Salinity Factor in the Microevolution of Fishes and Redistribution of Age Groups of Altai Osman Oreoleuciscus potanini (Cyprinidae) in Ayrag and Khyargas Lakes, Mongolia

Mironovsky, A. N.; Mavrin, A. S.; Kozhara, A. V.; Slynko, Yu. V.

doi:10.1134/s106741361903010x

Cited by 3 publications

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“…The infection intensity of these parasites were also low in the lakes Khar and Khar Us. It is likely that, despite the ability of fish to exist in conditions of higher salinity (Mironovsky et al, 2019), parasites have not managed to adapt to these conditions. Alternatively, another possible reason for the absence of these parasites in Lake Durgun is a decrease of invertebrates in the biomass.…”

Section: Resultsmentioning

confidence: 99%

Parasites of Oreoleuciscus potanini (Cyprinidae) from lakes of Khar Us Nuur National Park (Mongolia)

Lebedeva¹,

Mendsaikhan²,

Yakovleva³

et al. 2020

Nat. Conserv. Res.

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Freshwater ecosystems of Mongolia belong to the three major Central Asian drainage systems: Arctic drainage, Amur River drainage, and Central Asian Internal drainage. The Great Lakes Depression takes considerable part of the latter. One of the few fish species living there, Oreoleuciscus potanini, is the most common and widespread endemic species in the Central Asian region. Parasitological surveys on O. potanini from the Great Lakes Depression have not occurred regularly in recent years. Consequently, this study was conducted to explore the species diversity of helminth parasites in O. potanini in the three lakes of Khar Us Nuur National Park. In total, 52 O. potanini specimens were collected from the lakes Khar, Khar Us and Durgen and sampled in August 2012. In addition to the parasites, the age and diet spectrum of the fish species were studied. The fish were examined for infection with ecto-and endo-macroparasites. The species composition of Diplostomum spp. metacercariae from the eyes of fish was investigated using a molecular approach. In the lakes Khar and Khar Us the fish age ranged from four to 32 years old and from eight to 35 years old, respectively. Fish of four age groups (9, 10, 11 and 14 years old) were in Lake Durgen. Algae and various insects, including Chironomida larvae were the main food of the O. potanini in all three lakes. When the diet was investigated we found that in Lake Durgen Cladocera crustaceans were the significant component in the fish diet, and no fish was found in the O. potanini diet there. During the study 26 parasites species were identified from the three lakes. The total fauna is represented by four phyla, including Acanthocephala (one species), Annelida (one species), Nematoda (four species), Platyhelminthes (20 species). The last group was the most numerous and diverse, including three species of Cestoda, six species of Monogenea and 11 species of Trematoda. Five species of parasites were specific to O. potanini only (monogeneans Gyrodactylus mongolicus, G. oreoleucisci, G. pewsowi, nematodes Philometra oreoleucisci and Rhabdochona humili). The other helminthes exhibited a low host-specificity, infecting a wide range of fishes in the Holarctic. The larvae of endohelminthes predominate in the parasite fauna. The majority of these parasites enter the fish via various invertebrate species during O. potanini's feeding. Our study provided novel data on the species diversity of Diplostomum spp. metacercaria in O. potanini's eyes. They were represented by three species: Diplostomum spathaceum, D. pseudospathaceum and Diplostomum sp. LIN2. The species richness and diversity of parasites were much higher for O. potanini from the lakes Khar and Khar Us (26 species), than that for O. potanini of Lake Durgen (15 species). The possible reason for the absence of some parasites in Lake Durgan is an increased water salinity. It is likely that, despite the potential for the fish to exist under conditions of an elevated salinity, parasites (or their invertebrate hosts) are not adapted to i...

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Section: Resultsmentioning

confidence: 99%

Parasites of Oreoleuciscus potanini (Cyprinidae) from lakes of Khar Us Nuur National Park (Mongolia)

Lebedeva¹,

Mendsaikhan²,

Yakovleva³

et al. 2020

Nat. Conserv. Res.

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Ichthyofauna of the Fresh and Brackish Waters of Russia and Adjacent Areas: Annotated List with Taxonomic Comments. 2. Order Cypriniformes, Suborders Catostomoidei, Cobitoidei and Cyprinoidei

et al. 2023

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Effects of the Habitat and Genotype on Osteological Traits in Landlocked and Anadromous Ecological Forms of Atlantic Salmon Salmo salar Linnaeus, 1758

et al. 2022

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Studies of speciation and intraspecific differentiation in salmonid fishes are traditionally based on analysis of osteological traits. In the current study the variation of osteological traits was compared between two Atlantic salmon forms: anadromous and landlocked. Each form was represented by three samples: one from a wild population, and two from hatcheries; i.e., we studied six samples in total. In total, 45 osteological characters were analyzed. Differences between the forms were found to be genetically determined to a substantial extent. The factor “origin” explained 48% of the total morphological difference between the fish samples; the factor “habitat”, 32%; and their interaction, 14%. Phenotypic plasticity of the anadromous form was observed to be lower than that of the landlocked form. We consider that the higher phenotypic plasticity may compensate for a decrease in genetic diversity which is observed in landlocked forms of the species.

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Salinity Factor in the Microevolution of Fishes and Redistribution of Age Groups of Altai Osman Oreoleuciscus potanini (Cyprinidae) in Ayrag and Khyargas Lakes, Mongolia

Cited by 3 publications

References 1 publication

Parasites of Oreoleuciscus potanini (Cyprinidae) from lakes of Khar Us Nuur National Park (Mongolia)

Parasites of Oreoleuciscus potanini (Cyprinidae) from lakes of Khar Us Nuur National Park (Mongolia)

Ichthyofauna of the Fresh and Brackish Waters of Russia and Adjacent Areas: Annotated List with Taxonomic Comments. 2. Order Cypriniformes, Suborders Catostomoidei, Cobitoidei and Cyprinoidei

Effects of the Habitat and Genotype on Osteological Traits in Landlocked and Anadromous Ecological Forms of Atlantic Salmon Salmo salar Linnaeus, 1758

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