Abstract: An invasive alien species American bullfrog (hereafter, ‘bullfrog') is found in freshwater lakes in Onuma Quasi-National Park, Hokkaido, Japan. Bullfrog commonly feeds on red swamp crayfish in many areas. However, red swamp crayfish has not been confirmed in Komuna Lake, Onuma Quasi-National Park. The purpose of this study is to examine the trend of predation on native biomes in areas without crayfish presence. We detected the dietary composition of bullfrogs. The stomach contents of 469 individuals were analyzed and classified. The stomach contents of adult frogs accounted for 67.4% of volume were vertebrates including Actinopterygii and Amphibia such as Japanese crucian carp, topmouth gudgeon, bullfrog juveniles, bullfrog tadpoles and Japanese common toad. Further, aquatic animals were preyed more than terrestrial animals in volume (60.0%) and frequency (90.0%). From these results, bullfrogs in Onuma Quasi-National Park used most conspicuous alien aquatic species such as alien fish and frogs of the same species as food resources and further revealed that these alien aquatic species function as a substitute food for the crayfish. While the majority of bullfrog food resources are alien aquatic species, several rare aquatic animals were also preyed on. In the future, it will be necessary to investigate the predation pressure of bullfrogs on local biodiversity.
{"title":"Diet Composition of the Invasive American Bullfrog (Lithobates catesbeianus) in Onuma Quasi-National Park, Hokkaido, Japan","authors":"M. Sarashina, T. Yoshida","doi":"10.5358/hsj.40.77","DOIUrl":"https://doi.org/10.5358/hsj.40.77","url":null,"abstract":"Abstract: An invasive alien species American bullfrog (hereafter, ‘bullfrog') is found in freshwater lakes in Onuma Quasi-National Park, Hokkaido, Japan. Bullfrog commonly feeds on red swamp crayfish in many areas. However, red swamp crayfish has not been confirmed in Komuna Lake, Onuma Quasi-National Park. The purpose of this study is to examine the trend of predation on native biomes in areas without crayfish presence. We detected the dietary composition of bullfrogs. The stomach contents of 469 individuals were analyzed and classified. The stomach contents of adult frogs accounted for 67.4% of volume were vertebrates including Actinopterygii and Amphibia such as Japanese crucian carp, topmouth gudgeon, bullfrog juveniles, bullfrog tadpoles and Japanese common toad. Further, aquatic animals were preyed more than terrestrial animals in volume (60.0%) and frequency (90.0%). From these results, bullfrogs in Onuma Quasi-National Park used most conspicuous alien aquatic species such as alien fish and frogs of the same species as food resources and further revealed that these alien aquatic species function as a substitute food for the crayfish. While the majority of bullfrog food resources are alien aquatic species, several rare aquatic animals were also preyed on. In the future, it will be necessary to investigate the predation pressure of bullfrogs on local biodiversity.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47343521","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}
Abstract: The genus Nyctibatrachus is endemic to the Western Ghats, India, and includes a number of species that are highly restricted in their distribution. Nyctibatrachus kempholeyensis is an endemic species distributed in the Central Western Ghats. In this paper we describe the development of eight polymorphic microsatellite markers for N. kempholeyensis. These markers were tested for cross-amplification in other Nyctibatrachus species. In addition, we confirmed the cross-amplification of three microsatellite markers from another species, N. major. The 11 microsatellites were screened with 76 individuals of N. kempholeyensis and were found to have 3–8 alleles per locus, with observed heterozygosity ranging from 0.15 to 0.95. These microsatellite markers could be used to study population diversity across fragmented habitats, to quantify genetic structure, and to assess gene flow across the populations in this endemic genus.
