Papers by Dmitry D Zworykin
Aquatic Conservation: Marine and Freshwater Ecosystems, 2024
1. The Indo-Burma biodiversity hotspot has one of the world's most species-rich inland waters. Ho... more 1. The Indo-Burma biodiversity hotspot has one of the world's most species-rich inland waters. However, its freshwater biodiversity faces habitat loss and species extinction due to large-scale development of water resources, pollution, exploitation of native biota, and introduced non-native species.
2. These threats include the South American suckermouth armoured catfishes, Pterygoplichthys spp., that have invaded parts of this biodiversity hotspot. Pterygoplichthys spp. are among the most impactful introduced fishes globally and pose a ‘very high risk’ of becoming invasive once introduced.
3. This paper aims to compile a distribution database for Pterygoplichthys spp., map their current global distribution, and estimate their potential distribution extent in the Indo-Burma biodiversity hotspot using MaxEnt.
4. In the Indo-Burma region, Pterygoplichthys spp. have already been reported from China, Myanmar, Thailand and Vietnam, with populations also present in neighbouring India, Bangladesh, Malaysia, Singapore and Indonesia. No populations were verified for Cambodia and Laos.
5. A maximum entropy model was developed based on the current global distribution of Pterygoplichthys spp. The species distribution model showed that the entire biodiversity hotspot, except the spine of the Arkan Mountains and the Hengduan Mountains from Three Gorges to the Hong River Valley, is suitable for Pterygoplichthys spp. An effective temperature of 15°C was identified as the lower limit of Pterygoplichthys spp. habitat suitability.
6. Pterygoplichthys spp. were identified as a high-risk taxon for freshwaters of almost the entire Indo-Burma biodiversity hotspot. A coordinated management plan for Pterygoplichthys spp. is required to safeguard the freshwater biota of the Indo-Burma freshwater ecosystems.
Environmental Biology of Fishes, 2024
We examined sexual dimorphism and parental care in the chocolate gourami (Sphaerichthys osphromen... more We examined sexual dimorphism and parental care in the chocolate gourami (Sphaerichthys osphromenoides) by visual observations, video recording of spawning, and histological analysis of the gonads of individuals in which spawning and mouthbrooding was previously observed. S. osphromenoides is considered a rare exception among labyrinth fishes (Osphronemidae family) because of the presumed maternal parental care, which is not found in other species of this family. According to our observations of 32 spawning events, parental care in this species was always performed by the male. Our visual observations were confirmed by video and histological analysis. This suggests that the sex in this species has probably been misidentified so far. We argue that the putative “females” (previously defined by external features) were in fact males, and that there are probably no exceptions to male parental care in osphronemid fishes.
Archives of Natural History, 2023
This paper examines the history of discovery, early research and description of Anabas testudineu... more This paper examines the history of discovery, early research and description of Anabas testudineus (Bloch, 1792) (Anabantidae), an amphibious fish from southern India that was said to climb palm trees and so has been dubbed the “climbing perch”. Amphibious fishes constitute one of the most unusual groups of aquatic creatures since they can spend part of their life in terrestrial habitats. The first reports of such fishes date back to Antiquity, but with the onset of the Age of Discovery, naturalists were able to find actual examples of tropical amphibious fishes and send preserved specimens to Europe. A fish which could move overland and was rumoured to clamber up tree trunks became known to European naturalists through the efforts of a variety of people. Many of them were amateur naturalists whose main activities included politics, commerce and missionary work. The species was described by Marcus Elieser Bloch (1723–1799) in 1792, but this would not have been possible if the Reverend Christoph Samuel John (1747–1813) had not obtained specimens in India and sent them to Berlin. Around the same time, Lieutenant Dagobert Karl Daldorff (fl. 1790–1802) documented the unusual amphibious behaviour of this fish. Thanks to others, Anabas testudineus was illustrated (albeit inaccurately) and the first scientific description published.
