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N. M. Korovchinsky - One of the best experts on this subject based on the ideXlab platform.
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Cladocera (Crustacea, Branchiopoda) of Central Yakutia: 1. Some Representatives of the Families Sididae, Daphniidae, and Ophryoxidae
Biology Bulletin, 2017Co-Authors: A. I. Klimovsky, N. M. Korovchinsky, E. I. Bekker, A. A. KotovAbstract:This series of communications is aimed to report on a study of the water fleas (Crustacea, Cladocera) of Central Yakutia. This first communication provides brief descriptions of the representatives of the families Sididae, Daphniidae, and Ophryoxidae, namely Sida crystallina (O.F. Müller 1776), Diaphanosoma orghidani orghidani Negrea 1982, Diaphanosoma amurensis Korovchinsky et Sheveleva 2009, Diaphanosoma brachyurum (Liévin 1848), Scapholeberis mucronata (O.F. Müller 1776), Scapholeberis rammneri Dumont et Pensaert 1983, Megafenestra cf. nasuta (Birge 1879), Simocephalus cf. serrulatus (Koch 1841), and Ophryoxus kolymensis Smirnov 1992. Remarks are given on the occurrence of these taxa in Northern Eurasia.
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A New Species of the Genus Diaphanosoma Fischer (Crustacea: Cladocera: Sididae) from Claypans in Western Australia
2011Co-Authors: N. M. Korovchinsky, B.v. TimmsAbstract:Diaphanosoma hamatum sp. nov. is described from material from claypans of a restricted area near Onslow in the north-west of Western Australia. It is characterized by some peculiar features, such as presence of well developed rostrum, small reduced eye, and large hooked spine on the apical end of upper twosegmented antennal branch, which distinguish it from other known species of the genus. The new species is probably closely related to the Australian D. unguiculatum and may be considered as the additional member of the Australian endemic fauna. The ecological signifi cance of morphological features of the species is discussed.
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Redescription ofDiaphanosoma volzi Stingelin, 1905 (Crustacea: Daphniiformes: Sididae) with remarks on comparative morphology, biology and geographical distribution
Hydrobiologia, 1995Co-Authors: N. M. KorovchinskyAbstract:The rare Diaphanosoma volzi Stingelin, long confused with D. sarsi Richard and D. celebensis Stingelin, is redescribed, based on extensive material of parthenogenetic and gamogenetic females and males from Thailand. Indonesia, Malaysia, Philippines, India, Australia and Sudan, and a study of intra- and interpopulation morphological variability. Compared with other Diaphanosoma species, it shows the greatest degree of oligomerization and specialization. It is widely distributed in the tropics and subtropics of the Eastern hemisphere, and mostly occurs in shallow, vegetated habitats.
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Description of the male, analysis of morphological variability and geographical distribution of Diaphanosoma senegal Gauthier, 1951
Hydrobiologia, 1993Co-Authors: N. M. KorovchinskyAbstract:Males, gamogenetic females, intra- and interpopulation morphological variability, size range, and sex structure of Diaphanosoma senegal Gauthier are described, based on material from India and Bangladesh. The species range is much enlarged to the East. The possible occurrence of D. senegal in the extensive territory between India and West Africa is discussed.
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new records of Diaphanosoma celebensis stingelin 1900 crustacea daphniiformes sididae in tropical asia with remarks on the morphological variability and biology of the species
Revue d'hydrobiologie tropicale, 1993Co-Authors: N. M. KorovchinskyAbstract:Variabilite morphologique, structure de la population et repartition geographique de l'espece rare Diaphanosoma celebensis Stingelin, 1900 sont etudiees a partir de materiel provenant du sud de l'Inde, de Sri Lanka, de Singapour et de la Malaisie. Cette espece est repandue en Asie tropicale et s'etend jusqu'a la zone subtropicale au nord (Bangladesh); elle se rencontre en eau douce (etangs) aussi bien que dans des eaux de salinite elevee, ce qui etait inconnu chez les Sididae
C. H. Fernando - One of the best experts on this subject based on the ideXlab platform.
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Seasonality and abundance of some dominant crustacean zooplankton in Lake Awasa, a tropical rift valley lake in Ethiopia
Hydrobiologia, 1991Co-Authors: Seyoum Mengestou, C. H. FernandoAbstract:The zooplankton of a Rift Valley lake in Ethiopia, Awasa, was sampled at 3 stations for 2 years (1986 and 1987) concurrently with various meteorological and limnological measurements. The spatial and temporal variation in abundance of some numerically dominant crustaceans, Mesocyclops aequatorialis similis (Copepoda), Thermocyclops consimilis (Copepoda) and Diaphanosoma excisum (Cladocera) is discussed. Temporal (months, sampling dates) rather than spatial (station) variability accounts for more than 50% of the total variance in zooplankton abundance but horizontal patchiness exists during periods of high zooplankton density. Sampling errors were generally low, except for counts of cyclopoid nauplii (subsampling) and Diaphanosoma (inter-replicate variance). Zooplankton showed distinct seasonality associated with the mixing cycle of the lake. Total numbers increased to more than 200 000 m^−3 during the unstratified period (July to September). Low numbers were evident during stratification (February to May) when zooplankton numbers did not exceed 15 000 m^−3. Individual zooplankton species and age classes showed variable seasonal amplitudes, ranging from 6.4 (nauplius 3) to 44.8 (copepodite 3 of Mesocyclops ). We discuss some possible causes for zooplankton seasonality in Lake Awasa, and also review zooplankton seasonal cycles in other tropical lakes, especially African ones.