{"title":"Development and Characterization of Microsatellite Markers for the Endemic Frog Nyctibatrachus kempholeyensis and Cross Amplification with Other Nyctibatrachus Species from the Western Ghats, India","authors":"R. Srirama, H. Priti, N. A. Aravind, G. Ravikanth","doi":"10.5358/hsj.39.196","DOIUrl":"https://doi.org/10.5358/hsj.39.196","url":null,"abstract":"Abstract: The genus Nyctibatrachus is endemic to the Western Ghats, India, and includes a number of species that are highly restricted in their distribution. Nyctibatrachus kempholeyensis is an endemic species distributed in the Central Western Ghats. In this paper we describe the development of eight polymorphic microsatellite markers for N. kempholeyensis. These markers were tested for cross-amplification in other Nyctibatrachus species. In addition, we confirmed the cross-amplification of three microsatellite markers from another species, N. major. The 11 microsatellites were screened with 76 individuals of N. kempholeyensis and were found to have 3–8 alleles per locus, with observed heterozygosity ranging from 0.15 to 0.95. These microsatellite markers could be used to study population diversity across fragmented habitats, to quantify genetic structure, and to assess gene flow across the populations in this endemic genus.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41994170","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}
Guanghua Zhu, Shijun Yang, A. Savitzky, Liang Zhang, Yuqi Cheng, Jiajun Wang
Abstract: We report the presence of nucho-dorsal glands in Rhabdophis guangdongensis. This recently described species is the 18th member of the genus known to possess integumentary defensive glands. Nine to ten pairs of nuchal glands, separated by a diastema from 116–118 pairs of dorsal glands were observed in two specimens. Because the species was previously known only from the female holotype, we also report data on the size and scalation of five additional specimens and on the morphology of the hemipenis.
{"title":"The Nucho-dorsal Glands of Rhabdophis guangdongensis (Squamata: Colubridae: Natricinae), with Notes on Morphological Variation and Phylogeny Based on Additional Specimens","authors":"Guanghua Zhu, Shijun Yang, A. Savitzky, Liang Zhang, Yuqi Cheng, Jiajun Wang","doi":"10.5358/hsj.39.108","DOIUrl":"https://doi.org/10.5358/hsj.39.108","url":null,"abstract":"Abstract: We report the presence of nucho-dorsal glands in Rhabdophis guangdongensis. This recently described species is the 18th member of the genus known to possess integumentary defensive glands. Nine to ten pairs of nuchal glands, separated by a diastema from 116–118 pairs of dorsal glands were observed in two specimens. Because the species was previously known only from the female holotype, we also report data on the size and scalation of five additional specimens and on the morphology of the hemipenis.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41265491","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}
Abstract: Several reptiles and amphibians frequently occur in environments exposed to artificial lights and appear to effectively hunt prey animals attracted to the light. Therefore, it would be beneficial for them to use such a habitat to survive in urban areas. In this paper, we examined site fidelity of a nocturnal gecko, Gekko japonicus, to a particular artificial light environment in the field. We observed short-term dependence on the same light environment by individual geckos for four to nine consecutive nights and also examined long-term site fidelity once every 10 days from March to November. The same individual frequently came to the particular light for several consecutive nights, but day and time of appearance varied among individuals. Over several months, 20% of marked individuals were repeatedly sighted at the same place although the number of their re-sightings was low (1–5 times). These results suggest that each G. japonicus may settle down in a certain artificially lit environment and use it repeatedly, but the dependence on lights not be so strong.
{"title":"Site Fidelity of Gekko japonicus to Artificially Lit Environments","authors":"Kohei Kobayashi, A. Mori","doi":"10.5358/hsj.39.184","DOIUrl":"https://doi.org/10.5358/hsj.39.184","url":null,"abstract":"Abstract: Several reptiles and amphibians frequently occur in environments exposed to artificial lights and appear to effectively hunt prey animals attracted to the light. Therefore, it would be beneficial for them to use such a habitat to survive in urban areas. In this paper, we examined site fidelity of a nocturnal gecko, Gekko japonicus, to a particular artificial light environment in the field. We observed short-term dependence on the same light environment by individual geckos for four to nine consecutive nights and also examined long-term site fidelity once every 10 days from March to November. The same individual frequently came to the particular light for several consecutive nights, but day and time of appearance varied among individuals. Over several months, 20% of marked individuals were repeatedly sighted at the same place although the number of their re-sightings was low (1–5 times). These results suggest that each G. japonicus may settle down in a certain artificially lit environment and use it repeatedly, but the dependence on lights not be so strong.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46510851","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}
Abstract: The normal development of the brown frog Rana sakuraii is observed from oocyte to completion of metamorphosis in the laboratory at 15±2°C. Tadpoles of this species can develop completely without any food. Their development is divided into 40 stages and this paper provides descriptions and illustrations of the external features at each stage. After hatching, some developmental events occur simultaneously and elongation of hindlimb buds and toe formation are relatively rapid. On the average, the tadpoles reach the stage 36 with their maximum total length 22.8 mm after 43.9 days. They complete metamorphosis after 56.5 days, reaching the final stage 40 with 8.0 mm in snout to vent length. The labial teeth development of this non-feeding tadpole is generally weak and the formula at a given stage is greatly variable among individuals.