Biological Communications, 2023
The invasion risk of non-native suckermouth catfishes Pterygoplichthys spp. in the River Dinh (Vi... more The invasion risk of non-native suckermouth catfishes Pterygoplichthys spp. in the River Dinh (Vietnam) was evaluated using two related decision-support tools, namely the Fish Invasiveness Screening Kit (FISK) and the Aquatic Species Invasiveness Screening Kit (AS-ISK). The results of screenings obtained independently by three assessors using both toolkits were evaluated for consistency, and compared with a screening study previously obtained for Vietnam as a wide risk assessment area. Both FISK and AS-ISK based screenings were shown to provide adequate and potentially important outcomes in terms of risk of invasiveness and were consistent amongst assessors and between toolkits. The invasion risk of Pterygoplichthys in the River Ding was found to be high and the traits of these fishes that influence their success of becoming established were considered. Some aspects in the use of FISK and AS-ISK as decision-support tools as part of the overall risk analysis of species’ invasions for large risk assessment areas are discussed.
Moscow University Biological Sciences Bulletin, 2022
Non-random mating plays a key role in speciation and impacts the individual life history. Body si... more Non-random mating plays a key role in speciation and impacts the individual life history. Body size is known to be one of the most important traits on which the mate choice is based. Various patterns of body size preference are known in fish, but they have been studied in a limited number of species. Although the climbing perch (Anabas testudineus) is widespread and well known, a few reports of its spawning are published. Moreover, its breeding has only been described in captivity and in most cases it has been artificially induced with hormonal agents. This paper describes the main features of natural spawning of the climbing perch in aquarium compared to induced spawning. A positive size-assortative mating has been revealed. The mating system of Anabas has been shown to be flexible, presumably ranging from monogamy to polygamy. The results are discussed in the context of the general issue of the adequacy of fish behaviour research methods.
Ichthyological Exploration of Freshwaters, 2021
The reproductive state of the climbing perch Anabas testudineus was studied for the first time in... more The reproductive state of the climbing perch Anabas testudineus was studied for the first time in situation when its sexual activity is least expected (in the main stem of a large river, during the dry season and in the arid area). Most of examined specimens in riparian zone of the upper Đà Rȃ`ng River (Central Highlands in Vietnam) were spawning capable. All variants of the spawning capable females were found: ready to spawn, partially spent and running ripe, indicating their current spawning. This result contributes to a better understanding of timing and seasonality in the climbing perch reproduction.
Moscow University Biological Sciences Bulletin, 2020
Anabantoid fishes comprise a unique group, most of whose representatives are characterized by div... more Anabantoid fishes comprise a unique group, most of whose representatives are characterized by diverse forms of parental care. Evolutional reconstruction of the reproductive strategies of anabantoids is challenging, partly due to the lack of reliable evidence of parental care in a number of its representatives, the most famous of which is the climbing perch. Moreover, apparent contradictions between literary sources frequently occur on the subject. This brief overview attempts to analyze the situation and identify the possible causes of disagreement. The further development in understanding the phylogeny of life history strategies in the group, as well as the concept of evolutionary transitions among parental care patterns in fishes in general, depend on the clarification of this situation.
Journal of Ichthyology, 2000
This paper reviews a series of studies of fin digging, one of the least studied forms of parental... more This paper reviews a series of studies of fin digging, one of the least studied forms of parental behavior in cichlid fishes (Cichlidae). It was found that the main adaptive function of this behavioral patter is parental brood provisioning. The fin digging intensity increased with the offspring age. The parental satiation state regulates the intensity of this behavior. For the first time we studied the relationships between parental temperament (consistent individual differences in behavior), patterns of their parental care, and assortative mating. In addition, we observed several previously not described patterns of parental efforts division in Archocenterus nigrofasciatum and A. octofasciatum. It was found that these fishes display alternative tactics of parental investment. On the basis of the original and literature data it was hypothesized that the parental brood provisioning evolved as an evolutionary extension and change of function from the adults own foraging activity to parental brood provisioning.
