Limnological study of the reservoir Sedlice near eliv. XII. Sublitoral and its fauna

Tpanek, Miroslav; Havlik, B.



Accession: 024952973

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The presented study on the fauna of the sublittoral of the Sedlice Reservoir dealt with some partial facts of the development of groups of organisms living on the bottom of this zone. There is no true littoral zone in the Sedlice Reservoir, therefore attention was paid to organisms of the sublittoral. A comparison was made of the organisms of the sublittoral of the Sedlice Reservoir with those of the reservoirs Knimiky and Bystricka. A similarity was found in the sublittoral of the middle part of every one of the compared reservoirs. The opinion was stated that the sublittoral fauna of the Sedlice Reservoir, besides its value as food for fish, plays an important sanitary role. A brilliant description of the sublittoral of the Sedlice Reservoir was given. In the part dealing with methodics, a description of the sampling devices (traps) as well as of the procedure of sample elaboration and treatment were given. It was estimated that the sublittoral fauna was influenced by the continual changes of the water level which shifts not only during a year but also even during a day. The qualitative as well as the quantitative composition of the sublittoral fauna depends to some extent upon the composition of the surface of the bottom. The greatest number of organisms caught in traps was noted at the end of spring, i.e. during May and June. The second numerically less apparent pulse on the Sedlice Reservoir occurs between August to September. The most abundant groups of organisms found in the traps were Tendipendidae, Hydracarinae and Ephemeroptera. A detailed description of the numerical development of the hydracarina group was given. Their greatest monthly average number was found in April 1957, 55 org./day/m2. Hydracarina, Branchiura, and Coleoptera were treated. In the Hydracarina group the species Piona coccinea was identified in 55%, Hygrobates longipalpis Herman in 23%, Limnesia maculata Koch in 7%, Lebertia fimbriata Sig. Thor in 3%, Piona rotunda Kramer in 1%, and Piona falax Thor in 1%. Only one representative of the Branchiura was found - Argulus foliaceus mostly in the middle part of the reservoir. Platambus maculatus L. is the most abundant representative of Coleoptera. This species was trapped in 80% of the total number of cases. The species Lacophilus hyalinus Deg. was trapped in 14%, Hydroporus lineatus L. in 3%, H. palustris L. in 1.5% as regards to family of Dystiscidae. Only one representative of Gyrinidae was trapped, namely Orectechilus villosus Mul. The maximal number of trapped Ephemeroptera was noted in May 1958, 40 org/day/m2. The main period when Ephemeroptera are found on the Sedlice Reservoir is in Spring and early summer. The maximal number of Chironomidae was found in July, 1956 and May 1958, 94 org./day/m2. It was observed that the main period of Chironomidae development on the Sedlice Reservoir is found in the interval between April to October with May as maximum. The presence of the other 3 groups of organisms, Branchiura, Trichoptera, and Coleoptera was discussed.