Hydrology and water resources in Caspian Sea
Precipitation is the main driver of the water balance variability of the water over space and time, and changes in precipitation have very important implications for hydrology and water resources. Variations in precipitation over daily, seasonal, annual, and decadal time scales influence hydrolog...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-10-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/374/113/2016/piahs-374-113-2016.pdf |
| Summary: | Precipitation is the main driver of the water balance variability of the
water over space and time, and changes in precipitation have very important
implications for hydrology and water resources. Variations in precipitation
over daily, seasonal, annual, and decadal time scales influence hydrological
variability over time in a catchment. Flood frequency is affected by changes
in the year-to-year variability in precipitation and by changes in short-term
rainfall properties. Desiccation of the Caspian Sea is one of the world's
most serious ecosystem catastrophes. The Persian Sturgeon (<i>Acipenser
persicus</i>) caught under 10 m depth using bottom trawl net by research vessel
during winter 2012, summer and winter 2013 and spring 2014 in east, central
and west of southern parts of Caspian Sea, then, their diets were
investigated. During 136 trawling in the aimed seasons, Persian sturgeon with
1 to 2 years old and 179.67 × 0.2 g (body weight) and 29.97 ± 0.4 cm (Total length) captured. Examination of stomach contents in the
sturgeon specimens revealed that the food spectrum was composed of bony
fishes (<i>Neogobius</i> sp., <i>Atherina</i> sp. and <i>Clupeonella
delicatula</i>), invertebrates belonging to the family Ampharetidae polychaeta
worms including (<i>Hypanai</i> sp. and <i>Nereis diversicolor</i>),
various crustaceans (<i>Gammarus</i> sp. and <i>Paramysis</i> sp.).
Investigation on stomach contents of sturgeon <i>Acipenser persicus</i>
caught under 10 m depth in 2012 to 2013 surveys showed that there is
significant difference in the consumed food. The most food diversity have
been observed in winter 2013, also Polychaeta is the primary consumed food
and crustacean is the secondary one (<i>P</i> > 0.05), no new types of
food (such as bony fishes or benthics) have been observed on food chain of
<i>Acipenser persicus</i> and shows no significant difference
(<i>P</i> > 0.05). |
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| ISSN: | 2199-8981 2199-899X |