2024-03-29T21:02:22+04:30
http://joc.inio.ac.ir/browse.php?mag_id=44&slc_lang=fa&sid=1
44-1539
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Paleoecology of Neotethys Ocean Calcareous Nannofossils in Baghamshah Formation (Rizu Section)
azadeh
borbar
azadeh.bordbar1277@gmail.com
fatemeh
hadavi
hadavi231@yahoo.com
marziyeh
notghi-moghadam
m.n.moghaddam@gmail.com
abbas
ghadri
abbas.ghaderi@gmail.com
In this research, paleoecology of Baghmashah Formation in Rizu section based on calcareous nannoplanktons has been investigated. Baghmashah Formation is part of the Mago sedimentary mega sequence in the Tabas block that was located in the northern margin of the Neotethys Ocean in Jurassic-Cretaceous. The Baghmshah Formation in this section with 270m thickness mainly includes the alternation of green marl- shale with thin interlayers of calcareous sandstone. The study of calcareous nannofossils and index species of nannofossil indicates Berriasian- early Huterivian age for the Baghmashah Formation in this section. Investigation of the abundance of calcareous nannofossils in the studied section shows that the sedimentary basin of Baghmashah Formation in Rizu section located in low latitude with warm surface waters, and formation deposited in oligotrophic conditions with shallow environment
Paleoecology
Baghamshah
Rizu
Calcareous nannofossils
Neotethys Ocean
2020
10
01
1
8
http://joc.inio.ac.ir/article-1-1539-en.pdf
10.52547/joc.11.43.1
44-1421
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
The study of egg laying habitats and the success rate of green sea turtles (Chelonia mydas) nesting in the northern coast of Makoran (Sistan and Baluchestan province)
mahmood
sinaei
oceanography.sina@gmail.com
mohammad
talebi matin
hd_matin56@yahoo.com
mehdi
bolouki
lahijanjan@yahoo.com
mahtab
shojaei
shojaei@gmail.com
farhad
salehzehi
mahnazvojdanian@gmail.com
Given the importance of sea turtle nesting beaches on the coast of Sistan and Baluchistan province, this project with the purpose of research and conservation of spawning habitat was conducted in 2018. The coast by the executive team and locals were monitored.Examining the Sistan and Baluchistan province, about 300 km off the coast of northern makoran Sea indicates the existence of 13 important site sea turtle nesting area. A species that lay the egg during this project was green sea turtle (Chelonia mydas). The results of this study shows that the nest site selection success were 44.3%,63%,81.4% and 52.6% observed in Tang, Ramin, Lipar and Kacho, respectively. The results represent that highest nest site selection success was in Ramin. Results from the coast of the province of Sistan and Balochistan shows different morphology. The results of this study indicate that the maximum number of green turtle eggs (C.mydas) were observed in Ramin. The results show that the green sea turtle (C.mydas) habitats on the coast of Sistan and Baluchestan province are diverse and can be classified as sensitive areas of the coast, which is necessary for the implementation of conservation plans.
Green sea turtle
Oman Sea
Nesting
Chelonia mydas
2020
10
01
9
15
http://joc.inio.ac.ir/article-1-1421-en.pdf
10.52547/joc.11.43.9
44-1540
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
The Investigation of Microplastic Particles in Khor-e-Musa in Persian Gulf Sediments
Ahmadreza
Lahijan zadeh
lahijanzadeha@gmail.com
Maryam
Mohammadi roozbahani
Mmohammadiroozbahani@yahoo.com
Sima
Sabzalipour
shadi582@yahoo.com
MohammadBagher
Nabavi
M.nabavi@kmsu.ac.ir
One of the recently considered pollutants is microplastic particles. To investigate this contaminant, 15 samples of sediment were sampled from Khor-e-Musa estuary. Samples were transferred to the laboratory in thick plastic bags for extraction and counting of microplastic particles. H2O2 was first used to remove organic matter in the samples. Then, using the condensation separation method, the microplastic particles were separated from the sediment particles and finally identified and counted by using binocular optical microscopy. The average concentration of microplastic particles in the study area was 11.67 per 250 g of sediment and the maximum and minimum concentrations were 22 and 1, respectively. In this study, about 49% of the found microplastics were stringed, 36% multifaceted, and 14% spherical. The predominant color of these particles was white/transparent and black/gray, which accounted for 32% and 36% of the total microplastics, respectively. Also, about 13, 14, and 5 percent of the microplastics were yellow/orange, red/pink, and blue/green, respectively. In general, about 52, 33, 8, 3, and 3% of microplastics are related to microplastic particles with sizes less than 100, from 100 to 250, from 250 to 500, from 500 to 1000, and from 1000 to 1000, respectively. It was 5,000 micrometers. The results of this study showed that microplastic particles are present in the sediments of Khor Musa and most of these particles are filamentous and with dimensions of less than 100 micrometers. This means that the adsorption capacity of these particles is high for pollutants.
