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

The scope for growth as a proportion of the energy absorbed and is а measure of the efficiency with which the food is converted into body tissues. It is mentioned in both net and gross growth efficiency. In this study, the scope for growth and growth efficiency of the bivalve Azumapecten ruschenbergerii have been investigated at Chabahar Bay before and after summer monsoon, as a laboratory experiment. Monsoonal climate dominates the northern Indian Ocean, and its effects felt in summer and winter with stronger winds in summer. According to this, the study on the energy budget of mentioned bivalve at 19 to 33 °C showed that the average of both indices has significant increase after summer monsoon (P<0.001). The results indicated that A. ruschenbergerii is opposed to better condition and less stress after the monsoon.

Environmental quality assessments recommend use of sessile invertebrates. Because, they are unable to escape from environmental deterioration. In addition, the ability of adaptive responses to such environmental change, would determine its survival and reproduction potential. The organism adaptability may therefore be defined by its capacity to adjust the physiology to operate with optimal efficiency in a variable environment. Indicators that are discussed in this field for Azumapecten ruschenbergerii, at the Chabahar Bay and in the time before and after the monsoon, include: the ratio of consumed oxygen to excreted nitrogen and body condition index. The first is widely used to study the metabolism of animals. The second is the occupied space of internal volume of the shell by the body. Accordingly, stress indices were determined and statistically evaluated. The average of both indices was associated with significant changes (increase for the first and decrease for the second one) in relation to pre- and post-monsoon period (P<0.05). Evaluating both indicators suggests less environmental stress in the post-monsoon period to this bivalve living in sampling sites

In the present study, energy budget of dominant bivalve of the Oman Sea, Azumapecten ruschenbergerii, was evaluated at Chabahar Bay subjected to changes of temperature and food, before and after monsoon. Scope for growth (SFG) is used to indicate ecophysiological condition of animals. It is determined in studying energy budget. SFG values were calculated for seawater temperature, lower and higher temperatures, and also when pecten fed with different microalgae. Furthermore, enthalpy of its adductor muscle was calculated and subjected to statistical analysis. Averages of SFG values were negative before and positive after monsoon. SFG values were generally higher when fed with Microalgae Dunaliella sp. Moreover, despite of significant difference between SFG values before and after monsoon, enthalpies of adductor muscles (edible part) have not shown significant difference. So, this study suggests that 1) The above mentioned Microalgae has more feeding efficiency, 2) This mollusk had more excreting than absorbed energy and 3) It can be one of the best animals in aquaculture purposes and an effective factor to reduce blooming in aquatic areas.