Электронная библиотека. Категория: биология (стр.7)
| Название: | Species and trait-based reconstructions of the hydrological regime in a tropical peatland (Central Sumatra, Indonesia) during the Holocene using Testate Amoebae | 
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| Автор ПГУ: | Малышева Елена Александровна  | |
| Вид ресурса: | электронное немультимедийное издание | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь, Преподаватель | |
| Аннотация: | Paleoecological reconstructions of hydrological regimes in tropical peatlands during the Holocene are important for the estimation of their responses to changing environments. However, the application of some widely used proxies, such as testate amoebae, is hampered by poor knowledge of their morphology and ecological preferences in the region. The aim of this study is to describe the morphospecies composition of sub-fossil testate amoebae in deposits of a tropical peatland in Central Sumatra (Indonesia) during the Holocene and reconstruct the hydrological regime using morphospecies- and functional-trait-based approaches. In total, 48 testate amoeba morphospecies were observed. Based on morphospecies composition, we distinguished three main periods of peatland development (13,400–8000, 8000–2000, 2000 cal yr BP–present). The application of the morphospecies-based transfer function provided a more reliable reconstruction of the water regime in comparison to the functional trait-based one. The weak performance of the latter might be related to the poor preservation of shells and the greater variation in the functional traits in sub-fossil communities as compared to the training set and linear modeling approach. These results call for future studies on the functional and morphospecies composition of testate amoebae in a wider range of tropical peatlands to improve the quality of hydrological reconstructions. | |
| Дата издания: | 2022 | |
| Дата загрузки: | 11.11.2023 | |
| Издательство: | Multidisciplinary Digital Publishing Institute (MDPI) | |
| Название: | Species Diversity and Driving Factors of Benthic and Zooplanktonic Assemblages at Different Stages of Thermokarst Lake Development: A Case Study in the Lena River Delta (Middle Siberia) |
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| Автор ПГУ: | Есаулов Антон Сергеевич | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2023 | |
| Дата загрузки: | 16.11.2023 | |
| Издательство: | MDPI | |
| Название: | Spermophilus major |
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| Автор ПГУ: | Титов Сергей Витальевич | |
| Вид ресурса: | мультимедийный ресурс | |
| Тип ресурса: | Научные материалы | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2024 | |
| Дата загрузки: | 26.11.2024 | |
| Издательство: | The IUCN Red List | |
| Название: | Strigea robusta (Digenea: Strigeidae) infection effects on the gonadal structure and limb malformation in toad early development | 
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| Автор ПГУ: | Антон Олегович Спартак Николаевич Ермаков Олег Александрович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | The anomaly P is a mass morphological anomaly reported in some water frog populations across Europe. It was found that polydactyly is only a mild attenuated form of heavy cases of the anomaly P syndrome, which have strong deformations of the hindlimbs and, partly, forelimbs. It was shown that the anomaly P is caused by the trematode Strigea robusta and this syndrome can be considered as a special case of strigeosis in amphibians. The anomaly P for a long time considered to be specific for water frogs of the genus Pelophylax. Herein, we describe polydactyly and heavy forms of the anomaly P syndrome in toads of the genera Bufo and Bufotes, as a result of exposure to S. robusta cercariae. A total of 150 tadpoles of Bufo bufo, 60 tadpoles of Bufotes viridis, and 60 tadpoles of Bufotes baturae were divided into five experimental and four control groups (30 tadpoles in each group). All anomalies in the toads were similar to those observed in water frogs. The survival of tadpoles in the experimental groups was 76%. The anomaly P was observed in 57.9% of toad tadpoles (51.8% of mild forms and 6.1% of heavy forms). The occurrence of the anomaly P varied among groups from 19% to 78%. Heavy forms of the anomaly P were found in all experimental groups. We described rare asymmetrical cases of the anomaly P. According to severe modification of limb morphology, we supposed changes of gonadal morphology (any modifications of the germ and somatic cells). The gonadal development of infected tadpoles was however the same as in uninfected toad tadpoles, and heterochromatin distribution within gonocytes had no differences as well. It seems like the parasite doesn't have any effect on the gonadal development of the toads. The lack of heavy forms in natural populations of toads, as well as a development of gonads were discussed. | |