Microplastics
Sedimentation
Khor-e-Musa
Pollution
2020
10
01
17
25
http://joc.inio.ac.ir/article-1-1540-en.pdf
10.52547/joc.11.43.17
44-1569
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Marin Genetic Resources in Areas Beyond National Jurisdiction is a Subject in Intellectual Property Rights
kosar
Firouzpour
kosar.f1990@gmail.com
The discovery of marine genetic resources has led to increase of the number of international maritime patent claims .Given the unique characteristics of these organisms, the genetic resources derived from these organisms have great potential in the medical field and for research and development in the fields of antioxidants, fungal treatments, AIDS, cancer, tuberculosis, malaria And antibiotics are of particular value. Given that most marine genetic resources exist in areas beyond the national jurisdiction, so far, international law, including the Convention on Biological Diversity and the Convention on International Maritime Law, does not have the necessary and complete mechanism to regulate access and management of these resources. For this reason, the General Assembly, by issuing Resolution 292/69 in 2015, acknowledged the need for a new international agreement in accordance with the Convention on the law of the Sea in the field of conservation and sustainable use of biodiversity. In this paper, while examining the position of marine genetic resources in the international law system, we pay attention to the traditional knowledge and rights of indigenous peoples while exploiting genetic resources and the patent system and consider new international law innovations to resolve existing conflicts.
Keywords: Genetic resources
Areas beyond national jurisdiction
Intellectual property rights
Traditional knowledge
Indigenous people rights
2020
10
01
27
40
http://joc.inio.ac.ir/article-1-1569-en.pdf
10.52547/joc.11.43.27
44-1553
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Past, present and future state of the carbonate system and acidification in Hengam coral reef in the Persian Gulf
Abolfazl
Saleh
saleh@inio.ac.ir
Assuming the possible scenario ICCP RCP8.5, by 2100, the pH of seawater in Hengam coral reef in the Persian Gulf will decrease by 0.46 compared to 1880 (to less than 7.72). Total dissolved inorganic carbon will increase from 2006 to 2263 µmol/kg. The concentration of bicarbonate ions will increase by 24% and the carbonate ions will decrease by 51%. The saturation of calcium carbonate in seawater will be reduced by more than 50 percent, possibly leading to a 38 percent decrease in the calcification rate of Hengam Island corals compared to pre-industrial. Given that the rate of erosion and calcification in the corals of the Persian Gulf is somewhat close, at the end of the century, with the decrease in the rate of calcification and increasing the rate of erosion of corals, an unfortunate outcome awaits the corals of the Persian Gulf.
Carbonate chemistry
acidification
coral reef
Persian Gulf
2020
10
01
41
49
http://joc.inio.ac.ir/article-1-1553-en.pdf
10.52547/joc.11.43.41
44-1464
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Exploring Effects of Stunning with Electroshock and Asphyxia in the Air Methods on Color and Sensory Characteristics of Cultured Silver Carp (Hypophthalmichthys molitrix) During Storage in Ice.
Mohammad
Khosravizadeh
mohamad.27kh@gmail.com
Ainaz
Khodanazary
khodanazary@yahoo.com
Vahid
Zarei
vahid_zareii@yahoo.com
Color and sensory characteristics have a key effect on consumer's preferences of fish product. Hence, the aim of present study was to explore the effects of two stunning/slaughtering methods including electroshock and asphyxia in the air on color and sensory characteristics of cultured silver carp. The results showed all color indices changed significantly across both treatments at the end of study (p<0.05). However, comparing the results indicated only redness (a*) and yellowness (b*) indices showed significant differences between both methods. a* and b* indices were significantly higher in electroshock and asphyxia methods, respectively. Also, the results showed significant increase (P<0.05) in the quality index of fish during the storage time and their scores reached to 10 and 9.3, respectively. However, the results of quality indices indicated lower speed rate of changes in sensory characteristics in electroshock methods during storage time.
Silver carp
Stunning methods
Electroshock
Asphyxia in the air
2020
10
01
51
60
http://joc.inio.ac.ir/article-1-1464-en.pdf
10.52547/joc.11.43.51
44-1576
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Detection of the effects of thermal anomalies caused by large-scale atmospheric-oceanic signals on the bleaching events of the Persian Gulf coral reefs
Amir
Gandomkar
xazhdari@gmail.com
Amir
Azhdari
Azh.khatereh@yahoo.com
Keyvan
Kabiri
kabiri@inio.ac.ir
Atmospheric ocean linkage signals are one of the most important drivers of climate anomalies. These cycles around climate linkage can play a key role in the whitening and death of coral colonies by altering the temperature characteristics of the water surface of each region. The main purpose of this study is to evaluate the effect of large-scale oceanic signal signals on the bleaching episodes of Persian Gulf coral reefs. In this regard, data related to 35 indicators of climate linkage cycle during the statistical period 1980-2015 (36-year period) were obtained from the Climate Prediction Center of the United States Oceanic Atmosphere Base (NOAA). The whitening episodes of the Gulf of Persia were also extracted from the Global Coral Monitoring Base. The results of correlation analysis showed that among the 35 major oceanic atmospheric linkage indices influencing the Earth's climate, two Atlantic multi-decade oscillation (AMO) and the equatorial Pacific water temperature change index in the NINO3.4 region, With sea surface temperature anomalies in the Persian Gulf region, it has provided a significant correlation at the level of confidence of 0.95. The apparent correlation of water surface temperature in the Gulf of Persia region during the warm season months (June to September), when there was the highest risk of water whitening, indicated that two indicators, AMO and NINO3.4, were able to justify the significance of bleaching episodes. The results of the analysis of the frequency of bleaching events in the Persian Gulf corals indicated that all recorded events were related to the positive phase of AMO. In the case of the NINO3.4 index, a similar result was obtained that the positive phase of this bonding pattern caused high risk temperatures in the Persian Gulf and caused general bleaching events in the coral reefs of this region, so that out of 12 occurrences in the region, 7 cases This index has been recorded in the positive phase and only 3 cases have been in the negative phase. Knowing that these two linkage patterns are among the 35 main climate control linkage patterns, they are the main drivers of coral bleaching and mortality in the Persian Gulf, so with careful knowledge and monitoring of these linkage patterns, protection measures can be taken to a large extent. For coral colonies in the region performed more efficiently.