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Seasonality and abundance of some dominant crustacean zooplankton in Lake Awasa, a tropical rift valley lake in Ethiopia
Hydrobiologia, 1991Co-Authors: Seyoum Mengestou, C. H. FernandoAbstract:The zooplankton of a Rift Valley lake in Ethiopia, Awasa, was sampled at 3 stations for 2 years (1986 and 1987) concurrently with various meteorological and limnological measurements. The spatial and temporal variation in abundance of some numerically dominant crustaceans, Mesocyclops aequatorialis similis (Copepoda), Thermocyclops consimilis (Copepoda) and Diaphanosoma excisum (Cladocera) is discussed. Temporal (months, sampling dates) rather than spatial (station) variability accounts for more than 50% of the total variance in zooplankton abundance but horizontal patchiness exists during periods of high zooplankton density. Sampling errors were generally low, except for counts of cyclopoid nauplii (subsampling) and Diaphanosoma (inter-replicate variance).
Seyoum Mengestou - One of the best experts on this subject based on the ideXlab platform.
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Seasonality and abundance of some dominant crustacean zooplankton in Lake Awasa, a tropical rift valley lake in Ethiopia
Hydrobiologia, 1991Co-Authors: Seyoum Mengestou, C. H. FernandoAbstract:The zooplankton of a Rift Valley lake in Ethiopia, Awasa, was sampled at 3 stations for 2 years (1986 and 1987) concurrently with various meteorological and limnological measurements. The spatial and temporal variation in abundance of some numerically dominant crustaceans, Mesocyclops aequatorialis similis (Copepoda), Thermocyclops consimilis (Copepoda) and Diaphanosoma excisum (Cladocera) is discussed. Temporal (months, sampling dates) rather than spatial (station) variability accounts for more than 50% of the total variance in zooplankton abundance but horizontal patchiness exists during periods of high zooplankton density. Sampling errors were generally low, except for counts of cyclopoid nauplii (subsampling) and Diaphanosoma (inter-replicate variance). Zooplankton showed distinct seasonality associated with the mixing cycle of the lake. Total numbers increased to more than 200 000 m^−3 during the unstratified period (July to September). Low numbers were evident during stratification (February to May) when zooplankton numbers did not exceed 15 000 m^−3. Individual zooplankton species and age classes showed variable seasonal amplitudes, ranging from 6.4 (nauplius 3) to 44.8 (copepodite 3 of Mesocyclops ). We discuss some possible causes for zooplankton seasonality in Lake Awasa, and also review zooplankton seasonal cycles in other tropical lakes, especially African ones.
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Seasonality and abundance of some dominant crustacean zooplankton in Lake Awasa, a tropical rift valley lake in Ethiopia
Hydrobiologia, 1991Co-Authors: Seyoum Mengestou, C. H. FernandoAbstract:The zooplankton of a Rift Valley lake in Ethiopia, Awasa, was sampled at 3 stations for 2 years (1986 and 1987) concurrently with various meteorological and limnological measurements. The spatial and temporal variation in abundance of some numerically dominant crustaceans, Mesocyclops aequatorialis similis (Copepoda), Thermocyclops consimilis (Copepoda) and Diaphanosoma excisum (Cladocera) is discussed. Temporal (months, sampling dates) rather than spatial (station) variability accounts for more than 50% of the total variance in zooplankton abundance but horizontal patchiness exists during periods of high zooplankton density. Sampling errors were generally low, except for counts of cyclopoid nauplii (subsampling) and Diaphanosoma (inter-replicate variance).
Carlos Eduardo Falavigna Da Rocha - One of the best experts on this subject based on the ideXlab platform.
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NeoDiaphanosoma a new genus of Sididae (Branchiopoda, Ctenopoda); with description of N. bergamini sp. n. and comments on N. volzi (Stingelin 1905)
Hydrobiologia, 1999Co-Authors: Juan César Paggi, Carlos Eduardo Falavigna Da RochaAbstract:This paper describes a previously unknown ctenopod crustacean of the family Sididae, collected in Brazil and Venezuela which, along with the forms known as Diaphanosoma volzi, displays distinctive characteristics that are here recognised as being of generic magnitude. Phenetic analysis of the species within the family Sididae, supports the hypothesis that NeoDiaphanosoma constitutes a well defined group, differentiated enough from Diaphanosoma to be accepted as a different genus. The new genus seems to be a group of specialised species, close to Diaphanosoma with advanced features. Some features shared with Sarsilatona, Latonopsis and Pseudosida probably reflect convergence related to littoral habitat more than ancestry.
Nikolai M. Korovchinsky - One of the best experts on this subject based on the ideXlab platform.