| Дата издания: | 2022 | |
| Дата загрузки: | 02.11.2022 | |
| Издательство: | Wiley | |
| Название: | Strigea robusta causes polydactyly and severe forms of Rostand's anomaly P in water frogs | 
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| Автор ПГУ: | Ермаков Олег Александрович Антон Олегович Иванов Александр Юрьевич | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | Cases of polydactyly in natural populations of amphibians have attracted great interest from biologists. At the end of the 1940s, the French biologist Jean Rostand discovered a polymorphic syndrome in some water frog (Anura: Pelophylax) populations that included polydactyly and some severe morphological anomalies (he called it 'anomaly P'). The cause of this anomaly remains unknown for 70 years. In a previous study, we obtained anomaly P in the laboratory in tadpoles of water frogs that developed together with molluscs Planorbarius corneus (Mollusca: Gastropoda) collected in the field. We thus proposed the 'trematode hypothesis', according to which the infectious agent responsible for anomaly P is a trematode species.MethodsMetacercariae from tadpoles with anomaly P were identified using ITS2 gene sequencing as Strigea robusta (Trematoda: Strigeidae). To verify teratogenic features of the species, cercariae of S. robusta were tested for the possibility to cause anomalies. Identification of cercariae species was made using morphological and molecular methods (sequencing of ITS2 and 28S rRNA). The tadpoles were exposed to parasites at four doses of cercariae (control, low, medium and high) and divided into two groups: "early" (at 25-27 Gosner stages) and "late" (at 29-34 Gosner stages) exposure. Results A total of 58 (72.5%) tadpoles survived until metamorphosis under the dose-dependent experiment with the trematode S. robusta. Differences in the survival rates were observed between the exposed and unexposed tadpoles both in the group of "early" tadpoles and "late" tadpoles. The exposure of tadpoles to the cercariae of S. robusta induced anomaly P in 82% of surviving tadpoles. The severe forms developed only in "early" stages under all doses of cercariae exposure. Polydactyly predominantly developed in the "late" stages; under a light exposure dose, polydactyly also developed in "early" tadpoles. Laboratory-hatched tadpoles reared together with infected snails had different rates of survival and complexity of deformations associated with the period of coexistence. ConclusionsThe experiments with direct cercariae exposure provide compelling evidence that S. robusta leads to anomaly P in tadpoles of water frogs. The manifestation of anomaly P turned out to be dependent on the stage of development, cercariae dose, and the location of the cysts. | |
| Дата издания: | 2020 | |
| Дата загрузки: | 23.11.2020 | |
| Издательство: | BioMed Central Ltd. | |
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ИР получен из базы данных "Scopus" автоматически
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| Название: | Structural and species diversity of forest landscape phytocenoses of water-glacial plains (within the Penza oblast) |
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| Автор ПГУ: | Леонова Наталья Алексеевна | |
| Вид ресурса: | электронное немультимедийное издание | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2020 | |
| Дата загрузки: | 23.11.2020 | |
| Издательство: | Изд. ПГУ | |
| Название: | Successional state of forests in the upper plateau of the Volga Upland |
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| Автор ПГУ: | Леонова Наталья Алексеевна | |
| Вид ресурса: | электронное немультимедийное издание | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2021 | |
| Дата загрузки: | 16.11.2021 | |
| Издательство: | Изд. ПГУ | |
| Название: | Surrounded by Kindred: Spermophilus major hybridization with other Spermophilus species in space and time |
