Pub Date : 2023-11-22DOI: 10.1163/15685381-440402seh
{"title":"Report of the Treasurer 2022","authors":"","doi":"10.1163/15685381-440402seh","DOIUrl":"https://doi.org/10.1163/15685381-440402seh","url":null,"abstract":"","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"154 9","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139248833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-14DOI: 10.1163/15685381-bja10159
Keigo Takahashi
Buergeria buergeri is a stream-breeding rhacophorid frog. The sexual dimorphism in body size is significant in this species, which might be advantageous for its movement within the stream in an amplected state. However, the fertilisation rate of egg masses decreases as the body size difference between both sexes in the amplectant pair increases because the distance between the cloacae increases. In this study, we examined the mating pattern of B. buergeri and the relationship between female/male SVL ratio in the amplectant pair and fertilisation rate, and the swimming ability within the stream. As a result, when the female/male SVL ratio was less than 1.45, the fertilisation rate reached a plateau (nearly 100%). However, the fertilisation rate decreased as the female/male SVL ratio increased when this ratio was greater than 1.45. Moreover, a significant positive correlation was observed between the female/male SVL ratio and swimming ability. These results suggest that there was a trade-off between fertilisation rate and swimming ability via the female/male SVL ratio. In the field, we observed a significant positive correlation between male and female SVLs in 16 amplectant pairs, with a mean female/male SVL ratio of 1.44. Our experimental results suggest that when the female/male SVL ratio is 1.44, the fertilisation rate is close to 100%, and the swimming ability can be maintained at an intermediate level. Therefore, B. buergeri adopts a size-assortative mating and maintains the female/male SVL ratio of approximately 1.44 to balance both fertilisation rate and swimming ability, thereby increasing reproductive success.
{"title":"Size-assortative mating of Buergeria buergeri (Anura: Rhacophoridae): breeding strategies for balancing fertilisation rate and swimming ability","authors":"Keigo Takahashi","doi":"10.1163/15685381-bja10159","DOIUrl":"https://doi.org/10.1163/15685381-bja10159","url":null,"abstract":"Buergeria buergeri is a stream-breeding rhacophorid frog. The sexual dimorphism in body size is significant in this species, which might be advantageous for its movement within the stream in an amplected state. However, the fertilisation rate of egg masses decreases as the body size difference between both sexes in the amplectant pair increases because the distance between the cloacae increases. In this study, we examined the mating pattern of B. buergeri and the relationship between female/male SVL ratio in the amplectant pair and fertilisation rate, and the swimming ability within the stream. As a result, when the female/male SVL ratio was less than 1.45, the fertilisation rate reached a plateau (nearly 100%). However, the fertilisation rate decreased as the female/male SVL ratio increased when this ratio was greater than 1.45. Moreover, a significant positive correlation was observed between the female/male SVL ratio and swimming ability. These results suggest that there was a trade-off between fertilisation rate and swimming ability via the female/male SVL ratio. In the field, we observed a significant positive correlation between male and female SVLs in 16 amplectant pairs, with a mean female/male SVL ratio of 1.44. Our experimental results suggest that when the female/male SVL ratio is 1.44, the fertilisation rate is close to 100%, and the swimming ability can be maintained at an intermediate level. Therefore, B. buergeri adopts a size-assortative mating and maintains the female/male SVL ratio of approximately 1.44 to balance both fertilisation rate and swimming ability, thereby increasing reproductive success.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"43 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139277987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-09DOI: 10.1163/15685381-bja10158
Veronica Leah, Pui Yong Min, Indraneil Das
Abstract Lanthanotus borneensis , the Bornean earless monitor, is a monotypic member of the family Lanthanotidae, and restricted to the island of Borneo. Little has been published on its field ecology. This study investigated aspects of its thermal biology through an analysis of surface body temperatures of free ranging individuals against corresponding environmental temperatures, in order to explore aspects of microhabitat utilisation in relation to thermoregulation. A generalised linear mixed model shows significant effect of air and substrate temperatures, but not of water temperature. Further, the fixed effects of substrate temperature (coefficient estimate 0.396; ) versus ambient temperature (0.264; ), is suggestive of thigmothermy as the primary mode of thermoregulation. The species does not appear to utilise specific microhabitat structures to thermoregulate, the results of these observations suggesting that it is a thermoconformer.
