scholarly journals ANIMAL SEARCH STRATEGIES: A QUANTITATIVE RANDOM-WALK ANALYSIS

Ecology ◽  
2005 ◽  
Vol 86 (11) ◽  
pp. 3078-3087 ◽  
Author(s):  
Frederic Bartumeus ◽  
M. G E. da Luz ◽  
G. M. Viswanathan ◽  
J. Catalan
Keyword(s):  
Random Walk ◽  
Search Strategies ◽  
Random Walk Analysis

scholarly journals Random walk analysis of potassium fluxes associated with nerve impulses.

1977 ◽  
Vol 74 (12) ◽  
pp. 5543-5546 ◽  
Author(s):  
J. R. Clay ◽  
M. F. Shlesinger
Keyword(s):  
Random Walk ◽  
Nerve Impulses ◽  
Random Walk Analysis

scholarly journals The response of human neutrophils to a chemotactic tripeptide (N-formyl- methionyl-leucyl-phenylalanine) studied by microcinematography

Blood ◽  
1984 ◽  
Vol 64 (1) ◽  
pp. 221-228 ◽  
Author(s):  
J Maher ◽  
JV Martell ◽  
BA Brantley ◽  
EB Cox ◽  
JE Niedel ◽  
...  
Keyword(s):  
Random Walk ◽  
Cell Surface ◽  
Linear Displacement ◽  
Human Neutrophils ◽  
Human Granulocytes ◽  
Stimulation Of ◽  
Random Walk Analysis ◽  
Cellular Motion

A quantitative microcinematographic technique for the measurement of cellular motion in response to chemical influences is described. The data are analyzed by using a magnetic digitizer connected to a computer, permitting comparison of several characteristics of such motion. When human granulocytes are placed in a gradient of formyl- methionyl-leucyl-phenylalanine (fMLP) (concentration 10(-6)-10(-8) mol/L) against buffer, the motion of the cells is increased in velocity (chemokinesis) and is directed toward the chemoattractant, as measured by the orientation of the vector of motion. This directionality is confirmed by positive values for the McCutcheon index and analysis of directed linear displacement. Concentrations of fMLP below 10(-9) mol/L did not result in chemokinesis or chemotaxis, presumably due to insufficient stimulus. Concentrations of 10(-6) mol/L fMLP and greater resulted in marked stimulation of the cell surface but reduced directionality and velocity of motion compared with cells in a more optimal gradient. Motion of the unstimulated cells tended to be ortholinear , and this was not increased by the presence of a gradient of fMLP. Hence, as previously shown, the Random Walk analysis, which does not give weight to the direction of motion, is not useful in the analysis of the response of these cells to a chemotaxin in this system.

scholarly journals Effect of colloids on non-Fickian transport of strontium in sediments elucidated by continuous-time random walk analysis

2019 ◽  
Vol 252 ◽  
pp. 1491-1499 ◽  
Author(s):  
Dong-Xu Liu ◽  
Rui Zuo ◽  
Andrey P. Jivkov ◽  
Jin-Sheng Wang ◽  
Li-Tang Hu ◽  
...  
Keyword(s):  
Random Walk ◽  
Continuous Time ◽  
Continuous Time Random Walk ◽  
Random Walk Analysis

Random walk analysis of time-resolved transmittance measurements

2003 ◽  
Author(s):  
Ines Delfino ◽  
Maria Lepore ◽  
Pietro L. Indovina
Keyword(s):  
Random Walk ◽  
Time Resolved ◽  
Random Walk Analysis

Random Walk Analysis in Antagonistic Stochastic Games

2008 ◽  
Vol 26 (4) ◽  
pp. 738-783 ◽  
Author(s):  
Jewgeni H. Dshalalow
Keyword(s):  
Random Walk ◽  
Stochastic Games ◽  
Random Walk Analysis

Random walk analysis of ranging patterns of sympatric langurs in a complex resource landscape

2013 ◽  
pp. n/a-n/a ◽  
Author(s):  
Rajnish Vandercone ◽  
Kaushalya Premachandra ◽  
Gayan Pradeep Wijethunga ◽  
Chameera Dinadh ◽  
Kithsiri Ranawana ◽  
...  
Keyword(s):  
Random Walk ◽  
Ranging Patterns ◽  
Random Walk Analysis

scholarly journals Simulating search behaviour of fish towards bait

2004 ◽  
Vol 61 (7) ◽  
pp. 1224-1232 ◽  
Author(s):  
Rune Vabø ◽  
Geir Huse ◽  
Anders Fernö ◽  
Terje Jørgensen ◽  
Svein Løkkeborg ◽  
...  
Keyword(s):  
Random Walk ◽  
Gadus Morhua ◽  
Search Strategies ◽  
Fish Movement ◽  
Gradient Search ◽  
Search Behaviour ◽  
Movement Dynamics ◽  
Continuous Strategies ◽  
Counter Current ◽  
Better Than

Abstract Search by olfaction is common in many aquatic animals, and this feature is exploited by the fishing industry, which has a long tradition in the use of longlines, pots, and other kinds of baited gear. Here we discuss a range of possible search strategies that fish might apply when searching for prey; this in order to improve our understanding of fish movement dynamics towards baited gear. Various search strategies were investigated using an individual-based behavioural model. The search phase was divided into plume-search (search for relevant stimuli) and bait-search (search when an olfactory stimulus has been encountered). The search strategies were evaluated based on their efficiency in providing guidance to the goal (plume or bait). The model was developed based on previous tagging studies of cod (Gadus morhua L.). The results for plume-search show that when the landscape is considered to be continuous, strategies based on moving at an angle against the current performed better than strategies moving straight into the current, or “random walk”-based strategies. When it is assumed that the fish is constrained to a home range, the results are reversed so that “random walk”-based strategies perform better than the “counter current” strategies. For bait-search the “counter current” strategies performed much better than strategies based on gradient-search, which rarely resulted in contact with the bait.

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