The problem of invaders in the Caspian Sea in the context of the findings of new zoo- and phytoplankton species from the Black Sea

Shiganova, Tamara A.; Musaeva, Eteri I; Паутова, Л. А.; Bulgakova, Yu. V.

doi:10.1007/s10525-005-0011-8

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…Even though Mills and Sommers (1995) consider the species native to the Black Sea, we consider it of North Atlantic Fig. 6 The estimated number of samples required to detect 50, 75 and 95% of the observed species richness (S obs ) in the harbour Table 4 Estimated species richness (mean, standard error and 95% confidence interval) based on non-parametric estimators of species richness computed using EstimateS 8.2 (Colwell 2009 origin similar to Zaitsev and Mamaev (1997) and Shiganova et al (2005). The striped barnacle, B. amphitrite, a widespread species found also in brackish waters, is a typical component of the fouling communities.…”

Section: Discussionmentioning

confidence: 86%

Early detection of potentially invasive invertebrate species in Mytilus galloprovincialis Lamarck, 1819 dominated communities in harbours

et al. 2012

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Constanţa harbour is a major port on the western coast of the semi-enclosed Black Sea. Its brackish waters and low species richness make it vulnerable to invasions. The intensive maritime traffic through Constanţa harbour facilitates the arrival of alien species. We investigated the species composition of the mussel beds on vertical artificial concrete substrate inside the harbour. We selected this habitat for study because it is frequently affected by fluctuating levels of temperature, salinity and dissolved oxygen, and by accidental pollution episodes. The shallow communities inhabiting it are thus unstable and often restructured, prone to accept alien species. Monthly samples were collected from three locations from the upper layer of hard artificial substrata (maximum depth 2 m) during two consecutive years. Ten alien macroinvertebrate species were inventoried, representing 13.5% of the total number of species. Two of these alien species were sampled starting the end of summer 2010, following a period of high temperatures that triggered hypoxia, causing mass mortalities of benthic organisms. Based on the species accumulation curve, we estimated that we have detected all benthic alien species on artificial substrate from Constanţa harbour, but additional effort is required to detect all the native species. Our results suggest that monitoring of benthic communities at small depths in harbours is a simple and useful tool in early detection of potentially invasive alien species. The selected habitat is easily accessible, the method is low-cost, and the samples represent reliable indicators of alien species establishment. Keywords Constanţa harbour Á Black Sea Á Invertebrates Á Alien species Á Recolonization Á Monitoring Communicated by Heinz-Dieter Franke.

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Section: Discussionmentioning

confidence: 86%

Early detection of potentially invasive invertebrate species in Mytilus galloprovincialis Lamarck, 1819 dominated communities in harbours

et al. 2012

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“…In addition, the Volga-Don Canal, which links the Don River and the Sea of Azov to the Volga River and the Caspian Sea, allows commercial vessels to move between these basins. Discharge of contaminated ballast water from the Black/Azov Sea likely accounts for invasion of the Caspian Sea (Shiganova et al 2004(Shiganova et al , 2005.…”

Section: Discussionmentioning

confidence: 99%

Multiple introductions and invasion pathways for the invasive ctenophore Mnemiopsis leidyi in Eurasia

et al. 2010

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The introduction and spread of non-indigenous species (NIS) in marine ecosystems accelerated during the twentieth century owing to human activities, notably international shipping. Genetic analysis has proven useful in understanding the invasion history and dynamics of colonizing NIS and identifying their source population(s). Here we investigated sequence variation in the nuclear ribosomal Internal Transcribed Spacer region of the ctenophore Mnemiopsis leidyi, a species considered one of the most invasive globally. We surveyed four populations from the native distribution range along the Atlantic coasts of the United States and South America, as well as six populations in the introduced range from the Black, Azov, Caspian and Baltic seas. Allelic and nucleotide diversity of introduced populations were comparable to those of native populations from which they were likely drawn. Introduced populations typically exhibited lower genetic differentiation (F ST = -0.014-0.421) than native populations (F ST = 0.324-0.688). Population genetic analyses supported the invasion of Eurasia from at least two different pathways, the first from the Gulf of Mexico (e.g., Tampa Bay) to the Black Sea and thence to the Caspian Sea, the second from the northern part of the native distribution range (e.g., Narragansett Bay) to the Baltic Sea. The relatively high genetic diversity observed in introduced populations is consistent with large inocula and/or multiple invasions, both of which are possible given ballast water transport and the extensive native distribution of the ctenophore in the Atlantic Ocean.

