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Table 3
Species composition and parts of the different species in total macrozoobenthos biomass g (wet weight) m-2 in Lake Qarun during 1974–2013.
| Species | 1974–1977* | 1989** | 1994** | 1995** | 1999/2000** | 2006*** | 2008 | 2011 | 2012 | 2013 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Coelenterata |
|||||||||||
| Aiptasiogeton cf. pellucidus (Hollard, 1848) | 0 | 1.3 | 3.4 | 1.2 | 1.9 | 3.0 | 1.1 | 1.3 | 0.2 | 0.3 | |
| Obelia sp. | + | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Arthropoda | |||||||||||
| Brachynotus sexdentatus (Risso, 1827) | 0 | 3.3 | 2.9 | 1.5 | 17.3 | 1.3 | 1.4 | 9.5 | 15.1 | 4.2 | |
| Fistulobalanus pallidus (Darwin, 1854) | 4.8 | 29.9 | 44.1 | 32.5 | 7.9 | 7.7 | 3.4 | 3.7 | 2.0 | 4.6 | |
| Gammarus aequicauda (Martynov, 1931) | ? | <0.1 | <0.1 | <0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0 | |
| Monocorophium acherusicum (Costa, 1853) | 0 | 1.7 | 1.0 | 0.5 | 0.1 | 0.1 | 2.2 | 0.4 | 0.6 | 1.4 | |
| Palaemon elegans Rathke, 1837 | + | ? | ? | ? | ? | ? | ? | ? | ? | ? | |
| Platorchestia platensis (Krøyer, 1845) | + | ? | ? | ? | ? | ? | ? | ? | ? | ? | |
| Sphaeroma serratum (Fabricius, 1787) | + | + | 0.4 | 0.1 | 0.4 | 1.0 | 0.8 | 0.5 | 0.6 | 0 | |
| Chironomidae, larvae | ? | ? | ? | <0.1 | <0.1 | 0.3 | <0.1 | <0.1 | 1.6 | 0.1 | |
| Annelida | |||||||||||
| Ficopomatus enigmaticus (Fauvel, 1923) | 0 | 0 | 0 | 0 | 0 | 2.4 | 3.9 | 4.0 | 0.9 | 1.8 | |
| Hediste diversicolor (O.F. Müller, 1776) | 1 | 10.7 | 11.3 | 3.0 | 4.9 | 4.0 | 5.9 | 1.7 | 19.3 | 7.9 | |
| Hydriod sp. | 0 | 0 | 0 | 0 | 3.2 | 0 | 0 | 0 | 0 | 0 | |
| Polydora cornuta Bosc, 1802 | 0 | 0 | 0.4 | 0.3 | 0.7 | 0 | 0 | 0 | 0 | 0 | |
| Polydora hoplura Claparède, 1869 | 0 | 0 | 0 | 0 | 0 | 0.3 | 0.2 | 0.1 | 0.3 | 0.5 | |
| Tubificidae spp. | ? | ? | <0.1 | 0.1 | 0.6 | 0.1 | 0.1 | 0.1 | 1.0 | 0.4 | |
| Mollusca | |||||||||||
| Bulla ampulla Linnaeus, 1758 | 0 | 0 | 0 | 0 | 1.6 | 5.5 | 7.4 | 1.1 | 3.5 | 3.7 | |
| Cerastoderma glaucum (Bruguière, 1789) | 69.8 | 30.7 | 22 | 34.7 | 31.3 | 41.5 | 12.2 | 25.2 | 30.9 | 44.6 | |
| Cleopatra bulimoides (Olivier, 1804) | + | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Melanoides tuberculata (O. F. Müller, 1774) | + | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Monodonta sp. | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.1 | 2.1 | 0 | |
| Nassarius cuvierii (Payraudeau, 1826) | 0 | 0 | 0 | 0 | 0 | 0.1 | 0 | 1.3 | 1.2 | 2.9 | |
| Physa acuta Draparnaud, 1805 | + | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Polititapes aureus (Gmelin, 1791) | 8.0 | 18.5 | 10.0 | 23.0 | 27.6 | 28.4 | 71.4 | 47.7 | 20.8 | 25.6 | |
| Potamides conicus (Blainville, 1829) | 10.5 | ? | 0.7 | 1.8 | 1.4 | 1.0 | 8.8 | 0.6 | 0.4 | 0.6 | |
| Hydrobia aponensis Martens, 1855 | 5.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Semisalsa sp. | 0 | 0 | 1.5 | 0.3 | 0.3 | 0.1 | 0.4 | 2.5 | 1.2 | 1.7 | |
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