Search strategies of ants in landmark-rich habitats.
Search is an important tool in an ant's navigational toolbox to relocate food sources and find the inconspicuous nest entrance. In habitats where landmark information is sparse, homing ants travel their entire home vector before searching systematically with ever increasing loops. Search strategies have not been previously investigated in ants that inhabit landmark-rich habitats where they typically establish stereotypical routes. Here we examine the search strategy in one such ant, Melophorus bagoti, by confining their foraging in one-dimensional channels to determine if their search pattern changes with experience, location of distant cues and altered distance on the homebound journey. Irrespective of conditions, we found ants exhibit a progressive search that drifted towards the fictive nest and beyond. Segments moving away from the start of the homeward journey were longer than segments heading back towards the start. The right tail distribution of segment lengths was well fitted by a power function, but slopes less than -3 on a log-log plot indicate that the process cannot be characterized as Lévy searches that have optimal slopes near -2. A double exponential function fits the distribution of segment lengths better, supporting another theoretically optimal search pattern, the composite Brownian walk.
Narendra
Ajay
A
Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia. ajay.narendra@anu.edu.au
Cheng
Ken
K
Sulikowski
Danielle
D
Wehner
Rüdiger
R
D000818:Animals; D001000:Ants / Q000502:physiology*; D001070:Appetitive Behavior / Q000502:physiology*; D001522:Behavior, Animal; D003889:Desert Climate; D017753:Ecosystem; D005106:Exploratory Behavior / Q000502:physiology*; D005247:Feeding Behavior / Q000502:physiology; D013028:Space Perception / Q000502:physiology*
Ecology. 2007 Aug;88(8):1955-61
17824426
Nature. 1999 Oct 28;401(6756):911-4
10553906
J Exp Biol. 2007 May;210(Pt 10):1798-803
17488943
J Anim Ecol. 2007 Mar;76(2):222-9
17302829
J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2003 Aug;189(8):579-88
12879352
Nature. 2007 Oct 25;449(7165):1044-8
17960243
Proc Natl Acad Sci U S A. 2008 Jan 8;105(1):317-22
18160534
J Exp Biol. 2007 Feb;210(Pt 4):570-7
17267642
J R Soc Interface. 2008 Sep 6;5(26):1077-86
18292078
J Exp Biol. 2007 May;210(Pt 10):1804-12
17488944
J Exp Biol. 1996;199(Pt 1):129-40
9317483
Neurobiol Learn Mem. 2005 Jan;83(1):1-12
15607683
Biol Cybern. 2000 Sep;83(3):245-59
11007299
Ecology. 2007 Aug;88(8):1962-9
17824427
Curr Biol. 2006 Nov 7;16(21):R916-7
17084686
Proc Natl Acad Sci U S A. 1988 Jul;85(14):5287-90
16593958
Proc Biol Sci. 2004 Jul 22;271(1547):1485-9
15306320
Phys Rev Lett. 2002 Mar 4;88(9):097901
11864054
Curr Biol. 2006 Jan 10;16(1):75-9
16401425
J Exp Biol. 2006 Sep;209(Pt 18):3545-9
16943494
Nature. 2008 Feb 28;451(7182):1098-102
18305542