{"title":"Thermal biology of Lanthanotus borneensis (Lanthanotidae) in Sarawak, Borneo","authors":"Veronica Leah, Pui Yong Min, Indraneil Das","doi":"10.1163/15685381-bja10158","DOIUrl":"https://doi.org/10.1163/15685381-bja10158","url":null,"abstract":"Abstract Lanthanotus borneensis , the Bornean earless monitor, is a monotypic member of the family Lanthanotidae, and restricted to the island of Borneo. Little has been published on its field ecology. This study investigated aspects of its thermal biology through an analysis of surface body temperatures of free ranging individuals against corresponding environmental temperatures, in order to explore aspects of microhabitat utilisation in relation to thermoregulation. A generalised linear mixed model shows significant effect of air and substrate temperatures, but not of water temperature. Further, the fixed effects of substrate temperature (coefficient estimate 0.396; ) versus ambient temperature (0.264; ), is suggestive of thigmothermy as the primary mode of thermoregulation. The species does not appear to utilise specific microhabitat structures to thermoregulate, the results of these observations suggesting that it is a thermoconformer.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":" 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135192004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-02DOI: 10.1163/15685381-bja10157
Barry P. Stephenson, Jorden Christensen
Abstract Sexually dimorphic body colouration can serve to signal quality in vertebrates, but less is known about its importance in amphibians when compared to some other groups. The green frog ( Lithobates clamitans ) is a common anuran of aquatic habitats in eastern North America. In adults of both sexes, the dorsal abdomen is green or brown, and the ventral abdomen usually white. In contrast, throat colouration is sexually dimorphic; adult male throats are usually bright yellow in colour, whereas females and some males express white throats. We assessed body colouration in males and females from a population in Georgia, USA using spectrophotometry to quantify variation in these features and determine if hidden dimorphism was present. We then asked whether this spectral variation correlated with aspects of phenotype linked to fitness in anurans. Male throats were higher in Green-Yellow Chroma and lower in UV Chroma than those of females, but the sexes did not differ in ventral or dorsal abdominal colour. Male SVL was related to ventral abdominal colouration; larger males tended to have ventral abdomens with longer-wavelength Hue and reduced Green-Yellow Chroma compared to smaller males. However, throat or dorsal abdominal colouration was unrelated to any morphometric trait examined in either sex. Overall, variation in male throat and abdominal colour was only weakly related to indices of male quality; instead, we hypothesize that the persistence of white-throated males in populations throughout the range of green frogs is related to the presence of sex-reversed males and intersex individuals recently described from other populations.
{"title":"The relationship of body colouration to morphological traits in a population of green frogs from Georgia, USA","authors":"Barry P. Stephenson, Jorden Christensen","doi":"10.1163/15685381-bja10157","DOIUrl":"https://doi.org/10.1163/15685381-bja10157","url":null,"abstract":"Abstract Sexually dimorphic body colouration can serve to signal quality in vertebrates, but less is known about its importance in amphibians when compared to some other groups. The green frog ( Lithobates clamitans ) is a common anuran of aquatic habitats in eastern North America. In adults of both sexes, the dorsal abdomen is green or brown, and the ventral abdomen usually white. In contrast, throat colouration is sexually dimorphic; adult male throats are usually bright yellow in colour, whereas females and some males express white throats. We assessed body colouration in males and females from a population in Georgia, USA using spectrophotometry to quantify variation in these features and determine if hidden dimorphism was present. We then asked whether this spectral variation correlated with aspects of phenotype linked to fitness in anurans. Male throats were higher in Green-Yellow Chroma and lower in UV Chroma than those of females, but the sexes did not differ in ventral or dorsal abdominal colour. Male SVL was related to ventral abdominal colouration; larger males tended to have ventral abdomens with longer-wavelength Hue and reduced Green-Yellow Chroma compared to smaller males. However, throat or dorsal abdominal colouration was unrelated to any morphometric trait examined in either sex. Overall, variation in male throat and abdominal colour was only weakly related to indices of male quality; instead, we hypothesize that the persistence of white-throated males in populations throughout the range of green frogs is related to the presence of sex-reversed males and intersex individuals recently described from other populations.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"102 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135975901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.1163/15685381-bja10155
