جستجوی مقالات مرتبط با کلیدواژه « قشم » در نشریات گروه « زیست شناسی »

The aim of this study was to examine the accumulation of lead, nickel, and cadmium heavy metals in the muscle tissue of Peronia peronii in the waters of Bandar Lange and Qeshm in April. Thirty samples were separately collected from each station and subjected to drying and acid digestion before measurement using a flame atomic absorption device (GBC model F savant). The results revealed varying levels of metal accumulation, with the highest and lowest concentrations recorded as 0.112 and 0.024 micrograms per gram for nickel and cadmium, respectively, in Langeh and Qeshm ports. Additionally, a significant relationship between the concentration of nickel, lead, and cadmium and the average total weight of P. peronii was observed, indicating a positive correlation with the total weight (p<0.05). However, no significant relationship was found between the accumulation of these metals and the average total length of P. peronii in Bandar Lange and Qeshm Island, indicating a lack of correlation with the total length of the flounder seaweed (p>0.05).

The present study investigated phylogeny of Iranian (the Persian Gulf and Oman Sea) humpback dolphin, using mitochondrial D-LOOP gene. As a result, four sequences of D-LOOP were obtained from the four Iranian specimens and were compared with available sequences of the members of the genus Sousa from the GeneBank (NCBI). For phylogenetic analyses we used two methods, Maximum Likelihood and Bayesian Inference. In the analyses of D-LOOP, all Iranian sequences group firmly together with Indian specimen under a supported clade (bootstrap value = 98 in ML tree, posterior probability = 1 in BI tree). The Indo-Iranian clade clustered firmly with the clade of Sousa plumbea from west of Indian Ocean and South Africa. This finding proof that the Iranian humpback dolphin does not belong to S. chinensis, as previously were recorded, but belongs to S. plumbea. To address the phylogeny with better resolution, careful morphological examination along with using more mitochondrial and nuclear markers are suggested.

Echinoderms are among the most abundant benthos possessing various economic, ecological and nutritional importance.

Studying and investigating the biodiversity and spatial distribution of echinoderms in the rocky shores of Qeshm.

Biodiversity and distribution of Echinoderms in eight stations (Toola 1, Toola 2, Aftab, Dafari, Tango, Havafaza, Biotechnology, and Naz Island) and three intertidal zones (high, middle and low) on the rocky shores of Qeshm island in summer and winter seasons (August and January 2018) were investigated. At each station, one to two transects oriented perpendicular to shore were determined. Echinoderms were counted with 3 replications in each station and inertidal zones.

Results:

 In this study, 12 echinoderms from 9 families were identified. The maximum and minimum frequency  were observed in winter with an average of 17 ind/m2</sup> in the mid tide zone of the Havafaza station and in the summer with an average of 1 ind/ m2</sup> in the low tide zone of the Naz Island station, respectively. Ophiocoma scolopendrinae was the dominant species (21.39%) in all stations. The results of the three-way permutational multivariate analysis of variance (PERMANOVA) showed that the  community structure of echinoderms is different in the different stations and sampling seasons. The highest and lowest Shannon index, Margalef index and Pielou index were compared among sampling stations and different seasons. According to the results of Simper test,Ophiocoma scolopendrina, Astropecten hemprici, Holothuria leocospilota Holothuria scabra, Astropecten phragmorous, Diadema setosum accounted for the highest percentage of participation in Bray-Curtis dissimilarity in terms of species density, between summer and winter seasons and in different sampling stations.

Conclusion:

 The population structure of Echinoderms in the studied stations is influenced by various factors such as seasonal changes, tourists and residential areas.