{"title":"Complete Embryonic and Larval Stages of Rana sakuraii (Ranidae), a Species that Metamorphoses without Feeding","authors":"Kei Kishimoto, F. Hayashi","doi":"10.5358/hsj.39.173","DOIUrl":"https://doi.org/10.5358/hsj.39.173","url":null,"abstract":"Abstract: The normal development of the brown frog Rana sakuraii is observed from oocyte to completion of metamorphosis in the laboratory at 15±2°C. Tadpoles of this species can develop completely without any food. Their development is divided into 40 stages and this paper provides descriptions and illustrations of the external features at each stage. After hatching, some developmental events occur simultaneously and elongation of hindlimb buds and toe formation are relatively rapid. On the average, the tadpoles reach the stage 36 with their maximum total length 22.8 mm after 43.9 days. They complete metamorphosis after 56.5 days, reaching the final stage 40 with 8.0 mm in snout to vent length. The labial teeth development of this non-feeding tadpole is generally weak and the formula at a given stage is greatly variable among individuals.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42629770","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}
Abstract: Understanding growth of the Japanese pond turtle Mauremys japonica in relation to their habitats is crucial in the strategic planning of conservation measures for the species. However, the pertinent baseline data are inadequate. Hence, I sought to investigate geographic variation in the growth rates of M. japonica in the flatland and foothill regions of Chiba Prefecture, Japan. Turtles were captured and recaptured in both regions from 2014 to 2018, and their growth patterns were analyzed using the von Bertalanffy growth curve. The results show that female turtles in the flatlands grew more rapidly than did those in the foothill site. Male turtles showed the same results, but the overall body size of those in the flatlands was larger than those in the mountains. These findings indicate that the flatland region is an essential habitat for the turtles, and that this study may contribute to the conservation of the species, which is already at risk of local extirpation due to multiple anthropogenic threats in the area.
{"title":"Geographic Variation in the Growth of Japanese Pond Turtles, Mauremys japonica, in the Flatland and Mountain Regions of Chiba Prefecture, Japan","authors":"Shawichi Kagayama","doi":"10.5358/hsj.39.87","DOIUrl":"https://doi.org/10.5358/hsj.39.87","url":null,"abstract":"Abstract: Understanding growth of the Japanese pond turtle Mauremys japonica in relation to their habitats is crucial in the strategic planning of conservation measures for the species. However, the pertinent baseline data are inadequate. Hence, I sought to investigate geographic variation in the growth rates of M. japonica in the flatland and foothill regions of Chiba Prefecture, Japan. Turtles were captured and recaptured in both regions from 2014 to 2018, and their growth patterns were analyzed using the von Bertalanffy growth curve. The results show that female turtles in the flatlands grew more rapidly than did those in the foothill site. Male turtles showed the same results, but the overall body size of those in the flatlands was larger than those in the mountains. These findings indicate that the flatland region is an essential habitat for the turtles, and that this study may contribute to the conservation of the species, which is already at risk of local extirpation due to multiple anthropogenic threats in the area.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46969367","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}
Abstract: Buergeria japonica, long thought to be a single species widely occurring on the Ryukyu Archipelago and Taiwan, proved to include three genetically differentiated clades, (1) the Northern and Central Ryukyu, (2) the Southern Ryukyu and Northern Taiwan, and (3) the Southern Taiwan clades. The Southern Taiwan clade has already been split from the others as a distinct species. A distinct heterospecific relationship of the Southern Ryukyu and Northern Taiwan clade from the Northern and Central Ryukyu clade was also clear from genetic evidence. Morphological comparison between specimens from the Yaeyama (the Southern Ryukyu and Northern Taiwan clade) and Amamioshima, the type locality of B. japonica (the Northern and Central Ryukyu clade), confirmed genetic differences and corroborate their independent species status. Thus, we describe the Northern Taiwan and Southern Ryukyu clade as B. choui sp. nov.