Israel Moreno-Lara, Jorge Luis Becerra-López, Aurelio Ramírez-Bautista
Abstract For species that have a fossorial habit or that spend most of their time under leaf litter, correlative models may not be sufficient to model their potential risk in the face of climate change; this is the case for the species examined here. In the present study, we compared three different models (maximum entropy correlative models, mechanistic models based on species thermal tolerance, and habitat cover) applied to three lizards of the genus Scincella ( S. gemmingeri , S. lateralis and S. silvicola ). Models were proposed for current climate scenario, and for 2050 at three SSPs greenhouse gas concentrations, assessing sites with suitable climate and habitat cover, optimum temperature for species survival, and to selecting the best predictive model. Current and future correlative models indicate areas with little climatic suitability within the thermal range that these lizards can tolerate; however, it was possible to corroborate the presence of populations of S. gemmingeri and S. silvicola in areas that do not have climatic suitability, but do have habitat coverage. These results support the hypothesis that the habitat and microhabitat structures protect these species against possible adverse climatic conditions. It may be that it is also necessary to measure physiological variables (to obtain the thermal range of each species), as well to include both habitat type and habitat structure in spatial analysis.
{"title":"Effect of climate change on fossorial species: a case study comparing species of the genus Scincella","authors":"Israel Moreno-Lara, Jorge Luis Becerra-López, Aurelio Ramírez-Bautista","doi":"10.1163/15685381-bja10155","DOIUrl":"https://doi.org/10.1163/15685381-bja10155","url":null,"abstract":"Abstract For species that have a fossorial habit or that spend most of their time under leaf litter, correlative models may not be sufficient to model their potential risk in the face of climate change; this is the case for the species examined here. In the present study, we compared three different models (maximum entropy correlative models, mechanistic models based on species thermal tolerance, and habitat cover) applied to three lizards of the genus Scincella ( S. gemmingeri , S. lateralis and S. silvicola ). Models were proposed for current climate scenario, and for 2050 at three SSPs greenhouse gas concentrations, assessing sites with suitable climate and habitat cover, optimum temperature for species survival, and to selecting the best predictive model. Current and future correlative models indicate areas with little climatic suitability within the thermal range that these lizards can tolerate; however, it was possible to corroborate the presence of populations of S. gemmingeri and S. silvicola in areas that do not have climatic suitability, but do have habitat coverage. These results support the hypothesis that the habitat and microhabitat structures protect these species against possible adverse climatic conditions. It may be that it is also necessary to measure physiological variables (to obtain the thermal range of each species), as well to include both habitat type and habitat structure in spatial analysis.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135929390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.1163/15685381-bja10156
Christopher L. Cannon, Jon M. Davenport
Abstract Organisms can exhibit plasticity in phenotypic responses to environmental stimuli but the response can vary based on the evolutionary history of a population. Numerous studies have found that prey will express adaptive responses when subjected to various predators in experimental settings. For species with a large distribution, such as Ambystoma maculatum (spotted salamander), it is not surprising that phenotypic variance can be high across their range. This variance has been hypothesized to be because of different predator regimes of populations. While A. maculatum preferentially oviposit eggs in low-risk ponds (temporary fishless) to decrease egg and larval mortality, Missouri populations still use high-risk ponds (permanent with fish) for reproduction. Using a series of experiments, we investigated how A. maculatum population risk influenced adaptive responses to both native and novel predator kairomones. For natural predators, we used larval A. opacum (marbled salamanders) and Lepomis macrochirus (bluegill) and for novel predators we used Siren intermedia (lesser siren). We found that larval salamanders generally responded with no differences in morphological traits to all three predators. However, head width was larger for low-risk populations. One hypothesized benefit of larger heads (increased foraging efficiency) was not fully supported. All larval salamanders also increased refuge use with predators but this decreased over time. Our results suggest that predation risk of a population may influence the degree of phenotypic expression in response to larval predators. Overall, local adaptation may dictate the ability of prey to respond to environmental conditions within a life stage.
