Investigation of the possible effect of Pike (Esox lucius) on the invasive fishes of the Persian Gulf Martyrs Lake, Tehran (original) (raw)
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Biodiversity and Geographical Distribution of the Ticks in Ahvaz, Southwest of Iran, 2018
Journal of Health Research, 2019
Introduction and purpose: Ticks as biological vectors and reservoirs of diseases, such as Crimean-Congo hemorrhagic fever (CCHF), have an important role in the transmission of pathogens to humans and animals. In this regard, this study aimed to determine the biodiversity indices, distribution, and fauna of the vectors of CCHF in Ahvaz, Iran. Methods: The tick samples were collected and identified from the head, ear, groin, under the tail, and around the rectum of cattle, sheep, and goats in spring and autumn. Biodiversity indices were calculated based on the host type. Moreover, the frequency map of the ticks was drawn using ArcGIS software (version 10.4). Results: A total of 287 livestock were examined in this descriptive cross-sectional study. Overall, five species of tick were identified from three genera. Frequency rates of Hyalomma marginatum, Hyalomma anatolicum, Rhipicephalus bursa, Rhipicephalus sanguineus, and Boophilus annulatus were calculated as 21.25%, 2.5%, 61.25%, 11.25%, and 3.75%, respectively. According to the Shannon-Weiner index, the species diversity of the goat host was less than that of the hosts of cow and sheep. In addition, based on the Simpson index, the diversity of dominant species in the goat host was less than that of the other two hosts. Furthermore, the species richness index in sheep host was the highest among the hosts. However, the evenness index of the species based on the host type was calculated to be the highest equal to 0.789 for the host of the cow. Conclusion: According to the obtained results, there was a relation between biodiversity indices and tick-borne diseases. The aforementioned relationship provides useful information in terms of preventing diseases transmitted by ticks.
2021
Determination of population dynamics is the important indicator for evaluating of status and management of commercial species. In this research, trend catch and demographic characteristics and demographic characteristics of Bigeye tuna (T. obesus) were estimated by collecting information from 4 catchment areas on the coast of Sistan and Baluchestan Province including Brace, Ramin, Pozem and Konarak. In this project, more than 800 fish at the research stations were biometric and the growth parameters were L∞ = 113 cm, growth factor K = 0.45 (yr-1), natural mortality M= 0.71(yr-1), mortality and mortality (yr-1), F = 0.15, total mortality (yr-1), Z = 0.86 and exploitation coefficient (yr-1), E = 0.18, and the time zero was -0.25 for the years. Relative production per recruitment, relative biomass per recruitment, exploitation rate and average annual standing stock for kawakawa species were estimated Y '/ Rp =0.02, B' / Rp = 0.70, U= 0.10, respectively. This study shows that an...
Iranian Journal of Ichthyology, 2020
This study was conducted to determine the reproductive biology of Nematalosa nasus for a period of 18 months from September 2016 to April 2018 in the coastal waters of the Persian Gulf. In total, 618 specimens (331 males and 287 females) were collected as bycatch in the shrimp bottom trawl net. Fork length ranges from 95-160 mm (mean 135±0.7mm) and 95 to 169mm (mean 139±0.8mm) in males and females, respectively. The overall sex ratio showed that the males were dominating (1.15:1). Also, the size-specific sex ratio showed that the number of males was more dominant in fork length classes less than 135mm, and females generally dominated at lengths greater than 150 mm. Monthly variations in the Gonad Somatic Index (GSI) and morphological maturity stages of ovary indicated that Bloch's gizzard shad had a long spawning season with two distinct peaks in autumn and winter (from September to February). The smallest females mature Bloch's gizzard shad were found in the size classes 12...
