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Entomopathogenic Nematode Host-search Strategies 21

car

p

sca

p

siambicocer

a

kus

h

raruriobabbaaff

i

arencubafel

t

glasint

ekari

kraulongmo

nt

oregpuer

−1.0

−0.8

−0.6

−0.4

−0.2

0.0

0.2

0.4

0.6

0.8

1.0

na na na

ca

rp

sc

ap

siambicocerakushrar

u

riobabb

aaffi

arencubafeltglasin

tekari

kraulongmontoregpue

r

0

25

50

75

100

125

150

175

200

225

250

Steinernema spp.

Average duration of standing bout

Difference between number finding mobile host

and number finding non-mobile host

(A)

(B)

Fig. 2.1. Variation among species ofSteinernemainfective juveniles in (A) the ratio
between number of infective juveniles finding a mobile host (unrestrainedGalleria
mellonellalarva on the surface of a sand-filled 90 mm Petri dish) minus the number finding
a non-mobile host (G. mellonellalarva buried beneath the surface of a sand-filled 90 mm
Petri dish) divided by the total number of nematodes finding both types of host; and (B) the
average duration of standing bouts. In (A), a value of 1.0 indicates that nematodes only
found the mobile host, a value of−1.0 indicates that nematodes only found the sedentary
host and a value of 0.0 indicates equal ability to find both types of host. The vertical lines
indicate how species were grouped along the continuum between ambush and cruise
foraging based on duration of standing bouts, from left to right the groups are long, medium,
short and none. The labels on thexaxes are the first four letters of the species name
tested.