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Showing 3 results for Morphometric Character
Volume 5, Issue 3 (9-2017)
Abstract
Background: The concept of allometry states that the relative rate of change of a system unit is a constant fraction of the relative rate of change of the entire system, or of another part of the system.This concept is stated as a nonlinear relationship and has been verified in a variety of natural systems.
Materials and Methods:The allometric relations in various phases of basin evolution in forms of static and dynamic models wasinvestigated.In order to study the dynamic allometry, a model consistingof two basins was developed.The evolution stages and the erosion changes caused by artificial rainfall and tectonic movements and also in static form (natural basins) were monitored.
Results: The existence of allometricrelations in drainage basins that are progressing toward the equilibrium (natural basins and basins affected by erosion) are significant and verifiable.This kind of relations do not exist in tectonic affected basins that were moving away from the equilibrium.
Conclusions:Allometric relations in drainage basins can define different states of system such as equilibrium. Moreover, any factor that causes the basin to move away from equilibrium needs to have an initial effect on basin relations to cause disorder in the system,and this change,in many cases,can be formulated or demonstrated by allometric model. Therefore the allometric equations could be considered an important tool in predicting the evolution of drainage basins and assessing their performance in the past and present.
Volume 8, Issue 4 (10-2006)
Abstract
This research explains the morphometric characteristics of Varroa destructor Anderson and Trueman in Tehran Province. 180 adult female mites were collected from three different colonies of Apis mellifera L. in three apiaries during September 2003 to May 2004. These colonies were divided according to three altitudes-less than 1000m, 1000-1500m and more than 1500m above the sea level. The morphological characteristics of mite samples were examined using light microscopy. Measurements of mite specimens in-cluding body lengths, widths, mean size of leg segments and chelicerae were obtained from 180 females. Data were analyzed using the SAS package. The results revealed that: with 95% confidence intervals, body lengths were 1152.6-1218.9 (for less than 1000m alti-tude), 1163.2-1220.7 (for 1000-1500m altitude) and 1167.1-1228.3 (for grater than 1500m altitude). Also, body widths for those apiaries with 95% confidence intervals were: 1709.8-1818.2, 1712.1-1819.5 and 1720.4-1820.6, respectively. Mean body lengths were 1197.2, 1199.2 and 1200.1 and mean body widths were 1775.6, 1781.7 and 1789.9, respec-tively. No significant differences were observed between the size of leg segments and che-licerae among specimens studied. Comparison between measurements of body lengths and widths of specimens which were collected from Firozkoh (above 1500m altitude), Karaj(1000-1500m altitude) and apiaries in Varamin (less than 1000m altitude) in Tehran Province revealed that there was no significant difference between the three colonies. These specimens were also differ from V. jacobsoni. The results showed that our speci-mens were V. destructor not V. jacobsoni. Moreover, the Tehran Province specimens are similar to V. destructor in that they are less spherical than V. jacobsoni.
Karaneh Parizadeh, Abdolhossein Dalimi,
Volume 11, Issue 2 (5-2022)
Abstract
So far, very limited research has been done on Euryglossa orientalis parasites in our country. In the present study, helminthic infection of 50 digestive tracts of E. orientalis, were examined in Bandar Abbas in 2016. After procuring the fishes, they were transferred to the laboratory and different parts of their bodies were measured for a morphometric study. Then whole digestive tract of the fishes was removed, opened with a small scissor into a dish and the contents was searched for the presence of helminth. Then, the isolated helminth parasites were fixed in 5% formalin or 70% ethanol and stained with azocarmine. The parasites were identified with the aid of reliable sources. The results indicated that out of 50 fish tested, only 5 fish (10%) were infected with the parasite. Thus, in 10% of the fish, Plagiocirrus primus and in 2% of them, Lepocreadioides zebrini and Scolex pleuronectis were identified. This result shows that the infection of Euryglossa orientalis with helminths is mild in the coasts of Bandar Abbas in summer. P. primus is reported for the first time from Persian Gulf coasts.