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| Автор ПГУ: | Ермаков Олег Александрович Титов Сергей Витальевич | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | The role of hybridization in biological evolution and cases of hybridogenic speciation is one of the most complicated but also interesting and actively studied topics. Russet ground squirrel Spermophilus major is known as a fine biological species according to a number of criteria—morphological, ecological, and behavioral, respectively. Nevertheless, a large body of evidence has accumulated on the hybridization of S. major with four neighboring Spermophilus species. Our goal was to identify their contribution to the nuclear and mitochondrial genome of S. major, and to propose a hypothesis describing the hybridization history in space and time. We found that 36% of S. major individuals had extraneous alleles, and every contacting species contributed to S. major’s genetic variability. Our data suggested at least five independent hybridization events that were associated with shifts in the species ranges due to paleoclimate changes. Two of them were potentially accompanied by mitochondrial captures with replacement of the mitochondrial genome of one of the hybridizing species. We highlight the potential threat to the existence of S. major as a species under the current conditions of population decline along with the simultaneous influx of extraneous genes. It is also particularly important to emphasize the necessity of protecting this inhabitant of unique steppe communities. | |
| Дата издания: | 2023 | |
| Дата загрузки: | 23.10.2023 | |
| Издательство: | Multidisciplinary Digital Publishing Institute (MDPI) | |
| Название: | Testate Amoeba Species- and Trait-Based Transfer Functions for Reconstruction of Hydrological Regime in Tropical Peatland of Central Sumatra, Indonesia |
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| Автор ПГУ: | Цыганов Андрей Николаевич Есаулов Антон Сергеевич | |
| Вид ресурса: | электронное немультимедийное издание | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научно-популярное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2020 | |
| Дата загрузки: | 18.11.2021 | |
| Издательство: | Frontiers media S.A. | |
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ИР получен из базы данных "Scopus" автоматически
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| Название: | Testate amoebae (Amphitremida, Arcellinida, Euglyphida) in Sphagnum bogs: The dataset from Eastern Fennoscandia | 
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| Автор ПГУ: | Малышева Елена Александровна Чернышов Виктор Александрович Комаров Александр Александрович Есаулов Антон Сергеевич | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | The paper describes a dataset, comprising 236 surface moss samples and 143 testate amoeba taxa. The samples were collected in 11 Sphagnum-dominated bogs during frost-free seasons of 2004, 2007, 2009, 2017, and 2022. For the whole dataset, the sampling effort was sufficient in terms of observed species richness (143 species in total), though a regional species pool is deemed to be discovered incompletely (143 species is its lower 95 % confidence limit using Chao’s estimator). The local community composition demonstrated high heterogeneity in a reduced ordination space. It supports the opinion that the high versatility of bog ecosystems should be taken into account during ecological studies. | |
| Дата издания: | 2023 | |
| Дата загрузки: | 02.12.2024 | |
| Издательство: | MDPI | |
| Название: | TESTATE AMOEBAE AS PALEOHYDROLOGICAL INDICATORS IN THE BOREAL AND SUBARCTIC PERMAFROST MIRES IN THE WESTERN PART OF THE CENTRAL SIBERIAN PLATEAU |
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| Автор ПГУ: | Чернышов Виктор Александрович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2025 | |
| Дата загрузки: | 21.11.2025 | |
| Издательство: | Elsevier Science Publishing Company, Inc. | |
| Название: | The Effects of Vegetation and the Environment on Testate Amoeba Assemblages in Sphagnum Peatlands in the Northern Caucasus Mountains |
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| Автор ПГУ: | Есаулов Антон Сергеевич | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2023 | |
| Дата загрузки: | 16.11.2023 | |
| Издательство: | MDPI | |
| Название: | The features of lokomotor reabilitation of children with developmental disabilites |
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| Автор ПГУ: | Петрунина Светлана Валентиновна Соломатина Галина Алексеевна Опарина Ольга Николаевна | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Монография, изданная зарубежными издательствами (наличие ISBN) | |
