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Impact of water salinity on long-term dynamics and spatial distribution of benthic invertebrates in the Small Aral Sea

Elena Krupa
Elena Krupa
 oraz 
Olga Grishaeva
Olga Grishaeva
   | 10 gru 2019
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Article Category: Research Article
Data publikacji: 10 gru 2019
Zakres stron: 355 - 367
Otrzymano: 05 mar 2019
Przyjęty: 26 kwi 2019
DOI: https://doi.org/10.2478/ohs-2019-0032
© 2019 Faculty of Oceanography and Geography, University of Gdańsk, Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Map of macrozoobenthos sampling in the Small Aral Sea. Circles indicate macrozoobenthos sampling locations; blue arrows – the direction of water mass movement. The numbers indicate bays: 1 – Shevchenko, 2 – Saryshyganak, 3 – Butakova
Map of macrozoobenthos sampling in the Small Aral Sea. Circles indicate macrozoobenthos sampling locations; blue arrows – the direction of water mass movement. The numbers indicate bays: 1 – Shevchenko, 2 – Saryshyganak, 3 – Butakova

Figure 2

Distribution of depths (A), transparency (B) and water temperature (C) in the Small Aral Sea, 1997
Distribution of depths (A), transparency (B) and water temperature (C) in the Small Aral Sea, 1997

Figure 3

Long-term biomass dynamics of benthic invertebrates in the Small Aral Sea. A – Abra ovata, B– Hediste diversicolor, C– Caspiohydrobia sp., D– Cerastoderma glaucum
Long-term biomass dynamics of benthic invertebrates in the Small Aral Sea. A – Abra ovata, B– Hediste diversicolor, C– Caspiohydrobia sp., D– Cerastoderma glaucum

Figure 4

Biomass distribution of background species of benthic invertebrates and water salinity of the Small Aral Sea
Biomass distribution of background species of benthic invertebrates and water salinity of the Small Aral Sea

Figure 5

Distribution of biomass of background species of benthic invertebrates within the salinity gradient of water in the Small Aral Sea. A – Abra ovata, B– Hediste diversicolor, C– Caspiohydrobia sp., D– Cerastoderma glaucum
Distribution of biomass of background species of benthic invertebrates within the salinity gradient of water in the Small Aral Sea. A – Abra ovata, B– Hediste diversicolor, C– Caspiohydrobia sp., D– Cerastoderma glaucum

Water salinity in the Small Aral Sea

Salinity, PSU
Month, year average min.–max
June 1996 20.4 –
June 1997 19.0 1.0–25.0
June 1998 14.5 1.2–28.3
June 2001 18.6 12.8–26.8
June 2002 15.1 2.7–26.8
August 2004 13.9 2.6–35.3
May–June 2005 10.8 1.9–23.9
May–June 2006 8.9 4.0–11.5
July–September 2006 11.2 9.2–17.3
May–June 2007 6.3 1.2–10.2
August 2007 10.5 –
June–July 2008 11.8 5.6–17.2

Salinity limits and optimum salinity for dominant species of macrozoobenthos in the Aral Sea

Species name Salinity limits, PSU Optimum salinity, PSU
1–5literature data our data experimental data our data
A. ovata 5.0–42.0 1.0–35.3 610.0–25.0 17.0–27.0
Caspiohydrobia sp. 6.0–42.0 10.0–35.3 no data 17.0–27.0
C. glaucum 7.0–36.0 10.0–35.3 38.1–27.3 17.0–27.0
H. diversicolor 0.5–40.0 1.0–35.3 no data 1.0–27.0

Spearman’s rank correlation coeffcients between the biomass of background species of benthic invertebrates and the water salinity of the Small Aral Sea, at p<0.05

Month, year Salinity, PSU Spearman’s rank correlation coefficients
A. ovata H. diversicolor Caspiohydrobia sp. C. glaucum
June 1997 19.0 0.720 – 0.615 –
June 1998 14.5 0.728 – 0.615 –
June 2001 18.6 – – – 0.488
June 2002 15.1 0.604 – 0.595 0.669
August 2004 13.9 0.674 – 0.524 0.793
May–June 2005 10.8 0.575 −0.619 – 0.704
May–June 2006 8.9 – – – –
July–September 2006 11.2 0.748 0.656 – 0.665
May–June 2007 6.3 0.796 – – –
August 2007 11.8 0.748 0.656 – 0.666
June–July 2008 – – – – –

Long-term dynamics of quantitative variables of macrozoobenthos in different parts of the Small Aral Sea

Year Impact zone of the Syrdarya River Shevchenko, Saryshyganak, and Butakov bays Eastern part of the sea Open sea Mean
Abundance, specimens m−2
2001 33 080 ± 1366 3960 ± 1998 11 110 ± 6830 2670 ± 1542 4274 ± 1229
2002 1184 ± 315 5413 ± 1183 11 237 ± 4304 3040 ± 1280 4540 ± 1084
2003 1112 ± 127 2301 ± 839 9997 ± 7624 2010 ± 693 3321 ± 1600
2004 280 ± 79 1467 ± 109 1774 ± 627 1210 ± 601 1014 ± 307
2005 628 ± 171 400 ± 162 1774 ± 1107 400 ± 134 781 ± 210
2006 280 ± 133 720 ± 600 1907 ± 674 180 ± 115 681 ± 261
2007 528 ± 92 453 ± 150 610 ± 30 270 ± 134 442 ± 73
2008 224 ± 78 373 ± 58 1599 ± 492 470 ± 112 641 ± 140
mean 4664 ± 4061 1886 ± 668 5001 ± 1703 1281 ± 406 1962 ± 624
Biomass, g m−2
1996 115.4 ± 30.7 390.9 ± 145.3 132.15 ± 75.4 95.5 ± 41.0 169.7 ± 43.9
1997 16.0 ± 3.8 148.7 ± 115.5 231.0 ± 89.5 130.7 ± 72.3 125.2 ± 40.7
1998 13.10 ± 3.9 116.1 ± 83.0 271.1 ± 99.2 157.4 ± 84.8 134.2 ± 40.0
2000 67.4 ± 35.37 323.5 ± 54.0 302.4 ± 105.5 144.0 ± 49.9 189.7 ± 41.9
2001 160.7 ± 75.0 214.9 ± 107.9 406.2 ± 237.4 182.5 ± 106.8 206.7 ± 48.7
2002 10.5 ± 2.6 109.4 ± 65.7 434.9 ± 89.2 249.6 ± 134.5 192.1 ± 53.8
2003 4.5 ± 1.0 37.5 ± 29.2 269.8 ± 207.8 147.9 ± 98.7 94.7 ± 50.2
2004 5.8 ± 2.7 0.6 ± 0.5 114.1 ± 10.3 68.3 ± 46.8 50.4 ± 18.6
2005 7.0 ± 0.7 23.7 ± 17.6 131.0 ± 43.0 21.6 ± 12.0 40.7 ± 17.0
2006 3.1 ± 1.9 68.5 ± 62.8 90.6 ± 8.9 18.0 ± 17.0 38.6 ± 15.0
2007 18.6 ± 5.8 8.2 ± 5.7 39.3 ± 2.7 26.2 ± 9.6 22.3 ± 5.1
2008 6.5 ± 2.4 10.9 ± 1.8 52.7 ± 12.9 15.8 ± 4.4 20.6 ± 4.9
mean 35.7 ± 14.9 121.1 ± 37.1 206.3 ± 38.4 104.8 ± 22.0 107.1 ± 20.6
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Język:
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