Larval social cues influence testicular investment in an insect

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外文摘要：Socio-sexual environment can have critical impacts on reproduction and survival of animals.Consequently,they need to prepare themselves by allocating more resources to competitive traits that give them advantages in the particular social setting they have been perceiving.Evidence shows that a male usually raises his investment in sperm after he detects the current or future in-crease of sperm competition because relative sperm numbers can determine his paternity share.This leads to the wide use of testis size as an index of the sperm competition level,yet testis size does not always reflect sperm production.To date,it is not clear whether male animals fine-tune their resource allocation to sperm production and other traits as a response to social cues during their growth and development.Using a polygamous insect Ephestia kuehniella,we tested whether and how larval social environment affected sperm production,testis size,and body weight.We exposed the male larvae to different juvenile socio-sexual cues and measured these traits.We demonstrate that regardless of sex ratio,group-reared males produced more eupyrenes(fertile and nucleate sperm)but smaller testes than singly reared ones,and that body weight and apyrene(infertile and anucleate sperm)numbers remained the same across treatments.We conclude that the presence of larval social,but not sexual cues is responsible for the increase of eupyrene pro-duction and decrease of testis size.We suggest that male larvae increase investment in fertile sperm cells and reduce investment in other testicular tissues in the presence of conspecific juvenile cues.

外文关键词：

body weightimmature stagepyralidaesperm productionsocial environmenttestis size

作者：

Junyan LIU、Xiong Z.HE、Xia-Lin ZHENG、Yujing ZHANG、Qiao WANG

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作者单位：

School of Agriculture and Environment,Massey University,Palmerston North 4100,New Zealand

Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety,National Demonstration Centre for Experimental Plant Science Education,College of Agriculture,Guangxi University,Nanning 530004,China

基金：

a China Scholarship Council-Massey University PhD Scholars Programmea Guangxi University Foundation Strengthening Program Postgraduate Overseas Research Projecta Guangxi Scholarship Fund of Guangxi Education DepartmentMassey University Research Funds

项目编号：

CSC 201806660018

出版年：

2022

DOI：

10.1093/cz/zoab028

动物学报(英文版)

中国科学院动物研究所,中国动物学会

动物学报(英文版)

CSCDSCI

影响因子：0.198

ISSN：1674-5507

年,卷(期)：2022.68(1)

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