Biology Bulletin Reviews, 2021
The first report on terrestrial movements of amphibious fish was published at the end of the 18th... more The first report on terrestrial movements of amphibious fish was published at the end of the 18th century, but very little is still known about this behavior. Several hypotheses were suggested as to why amphibious fish leave the water, but none has been confirmed to date. Short overland movements of amphibious fish between water bodies occur during the rainy season, when weather conditions make this behavior possible. The spawning peak for these fish is in the same period. Some authors have recently linked these two phenomena, but the role of terrestrial locomotion as spawning migrations has not been really proven. Furthermore, overland movements of amphibious fish have sometimes been referred to as “lateral migration,” which does not correspond to the definition of the term. Obviously, terrestrial movements ensure flexibility of life-history strategies in amphibious fish under habitat fragmentation. At the same time, these locomotions are most likely not migrations and are not always associated with spawning. A metapopulation approach to the study of life histories in amphibious fish appears to be promising. This conceptual framework would clarify both the population structure and dynamics, and the role of different types of movements in providing exchange between subpopulations.
Journal of Ichthyology, 2019
Journal of Ichthyology, 1995
Parental behavior of males and females of the cichlid fish, Cichlasoma octofasciatum, was quantit... more Parental behavior of males and females of the cichlid fish, Cichlasoma octofasciatum, was quantitatively analyzed from the moment of spawning until the dispersal of the family group. Certain aspects of the organization and interrelationships of parental investment of the partners are discussed.
Marine and Freshwater Behaviour and Physiology, 1998
Anabantoid fishes form a unique group, most of which are characterized by diverse forms of parent... more Anabantoid fishes form a unique group, most of which are characterized by diverse forms of parental care. Reconstruction of the reproductive strategies evolution in anabantoids remains a challenge. This is partly due to the lack of reliable evidence of parental care in a number of its representatives, the most famous of which is the climbing perch. Moreover, apparent contradictions between literary sources frequently occur on the subject. This brief overview attempts to analyze the situation and identify the likely causes of disagreement. The further development of understanding of the life strategies phylogeny in the group, as well as concept of evolutionary transitions among parental care modes in fishes in general, depend on clarification of this situation.
Journal of Ichthyology, 2018
International Journal of Comparative Psychology, 1997
Consistency of individual differences in several measures of Skinner box operant and other activi... more Consistency of individual differences in several measures of Skinner box operant and other activity and their intercorrelations in 14 chinchilla bred rabbits were studied. Reliability analysis revealed that both operant and activity measures were highly consistent (Cronbach alpha>0.87) over at least 15 days. Furthermore, locomotor activity, the tendencies to press the lever with high frequency, to make many errors, to check the presence of food in the dispenser as well as rearing were highly inter-correlated, making up a single dimension of activity. However, grooming did not correlate with these behaviors.
Журнал общей биологии, 2020
Первое сообщение о сухопутных перемещениях рыб-ползунов было опубликовано в научной литературе в ... more Первое сообщение о сухопутных перемещениях рыб-ползунов было опубликовано в научной литературе в конце XVIII в., однако до сих пор про это поведение известно крайне мало. Было высказано несколько гипотез о том, зачем амфибийные рыбы покидают воду, но ни одна из них на сегодняшний день не подтверждена. Короткие передвижения ползунов по суше между водоемами происходят в сезон дождей, когда погодные условия делают такое поведение возможным. На тот же период приходится пик нереста этих рыб. В последние десятилетия некоторые авторы стали априорно связывать между собой два этих явления, однако роль сухопутных перемещений в качестве нерестовых миграций не доказана. Кроме того, передвижения ползунов по суше стали называть латеральными миграциями, что не соответствует определению данного понятия. Очевидно, что сухопутные перемещения обеспечивают высокую пластичность жизненных стратегий ползунов, населяющих среду с изменчивой фрагментарностью. В то же время с большой вероятностью данные передвижения не являются миграциями и не всегда связаны с нерестом. Представляется перспективным применить к изучению жизненных циклов ползунов метапопуляционный подход, который позволил бы прояснить как структурную организацию популяций этих рыб, так и роль различных типов перемещений, обеспечивающих связь и обмен между субпопуляциями.
