Two general processes may influence gene flow among populations. One involves divergent selection, wherein the maladaptation of immigrants and hybrids impedes gene flow between ecological environments (i.e. ecological speciation). The other involves geographic features that limit dispersal. We determined the relative influence of these two processes in natural populations of Trinidadian guppies...

In the past, sensors networks in cities have been limited to fixed sensors, embedded in particular locations, under centralised control. Today, new applications can leverage wireless devices and use them as sensors to develop aggregated information. In this paper, we show that the emerging patterns unveiled through the analysis of large sets of aggregated digital footprints can provide novel in...

Swordtails (Xiphophorus; Poeciliidae) have figured prominently in research on fish mating behaviours, sexual selection, and carcinogenesis, but their population structures and dispersal patterns have been relatively neglected. Using nine microsatellite loci, we estimated genetic differentiation in Xiphophorus helleri within and between adjacent streams in Belize. The genetic data were complemen...

Sustainable Marketing and Tourism have gained popularity in academia due to their benefits Society, Environment, the Economy. Although several studies explored international national attractions, there are only limited on a local level. This study aims assess capabilities of Mantayupan Waterfalls' Attraction Dickman's 1995 5As, Mix, Development. The utilized purposive sampling technique with 50...

Fernand MeyerCentre de Morphologie MathématiqueMines-ParisTech () Watersheds, waterfalls, on edge or node weighted graphs 2012 February 29 1 / 201 arXi Introduction The watershed transform is one of the major image segmentation tools [4], used in the community of mathematical morphology and beyond. If the watershed is a successful concept, there is another side of the coin: a number of definiti...

introductionmain trend of ecotourism is nature and its beauties; so finding the beautiful landscapes and evaluating aesthetic values of the area would be considered as one of the principles of recreational planning. scenic beauty is a major component of every encounter with the natural environment in tourism and recreation activities. visual elements of landscape not only present aesthetical va...

We present a novel exploratory method combining line of sight visibility (viewshed analysis) and techniques from social network analysis to investigate archaeological data. At increasing distances different nodes are connected creating a set of networks, which are subsequently described using centrality measures and clustering coefficients. Networks with significant properties are examined in m...

A visual analysis is useful to assess potential impacts our surroundings. There has been tremendous progress toward the optimization, accuracy, and techniques of these analyses. Viewshed analyses are a common type analysis. The purpose this study was identify optimal trade-off between number viewpoints needed generate an accurate viewshed for given route. In study, we focused on identifying how...