{"title":"Local scale population risk determines the adaptive responses of larval salamanders to predator kairomones","authors":"Christopher L. Cannon, Jon M. Davenport","doi":"10.1163/15685381-bja10156","DOIUrl":"https://doi.org/10.1163/15685381-bja10156","url":null,"abstract":"Abstract Organisms can exhibit plasticity in phenotypic responses to environmental stimuli but the response can vary based on the evolutionary history of a population. Numerous studies have found that prey will express adaptive responses when subjected to various predators in experimental settings. For species with a large distribution, such as Ambystoma maculatum (spotted salamander), it is not surprising that phenotypic variance can be high across their range. This variance has been hypothesized to be because of different predator regimes of populations. While A. maculatum preferentially oviposit eggs in low-risk ponds (temporary fishless) to decrease egg and larval mortality, Missouri populations still use high-risk ponds (permanent with fish) for reproduction. Using a series of experiments, we investigated how A. maculatum population risk influenced adaptive responses to both native and novel predator kairomones. For natural predators, we used larval A. opacum (marbled salamanders) and Lepomis macrochirus (bluegill) and for novel predators we used Siren intermedia (lesser siren). We found that larval salamanders generally responded with no differences in morphological traits to all three predators. However, head width was larger for low-risk populations. One hypothesized benefit of larger heads (increased foraging efficiency) was not fully supported. All larval salamanders also increased refuge use with predators but this decreased over time. Our results suggest that predation risk of a population may influence the degree of phenotypic expression in response to larval predators. Overall, local adaptation may dictate the ability of prey to respond to environmental conditions within a life stage.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136312676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1163/15685381-bja10154
Adrián Guerrero-Gómez, Mar Torralva, Francisco José Oliva-Paterna, José Manuel Zamora-Marín
Abstract Comprehensive knowledge on demographic parameters and early life history traits is essential for an effective amphibian management and conservation. Here, we assessed tadpole survival of Alytes dickhilleni in two contrasting small waterbodies (natural pool vs man-made drinking trough). For the first time in the genus Alytes , tadpole survival was quantified at ontogenetic and cohort level. Overall, low survival values were reported for both study sites, being values in the natural pool (0.16) twice than in the man-made drinking trough (0.07). Ontogenetic and cohort variation was congruent between both study sites, with survival rates decreasing in intermediate developmental stages, and highest values being observed in overwintering as compared to summer tadpoles. Owing to the ongoing decline in Alytes populations, these results can be particularly useful for informing future conservation schemes based on tadpole translocation or reintroduction from wild populations.
{"title":"Ontogenetic and cohort estimates of tadpole survival for the threatened Betic midwife toad (Alytes dickhilleni) in two contrasting small waterbodies","authors":"Adrián Guerrero-Gómez, Mar Torralva, Francisco José Oliva-Paterna, José Manuel Zamora-Marín","doi":"10.1163/15685381-bja10154","DOIUrl":"https://doi.org/10.1163/15685381-bja10154","url":null,"abstract":"Abstract Comprehensive knowledge on demographic parameters and early life history traits is essential for an effective amphibian management and conservation. Here, we assessed tadpole survival of Alytes dickhilleni in two contrasting small waterbodies (natural pool vs man-made drinking trough). For the first time in the genus Alytes , tadpole survival was quantified at ontogenetic and cohort level. Overall, low survival values were reported for both study sites, being values in the natural pool (0.16) twice than in the man-made drinking trough (0.07). Ontogenetic and cohort variation was congruent between both study sites, with survival rates decreasing in intermediate developmental stages, and highest values being observed in overwintering as compared to summer tadpoles. Owing to the ongoing decline in Alytes populations, these results can be particularly useful for informing future conservation schemes based on tadpole translocation or reintroduction from wild populations.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135617632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hybrid zones are geographic areas where individuals from distinct taxa meet, mate, and hybridize. These zones may have complex histories, but many of them originated relatively recently, during climatic oscillations in the Quaternary, following range shifts of formerly isolated, well-differentiated lineages. The Bufo bufo species group comprises four species distributed over the Western Palearctic. Whereas the contact zone between Bufo bufo and B. spinosus in western Europe has been well characterized, little is known about other species contacts. Here we focused on the contact between B. verrucosissimus and B. bufo in northeastern Türkiye, using mtDNA and microsatellite markers to describe genetic structure and patterns of admixture in the hybrid zone based on Bayesian clustering and cline analyses. Both species meet in a narrow contact zone at Rize province, with restricted introgression suggesting barriers to hybridization consistent with species status. Spatial population genetic analyses of microsatellite data pinpoint a possible enclave population of B. bufo at the Borçka district in Artvin province, isolated within the B. verrucosissimus range. The centers of the microsatellite and mtDNA-based clines are slightly displaced, with B. verrucosissimus mtDNA introgressing about 33 km W of the nuclear contact. Hybrid zone dynamics seem to be associated with range shifts mediated by Pleistocene glacial cycles and/or sex-biased dispersal.
