The Caspian Sea Environment

Kostianoy, Andrey G.; Kosarev, Aleksey N.

doi:10.1007/b138238

Cited by 56 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Not assessed. It was reported as extinct by Kostianoy and Kosarev (2005, and references therein). If D.elata is accepted as a valid species, it might qualify for the same conservation status as D.caspia (critically endangered, possibly extinct; von Rintelen and Van Damme 2011b).…”

Section: Systematic Cataloguementioning

confidence: 98%

“…Mytilasterminimus has successfully replaced Dreissenacaspia and D.elata between 1938 and 1957 (Kostianoy and Kosarev 2005) in the Caspian Sea. Logvinenko and Starobogatov (1969) reported this species from the southern areas of the northern Caspian Sea, in the middle and the southern Caspian Sea down to 35–50 m water depth.…”

Section: Systematic Cataloguementioning

confidence: 99%

“…Its apparently distinct morphology and autecological preferences suggest it is different from D.polymorpha , but it will require molecular comparison to investigate whether it concerns a mere morph that has undergone “ecological release” (Kohn 1972) or is a different species. However, no living specimens of D.elata have been recorded since 1957 (Kostianoy and Kosarev 2005) when its Caspian habitats were invaded by Mytilasterminimus .…”

Section: Systematic Cataloguementioning

confidence: 99%

See 2 more Smart Citations

Mollusc species from the Pontocaspian region – an expert opinion list

Fp¹,

Neubauer²,

Vv³

et al. 2019

View full text Add to dashboard Cite

Defining and recording the loss of species diversity is a daunting task, especially if identities of species under threat are not fully resolved. An example is the Pontocaspian biota. The mostly endemic invertebrate faunas that evolved in the Black Sea – Caspian Sea – Aral Sea region and live under variable salinity conditions are undergoing strong change, yet within several groups species boundaries are not well established. Collection efforts in the past decade have failed to produce living material of various species groups whose taxonomic status is unclear. This lack of data precludes an integrated taxonomic assessment to clarify species identities and estimate species richness of Pontocaspian biota combining morphological, ecological, genetic, and distribution data. In this paper, we present an expert-working list of Pontocaspian and invasive mollusc species associated to Pontocaspian habitats. This list is based on published and unpublished data on morphology, ecology, anatomy, and molecular biology. It allows us to (1) document Pontocaspian mollusc species, (2) make species richness estimates, and (3) identify and discuss taxonomic uncertainties. The endemic Pontocaspian mollusc species richness is estimated between 55 and 99 species, but there are several groups that may harbour cryptic species. Even though the conservation status of most of the species is not assessed or data deficient, our observations point to deterioration for many of the Pontocaspian species.

show abstract

Section: Systematic Cataloguementioning

confidence: 98%

Section: Systematic Cataloguementioning

confidence: 99%

Section: Systematic Cataloguementioning

confidence: 99%

See 1 more Smart Citation

Mollusc species from the Pontocaspian region – an expert opinion list

Fp¹,

Neubauer²,

Vv³

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Many large rivers, notably the Volga, drain into the Caspian Sea, but no outlets exist; so water-levels (currently at 27 m below sea level (bsl)) are controlled by precipitation and evaporation over the water and its catchments (Kostianoy & Kosarev, 2005;. Three basins divide the water body, becoming progressively deeper towards the south.…”

Section: The Caspian Sea and Its Surroundingmentioning

confidence: 99%

Multi-proxy indicators in a Pontocaspian system: a depth transect of surface sediment in the SE Caspian Sea

Leroy¹,

Chalié²,

Wesselingh³

et al. 2018

Geol. Belg.

View full text Add to dashboard Cite

The response of large water-bodies to global change in terms of ecosystem services and economical value is a major concern. The Caspian Sea, the world's largest enclosed water-body, has a poorly-known water-level history, but observed changes are a hundred times faster than recent global sea-level rise. This ancient lake, characterised by brackish waters, is rich in endemic species; some of them have spread to similar environments worldwide. However, the ecology of Pontocaspian species remains poorly understood and must be studied in their original habitat. This work aims at improving the capacity to reconstruct Quaternary environments of the Pontocaspian region and to provide a benchmark for biodiversity turnover studies. A transect of surface sediment across a wide shelf was subjected to multidisciplinary analyses: stable isotopes, pollen, dinocysts, diatoms, foraminifers, ostracods and molluscs and vertical oceanographic profiles. Three depositional environments with characteristic communities were found: shore face, shelf and slope. Invasion impact was strongly felt by the molluscs. All biota groups, except diatoms, reflected high endemism. The radiocarbon reservoir effect is highlighted in differential 14 C ages for different groups. Understanding such discrepancies require detailed insight into reworking processes. Tephra presence in the sediment shows a potential for tephrochronology. Stable isotope ratios in ostracods appear to reflect temperature depth gradients. Our results provide a baseline for calibrating proxy data to the present Pontocaspian environment.

show abstract

“…Being the residue of ancient seas, the Caspian Sea is completely isolated from oceans now. It is a nondrainage brackish waterbody with profound seasonal and multiannual level oscillations (Kostianoy and Kosarev 2005;Chen et al 2017). Because of several transgressions and regressions, the history of the Caspian biota is dynamic: periods of faunal isolations and species extinctions alternated with species invasions (Grigorovich et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis confirms the freshwater origin of the endemic Caspian sponges (Demospongiae, Spongillida, Metschnikowiidae)

Sokolova

Palatov

Ицкович

2020

View full text Add to dashboard Cite

The Caspian Sea is a unique inland brackish waterbody inhabited by highly endemic fauna. This fauna consists of species of both marine and freshwater origin. Some Caspian invertebrates cannot be confidently referred to as animals of either origin. The endemic monophyletic family of sponges, Metschnikowiidae, is among them. Although these sponges are considered as fresh water in the modern literature, no researcher has seen them alive for many years, and its status is actually unconfirmed. Here, we present the first photos of Metschnikowia tuberculata Grimm, 1877 and report evidence for its freshwater origin based on analysis of ITS1 and ITS2 sequences and partial sequences of CO1 gene. According to the genetic analysis, M. tuberculata belongs to the order Spongillida. We observed specimens of diverse appearance, but their spicule complement proved to be similar, and ITS sequences were identical. Thus, we conclude that they belong to the same species. The obtained results expand our knowledge about the dispersal ability of freshwater sponges.

show abstract

The Caspian Sea Environment

Cited by 56 publications

References 0 publications

Mollusc species from the Pontocaspian region – an expert opinion list

Mollusc species from the Pontocaspian region – an expert opinion list

Multi-proxy indicators in a Pontocaspian system: a depth transect of surface sediment in the SE Caspian Sea

Genetic analysis confirms the freshwater origin of the endemic Caspian sponges (Demospongiae, Spongillida, Metschnikowiidae)

Contact Info

Product

Resources

About