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Experimental evolution reveals that population density does not affect moth signalling behaviour and antennal morphology

Content Provider	Springer Nature Link
Author	Ashman, Kita R. McNamara, Kathryn B. Symonds, Matthew R. E.
Copyright Year	2016
Abstract	Population density can play a vital role in determining investment in reproductive behaviours and morphologies of invertebrates. Males reared in high-density environments, where competition is high but difficulties in locating mates are low, may invest more in reproductive structures associated with sperm competition such as testes, at the expense of those traits associated with mate location, such as antennae. In species where females advertise for mates, such as most moths, a high-density environment may also lead to a reduction in pheromonal signalling (calling) length and frequency as a result of high mate abundance. While such responses have been shown at the phenotypically plastic level in moths, heritable evolutionary adaptations have seldom been tested, and studies of how population density influences pheromone signalling strategies are scarce. Here we use behavioural assays and scanning electron microscopic measurements to test whether larval population density influences, at the genetic level, the ability of males to locate females and male investment into antennal morphology, in addition to its effect on the frequency and duration of female calling. We used two replicated populations of the Indian meal moth Plodia interpunctella that had experimentally evolved under high or low population densities for 35 generations. We found no significant divergence in antennal morphology or mate acquisition behaviours between the two density populations. These findings suggest that although population density has the ability to create plastic changes in both morphological and behavioural traits, this factor alone is unlikely to be causing evolutionary change in male and female signalling in this species.
Starting Page	1009
Ending Page	1021
Page Count	13
File Format	PDF
ISSN	02697653
Journal	Evolutionary Ecology
Volume Number	30
Issue Number	6
e-ISSN	15738477
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-09-16
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antennal morphology Lepidoptera Scanning electron microscopy Sex pheromone Sexual selection Signalling Receiver Plodia interpunctella Calling behaviour Evolutionary Biology Ecology Plant Sciences Animal Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Data from: Experimental evolution reveals divergence in female genital teeth morphology in response to sexual conflict intensity in a moth (Dataset)

Data from: Experimental evolution reveals differences between phenotypic and evolutionary responses to population density (Dataset)

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PLODIA INTERPUNCTELLA (HUBNER) (LEPIDOPTERA:PYRALIDAE)

PLODIA INTERPUNCTELLA (HUBNER) (LEPIDOPTERA:PYRALIDAE)

Experimental evolution reveals that population density does not affect moth signalling behaviour and antennal morphology

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Experimental evolution reveals that population density does not affect moth signalling behaviour and antennal morphology