杂交带是来自不同分类群的个体相遇、交配和杂交的地理区域。这些地区可能有复杂的历史，但它们中的许多都是在第四纪的气候振荡期间相对较近地形成的，随着以前孤立的、分化良好的谱系的范围转移。的以以种群包括四个物种分布在西方古北区的。在西欧，人们对Bufo Bufo与B. spinosus的接触区已经有了很好的描述，但对其他物种的接触却知之甚少。本研究利用mtDNA和微卫星标记，基于贝叶斯聚类分析和梯度分析，对杂交带的遗传结构和杂交模式进行了描述。这两个物种在Rize省的一个狭窄的接触区相遇，有限的渐渗表明杂交障碍与物种状况一致。微卫星数据的空间种群遗传分析确定了在阿尔特文省borka地区可能存在的bufo飞地种群，该种群被隔离在B. verrucosissimus范围内。微卫星和以mtDNA为基础的线的中心有轻微的偏移，疣状芽孢杆菌的mtDNA向核接触处约33 km W的地方渗入。混合带动力学似乎与更新世冰期旋回和/或性别偏倚扩散介导的范围移动有关。
{"title":"Genetic data to describe the hybrid zone between Bufo bufo (Linnaeus, 1758) and Bufo verrucosissimus (Pallas, 1814) in northeastern Türkiye","authors":"Cantekin Dursun, Gregorio Sánchez-Montes, Nurhayat Özdemir, Serkan Gül, Iñigo Martínez-Solano","doi":"10.1163/15685381-bja10152","DOIUrl":"https://doi.org/10.1163/15685381-bja10152","url":null,"abstract":"Hybrid zones are geographic areas where individuals from distinct taxa meet, mate, and hybridize. These zones may have complex histories, but many of them originated relatively recently, during climatic oscillations in the Quaternary, following range shifts of formerly isolated, well-differentiated lineages. The Bufo bufo species group comprises four species distributed over the Western Palearctic. Whereas the contact zone between Bufo bufo and B. spinosus in western Europe has been well characterized, little is known about other species contacts. Here we focused on the contact between B. verrucosissimus and B. bufo in northeastern Türkiye, using mtDNA and microsatellite markers to describe genetic structure and patterns of admixture in the hybrid zone based on Bayesian clustering and cline analyses. Both species meet in a narrow contact zone at Rize province, with restricted introgression suggesting barriers to hybridization consistent with species status. Spatial population genetic analyses of microsatellite data pinpoint a possible enclave population of B. bufo at the Borçka district in Artvin province, isolated within the B. verrucosissimus range. The centers of the microsatellite and mtDNA-based clines are slightly displaced, with B. verrucosissimus mtDNA introgressing about 33 km W of the nuclear contact. Hybrid zone dynamics seem to be associated with range shifts mediated by Pleistocene glacial cycles and/or sex-biased dispersal.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"239 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136015700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-11DOI: 10.1163/15685381-bja10153
Samuel Moura, Jéssica S. Kloh, Cleber C. Figueredo, Paula C. Eterovick
Abstract Eutrophication events resulting from increased primary production are becoming common under changing environmental conditions that include habitat degradation and disturbance of food webs. They cause several detrimental ecological consequences including the intoxication of animals that ingest toxic Cyanobacteria. We tested whether the tadpole of an anthropophilic frog ( Scinax longilineus ) would avoid feeding on a potentially toxic Cyanobacteria using Raphidiopsis raciborskii as a model. We maintained tadpoles in water collected from a natural monospecific growth of R. raciborskii at the original concentration (100%) and concentrations of 0, 25, 50 and 75% of the original sample diluted in rested tap water. We evaluated the amount of R. raciborskii ingested by the tadpoles and conducted behavioral tests by exposing tadpoles to an aversive stimulus and quantifying their escape response. Tadpoles ate the least R. raciborskii the highest the concentration of this Cyanobacteria was in the water. Tadpoles exposed to 50 and 75% of the original concentration of the R. raciborskii sample had a reduction of time spent escaping, what is likely to compromise their ability to escape a real predator attack. Tadpoles at the highest concentration (100%) did not show significant changes in their escape performance, however they practically stopped feeding, what would not be a solution in the long term (i.e., duration of a real bloom). We conclude that tadpoles of S. longilineus can recognize the presence of R. raciborskii and avoid its ingestion, with potential sub-lethal effects represented by a reduced ability to escape predators.
