جستجوی مقالات مرتبط با کلیدواژه "لارو" در نشریات گروه "زیست شناسی"

Argas reflexus or pigeon tick is a soft tick of Argas genus. This tick is an external parasite of poultry that often feeds on pigeon blood and is one of the most important pigeon ectoparasites that can endanger human health. The aim of this study was to investigate the physiological and behavioral effects of feeding Argas reflexus larvae on mice.

After collecting the Argas reflexus ticks and in vitro production of their larvae, mice were infected with 30, 40 and 50 larvae in three treatments, respectively, and 5 mice were treated in each treatment. Then, Physiological symptoms such as changes in weight and temperature, behavioral changes and skin symptoms were monitored and recorded daily.

The results of this study show with increasing the number of larvae in infected mice, the severity of symptoms also increase. It also seems that in addition to the number of larvae, the longer feeding of larvae from the body of laboratory animals, the greater the severity of clinical and cutaneous symptoms and their stability.

According to the results, it is necessary to pay attention to the dangers of the presence of this tick in birds as the main host of this tick and also in the habitat of humans and to develop control and preventive programs against this tick.

Macrobenthos community like other animals are affected by their peripheral environment and their diversity is dependent on their sensitivity to the environmental factors. The aim of this study was to investigate the impacts of some environmental factors on abundance and biodiversity of macrobenthos community in Karaj River. Samples were taken from 10 stations in two seasons and 11 environmental factors were measured. A total number of 8032 macrobenthos belonging to 10 orders and 38 families were identified. Baetidae and Chironimidae were the most abundant in autumn and spring, respectively and changes in altitude (2 seasons) and temperature (autumn) and depth (spring) were the most driving factors in determining pattern of abundance and combination of species. Biodiversity pattern and seasonal changes in the variety of benthic invertebrates in the Karaj River were also determined by the abovementioned environmental factors. Altitude, temperature and depth had effects on the habitat which was further responsible for changes in biodiversity, abundance, species’ structure and combination.

In this study we examined biology of booh that eat leaft of elm with termed Xanthogaleruca lateola coleoptera, chrgsome lidae and also we studied method of control of that. It is perform in garmsar town ship. For this purpose carry out necessary sampling of several ages in period of this growth. Within condition of laboratory collected/ eaf branch possess category egg and piece. During test nursery dampen leaf is secure of spray of wateron them and put egg in anvcobator with temperature 24+2 and dampen 60+ and during period of light 15 hour, we examine state during period of germinal carry out and size depended to medicine in cludde length of medicine and width of capsule egg and etc. according to the result, width of capsule egy end etc. according to the result, winter sample and pass 15 day after farvardin(first month of the persion solar year) with temperature almost 17 thermometer centigrade appearance and begin lay and produce medicine. Then to end of sharivar(6 th month of the Persian solar year) leave 3 whole bungle. Egg observed form of category 4-1 row and in each row eggs was 1-40 between row. During period was 8 days. This pest had 3 ages on during period last almost 27/2 days Pre prers. Chrusalis and chrysalis state depending on breed of bungle that last 9-11/3 days and time of exist of mature insect last between 25-27/2 days. More of loss was depend to period of medicine this was 1-2 days. But mechanic and biology control method and at least chemical method was using lack zolon and tiodan that yet common control method for this pest.

Feasibility of using geometric morphometrics on larvae of Loristan newt for population identifications Lorestan newt (Neurergus kaiseri, Schmidt 1952) is one of the native amphibians inhabiting streams, springs and waterfalls in the mountain regions of south and southwestern Iran. The current study was conducted, for the first time, to investigate the feasibility of using geometric morphometrics on larvae to distinguish the populations of this species. Image processing for morphometric analyses was performed on 112 larvae collected from eight sites. Two-dimensional land marking was used and 19 landmarks were selected for digitization. Morphometric data were then overlaid and analyzed using multivariate statistical methods (PCA and CVA). Results showed morphological differences between larvae of the studied populations and two morphological clusters can be distinguished within the populations. Therefore, due to differences between these populations and the difficulty of distinguishing these larvae based on the color patterns, it is recommended to be more cautious about releasing larvae to the wild.

Evaluation of probiotic is not summarized on growth but included the other aspects, such as blood parameters. In this study, effects of two bifidobacter, Bifidobacterium animalis and Bifidobacterium lactis with three concentrations of 1× 109 (T1), 2× 109 (T2) and 3× 109 (T2) CFU/100g were studied on growth performance and hematological parameters of rainbow trout larvae with initial body weight of 0.538 ± 0.197 g. Thus 3 experimental treatments and a control, each with three replicates were prepared. Thirty rainbow trout larvae were stocked in each replicate. The larvae were fed 4 times a day according to 4-8% of body weight. After 8 weeks of feeding trail with supplemented diet with Bifidobacterium growth and hematological parameters were studied. The result of hemoglobin showed no significant difference between experimental treatments and the control (P>0.05). The use of Bifidobacter caused increase of red and white blood cells in T3 and T2 treatments (P<0.05). However no significant difference was observed in MCV and MCH (P>0.05). The study of hematological parameters, final weight and specific growth rate in present study showed that the use of bifidobacter increased blood cell account and also the final weight growth in rainbow trout.

Present survey was performed for diagnosis of frequency of contracaecum sp. larval stage on Parishan lake. Fish capturing was done in both warm seasons (spring and summer) and cold seasons (autumn and winter) of year and captured fish was transferred to parasitology laboratory of veterinary medicine faculty of Islamic Azad University, Kazerun Branch. Totally, One hundred and seventy fish was examined including five species: Barbus luteas,Capoeta barroisi persica,Garra ruffa obtusa, Chalcalburnus sellal and Cyprinion macrostomus tenairidias. The result showed that the mean of infection in Barbus luteas was 63.11 and 2 0.91, in Capoeta barroisi persicawas 3.28.666 and 1.5 5.44, in Garra ruffa obtuswas 6.833 3.368 and 2 0.732, in Chalcolburnus sellallwas 9.52.724 and 2 0.733, in Cyprinion macrostomus tenairidiaswas 52.301 and 2.5 1.08 in hot and cold seasons respectively. Also the highest and lowest number of parasites among fish species realated Chalcalburnus sellal andGarra ruffa obtusa. Parasite frequency in all over of warm seasons was more than cold seasons.

Persian salamander Paradactylodon gorganensis is endemic, unique and valuable genetic pool of Iranian Amphibians that exists in forests of Golestsn province. In this research, for the investigation of biological aspects of this species, for the first time natural habitats include Odaneh, Req and Gorgloo springs have been recognized in forested area of Ziarat village in south of Gorgan in 1250-1600m elevation above the sea level. We studied these localities 12 times from August 2009 to September 2010. Also, geographical position, climate, substrate, fauna, flora were investigated. In every time characters of larvae were studied. Results, shows that larvae are active at all time of the year, even when the habitat covered with snow and air temperature is -3°C. The larvae were seen with different sizes and ages in a same time, Therefore, it seems that they don’t transform during the first year. There was cannibalism relationship in larvae. Also some of larvae may be eaten by crabs (Potamon sp). Although larvae have 4 fingers and toes in the limbs but some specimens were seen without, 3 and 5 fingers and toes. It seems that the air and water temperature do not have serious effect on growth and metamorphosis in larvae. Habitat destruction by farmers and animals, pH changes, water shortage are the most important and threating factors for population of this endemic species that live in specific habitats with limited distribution.