal acclimation to face heat impacts, due to its low magnitude and weak environmental signal. Here, we examined these drawbacks by first estimating maximum extent of thermal acclimation by examining known sources of variation affecting CTmax expression, such as daily thermal fluctuation and heating rates. Second, we examined whether the magnitude and pattern of CTmax plasticity is dependent of the thermal environment by comparing the acclimation responses of six species of tropical amphibian tadpoles inhabiting thermally contrasting open and shade habitats and, finally, estimating their warming tolerances (WT = CTmax - maximum temperatures) as estimator of heating risk. We found that plastic CTmax responses are improved in tadpoles exposed to fluctuating daily regimens. Slow heating rates implying longer duration assays determined a contrasting pattern in CTmax plastic expression, depending on species environment. Shade habitat species suffer a decline in CTmax whereas open habitat tadpoles greatly increase it, suggesting an adaptive differential ability of hot exposed species to quick hardening adjustments. Open habitat tadpoles although overall acclimate more than shade habitat species, cannot capitalize this beneficial increase in CTmax, because the maximum ambient temperatures are very close to their critical limits, and this increase may not be large enough to reduce acute heat stress under the ongoing global warming.
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Affiliation(s)
- Jorge L Turriago
- Department of Biology, Grupo de Herpetología, Eco-Fisiología & Etología, Universidad del Tolima, Tolima, Colombia
- Programa de Doctorado en Ciencias Biológicas, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Miguel Tejedo
- Department of Evolutionary Ecology, Estación Biológica de Doñana, CSIC, Sevilla, Spain
| | - Julio M Hoyos
- Department of Biology, Grupo UNESIS, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Manuel H Bernal
- Department of Biology, Grupo de Herpetología, Eco-Fisiología & Etología, Universidad del Tolima, Tolima, Colombia
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Egea‐Serrano A, Alves MC, Solé M, Tejedo M. Upper thermal tolerances and vulnerability to global warming in a Brazilian Caatinga fish
Astyanax bimaculatus
(Linnaeus, 1758) population. AUSTRAL ECOL 2022. [DOI: 10.1111/aec.13207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Andrés Egea‐Serrano
- Departamento de Ciências Biológicas Universidade Estadual de Santa Cruz Ilhéus Brazil
| | - Maiara C. Alves
- Programa de Pós‐graduação em Zoología Universidade Estadual de Santa Cruz Ilhéus Brazil
| | - Mirco Solé
- Departamento de Ciências Biológicas Universidade Estadual de Santa Cruz Ilhéus Brazil
- Sektion Herpetologie Zoologisches Forschungsmuseum Alexander Koenig Bonn Germany
| | - Miguel Tejedo
- Departamento de Ecología Evolutiva Estación Biológica de Doñana‐CSIC Avda. Américo Vespucio 26 41092 Sevilla Spain
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Ferraro DP. Combined phylogenetic analysis of Pleurodema (Anura: Leptodactylidae: Leiuperinae). Cladistics 2022; 38:301-319. [PMID: 34985147 DOI: 10.1111/cla.12497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/14/2021] [Indexed: 11/29/2022] Open
Abstract
The genus Pleurodema comprises 15 species distributed through the Neotropical region, from sea level up to 5000 m.a.s.l. A total-evidence analysis of Pleurodema is provided based on the parsimony criterion. The combined dataset included morphometric, phenotypic, and DNA evidence (34 taxa, 4441 characters). The parsimony analysis yielded one most-parsimonious tree. Pleurodema was recovered as a well-supported clade composed of two major subclades. One subclade has an identical topology to that of previous analyses, the P. brachyops Clade (P. alium, P. borellii, P. brachyops, P. cinereum, P. diplolister, and P. tucumanum). The other subclade includes the remaining nine species of the genus, exhibiting a topology different from that of previous studies. According to the present phylogeny, this second lineage is formed by the P. nebulosum Clade (P. guayapae + P. nebulosum), P. marmoratum, the re-defined P. thaul Clade (P. bufoninum, P. somuncurense, P. thaul) and the P. bibroni Clade (P. bibroni, P. cordobae, P. kriegi). The reproductive modes of Pleurodema represent a unique combination of features within Leiuperinae, including three egg-clutch structures, two types of amplexus, and lack of vocalization. Also, some species of Pleurodema have been considered fossorial, because they are capable of digging with their hind-limbs and remaining in self-made burrows during dry seasons. The evolution of characters associated with reproductive biology and fossoriality is discussed in light of the obtained results.
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Affiliation(s)
- Daiana Paola Ferraro
- División Herpetología, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" -CONICET, Ángel Gallardo 470, Buenos Aires, C1405DJR, Argentina
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