We propose a method for partially discretizing a model of an agedependent population dynamics with an additional structure whose growth rate is age-dependent. We give theoretical conditions under which a second order accuracy arises. A priori estimates are obtained. The main result indicates that the sum of these errors converges and is of second order accuracy.

nowadays herbicide reduction and different approaches leading to this goal like split application have been brought to attention. two green house experiments were carried out to investigate the efficiency of single and split application of mesosulfuron-methy+iodosulfuron methyl to control wild oat (avena ludoviciana). the influence of applications intervals and the ratios of the two application...

Little is known about community splitting among dolphins because such events are rare in dolphin populations. A case of a community split was confirmed in a population of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in Japan, where a group of approximately 30 dolphins moved to a new habitat some 60 km from the original habitat. We examined the associations among the dolphins before the c...

Split-plot experimental data are often analyzed as if the came from a completely randomized design. As is well known, ignoring different levels of randomization and replication can lead to serious inferential errors. However, in some experiments, including many ocean global change experiments that motivated this research, variation between whole-plot units may be small relative subplot units. E...

The early life history 7 Abstract The relationship between the biomass of reproductively mature individuals (spawning stock) and the resulting offspring added to the population (recruitment), the stock–recruitment relationship, is a fundamental and challenging problem in all of population biology. The steepness of this relationship is commonly defined as the fraction of recruitment from an unfi...