Presence Of Paths Research Articles

Barrows in action. Late Neolithic and Middle Bronze Age Barrow Landscapes in the Upper Dniester Basin, Ukraine

Abstract The aim of this article is to view the spatial distribution of Upper Dniester Basin’s (Western Ukraine) barrows and to interpret their location principles. These monuments were often situated on the flattened summits of watershed ridges or hills. It appeared also that some of them were located on upper parts of gentle slopes of not more than 8° of inclination. Mounds appear within linear and group-linear arrangements and were rarely observed as clusters, while more specific adjustments to their location were dependant on local terrain morphology. Barrow alignments run along the elevated ridges, while clustered groups were situated in places where erosive indentations or denudation cavities prevented barrows from stretching in a linear pattern. It can be noted that during the spatial development of barrow alignments, more attention was paid to the intervisibility between the mounds, than to their visibility from other places in the landscape. The potential of observing at least one of the following groups of tumuli from every embankment indicates the direction of movement within the framework of the barrow landscape, perhaps augmented in the past by the presence of paths or “roads”. Examples of analogous or similar, in a certain sense even universal, practices in shaping barrow landscapes were documented also from various parts of Eurasia. Therefore, it is argued these traits were shared by all “barrow societies” and their origins can be traced to the steppe zone. Specific and repeatable patterns of barrow arrangements are a manifestation of certain knowledge and skills, transmitted over generations and immortalized in the landscape that symbolized the incorporation of territory by “barrow societies”. Characteristic mound alignments became a cultural code or institution, as it were – an instrument of familiarising previously unknown landscapes, facilitating movement and simultaneously expressing continuity of kin-lineages.

Fruit production along roads and footpaths in an Atlantic rain forest area

ABSTRACTBackground: Pathways (footpaths and roads) in forests are associated with edge effects, affecting forest structure and composition and associated wildlife. However, little is known about how edge effects along pathways may impact the dynamics of fruit production and their availability for frugivores.Aim: We related pathway width as a proxy for edge effects to fruit production. Our underlying hypothesis was that pathway width would be positively related to fruit production.Methods: We observed fruit production along three pathways of different widths – 2, 10 and 20 m wide – and in a control area of undisturbed forest in an Atlantic rain forest stand monthly over a 2-year period.Results: The number of species and individuals-bearing fruit was higher along the wider pathways than along the narrowest pathway and in the control area. The amount of zoochorous fruits was higher in the control area than along pathways, and the widest pathway had higher non-zoochorous fruits production. Fruiting peaks occurred along pathways, while fruiting in the control area was aseasonal.Conclusions: Pathway width is related to fruit type and its quantity and temporal availability. These effects extend towards the forest interior beyond 35 m. The presence of paths affects food resources for frugivores and thus can contribute to reconfiguring the spatio-temporal distribution of the fauna.

Evaluating the Impacts of Hunting Paths on Northern Bobwhite Survival, Economic Costs, and Hunter Satisfaction

The amount and spatial configuration of habitat is known to influence the abundance, movements, resource use, and persistence of many species. As such, land managers must be judicious in their application of management actions to minimize its impact on wildlife while concurrently providing recreational opportunities. Mowing or roller-chopping is a common management technique implemented on intensively managed northern bobwhite (Colinus virginianus) plantations to increase hunter accessibility, provide travel corridors for pointing dogs, manage vegetation succession, among other benefits. Managers typically create hunting paths in a grid pattern at 30 ft spacing resulting in approximately 35% of vegetation removed prior to hunting season. However, the optimal spacing for paths is unknown and some concern exists over the presence of paths in general as they may facilitate predation. Our objectives were to determine how different densities of paths (i.e., reduced cover and increased edge) impacted northern bobwhite survival, quantify the costs per hectare of paths, and determine hunter satisfaction. We developed two path treatments (30 ft and 90 ft spacing) and a control (no paths) on Tall Timbers Research Station in Leon County, Florida. We radio-tagged a subset of northern bobwhites (n = 150), equally distributed within each treatment, and monitored survival in each treatment using radio-telemetry during the non-breeding season (October through April) in 2013-2016. We used Burnham’s joint model within program MARK to compare survival of radio-tagged bobwhites among treatment groups. We analyzed data collected from a hand-held global positioning system used to delineate paths during creation to compute implementation cost. Hunter satisfaction was assessed using a pre- and post-hunt survey. Optimization will be used to determine which treatment achieves the greatest utility under current management objectives. Results of this research will provide managers information to make informed decisions about the implementation of hunting paths under various management scenarios.

Mediterranean coastal sand dune vegetation: influence of natural and anthropogenic factors.

The aim of the present work was to assess the conservation status of coastal dune systems in Tuscany (Italy). Emphasis was given to the presence and abundance of plant communities identified as habitat in accordance with the Directive 92/43/EEC. Twenty transects perpendicular to the shoreline were randomly positioned on the whole coastal area (30km in length) in order to sample the full spectrum of plant communities. Vegetation zonation and relationships with the most frequent disturbance factors in the study area-beach cleaning, coastline erosion, presence of paths and roads, bathing settlements and trampling-were investigated through principal coordinate analysis and canonical correspondence analysis. Natural factors, such as distance from the sea and total length, were also considered. Differences in the conservation status of the sites were found, ranging from the total disappearance of the foredune habitats to the presence of the complete psammophilous (sand-loving) plant communities. Erosion, trampling, and paths were found to be closely correlated with degradation and habitat loss. Furthermore, the overall plant species diversity of dunes was measured with NHDune, a modified version of the Shannon index; while the incidence of invasive taxa was calculated using N, a naturalness index. However, these diversity indices proved to be a weaker bioindicator of ecosystem integrity than habitat composition along transects. A possible strategy for the conservation and management of these coastal areas could be to protect the foredunes from erosion and limit trampling through the installation of footbridges or the use of appropriate fences.

歩行経路観測に基づく重要点抽出による移動ロボットナビゲーション

In this paper, we investigate a mobile robot navigation system which can localize the mobile robot correctly and navigate based on observation of human walking in order to operate in a space populated by humans with minimal disturbance to them. To realize this system, we utilize multiple intelligent devices embedded in the environment. The human walking paths are obtained from a distributed vision system. We extract important points from observation and build a topological map of nodes which are important points and of edges which are added based on the presence of paths between important points. In addition, the human walking paths between two important points are averaged to get frequently used paths. The averaged paths are utilized as paths of the mobile robots. The mobile robot navigation based on observation of human is also performed with the support of the system. The position and orientation of the mobile robot are estimated from wheel encoder and distributed vision system measurement data using an extended Kalman filter. The system navigates the mobile robot along the frequently used paths by tracking control.

Importance of gravel pits for the conservation of waterbirds in the Garonne river floodplain (southwest France)

The loss of natural wetlands throughout the World has made created habitats such as gravel pits, reservoirs or rice fields potentially important for waterbird conservation. In southwest France, the increasing abundance of gravel pits has allowed several bird species to colonize the region. The avian community was studied from 1996 to 1998 in six gravel pits in the Garonne floodplain. A total of 39 species of waterbirds were recorded, with higher abundance during the winter and post-breeding periods. We analyzed habitat use to identify key environmental factors determining the temporal and spatial distribution of the avian community. The presence of submerged macrophytes was found to be the most important factor influencing the distribution of waterbirds. The presence of paths in the vicinity of the areas reduced both the total number of birds and species richness owing to human disturbance. Gravel pits have an increasingly important role in the conservation of bird biodiversity. By controlling disturbance and management of vegetation, managers can enhance this role.