Nova Biologica Reperta, 2021
Coccidian (Apicomplexa: Coccidia) parasites have been reported in almost all groups of vertebrates. These parasites may cause serious ecological and pathological effects to their hosts. Reptiles were found the be the host of the parasites of the genera Schellackia and Lankesterella, as these parasites undergo their entire life cycle in the reptilian body, with an intermediate stage of dormancy in the tissues of a hematophagus transmitter (generally a mite or a mosquito), until the next reptilian host swallows the infected insect. However, very little is known about the prevalence and intensity of these parasites in most of their distribution area, which is the focus of the current study. To do so, the prevalence and intensity of these blood parasites in three species of lizards, including Ophisops elegans, Trapelus lessonae and Eremias monticola from Markazi Province of Iran were investigated. Samples of blood were collected from the caudal vein of 51 lizards of the aforementioned s...
2021
Birjand city Qanat Morphological characteristics Sex ratio Model Introduction: The goal of this study was to investigate in Gammarus parthicus, body length frequency distribution (male, female) and relationship between clutch size and different body parts (head, pereon, pleon). Materials & Methods: Sampling from a Qanat in 2019 was done in Birjand city (Spring, Summer, Autumn and Winter). Totally, 252 gammaruses were catched. In each sampling, one hour was attempted to catch gammaruses by a hand sieve with one mm mesh size. To measure, a stereo microscope and millimeter paper were used and the samples were photographed. With a petri dish and the plastic talc (placed over the samples) gammaruses were photographed lively. Length was measured from the beginning of the head (Rostrum) to the end of tail (Telson). In addition, head, back and tail length were measured separately. Image-J software was used to analyze the resulted images. Result: The mean total length of males and females gammaruses in four seasons were (Mean± SE) (15.75±1.21) and (12.93±1.43) respectively. Sex ratios differed according to the seasons. The total body length was obtained as a model of the explanatory variables including head length, tail length and season. The most sex ration in spring (1.39) and the lowest one in winter (0.31) were observed respectively. The total body length was obtained as a model of the explanatory variables including head length, tail length and season. The number of eggs (clutch size) per fertilized female was obtained by tearing the bag of eggs. The number of eggs was counted in a sample of gammaruses after 10 days keeping in the climate room. The climate room was used to simulate the reproduction conditions. The number of eggs was obtained as a model of head length and tail length. Conclusion: The report of Gammarus in the east of Iran and the influence of season in life cycle of the Gammarus.
جایگاه حفاظتی گونه انحصاری مورخوش Zhumeria majdae در ایران
2020
Zhumeria majdae is the only species of the genus Zhumeria of Lamiaceae family. This bushy species is endemic of Iran (Hormozgan province) and is distributed on very steep slopes of mountains at 525-1430 meters a.s.l. Based on IUCN guidelines, different criteria were used to evaluate the status of this species as follows: extent of occurrence (EOO), area of occupancy (AOO), size of population, regeneration, and quality of habitat. According to field studies, Zhumeria majdae occupies an area of 0.11 km 2. According to an analysis by GeoCAT software, the extent of occurrence was 7977 km 2. Based on our results, Zhumeria majdae is defined as a Critically Endangered (CR) species. The monotypic genera contain the species that, if threatened, may disappear forever and their associated genomes will not be found elsewhere in the world. It is highly recommended that appropriate approaches should be taken to prevent the extinction of this species.
2014
Remiz pendulinus complex species belonging to penduline tits or family Remizidae (Aves: passeriformes). There is incongruity about the taxonomy of the bird and extent of distribution of populations in Iran is unclear. Distribution range of R. pendulinus complex species populations in the two-year (winter 2012 to winter 2014) surveyed and distribution map of breeding and wintering sites in 19 provinces using GIS was developed. Two subspecies of R. p. menzbieri and R. p. neglectus are resident in West [and the North-West] and North (Mazandaran) regions, respectively. Subspecies R. p. coronatus is scattered as wintering in North-West of Iran. Subspecies R. p. nigricans in Sistan basin didn't observe. Azerbaijan-e-Gharbi, Azerbaijan-e-Sharghi, Ardebil, Zanjan, Qazvin, Kurdistan, Kermanshah, Markazi, Gilan, Mazandaran and Golestan provinces were determined as breeding sites and Khorasan-e-Shomali, Khorasan-e-Razavi, Khorasan-e-Jonubi, Isfahan, Charmahal-va-Bakhtiari, Lorestan, Khuzes...