{"title":"An empty stomach is not a good adviser: avoiding toxic Cyanobacteria can compromise tadpole antipredator defenses","authors":"Samuel Moura, Jéssica S. Kloh, Cleber C. Figueredo, Paula C. Eterovick","doi":"10.1163/15685381-bja10153","DOIUrl":"https://doi.org/10.1163/15685381-bja10153","url":null,"abstract":"Abstract Eutrophication events resulting from increased primary production are becoming common under changing environmental conditions that include habitat degradation and disturbance of food webs. They cause several detrimental ecological consequences including the intoxication of animals that ingest toxic Cyanobacteria. We tested whether the tadpole of an anthropophilic frog ( Scinax longilineus ) would avoid feeding on a potentially toxic Cyanobacteria using Raphidiopsis raciborskii as a model. We maintained tadpoles in water collected from a natural monospecific growth of R. raciborskii at the original concentration (100%) and concentrations of 0, 25, 50 and 75% of the original sample diluted in rested tap water. We evaluated the amount of R. raciborskii ingested by the tadpoles and conducted behavioral tests by exposing tadpoles to an aversive stimulus and quantifying their escape response. Tadpoles ate the least R. raciborskii the highest the concentration of this Cyanobacteria was in the water. Tadpoles exposed to 50 and 75% of the original concentration of the R. raciborskii sample had a reduction of time spent escaping, what is likely to compromise their ability to escape a real predator attack. Tadpoles at the highest concentration (100%) did not show significant changes in their escape performance, however they practically stopped feeding, what would not be a solution in the long term (i.e., duration of a real bloom). We conclude that tadpoles of S. longilineus can recognize the presence of R. raciborskii and avoid its ingestion, with potential sub-lethal effects represented by a reduced ability to escape predators.","PeriodicalId":50799,"journal":{"name":"Amphibia-Reptilia","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136253121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-29DOI: 10.1163/15685381-bja10151
Olga Méndez-Méndez, Renato Sánchez-Sánchez, Jazmín Hernández-Luría, Geoffrey R. Smith, Julio A. Lemos-Espinal
Abstract Non-native species have numerous and significant, often negative, effects on amphibians, but that threat may be ameliorated if the native species is able to respond behaviourally to the non-native predators. We experimentally compared the behavioural response of tadpoles of the Ridged Tree Frog, Dryophytes plicatus , to cues from non-native Rainbow Trout, Oncorhynchus mykiss , to those to a native predator, the Short-tail Alpine Garter Snake, Thamnophis scaliger. Dryophytes plicatus tadpoles did not alter activity in response to cues from O. mykiss but increased activity in the presence of cues from T. scaliger , although it is possible this increase is related, at least in part, to the order of the presentation of the cues. The activity of D. plicatus tadpoles was higher in the absence of the vegetation than in its presence when exposed to predator cues, both T. scaliger and O. mykiss , but not in the control. In conclusion, our results show D. plicatus tadpoles alter their overall activity when exposed to cues from a native predator, T. scaliger , but not the non-native O. mykiss . These results may explain, in part, why D. plicatus can co-occur with T. scaliger but not O. mykiss .
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