{"title":"A New Species of Buergeria From the Southern Ryukyus and Northwestern Taiwan (Amphibia: Rhacophoridae)","authors":"M. Matsui, A. Tominaga","doi":"10.5358/hsj.39.160","DOIUrl":"https://doi.org/10.5358/hsj.39.160","url":null,"abstract":"Abstract: Buergeria japonica, long thought to be a single species widely occurring on the Ryukyu Archipelago and Taiwan, proved to include three genetically differentiated clades, (1) the Northern and Central Ryukyu, (2) the Southern Ryukyu and Northern Taiwan, and (3) the Southern Taiwan clades. The Southern Taiwan clade has already been split from the others as a distinct species. A distinct heterospecific relationship of the Southern Ryukyu and Northern Taiwan clade from the Northern and Central Ryukyu clade was also clear from genetic evidence. Morphological comparison between specimens from the Yaeyama (the Southern Ryukyu and Northern Taiwan clade) and Amamioshima, the type locality of B. japonica (the Northern and Central Ryukyu clade), confirmed genetic differences and corroborate their independent species status. Thus, we describe the Northern Taiwan and Southern Ryukyu clade as B. choui sp. nov.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70621819","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}
Abstract: The omnivorous, red-eared slider (RES) turtle, Trachemys scripta elegans (Emydidae), is an alien species introduced to Japan from North America. Young RES mainly eat animal matter, but shift to a diet that includes plants as they grow. In recent years, feeding damage by RES to crops, other cultivated plants and endangered plants has been reported in Japan. Few case studies, however, have focused on the feeding damage by this species to Japanese wild plants. Our study therefore aimed to quantify the feeding damage to Japanese wild plants by RES by comparing data on plants available in their habitat to the stomach contents of the turtles. From April to December, 2018, and April to November, 2019, we captured RES at three ponds in Okayama Prefecture, Japan, during two days each month. A total of 39 individual turtles (14 males and 25 females) were captured using basket traps in the ponds. A total of 35 families, 60 genera and 74 species of vascular plants and algae were found in the ponds. The stomach contents of adult RES from the three ponds contained more plant matter, including algae (71%), than animal matter (29%), confirming previous reports. The stomach contents also included Japanese native plants (Tamasu pond: 63%, Narazu pond: 40%, Sayama pond: 57%, with the total contents of all three ponds being 56%). The findings indicate that Japanese native plant species are included in the diet of the RES.
