The Effect of Dam Construction on the Ostracoda (Crustacea) Assemblages in Kazandere Stream, Thracea, Turkey

Natural running water systems are important for ecological conditions of many organisms. Dams are built across a running water valley for multiple-purpose, therefore natural running water system is divided to three different habitats; stream, reservoir and spillway. In order to understand the effects of dam construction on the Ostracoda dispersion, ostracod fauna of three habitats, Kazandere stream and its branches that flow into the reservoir, newly formed Kazandere Reservoir and spillway were investigated and compared. Even though 17 species were determined from the streams, only two species from the reservoir and three species from the spillway were found

MORPHOLOGY OF DRY-RESISTANT EGGS IN PARTHENOGENETIC HETEROCYPRIS INCONGRUENS (RAMDOHR, 1808) (OSTRACODA, CRUSTACEA)

It has been known that many organisms evolved to survive in temporary or ephemeral inland waters. Many of them have dry-resistant eggs against desiccation. The structural feature of egg shell is important because only this will ensure to survive the dry period. Structural features of egg shell in the parthenogenetic Heterocypris incongruens (Ramdohr, 1808) was investigated by scanning electron microscope. Results showed that egg shell structure consists of two distinct layers; an outer layer with holes or alveoli and an inner layer consisting of two dense sublayers. Also, structural similarities in egg-shell of H. incongruens and some other crustaceans which combat desiccation problem will be discussed

THE MOLLUSK FAUNA OF ISTRANCA STREAM (TERKOS-ISTANBUL) AND SOME PHYSICO-CHEMICAL PARAMETERS OF THEIR ABUNDANCE

To identify the mollusk fauna of Istranca Stream, samples were collected seasonally from 18 stations from September 2011 to August 2012. The mollusk fauna of the stream consists of a total of 14 species, 11 of which belong to Gastropoda: Theodoxus (Theodoxus) fluviatilis (Linnaeus 1758), Bithynia tentaculata (Linnaeus 1758), Bithynia pesicii Gloer & Yildirim 2006, Bithynia pseudemmerica Schutt 1964, Valvata naticina Menke 1845, Valvata piscinalis (Muller 1774), Galba (Galba) truncatula (O F Muller 1774), Radix labiata (Rossmassler 1835), Physella acuta (Draparnaud 1805), Planorbis (Planorbis) planorbis (Linnaeus 1758), Oxyloma elegans (Risso 1826); three of which belong to Bivalvia: Pisidium casertanum (Poli 1791), Anodonta cygnea (Linnaeus 1758), Unio pictorum (Linnaeus 1758). Futhermore, water temperature (inverted perpendicular C), pH, nitrate nitrogen (NO3--N), nitrite nitrogen (NO2--N), and phosphate (PO4--P) of each sample were measured at the sampling sites. The relationships of species to environmental parameters were reviewed by CCA analysis. This research is the first study conducted on the Istranca stream to determine the mollusk fauna

DETERMINATION OF BENTHIC MACROINVERTEBRATE FAUNA OF ISTRANCA STREAM (DURUSU-ISTANBUL) WITH SOME PHYSICO-CHEMICAL VARIABLES

Benthic macroinvertebrate fauna of Istranca stream were investigated in 18 stations which belong to Istranca Stream by six times sampling from September 2011 to August 2012. 6066 individuals belonging to Bivalvia (5 taxa), Gastropoda (11 taxa), Malacostraca (1 taxon), Ephemeroptera (17 taxa), Odonata (11 taxa), Plecoptera (6 taxa), Hemiptera (9 taxa), Coleoptera (15 taxa), Megaloptera (2 taxa), Trichoptera (7 taxa) and Diptera (15 taxa) were determined. Dominancy (%) of Taxa according to specimen number were calculated. In terms of water quality, Criteria of Regulation on the Management of Surface Water Quality (2016) indicate that water quality constitutes to the Pt and 2nd water quality. The study is the first and detailed study is to determine benthic macroinvertebrate fauna on Istranca Stream