coral reefs
Teleconnection
Sea Surface Temperature
Persian Gulf
2020
10
01
61
70
http://joc.inio.ac.ir/article-1-1576-en.pdf
10.52547/joc.11.43.61
44-1609
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Performance based assessment of offshore wind turbine platform using the constrained new wave method
Ali
Jafari
jafari_nasir@yahoo.com
Reza
Dezvareh
rdezvareh@nit.ac.ir
The purpose of this study is to provide a more accurate and practical method than static and spectral methods to assess the offshore wind turbines that are loaded with both wave and wind time history, the structure is evaluated by increasing the load intensity in successive steps to the stage of failure and the performance of the platform in different wave patterns are investigated. In this study, incremental wave-wind analysis is used, which is similar to the IDA method in earthquakes. In conclusion, it is observed that the responses of the structure under different loads of waves will be so similar. Short-term irregular waves in this study are called constrained new waves, which is a very good alternative to irregular waves with a long time history, jointed wave-wind data are used, all modeling and interaction relations between the wave and the structure and Wind power is done with open-source software.
Offshore wind turbine
Performance based assessment
constrained new wave
dynamic analysis
2020
10
01
71
80
http://joc.inio.ac.ir/article-1-1609-en.pdf
44-1602
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Comparison of surface salinity of Persian Gulf water using field data and FVCOM numerical model
maryam
dabestani
dabestani.au@gmail.com
Mahdi
MOHAMMAD MAHDIZADEH
mehdizadeh@hormozgan.ac.ir
Jafar
Azizpour
azizpour@inio.ac.ir
This paper investigates and estimates the surface salinity changes of the Persian Gulf using the FVCOM numerical model. Sea level salinity (SSS) is one of the important parameters in oceanographic studies. The Persian Gulf is a semi-closed and shallow sea, which is high in the Persian Gulf due to its low rainfall, salinity and water density. One of the limitations of this region is the lack of field data related to the surface salinity of seawater. The main purpose of this study is to investigate the surface salinity of water using the FVCOM numerical model, which has been studied at a depth of 1 meter from the surface. In this model, wind, tidal, heat flux, temperature and salinity data have been applied in the model. First, for 5 years (2005-2009), the model was implemented and the results obtained by the model were compared with field observations in the Persian Gulf, which have a very good agreement.
Surface water salinity
FVCOM numerical model
Persian Gulf
2020
10
01
81
87
http://joc.inio.ac.ir/article-1-1602-en.pdf
44-1499
2024-03-29
10.1002
Journal of Oceanography
1562-1057
2476-6755
doi
2020
11
43
Study of Late Quaternary temperature variations using stable isotopes in the southeastern part of the Caspian Sea
Hossein
Bagheri
hosseinbagheri@inio.ac.ir
In the present study depositional temperature and consequently major climatic changes are investigated in the Southeastern part of the Caspian Sea using oxygen and carbon stable isotopes. For this purpose, two sediment cores (K, N1) with lengths of 170 and 712 cm were collected from eastern and southern parts of Gorgan Bay. The paleotemperature was obtained based on mass spectrometry analysis of sediment samples. The range of oxygen (δ18O)and carbon isotope (δ13C) in the K1 core varied between 4.04-1.90‰(mean 3.26 ‰) and -2.66 ‰ to -1.73 (mean 2.21‰) respectively. Whereas, in N1 core fluctuation of δ18O , δ13C was between -4.22 to -1.17‰ and 2.66 to-0.94‰with a mean of 3.34 and -2.11 ‰ correspondingly. Based on the results of 14C age and stable isotopes 15 centigrade changes in temperature have occurred during about 22,000 years, Accordingly, 8 warm and cold periods were identified, which the coldest period being the last glacial maximum (Wurm) with a temperature of 13.7°C. Furthermore the highest temperatures related to the pre-glacial and the present periods (about 27- 27.4 ° C). Moreover the sedimentology and magnetic susceptibility data confirmed the above results.
Caspian Sea
Core
Stable Isotopes
Paleoclimate
2020
10
01
89
105
http://joc.inio.ac.ir/article-1-1499-en.pdf