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Diaphanosoma Fischer, 1850 (Crustacea: Cladocera: Sididae) of Lake Turkana (East Africa), with the description of a new species of the genus.
Zootaxa, 2017Co-Authors: Nikolai M. Korovchinsky, Elizabeth J. Walsh, Radoslav SmolakAbstract:Diaphanosoma turkanae sp. nov. is described from Lake Turkana (Kenya, East Africa). This species is the second Afrotropical endemic in the order Ctenopoda. It is characterized by a distinctive feature, the presence of an unusually small number of setae on the upper two-segmented antennal branch (exopodite); the proximal segment of the branch always bears three setae while the distal segment bears either six or seven setae. Morphologically the new species is most similar to D. orghidani Negrea , also occurring in Africa and presumably sharing an evolutionary affinity. D. turkanae sp. nov. co-occurs with two other species of the genus, D. lacustris Kořinek and D. excisum Sars, which are briefly described here. Temperate-subtropical species of the genus Diaphanosoma penetrate far south along the Nile River system up to the equatorial and Ethiopian lakes and further southwards, often forming multi-species assemblages.
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Cladocera (Crustacea, Branchiopoda) of Central Yakutia: 1. Some Representatives of the Families Sididae, Daphniidae, and Ophryoxidae
Biology Bulletin, 2017Co-Authors: A. I. Klimovsky, E. I. Bekker, Nikolai M. Korovchinsky, A. A. KotovAbstract:This series of communications is aimed to report on a study of the water fleas (Crustacea, Cladocera) of Central Yakutia. This first communication provides brief descriptions of the representatives of the families Sididae, Daphniidae, and Ophryoxidae, namely Sida crystallina (O.F. Muller 1776), Diaphanosoma orghidani orghidani Negrea 1982, Diaphanosoma amurensis Korovchinsky et Sheveleva 2009, Diaphanosoma brachyurum (Lievin 1848), Scapholeberis mucronata (O.F. Muller 1776), Scapholeberis rammneri Dumont et Pensaert 1983, Megafenestra cf. nasuta (Birge 1879), Simocephalus cf. serrulatus (Koch 1841), and Ophryoxus kolymensis Smirnov 1992. Remarks are given on the occurrence of these taxa in Northern Eurasia.
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The ancient Balkan lakes harbor a new endemic species of Diaphanosoma Fischer, 1850 (Crustacea: Branchiopoda: Cladocera).
Zootaxa, 2014Co-Authors: Nikolai M. Korovchinsky, Trajan K. PetkovskiAbstract:Diaphanosoma macedonicum sp. nov. is described from material collected from the ancient Lakes Dojran and Prespa, located in the central part of the Balkan Peninsula. It can be regarded as a member of the “ D. mongolianum ” species group. It is characterized by specific, but not readily visible features, such as the absence of a thorn near the posterior valve margins, as well as setules between setae of the ventral valve inflection, and the presence of more chitinized integument. The discovery of this new species previously identified as " Diaphanosoma brachyurum (Lievin)" highlights the necessity of more detailed investigations of the zooplankton of Balkan lakes potentially populated by greater numbers of endemic cladoceran species. A short overview of the ancient lakes in the Central Balkans is provided.
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Overview of Sididae (Crustacea: Cladocera: Ctenopoda) of Northeast and East Thailand, with description of a new species of the genus Diaphanosoma
Zootaxa, 2008Co-Authors: Nikolai M. Korovchinsky, La-orsri SanoamuangAbstract:The investigation of an extensive collection of zooplankton samples from Northeast and East Thailand has revealed 10 species of the family Sididae, members of which often were mostly frequently distributed and abundant among Cladocera. Of seven species of the genus Diaphanosoma, one is new to science (D. elongatum sp. nov.) and two others, D. senegal and D. macrophthalma, new to Thailand. The genus Pseudosida is represented by P. szalayi instead of P. bidentata incorrectly recorded previously. Eleven species of Sididae are now known from Northeast Thailand and 12 from the whole country. The highest frequency occurrence and abundance were observed in D. excisum, D. dubium, Latonopsis australis, and P. szalayi while other species were more infrequent (D. sarsi) or rare. Sididae species were often observed co-occurring in different combinations, among them up to three-four species of Diaphanosoma. The rare species D. senegal frequently co-occurred with large Branchiopoda. Most Sididae of Northeast Thailand are of tropical origin while others (D. dubium, D. macrophthalma, Sida crystallina) have penetrated here from more northern latitudes.
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Review of Sididae (Crustacea: Cladocera: Ctenopoda) of the Pacific Ocean Islands, with description of a new species of Diaphanosoma from West Samoa
Hydrobiologia, 2001Co-Authors: Nikolai M. KorovchinskyAbstract:Review of the Sididae of the Pacific Ocean islands revealed only three species (Diaphanosoma sarsi s. l., Latonopsis australis s. l., and L. brehmi) so far known from New Caledonia, Vanuatu (New Hebrides), Fiji, Guam Island, and Hawaii. Study of museum and other additional material made it possible to describe a new species, D. samoaensis, from West Samoa, the first record of an endemic sidid on a small ocean island. Its mode of speciation is discussed.