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2018 ; 74
(3
): 239-247
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Gender-specific differences in cannibalism between a laboratory strain and a
field strain of a predatory mite
#MMPMID29470781
Revynthi AM
; Janssen A
; Egas M
Exp Appl Acarol
2018[Mar]; 74
(3
): 239-247
PMID29470781
show ga
Many phytoseiid species, including Phytoseiulus persimilis, are known to engage
in cannibalism when food is scarce and when there is no possibility to disperse.
In nature adult females of P. persimilis are known to disperse when prey is
locally depleted. Males, in contrast, are expected to stay and wait for potential
mates to mature. During this phase, males can obtain food by cannibalizing.
Therefore, we hypothesize that male P. persimilis exhibit a higher tendency to
cannibalize than females. Because rearing conditions in the laboratory usually
prevent dispersal, prolonged culturing may also affect cannibalistic behavior. We
hypothesize that this should especially affect cannibalism by females, because
they consume far more food. We tested these hypotheses by comparing males and
females from two strains, one of which had been in culture for over 20 years,
whereas the other was recently collected from the field. It is known that this
predator can discriminate between kin and non-kin and prefers cannibalizing the
latter, hence to construct lines with high relatedness we created isofemale lines
of these two original strains. We subsequently tested to what extent the adult
females and males of the original strains and the isofemale lines cannibalized
conspecific larvae from the same strain/line in a closed system. Relatedness with
the victims did not affect cannibalistic behavior, but males engaged more often
in cannibalism than females, and females of the laboratory strain engaged more in
cannibalism than those of the field strain, both in agreement with our ideas. We
hypothesize that the difference in cannibalism between the two genders will
increase when they have the alternative to disperse.