3 research outputs found
Descriptive Osteology of a Newly Described Stone Loach, Oxynoemacheilus chomanicus (Kamangar et al., 2014) (Cypriniformes, Nemacheilidae)
No full textOxynoemacheilus chomanicus is a newly described species of the family Nemacheilidae from the Choman River drainage of the Tigris basin. This study was conducted to provide the detailed osteological characteristics of this species and comparing them with those of other endemic species of the genus Oxynoemacheilus from inland water basins of Iran, namely, kiabii, O. persa, O. brandtii, O. kermanshahensis, and O. bergianus. For this purpose, nine specimens of O. chomanicus were collected, cleaned, and stained for osteological examination. Then, a detailed description of their skeletal structure was provided. The results showed that O. chomanicus can be distinguished from other studied species of the genus Oxynoemacheilus due to possessing an orbital shelf, number of the vertebrae, number of the hypurals, number of the unbranched rays in anal fin, features of the hemal and neural spines, and connection pattern of the parietal and frontal
Seasonal variations in abundance and diversity of copepods in Mond River estuary, Bushehr, Persian Gulf
No full textAbstract. Hedayati A, Pouladi M, Vazirizadeh A, QadermarziA, Mehdipour N. 2017. Seasonal variations in abundance and diversity of copepods in Mond River estuary, Bushehr, Persian Gulf. Biodiversitas 18: 447-452. The present study was carried out to investigate the abundance and biodiversity of copepods from Mond River (MR) estuary, Bushehr, Persian Gulf during 4 seasons and their relationships with environmental factors. The water samples were collected in mid-season from spring 2012 to winter 2013 for one year period. Copepod samples were collected by using of 140 µm plankton net with 25 cm mouth diameter and vertical towing in all stations. Copepod assemblages were comprised of 4 orders, 13 families and 10 genera. Orders were included; Calanoida, Cyclopoida, Poecilostomatoida, Harpacticoida and Genera were included: Cathocalanus, Acrocalanus, Paracalanus, Subeucalanus, Centropages, Temora, Calanopia, Labidocera, Pontella, Acartia, Oithona, Oncaea, Corycaeus, Microsetella, Microsetella and Euterpina. The order Calanoida with 10 genera was the most diverse and dominant order between Identified orders. The means (±SE) of copepods abundance were recorded in spring (5853.4±1826.19 Individual m-3), in summer (6707.6±1930.15 Ind. m-3), in fall (4393.6±1263.37 Ind. m-3) and in winter (3400±763.98 Ind. m-3), respectively. Simpson and Shannon-Wiener biodiversity indices were obtained in spring (0.87±0.11 and 2.86±0.19), in summer (0.89±0.006 and 3.11±0.15), in fall (0.86±0.13 and 2.66±0.2) and in winter (0.83±0.12 and 2.39±0.15), respectively. The copepod assemblages had most amounts of diversity and abundance at station 5 in all seasons. Pearson correlation showed significant correlation between copepod diversity and abundance with salinity, pH and temperature. Results showed that salinity factor was more effective environmental factor on Simpson (0.01> P and r=0.783) and Shannon-Weiner indices (0.01> P and r=0.727), and copepods abundance (0.01> P and r=0.664) in MR estuary.
Keywords: Abundance, copepod, diversity, environmental factor, Mond Estuary</jats:p
Comparison ability of algae and nanoparticles on nitrate and phosphate removal from aquaculture wastewater
No full textBackground: Aquaculture wastewater contains high levels of phosphate and nitrate. The reuse of this water
requires standards beyond the secondary standards to eliminate more organic pollutants from aquaculture
effluents. In this research, the removal of these pollutants from wastewater using Chlorella vulgaris and
Fe3O4 nanoparticles in the reactor space was investigated.
Methods: This study was conducted on fish farms effluent in the laboratory system. For this purpose, a 5-L
semi-industrial reactor with a mixer blade, porous plate, and a compressor was designed. Chlorella vulgaris
samples were collected from the natural environment and cultured in the laboratory environment. Also,
Fe3O4 nanoparticles were prepared from Iranian Nano Pishgaman Company to make the desired solution.
During the experiment (3 weeks), samples were taken weekly (in one phase) from the effluent. Dissolved
oxygen (DO), pH, nitrate (NO3), and phosphate (PO4) factors from the influent and effluent of the farms
were measured. The statistical data were analyzed using SPSS version 21 and Excel 2013.
Results: The amounts of nitrate and phosphate were decreased by about 80.76 and 80.55% in the biological
reactor, whereas these amounts were 70.52 and 70.48% in the nanoparticle reactor, respectively. Also, there
were significant differences in the amounts of NO3 and PO4 between the control treatment and weekly
treatment (P < 0.05).
Conclusion: Based on the results, both reactors were able to reduce nitrate and phosphate from aquaculture
wastewater, but the efficiency of the biological reactor was higher than that of the nanoparticle reactor.
Keywords: Nitrate, Phosphate, Fe3O4 nanoparticle, Chlorella vulgaris, Biological refinemen
