Male and female developmental temperature modulate post-copulatory interactions in a beetle

Farrow, Rachel, Deeming, Charles and Eady, Paul (2022) Male and female developmental temperature modulate post-copulatory interactions in a beetle. Journal of Thermal Biology, 103 . p. 103155. ISSN 0306-4565

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Male and female developmental temperature modulate post-copulatory interactions in a beetle
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Sexual selection theory has proven to be fundamental to our understanding of the male-female
15 (sperm-egg) interactions that characterise fertilisation. However, sexual selection does not operate
16 in a void and abiotic environmental factors have been shown to modulate the outcome of pre17
copularory sexual interactions. Environmental modulation of post-copulatory interactions are
18 particularly likely because the form and function of primary reproductive traits appears to be acutely
19 sensitive to temperature stress. Here we report the effects of developmental temperature on female
20 reproductive architecture and the interaction between male and female developmental
21 temperature on the outcome of sperm competition in the bruchid beetle Callosobruchus maculatus.
22 When females were reared at developmental temperatures above and below typical temperatures
23 the bursa copulatrix (site of spermatophore deposition) were smaller and, were either shorter and
24 broader (high temperatures) or longer and thinner (low temperatures) than those reared at
25 intermediate temperatures. Males and females reared at low developmental temperatures were
26 less likely to mate than those reared at higher temperatures. Where copulation occurred, females
27 reared at the highest temperature copulated for longest, whilst males reared at the lowest
28 temperature spent longer in copula. Male developmental temperature had a significant impact on
29 the outcome of sperm competition: males reared at 17oC were largely unsuccessful in sperm
30 competition against control (27oC) males, although some of the variation in the outcome of sperm
31 competition was a product of the interaction between male and female developmental
32 temperature. Our results demonstrate that male-female interactions that characterise pre- and post33
copulatory outcomes are sensitive to developmental temperature and that plasticity in cryptic
34 female preferences could lead to heterogeneous selection on the male reproductive phenotype.

Keywords:Callosobruchus, Thermal stress, sperm competition, development
Subjects:C Biological Sciences > C120 Behavioural Biology
C Biological Sciences > C180 Ecology
C Biological Sciences > C142 Reproductive Biology
C Biological Sciences > C300 Zoology
Divisions:College of Science
ID Code:47847
Deposited On:26 Jan 2022 11:15

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