abstract striped rice stem borer, chilo suppressalis walker (lepidoptera: pyralidae) is a major pest of rice in northern iran. regarding to the importance of population dynamics studies in pest management programs, the population fluctuations of c. suppressalis was studied in central part of mazandaran province (rice research centre of mazandaran) during 2005-2006. the male and female moths wer...

2014 We have employed fourth-order coherence-function theory to study the influence of the partialcoherence properties of pump beams on the laser-induced gratings. First, we examine the formation of molecular reorientational grating. The different roles of phase fluctuation and amplitude fluctuation have been pointed out. A time-delayed method has been proposed to distinguish molecular reorient...

Population dynamics is affected by environmental fluctuations (such as climate variations), which have a characteristic correlation time. Strikingly, the time scale of predictability can be larger for population than underlying fluctuations. Here, we present general mechanism leading to this increase in predictability. We considered colored fluctuation acting on close equilibrium. In framework,...

E. Ranta et al. state (1) that Canadian lynx populations exhibit time-varying synchrony analogous to spatiotemporal patterns produced by their simulation model. Similarities between their model and the lynx data, however, appear to be superficial and exaggerated by their analytical methods. First, a cross-correlation coefficient is a meaningful measure of synchrony only when the population data...

Distance learning universities usually afford their students the flexibility to advance their studies at their own pace. This can lead to a considerable fluctuation of student populations within a programme’s courses. The evolution of the student population may be an important factor in determining the academic viability of a programme as well as the resources that have to be budgeted and admin...

The main primary variables or conditions which directly affect individual fish and, through these, the abundance of fish populations are: food, predation, temperature, salinity and oxygen concentration. These primary variables are altered by several processes, some of which are described in this report, together with different sources of information on environmental variability and biological c...

Aedes Aegypti is the vector of several deadly diseases, including Zika. Effective and sustainable vector control measures must be deployed to keep A. aegypti numbers under control. The distribution of A. Aegypti is subject to spatial and climatic constraints. Using agentbased modeling, we model the population dynamics of A. aegypti subjected to the spatial and climatic constraints of a neighbor...

Understanding temporal variability in population size is important for conservation biology because wide population fluctuations increase the risk of extinction. Previous studies suggested that certain ecological, demographic, life-history and genetic characteristics of species might be related to the degree of their population fluctuations. We checked whether that was the case in a large sampl...