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    Preliminary study of fish community structure in Amanos Mountain streams (Hatay-Turkey)
    (Springer, 2008) Okur, Emel; Yalcin-Oezdilek, Suekran
    Fish diversity and distributions in 33 streams of the Amanos Mountains were investigated between December 2002 and November 2003. Some physical and chemical parameters, such as water temperature, dissolved oxygen, electrical conductivity, pH, and velocity of the streams were measured periodically at each site. The study area was grouped into three regions: AS (Asi Basin), IS (Iskenderun Gulf) and CE (Cevlik region). Fish abundance and Shannon Diversity Index were computed for each region. CE region was the poorest compared to the others in terms of fish abundance and diversity. A total of nine species in four families (Cyprinidae, Balitoridae, Anguillidae, Blenniidae) were recorded and all species collected were found to be indigenous. Capoeta barroisi (42.2%) and Garra rufa (33.3%) were the most common and abundant species and Salaria fluviatilis (0.4%), Carasobarbus luteus (0.9%), Anguilla anguilla (1.0%) and Alburnus sellal (1.2%) were the most rarely encountered species in the Amanos Mts. The endangered species Alburnus orontis is also rarely found. Fish diversity was greater in perennial streams (0.62) than in intermittent streams (0.27). There are many adverse human impacts on fish fauna in the Amanos Mountain streams; however, numbers of intermittent streams impose the greatest threat to fish in the Amanos Mts.
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    Öğe
    The effects of some elements (Ca, Mg and Cr) on the nesting activity of green turtles on the Samandag Beach, Turkey
    (Parlar Scientific Publications (P S P), 2006) Yalcin-Oezdilek, Suekran; Oezdilek, Hasan Goeksel; Sanguen, M. Kemal
    Samandag Beach is one of the most important nesting habitats of Chelonia mydas (L., 1758), one of the endangered species in the globe. In this study, calcium (Ca), magnesium (Mg) and chromium (Cr) in 135 sand samples collected from the nesting habitat (Samandag) of C. mydas species are examined. Sampling was carried out from three types of sites: (1) adjacent to nest chambers, (2) the adults' tracks, and (3) non-track (one random point from every 2 km) locations. The samples were obtained from three levels at each sampling point; surface (upper layer), medium (30 cm deep) and deep (80 cm) vertically. Some biological data about nesting, activity, such as nest density and nesting success, were also monitored in 2003 nesting season. The mean concentrations of Ca, Me, and Cr in sand are 278 ppm (mg kg(-1)) (+/- 121.97), 317 ppm (+/- 9.92), and 5.40 ppm (+/- 1.38), respectively. Ca and Mg in sand have a significantly positive correlation with nesting success (r = 0.717 for Ca; r = 0.672 for Mg; both p<0.001). Moreover, Cr has a positive correlation (r = 0.760; p<0.001) with nest density. The results indicate that both Ca and Cr concentrations on sand beaches used by green turtles to nest play important roles in their nesting success.