masoumeh darabpour dezdarani
Abstract
Abstract: mudflats of the most important coastal habitats of the Persian Gulf to go and base are essential primary production. Variety of animal species to determine the biological and ecological health of an ecosystem of water is important. Class of ostracoda component of hard skin is shelled. To study ...
Read More
Abstract: mudflats of the most important coastal habitats of the Persian Gulf to go and base are essential primary production. Variety of animal species to determine the biological and ecological health of an ecosystem of water is important. Class of ostracoda component of hard skin is shelled. To study the diversity and distribution of this species in the area seven stations were selected Bahrakan tidal beach. Sampling of sediment cores by the core 8/5cm2 from 5 cm surface sediments were performed. Environmental factors such as salinity, temperature, dissolved oxygen and turbidity was measured. Total organic carbon and grain size of total deposits each station respectively. Biological sediments at each station with 10% formalin were fixed, 63 mm sieve, then washed and stained with Rose Bengal and the organisms isolated were tetrachloride carbon. The density of organisms in the winter and summer were 10495 and 3565 individuals in the 10cm2, respectively. Finally, 29 species were identified. Cytheridae family was abundant. The highest value of Shannon’s diversity and brilluin index, Margalef index, Hill and Pielou’s evenness calculated in winter. The highest total organic carbon in winter and summer was 9.59 and 4.61, respectively. Sediment grain size showed that the region made of silt – clay and the highest percent of silt_ clay was in summer.
Rouhollah Zare; Seyyed Mohammad Bagher Nabavi; Mahdieh Eftekhar Vaghefi
Volume 12, Issue 1 , April 2013, , Pages 49-56
Abstract
Nest site location in reptiles is an important stage of their life cycle because environmental factors influence embryo survivorship, incubation quality and sex ratio. For studying effective factors on nest site location in the hawksbill turtle, we measured temperature, moisture, beach slope, particle ...
Read More
Nest site location in reptiles is an important stage of their life cycle because environmental factors influence embryo survivorship, incubation quality and sex ratio. For studying effective factors on nest site location in the hawksbill turtle, we measured temperature, moisture, beach slope, particle size of sand and vegetation related to 35 nests in Shidvar Island. In this Island, most nests were in northern beach which has a relatively steep slope. In this slope energy costs and probability of females and hatchlings predation is low. In addition hawksbills preferred to nest amongst vegetation. Of the environmental evaluated, slope appears to have the greatest influence on nest site location, because it is associated with nest elevation and hatching success is higher from nests closest to suitable elevation. It is believed that sea turtles may use multiple cues for nest site location and use a threshold that must be reached for each environmental factor before the turtle initiates nest excavation.