Three major allelochemicals are pheromones, allomones
, and kairomones.
Perhaps most intriguing are cases in which studies of allomone chemistry reveal a novel suite of compounds that should be tested for trigeminal activity.
Arthropods are well known to use potent exocrine secretions, allomones, to repel predators (Eisner et al., 2005).
The actual list of stimulants is likely much longer, and we believe that a database of arthropod allomones is an excellent place to search for candidates.
We use this method to explore the degree of overlap between known arthropod allomones and known trigeminal stimulants.
We herein focus on relatively volatile allomones and their effects on terrestrial vertebrate predators.
However, in light of the presence of defensive allomone
in the egg mass of another nudibranch species (12), I suggest that the red-pigmented cytoplasm may incorporate a predator deterrent.
Some of these substances, known as allomones
, include suppressants which inhibit the initiation of feeding or oviposition, deterrents which impede the continuation of such processes, and anorexigenics which cause a loss of appetite (Warthen and Morgan 1990).
and kairomones: trans-specific chemical messengers.
Waller (eds.), Phytochemical ecology: allelochemicals, mycotoxins, and insect pheromones and allomones
. Institute of Botany, Academia Sinica, Monograph Series No.
Despite the thrips occasionally reaching high densities (>20 adults/ leaf), they may be protected from predators by defensive allomones
as is known from other thrips species (Blum et al.
Sequestration of allomones
from plants by insects is not unusual, but normally associated with monophagous or oligophagous species.