| Целевое назначение: | Учебное | |
| Целевая аудитория: | Преподаватель | |
| Дата издания: | 2015 | |
| Дата загрузки: | 15.11.2018 | |
| Издательство: | "Наука/Интерпериодика", Москва | |
| Название: | The first detection of a putative hybrid between Miller’s and Eurasian water shrews (Neomys milleri and N. fodiens) |
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| Автор ПГУ: | Ермаков Олег Александрович Луконина Светлана Александровна Быстракова Наталья Викторовна | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | We report the discovery of a water shrew specimen displaying intermediate morphological characteristics between Neomys milleri and N. fodiens, found in the Ulyanovsk region (53.8359° N, 48.4986° E). This locality is considerably distant (360-420 km) from the known range of N. milleri. We describe the capture location and external characteristics of the animal and present an analysis of its mitochondrial cytb gene and three nuclear introns (TRAIP, CSF2 and GDAP1). Although the specimen’s mtDNA was initially identified as N. milleri, analysis of the nuclear introns revealed mixed inheritance: two were specific to N. milleri and one to N. fodiens. This combination of characteristics suggests a hybrid origin resulting from recurrent crossbreeding. | |
| Дата издания: | 2026 | |
| Дата загрузки: | 22.10.2026 | |
| Издательство: | Общество с ограниченной ответственностью Товарищество научных изданий КМК (Москва) | |
| Название: | The first molecular confirmation of the presence of the genus Ladislavella (Gastropoda: Lymnaeidae) in the European part of Russia |
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| Автор ПГУ: | Комарова Екатерина Валентиновна | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Журнал | |
| Целевое назначение: | Научно-популярное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | The article reports the finding of a population of freshwater snails morphologically and genetically identified as Ladislavella cf. terebra (Westerlund, 1885), in a reservoir situated in Penza City. This is the first reliable record of representatives of the genus Ladislavella on the territory of European Russia, at a considerable distance from the previously known boundaries of its range. Molecular data suggest that the examined population belongs to the previously unknown species of Ladislavella. The morphoanatomic and ecological characteristics of the studied population and some information about parasites and commensals of the mollusсs are given. | |
| Дата издания: | 2023 | |
| Дата загрузки: | 08.09.2023 | |
| Издательство: | Институт проблем экологии и эволюции им. А.Н. Северцова РАН | |
| Название: | The first record of natural transfer of mitochondrial dna from pelophylax cf. Bedriagae into p. lessonae (amphibia | 
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| Автор ПГУ: | Ермаков Олег Александрович Иванов Александр Юрьевич Александр Борисович Александр Ильдусович Игорь Вячеславович Александр Александрович Антон Олегович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2019 | |
| Дата загрузки: | 10.11.2019 | |
| Издательство: | Фонд «Медвежья Земля» | |
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ИР получен из базы данных "Scopus" автоматически
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| Название: | THE HOLOCENE HYDROCLIMATIC CHANGES, PALSA PEATLAND DEVELOPMENT AND VEGETATION HISTORY IN THE INNER PART OF THE CENTRAL SIBERIAN PLATEAU (RUSSIA) |
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| Автор ПГУ: | Комаров Александр Александрович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2026 | |
| Дата загрузки: | 15.10.2026 | |
| Издательство: | Elsevier Science Publishing Company, Inc. | |
| Название: | The incidence of the anomaly P syndrome in water frogs (Anura, Ranidae, Pelophylax) from the Middle Volga River (Russia) |