摘要/ Abstract摘要:赤耳滑龟(Trachemys scripta elegans, Emydidae)是由北美引进到日本的杂食性外来物种。年轻的RES主要吃动物食物，但随着他们的成长，他们的饮食会转向包括植物在内的食物。近年来，日本报道了RES对农作物、其他栽培植物和濒危植物的取食损害。然而，很少有案例研究关注该物种对日本野生植物的取食损害。因此，我们的研究旨在通过比较日本野生植物栖息地中可用植物的数据与海龟胃内容物的数据，通过RES量化日本野生植物的取食损害。2018年4月至12月和2019年4月至11月，我们每月两天在日本冈山县的三个池塘捕获RES。在池塘内使用篮式捕集器共捕获39只海龟(雄性14只，雌性25只)。池中共发现维管植物和藻类35科60属74种。来自三个池塘的成年RES胃内容物含有更多的植物物质，包括藻类(71%)，而动物物质(29%)，证实了先前的报道。胃内容物中还包括日本本土植物(Tamasu池占63%，Narazu池占40%，Sayama池占57%，三个池的总含量为56%)。研究结果表明，日本本土植物物种包括在RES的饮食中。
{"title":"Feeding Damage to Native Plants by Red-eared Slider Turtles, Trachemys scripta elegans (Emydidae), in Okayama Prefecture, Western Japan","authors":"Yuna Yamaji, O. Yano","doi":"10.5358/hsj.39.98","DOIUrl":"https://doi.org/10.5358/hsj.39.98","url":null,"abstract":"Abstract: The omnivorous, red-eared slider (RES) turtle, Trachemys scripta elegans (Emydidae), is an alien species introduced to Japan from North America. Young RES mainly eat animal matter, but shift to a diet that includes plants as they grow. In recent years, feeding damage by RES to crops, other cultivated plants and endangered plants has been reported in Japan. Few case studies, however, have focused on the feeding damage by this species to Japanese wild plants. Our study therefore aimed to quantify the feeding damage to Japanese wild plants by RES by comparing data on plants available in their habitat to the stomach contents of the turtles. From April to December, 2018, and April to November, 2019, we captured RES at three ponds in Okayama Prefecture, Japan, during two days each month. A total of 39 individual turtles (14 males and 25 females) were captured using basket traps in the ponds. A total of 35 families, 60 genera and 74 species of vascular plants and algae were found in the ponds. The stomach contents of adult RES from the three ponds contained more plant matter, including algae (71%), than animal matter (29%), confirming previous reports. The stomach contents also included Japanese native plants (Tamasu pond: 63%, Narazu pond: 40%, Sayama pond: 57%, with the total contents of all three ponds being 56%). The findings indicate that Japanese native plant species are included in the diet of the RES.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44176530","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}
Abstract: A Japanese microhylid, Microhyla okinavensis, originally described from Okinawajima Island, middle Ryukyus, was long synonymized with M. ornata from India. However, molecular phylogenetic studies revealed its distinct species status from M. ornata, and more recent phylogenetic study revealed the population from the Yaeyama Group of the southern Ryukyus to be a sister taxon to Chinese M. mixtura and not to populations from the remaining group of the Ryukyus, that are sister to another Chinese species, M. beilunensis. The Yaeyama and the remaining Ryukyu populations greatly differ phylogenetically, although less clearly morphologically. From these data, we consider the Yaeyama population as a species distinct from M. okinavensis from the middle Ryukyus.
{"title":"Distinct Species Status of a Microhyla from the Yaeyama Group of the Southern Ryukyus, Japan (Amphibia, Anura, Microhylidae)","authors":"M. Matsui, A. Tominaga","doi":"10.5358/hsj.39.120","DOIUrl":"https://doi.org/10.5358/hsj.39.120","url":null,"abstract":"Abstract: A Japanese microhylid, Microhyla okinavensis, originally described from Okinawajima Island, middle Ryukyus, was long synonymized with M. ornata from India. However, molecular phylogenetic studies revealed its distinct species status from M. ornata, and more recent phylogenetic study revealed the population from the Yaeyama Group of the southern Ryukyus to be a sister taxon to Chinese M. mixtura and not to populations from the remaining group of the Ryukyus, that are sister to another Chinese species, M. beilunensis. The Yaeyama and the remaining Ryukyu populations greatly differ phylogenetically, although less clearly morphologically. From these data, we consider the Yaeyama population as a species distinct from M. okinavensis from the middle Ryukyus.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47317091","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}
Shawichi Kagayama, Daiichi Ogano, Mari Taniguchi, Kanako Mine, Shintaro Ueno, Hiroo Takahashi, N. Kamezaki, M. Hasegawa
Abstract: The endemic Japanese freshwater turtle Mauremys japonica is the most common turtle in foothill areas, whereas it is usually absent or scarce in lowland environments in Japan. In contrast, another turtle, Reeves' pond turtle (M. reevesii), usually inhabits lowland areas. Explanation of this pattern based on habitat segregation between M. japonica and M. reevesii remains controversial because several studies have emphasized that M. reevesii is not indigenous but rather introduced from mainland China and the Korean Peninsula. The newly proposed hypothesis is that M. reevesii and the recently introduced red-eared slider (Trachemys scripta elegans) have excluded M. japonica from certain suitable habitats in lowland areas. In this study, to test whether M. japonica originally had a broad distribution range covering the habitats currently occupied exclusively by M. reevesii and T. s. elegans, we applied species distribution modeling using MaxEnt and ENMTools to estimate the suitable habitats and ecological niches of M. japonica, M. reevesii, and T. s. elegans, respectively, and examined these similarities. The models showed that M. japonica had the largest suitable habitat range, from flatlands to foothill areas, compared to that of alien species; however, almost the entire habitat area of the native turtle and that of the aliens overlapped. Moreover, these turtles possessed significantly high niche similarity. These results are consistent with the hypothesis that recent species interactions have shaped the distribution of indigenous and alien turtles, although the precise ecological and evolutionary processes have not yet been determined.