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“…The grazing effect of M. leidyi was obvious because species which were dominant during all seasons before 2000 were absent or found only in very low numbers during the bloom time of M. leidyi in summer–autumn. It is not clear to what extent M. leidyi is responsible for the disappearance of endemic Copepoda and Cladocera species such as Eurytemora grimmi, Limnocalanus grimaldii, Cercopagis pengoi and Polyphemus exiguous because other invader species, such as Acartia tonsa and Pleopis polyphemoides were more successful competitors compared with the endemic Caspian Sea fauna, which is very sensitive to disruption by invader species (Dumont, 2000; Ivanov et al , 2000; Shiganova et al , 2005). In fact M. leidyi is not responsible for the disappearance of a multiplicity of endemic Copepoda and Cladocera species, as listed in Roohi et al (2008), because they were already absent in the south-western Caspian Sea during 1996 before the invasion of the ctenophore to the Caspian Sea.…”

Section: Resultsmentioning

confidence: 99%

Biodiversity, distribution and abundance of zooplankton in the Iranian waters of the Caspian Sea off Anzali during 1996–2010

Bagheri¹,

Niermann²,

Mansor

et al. 2013

J. Mar. Biol. Ass.

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The mesozooplankton of the south-western Caspian Sea, off Anzali, sampled from 1996–2010, had undergone severe changes, especially after the year 2001, when the invasive ctenophore Mnemiopsis leidyi bloomed for the first time. Native species vanished or decreased, while invasive species such as Pleopis polyphemoides, Acartia tonsa, M. leidyi and the larvae of Balanus sp., plus Hediste diversicolor dominated the zooplankton. It could be stated that the increasing amount of nutrients since the early 1980s led to a decrease of endemic species and smoothed the way for opportunistic invader species, which outcompeted and depleted the endemic species in their turn. However, the major changes in the zooplankton community and possibly the blooming of M. leidyi during 2001–2002 were triggered by changing weather patterns, when a period with heavy rain at the end of the 1990s was followed by a prolonged drought (2001–2002). It is not clear to what extent M. leidyi was responsible for the disappearance of endemic Copepoda and Cladocera species such as Eurytemora grimmi, Limnocalanus grimaldii, Cercopagis pengoi, and Polyphemus exiguous, because the mesozooplantic invader species seemed to be more successful competitors than the endemic Caspian Sea fauna. Compared with other areas of the Caspian Sea, the development of the M. leidyi stock was moderate in the area under investigation. Mnemiopsis leidyi numbers and biomass increased from the beginning of sampling in 2001 to about 600 n.m−3 and 40–60 g wet weight m−3 until 2003. Since then the stock oscillated in this range until 2010.

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The problem of invaders in the Caspian Sea in the context of the findings of new zoo- and phytoplankton species from the Black Sea

Cited by 11 publications

References 5 publications

Early detection of potentially invasive invertebrate species in Mytilus galloprovincialis Lamarck, 1819 dominated communities in harbours

Early detection of potentially invasive invertebrate species in Mytilus galloprovincialis Lamarck, 1819 dominated communities in harbours

Multiple introductions and invasion pathways for the invasive ctenophore Mnemiopsis leidyi in Eurasia

Biodiversity, distribution and abundance of zooplankton in the Iranian waters of the Caspian Sea off Anzali during 1996–2010

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