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| Автор ПГУ: | Антон Олегович Спартак Николаевич Ермаков Олег Александрович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | The anomaly P is a widespread morphological anomaly, which occurs in some groups of amphibians, caused by the trematode parasite Strigea robusta (Digenea: Strigeidae). This anomaly has been previously recorded in water frogs of the genus Pelophylax and toads of the genera Bufo and Bufotes. The anomaly P includes symmetrical polydactyly cases as a mild attenuated form of the complex syndrome, which in severe cases includes strong deformations of hindlimbs and forelimbs. Strigea robusta has a complex 3-host life cycle using planorbid mollusks as the first intermediate hosts, amphibian larvae as the second intermediate hosts, and anatid birds as the definitive hosts. Herein, we described new records of the anomaly P syndrome in water frogs of the genus Pelophylax from the northeastern parts of their ranges. Symmetrical polydactyly (as a mild form of the anomaly P syndrome) was found in 30 individuals of three species of water frogs from seven localities: in 25 individuals of P. lessonae from four waterbodies, in four individuals of P. ridibundus from three waterbodies, and one individual of P. esculentus. In Gusevo pond, three individuals of P. lessonae with severe cases of the syndrome were found. This is the first record of the anomaly P in reliably identified hybridogenetic edible frogs (P. esculentus) that have been identified in nature. Additionally, we provided new data about the occurrence of the anomaly P and the prevalence of the trematode S. robusta in mollusks taken from two water bodies where anomalous water frogs were found. | |
| Дата издания: | 2023 | |
| Дата загрузки: | 23.10.2023 | |
| Издательство: | PENSOFT PUBLISHERS | |
| Название: | The mitochondrial phylogeography of the Crimean endemic lizard Darevskia lindholmi (Sauria, Lacertidae): Hidden diversity in an isolated mountain system | 
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| Автор ПГУ: | Ермаков Олег Александрович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Аннотация: | The Lindholm rock lizard, Darevskia lindholmi, is the only member of the genus Darevskia whose range is restricted solely to Europe, representing a local endemism found only in the Crimean Mountains. In our study, we investigated the cytochrome b gene (mtDNA) of 101 D. lindholmi sequences from 65 Crimean localities, representing its entire range. We found that D. lindholmi is highly genetically structured, and its range is divided into populations belonging to three mitochondrial lineages. The Lindholm rock lizard populations inhabiting the middle part of the Crimean Mountains (further referred to as the Central lineage) are sharply differentiated from the other two lineages (the Common and the Southwestern lineages), which are present in most of the species range. The genetic distance between the Central lineage and the other two taken together is 4.6%, according to our results, suggesting that the divergence occurred during the Early Pleistocene. The narrowly distributed Southwestern lineage and the widespread Common lineage, on the other hand, are differentiated by 1%. Field observations on the representatives of the main evolutionary groups show that their ecology is also different: the Central lineage is a mesophilic and cold-resistant form, while the other two closely related lineages are more xerophilic and thermophilic. Results of the potential ranges modeling and ecological niche analysis confirm that the genetic lineages occupy different niches of the Crimea. Furthermore, the area of inhabitation of the Central lineage splits the western and eastern parts of the Common lineage range, while the Southwestern lineage is restricted along the coast of the southwestern coast of the peninsula. The long-term co-existence of deeply divergent sister mitochondrial lineages in a relatively small (circa 7,000 km2) isolated mountain system serves as a mesocosm for understanding the speciation process. Our data suggest that the Central lineage warrants further taxonomic investigation. | |
| Дата издания: | 2021 | |
| Дата загрузки: | 08.11.2021 | |
| Издательство: | Museum of Zoology Dresden | |
| Название: | The role of unequilibrium dynamics of the number and genetic structure of populations in interspecifi c interactions of the russet (Spermophilus major Pall.) and the speckled (Spermophilus suslicus Güld.) ground squirrels in a wide zone of sympatry |
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| Автор ПГУ: | Титов Сергей Витальевич Чернышова Ольга Валерьевна Закс Светлана Сергеевна Картавов Никита Александрович | |
| Вид ресурса: | электронная копия бумажного издания | |
| Тип ресурса: | Статья | |
| Целевое назначение: | Научное | |
| Целевая аудитория: | Исследователь | |
| Дата издания: | 2024 | |
| Дата загрузки: | 22.11.2024 | |
| Издательство: | Известия Саратовского университета | |