Models of genetic drift as limiting forms of the Lotka-Volterra competition model

The relationship between the Moran model and stochastic Lotka-Volterra competition (SLVC) model is explored via timescale separation arguments. For neutral systems the two are found to be equivalent at long times. For systems with selective pressure, their behavior differs. It is argued that the SLVC is preferable to the Moran model since in the SLVC population size is regulated by competition, rather than arbitrarily fixed as in the Moran model. As a consequence, ambiguities found in the Moran model associated with the introduction of more complex processes, such as selection, are avoided.Comment: 5 pages, 4 figure

Feasibility and stability in large Lotka Volterra systems with interaction structure

Complex system stability can be studied via linear stability analysis using Random Matrix Theory (RMT) or via feasibility (requiring positive equilibrium abundances). Both approaches highlight the importance of interaction structure. Here we show, analytically and numerically, how RMT and feasibility approaches can be complementary. In generalised Lotka-Volterra (GLV) models with random interaction matrices, feasibility increases when predator-prey interactions increase; increasing competition/mutualism has the opposite effect. These changes have crucial impact on the stability of the GLV model.Comment: Manuscript is 8 pages long, containing 4 figures. Pages 9 to 25 is the Supplemental Materia

SIKAP TERHADAP FOTO PREWEDDING PADA DEWASA AWAL

Marriage is a sacred and important part of human development in their lifetime. The custom of marriage nowadays keeps evolving in every aspect, including pre-wedding photo shoot. Pre-wedding photo shoot is a photo session that is done before the wedding takes place and the resulting photographs are being used for various purposes during the wedding. In Indonesia, pre-wedding photo shoot is often being considered as something that is against local customs, norms, and religious values. This is caused by the fact that during the photo session, couples that are not married yet often engage in intimate poses for the photo shoot. The purpose of this study is to investigate individuals in early adulthood’s attitude towards pre-wedding photo shoot. This study employs quantitative descriptive approach. The subjects of this study are 350 students of University of Muhammadiyah Malang where the sampling technique being used is non-probability sampling, specifically incidental sampling. The data was gathered using attitude towards pre-wedding shoot scale. Descriptive test showed that 59,1% of the subjects have a positive attitude towards pre-wedding photo shoot