Does salinity change determine zooplankton variability in the saline Qarun Lake (Egypt)?

El-Shabrawy, Gamal M.; Anufriieva, Elena; Germoush, Mousa O.; Goher, Mohamed E.; Shadrin, Nickolai

doi:10.1007/s00343-015-4361-x

Cited by 28 publications

(19 citation statements)

References 19 publications

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“…Totality of available data on salinity since 1901 (Naguib, 1958;Ishak and Abdel-Malek, 1980;Meshal and Morcos, 1984;Soliman, 1991;Sabae and Ali, 2004;Abd Ellah, 2009;El-Shabrawy and Dumont, 2009;Abdel-Satar et al, 2010;El-Shabrawy et al, 2015) was summarized (Figure 2). We see that there was strong salinity increase since 1901 (13 g.L −1 ) to approximately 2000, which may be approximated by the equation (R = 0.935, p = 0.0001):…”

Section: Long-term Changes Of Abiotic Characteristicsmentioning

confidence: 99%

“…We used data from literature (Sabae and Ali, 2004;Abd Ellah, 2009;El-Shabrawy and Dumont, 2009;Abdel-Satar et al, 2010;El-Shabrawy et al, 2015) and analyzed a longterm change of K concentration in the lake. Proportion K/Na decreased and its inter-annual dynamics may be approximated (R = −0.888, p = 0.001):…”

Section: Long-term Changes Of Abiotic Characteristicsmentioning

confidence: 99%

“…There is another point of view that salinity variation is not a main cause of zooplankton changes in the lake during the last decades (El-Shabrawy et al, 2015). Is fluctuating salinity the main determinant of biotic changes in Lake Qarun?…”

Section: Introductionmentioning

confidence: 99%

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Long-term changes of physicochemical parameters and benthos in Lake Qarun (Egypt): Can we make a correct forecast of ecosystem future?

Shadrin

El-Shabrawy

Anufriieva

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

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-Biotic changes and a salinity increase (from 13 to 40 g.L −1 ) occurred in Lake Qarun (Egypt) since 1901. Was salinity increasing a cause of observed biotic changes? To answer this question we used benthos as a model group. Benthos and water sampling was conducted in different seasons (2008−2013). Comparing our and literature data, we discuss the long-term trends and possible causes of benthos changes. Salinity reached 3 g.L −1 in middle of 19th century; and biotic changes caused by this were started. From middle 19th century to 1928 a biotic transformation was driven by the salinity increase; after 1928 a regular alien species introduction caused that a marine community formed. In 1970−2000 eutrophication played a main role in species composition changes. In 2014 ctenophore Mnemiopsis leidyi introduced in the lake; eutrophication, chemical pollution, and a population dynamics of this ctenophore may be main drivers of the ecosystem change now. Benthos biomass gradually decreased during interval 1975−2013 without any correlation with salinity change. A variety of other factors than salinity may be significant in determining the structure and dynamics of communities, and we conclude that we have a small chance to make a correct forecast of possible future ecosystem changes in Lake Qarun.

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Section: Long-term Changes Of Abiotic Characteristicsmentioning

confidence: 99%

Section: Long-term Changes Of Abiotic Characteristicsmentioning

confidence: 99%

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Long-term changes of physicochemical parameters and benthos in Lake Qarun (Egypt): Can we make a correct forecast of ecosystem future?

Shadrin

El-Shabrawy

Anufriieva

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

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“…dominated. Salinity changes in an observed range scarcely have been a direct cause of spatial and temporal variability of tintinnid taxocene structure as was shown for plankton spatial and long-term variability in the Qarun saline lake in Egypt (El-Shabrawy et al, 2015). Long-term changes in wind regime (direction and intensity) often lead to variability of water exchange between a lagoon and a sea, causing sharp shifts in plankton structure (Shadrin and Anufriieva, 2013).…”

Section: Long-term Changesmentioning

confidence: 99%

Tintinnina (Ciliophora) and Foraminifera in plankton of hypersaline Lagoon Bardawil (Egypt): spatial and temporal variability

El-Shabrawy¹,

Anufriieva²,

Shadrin³

2018

Turk J Zool

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Lagoon Bardawil, belonging to the few hypersaline lagoons in the Mediterranean Sea, is located in the middle of the Sinai coast. Composition, distribution, and seasonal dynamics of large planktonic tintinnids and foraminifera at 12 stations in the lagoon were studied in 2009 and 2010. Fifteen species of Ciliophora (Tintinnina) and two species of Foraminifera were identified. The occurrence of different species varied greatly in the study period: two species were found in 42% to 49% of all samples, two species in 21% to 23%, 4 species in 10% to 20%, and 10 species in 1% to 5%. Only three species were found throughout the year. The average total number of all recorded protozoa varied from 2333 ind./m 3 (spring) to 13,733 ind./m 3 (winter): Tintinnina from 1250 ind./m 3 (spring) to 12,867 ind./ m 3 (winter) and Foraminifera from 200 ind./m 3 (autumn) to 1083 ind./m 3 (spring). The distribution of total abundance of tintinnids and foraminifers in the lagoon area was close to random in summer and spring; during autumn and winter, it was aggregated. Tintinnid and foraminifera studies in Lagoon Bardawil were carried out previously ; summarizing all data, it was found that interannual differences may be explained by stochastic causes and nondirected climate fluctuations.

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“…В настоящее время происходят транс-формации разных водных экосистем, вызван-ные изменениями глобальной климатической системы и антропогенной деятельностью (Ezhova et al, 2005;Conley et al, 2007;Аладин, Плотников, 2008;Shadrin, Anufriieva, 2013;El-Shabrawy et al, 2015). Индикация этих из-менений, понимание взаимосвязи причин и следствий -актуальные задачи современных экологических исследований водоемов.…”

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Transformation of Gulf Sivash (the Sea of Azov) in Conditions of Growing Salinity: Changes of Meiobenthos and Other Ecosystem Components (2013-2015)

Shadrin¹,

Сергеева²,

Anufriieva³

et al. 2016

J. Sib. Fed. Univ., Biol.

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Does salinity change determine zooplankton variability in the saline Qarun Lake (Egypt)?

Cited by 28 publications

References 19 publications

Long-term changes of physicochemical parameters and benthos in Lake Qarun (Egypt): Can we make a correct forecast of ecosystem future?

Long-term changes of physicochemical parameters and benthos in Lake Qarun (Egypt): Can we make a correct forecast of ecosystem future?

Tintinnina (Ciliophora) and Foraminifera in plankton of hypersaline Lagoon Bardawil (Egypt): spatial and temporal variability

Transformation of Gulf Sivash (the Sea of Azov) in Conditions of Growing Salinity: Changes of Meiobenthos and Other Ecosystem Components (2013-2015)

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