Correlated random walks (CRW) have been used for a long time as a null model for animal's random search movement in two dimensions (2D). An increasing number of studies focus on animals' movement in three dimensions (3D), but the key properties of CRW, such as the way the mean squared displacement is related to the path length, are well known only in 1D and 2D. In this paper I derive such prope...

Geographical Information Science is challenged by an unprecedented increase in the availability of tracking data related to human and animal movement, typically captured through location-aware portable devices such as GPS receivers. Capture of trajectory data at fine temporal and spatial granularities has allowed with the representation of detailed geospatial lifelines, opening new options for ...

[1] We have discovered a prominent >190 km long, 0.5– 6 km wide lava channel on Io. The channel is sinuous with interior islands andmay be associatedwith the active Tawhaki Patera hotspot. Photoclinometric analysis of the Galileo images indicates that this channel, provisionally named Tawhaki Vallis, is 40 – 65 m deep. Although a constructional contribution cannot be ruled out, the depth, morph...

Recent gullies are erosional landforms developed on hillslopes in recent Martian time (less than 10 My). The nature of the fluid that created the erosion was initially considered as debris flows, but this is still under discussion. Indeed, hypotheses invoking only dry granular slides explain many characteristics of the gullies channels, their size, length, presence of levees and terminal deposi...

For centuries fishers have exploited the propensity for tuna to associate with floating objects, yet reasons and mechanisms behind this behavior remain unclear. The number of man-made objects (FADs, Fish Aggregating Devices) undergone a dramatic increase in recent decades, development industrial purse seine fishing. However, current knowledge does not allow evaluation consequences on ecology tu...