Plankton survey in coastal area of Southern Waters Qeshm was carried out in two season cold and warm and four stations (Parke Zeyton Beach, Soza Beach, Shibdraz Beach and Salakh Beach) during 2015 and 2016. In this study phytoplankton species belonging to 4 order Bacillariophyceae (Diatoms),Dinophyceae (Dinofellagelates), Chlorophyceae and Cyanophceae (blue-green algae) were identified. phytoplankton identification was done until genus and 31 ditoms, 11 from dinofllagelates, 6 from Chlorophyceae and 4 genus from cyanophyceae were identified.The mean (± SE) of density, biodiversity indices of Simpson,Pielo Shannon and Margalef were respectively 6705.72±63.9 Cell/L, 0.82±0.34,1.12±0.17 , 1.9±0.19, and 2.61±0.38 in season warm and 5666.13±53.2 Cell/L, 0.77±0.06, 1.12±0.11 , 1.9±0.17 and 2.26±0.43 in season cold.The seasonal similarity based on Sorensen's and Jaccard's coefficients were highest (0.97 and 0.88) for - two season warm and cold. In addition, there were significant correlation between Simpson and Shannon-Weiner diversity with salinity and PO4, and phytoplankton density with salinity and pH. A ccording to the results obtained can be concluded that both the area of ecological conditions in ranks are instead moderate. Also, phytoplankton of diversity and richness is good.

The genealogy of songbirds has long been considered. In the present study, the cytb mitochondrial marker was used in one of the southernmost regions of its distribution in Iran to identify the lesser whitethroat subspecies (Sylvia curruca). Comparing the sequences obtained from the Qeshm Island specimens with the Gene Bank, it was found that this array in southern Iran is considered as halimodendri, which ultimately reflects the cladistic status of the lesser whitethroats of Qeshm Island in southern Hormozgan as a study area not established in Iran. Also, with a systematic molecular approach and using genealogical analysis, it was found that this subspecies had two distinct groups and haplotypes with the highest value relative to the index taxa of this species (i.e. curruca). The Qeshm Island specimens were divided into two clades due to genetic distance and phylogenic trees. The results of the study also indicated that these two clades formed in Qeshm Island had major differences, which could be linked to the separation of migration routes and breeding areas in the northern habitats.

So far, many studies have been done on the classification and ecology of mollusks in the Persian Gulf and Oman Sea. Identification and classification of the lower abdomen along with corals on Qeshm Island. Sampling was performed in two different stations on Qeshm Island in the summer of 2018. Finally, 17 families, 25 genera and 32 species were identified on Qeshm Island, which are as follows. Euchelus asper, Umbonium vestiarium, Lunella coronata, Nerita albicilla, Nerita textilis, Planaxis sulcatus, Cerithium caeruleum, Clypeomorus bifasciatus bifasciatus, Clypeomorus bifasciatus persicus, Rhinoclavis(Rhinoclavis)sinensis, Strombus(conomurex)persicus, Cypraea turdus winckworthi, Polinices mammilla, Cymatium(Monoplex)aquatile, Bursa(Bufonariella)granularis, Pyramidelloides angusta, Cronia cf konkanensis, Morula granulata, Thais savignyi, Thais sp, Anachis misera, Euplica varians, Mitrella blanda, Nassarius sp, Nassarius(Niotha) jactabundus, Nassarius(plicarcularia)fissilabris, Nassarius(plicarcularia)persicus, Nassarius(zeuxis)frederici, Bullia(Bullia)tranquebarica, Oliva bulbosa, Terebra nassoides,Tropaeas brunneomaculata The largest family in terms of species diversity was the Nassarridae family. The largest species in terms of size was Cymatium(Monoplex)aquatile 45mm and the smallest sample was Mitrella blanda5mm. In terms of frequency, Cerithium caeruleum species are the most abundant.

High population pressure in coastal areas has led to loss in many mangrove areas. Although these areas are fish nursery grounds, but there are no accurate and up-to-date data available. In this research, the catch data in the Qeshm Island marine protected area (MPA) were investigated using 11 stake nets. Totally, 81 specimens belong to 60 genera and 63 families caught, which majority of them were discards. The commercial fish were young, andin almost all commercial fishes, the whole catches were smaller than LM50. Moreover, in case of butterfish, only 15.3% of the caught individuals were in the legal catch size. Hence, this catch composition would be a potential threat to fish stocks. The major numeric and weight based specimens were Dussumieria acuta (10.05%) and Arius maculatus (5.9%), respectively. In addition, the Clupeidae containing seven species was the most abundant family in the catch composition. Moreover, the majority of catches were occurred in the late winter to early spring and late summer to mid or late fall.