Вестник Московского университета. Серия 16. Биология, 2022
Неслучайный выбор партнера по размножению играет важную роль как в процессах видообразования, так... more Неслучайный выбор партнера по размножению играет важную роль как в процессах видообразования, так и в жизненной стратегии конкретной особи. Один из ключевых критериев выбора – размер тела. У рыб известны различные типы размерной избирательности партнеров, однако исследован этот компонент репродуктивной стратегии только у небольшого числа видов. Несмотря на широкое распространение и известность рыбы-ползуна (Anabas testudineus), опубликовано лишь несколько описаний его нереста, причем только в неволе и в большинстве случаев – искусственно стимулированного с помощью гормональных препаратов. В данной работе описаны основные особенности естественного нереста ползуна в аквариумных условиях в сравнении с индуцированным нерестом. Выявлена положительная размерная ассортативность при первоначальном выборе самкой анабаса партнера по размножению, а также показано, что система спаривания этих рыб характеризуется пластичностью, варьируя от предположительной моногамии до полигамии. Полученные результаты обсуждаются в контексте общей проблемы адекватности методов исследования поведения рыб.
Вопросы ихтиологии, 2016
Представлены результаты исследования ихтиофауны р. Нюкжа (бассейн Лены), её притоков (Джелтула, Н... more Представлены результаты исследования ихтиофауны р. Нюкжа (бассейн Лены), её притоков (Джелтула, Нерунга (Малая Нрунна), Огынгли) и озёр данной системы. Список обнаруженных в данном районе рыб включает 12 видов, относящихся к 7 семействам и 5 отрядам. Обсуждается проблема таксономического статуса ряда видов из исследованного района.
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Papers by Dmitry D Zworykin
2. These threats include the South American suckermouth armoured catfishes, Pterygoplichthys spp., that have invaded parts of this biodiversity hotspot. Pterygoplichthys spp. are among the most impactful introduced fishes globally and pose a ‘very high risk’ of becoming invasive once introduced.
3. This paper aims to compile a distribution database for Pterygoplichthys spp., map their current global distribution, and estimate their potential distribution extent in the Indo-Burma biodiversity hotspot using MaxEnt.
4. In the Indo-Burma region, Pterygoplichthys spp. have already been reported from China, Myanmar, Thailand and Vietnam, with populations also present in neighbouring India, Bangladesh, Malaysia, Singapore and Indonesia. No populations were verified for Cambodia and Laos.
5. A maximum entropy model was developed based on the current global distribution of Pterygoplichthys spp. The species distribution model showed that the entire biodiversity hotspot, except the spine of the Arkan Mountains and the Hengduan Mountains from Three Gorges to the Hong River Valley, is suitable for Pterygoplichthys spp. An effective temperature of 15°C was identified as the lower limit of Pterygoplichthys spp. habitat suitability.
6. Pterygoplichthys spp. were identified as a high-risk taxon for freshwaters of almost the entire Indo-Burma biodiversity hotspot. A coordinated management plan for Pterygoplichthys spp. is required to safeguard the freshwater biota of the Indo-Burma freshwater ecosystems.
2. These threats include the South American suckermouth armoured catfishes, Pterygoplichthys spp., that have invaded parts of this biodiversity hotspot. Pterygoplichthys spp. are among the most impactful introduced fishes globally and pose a ‘very high risk’ of becoming invasive once introduced.