摘要/ Abstract摘要:日本特有淡水龟是日本山麓地区最常见的龟类，而在日本低地环境中却很少见到或稀少。相反，另一种龟，里夫斯塘龟(M. reevesii)，通常生活在低地地区。对这一模式的解释仍然存在争议，因为一些研究强调，这一模式不是本土的，而是从中国大陆和朝鲜半岛引进的。新提出的假设是，M. reevesii和最近引进的红耳滑虫(Trachemys scripta elegans)将M. japonica排除在低地地区的某些适宜栖息地之外。为了验证日本稻原是否具有广泛的分布范围，覆盖了目前稻原和秀丽隐杆线虫所特有的生境，我们利用MaxEnt和ENMTools建立物种分布模型，分别估算了日本稻原、稻原和秀丽隐杆线虫的适宜生境和生态位，并对这些相似性进行了检验。模型结果表明，与外来种相比，粳稻的适宜生境范围最大，从平原到山麓;然而，几乎整个本土龟和外来龟的栖息地都是重叠的。此外，这些龟具有显著的高生态位相似性。尽管精确的生态和进化过程尚未确定，但这些结果与最近物种相互作用塑造了本土和外来海龟分布的假设是一致的。
{"title":"Species Distribution Modeling Provides New Insights into Different Spatial Distribution Patterns among Native and Alien Freshwater Turtles in Japan","authors":"Shawichi Kagayama, Daiichi Ogano, Mari Taniguchi, Kanako Mine, Shintaro Ueno, Hiroo Takahashi, N. Kamezaki, M. Hasegawa","doi":"10.5358/hsj.39.147","DOIUrl":"https://doi.org/10.5358/hsj.39.147","url":null,"abstract":"Abstract: The endemic Japanese freshwater turtle Mauremys japonica is the most common turtle in foothill areas, whereas it is usually absent or scarce in lowland environments in Japan. In contrast, another turtle, Reeves' pond turtle (M. reevesii), usually inhabits lowland areas. Explanation of this pattern based on habitat segregation between M. japonica and M. reevesii remains controversial because several studies have emphasized that M. reevesii is not indigenous but rather introduced from mainland China and the Korean Peninsula. The newly proposed hypothesis is that M. reevesii and the recently introduced red-eared slider (Trachemys scripta elegans) have excluded M. japonica from certain suitable habitats in lowland areas. In this study, to test whether M. japonica originally had a broad distribution range covering the habitats currently occupied exclusively by M. reevesii and T. s. elegans, we applied species distribution modeling using MaxEnt and ENMTools to estimate the suitable habitats and ecological niches of M. japonica, M. reevesii, and T. s. elegans, respectively, and examined these similarities. The models showed that M. japonica had the largest suitable habitat range, from flatlands to foothill areas, compared to that of alien species; however, almost the entire habitat area of the native turtle and that of the aliens overlapped. Moreover, these turtles possessed significantly high niche similarity. These results are consistent with the hypothesis that recent species interactions have shaped the distribution of indigenous and alien turtles, although the precise ecological and evolutionary processes have not yet been determined.","PeriodicalId":56053,"journal":{"name":"Current Herpetology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46636904","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}
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