3. This paper aims to compile a distribution database for Pterygoplichthys spp., map their current global distribution, and estimate their potential distribution extent in the Indo-Burma biodiversity hotspot using MaxEnt.
4. In the Indo-Burma region, Pterygoplichthys spp. have already been reported from China, Myanmar, Thailand and Vietnam, with populations also present in neighbouring India, Bangladesh, Malaysia, Singapore and Indonesia. No populations were verified for Cambodia and Laos.
5. A maximum entropy model was developed based on the current global distribution of Pterygoplichthys spp. The species distribution model showed that the entire biodiversity hotspot, except the spine of the Arkan Mountains and the Hengduan Mountains from Three Gorges to the Hong River Valley, is suitable for Pterygoplichthys spp. An effective temperature of 15°C was identified as the lower limit of Pterygoplichthys spp. habitat suitability.
6. Pterygoplichthys spp. were identified as a high-risk taxon for freshwaters of almost the entire Indo-Burma biodiversity hotspot. A coordinated management plan for Pterygoplichthys spp. is required to safeguard the freshwater biota of the Indo-Burma freshwater ecosystems.
Обнаружен ряд неизвестных ранее проявлений принципа разделения родительских обязанностей у цихлид: у самок обеспечение потомства кормом более консервативно, не зависит от свойств темперамента, осуществляется более интенсивно и растет с возрастом потомства быстрее, чем у самцов. Формой координации родительских усилий партнеров является «компенсирующее поведение» самцов восьмиполосой цихлазомы, которое призвано восполнить на предличиночном этапе развития потомства недостаток родительской заботы со стороны самок, наблюдающийся вследствие их «опережающей активности». Выявлен ряд комплексов альтернативных тактик реализации родительских вкладов цихловыми рыбами: 1. Тактики, связанные с альтернативным повышением либо интенсивности обеспечения потомства кормом, либо пищедобывательных навыков молоди; 2. Тактики самцов, различающиеся по степени выраженности «компенсирующего» поведения и по типу охраны территории.
На основании оригинальных и литературных данных сформулирована гипотеза, согласно которой родительское взмучивание субстрата претерпевает эволюционное преобразование, протекающее по типу расширения и смены функции от пищедобывательной активности взрослых рыб к обеспечению потомства кормом.
В монографии приведена общая информация о географии, климате, водных ресурсах Вьетнама, о биогеографии его внутренних вод. Представлены данные по гидрохимии и токсикологии континентальных водоёмов, видовому составу и структуре сообществ водорослей. Обобщены результаты исследований гетеротрофных протистов, планктонных и бентосных беспозвоночных. Отдельный раздел посвящён ихтиофауне внутренних водоёмов Вьетнама: фаунистике, миграциям, поведению, изменчивости и другим особенностям рыб, населяющих пресные и солоноватые воды региона.
Книга предназначена для биологов всех специальностей, изучающих тропические пресноводные водоёмы, а также для всех, интересующихся экологией пресных и солоноватых вод Юго-Восточной Азии.
Main forms and features of this parental behaviour were considered. The adaptive functions of stirring up of the bottom substrate is most probably associated with increasing food availability for the offspring. It is also suggested that, because SUBS is associated with both own feeding of adults and parental food provisioning, the immediate nutritive status of adults and their offspring would correlate and satiation of parents may be the primary mechanism regulating SUBS. A possible scenario of the evolution of SUBS may involve an expansion and/or a shift of adaptive function from adults own foraging to parental brood provisioning.
1. ID 726 – Lower Lancang (Mekong)
2. ID 727 – Khorat Plateau (Mekong)
3. ID 728 – Kratie - Stung Treng (Mekong)
4. ID 729 – Mekong Delta
5. ID 730 – Southern Annam
6. ID 731 – Eastern Gulf of Thailand Drainages
7. ID 760 – Northern Annam
8. ID 761 – Song Hong
9. ID 763 – Xi Yiang