检索结果-南通市图书馆

sperm allocation strategies in a sperm heteromorphic insect

Current Zoology 2020年第3期66卷 285-292页

作者： Kambiz ESFANDI Xiong Z.HE Qiao WANG School of A griculture and Environment Massey UniversityPrivate Bag 11222Palmerston NorthNew Zealand The New Zealand Institute fo r Plant&Food Research Limited Private Bag 11600Palmerston NorthNew Zealand

Theories predict that in polyandrous species,the focal male should increase sperm allocation per mate in the presence of rivals to gain greater share of paternity,but in the presence of additional mates,he should reduce sperm allocation per mate to save sperm for insemination of more ***,empirical findings are often inconsistent and reasons behind are ***,many studies use copulation duration as an estimate of the number of sperm ***,empirical evidence for such assumption is largely ***,we used a sperm heteromorphic insect Ephestia kuehniella whose males produce two types of sperm,eupyrenes(fertile)and apyrenes(nonfertile),to test these *** allowed focal males to detect chemical and acoustic but no tactile cues from rivals or additional mates both before and during mating and measured copulation duration and sperm allocation in successive *** demonstrate that males transfer significantly more eupyrenes per mate in the presence of rivals and that the sperm allocation pattern persists in successive copulations under this ***,males do not adjust apyrene allocation in response to rivals probably because apyrenes play a relatively minor role in male reproductive *** to a previous study,focal males do not respond to additional mates most likely due to the lack of tactile cues in the present *** reveal that sperm allocation is not a function of copulation duration in this insect for spermatophore formation and delivery occupy most of copulation duration and sperm transfer is complete near the end of copulation.

关键词： sperm allocation sperm competition copulation duration socio-sexual environment

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Juvenile socio-sexual experience determines lifetime sperm expenditure and adult survival in a polygamous moth, Ephestiakuehniella

引用

Insect Science 2023年第1期30卷 232-240页

作者： Junyan Liu Xiong Z.He Xia-Lin Zheng Yujing Zhang Qiao Wang School of Agriculture and Environment Massey UniversityPalmerston NorthNew Zealand Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety National Demonstration Center for Experimental Plant Science EducationCollege of AgricultureGuangxi UniversityNanningChina

Male animals often adjust their sperm investment in response to sperm competition *** date,only a few studies have investigated how juvenile sociosexual settings affect sperm production before adulthood and sperm allocation during the first ***,it is unclear whether juvenile sociosexual experience(1)determines lifetime sperm production and allocation in any animal species;(2)alters the eupyrene:apyrene sperm ratio in lifetime ejaculates of any lepidopteran insects,and(3)influences lifetime ejaculation patterns,number of matings and adult *** we used a polygamous moth,Ephestia kuehniella,to address these *** male adult emergence from juveniles reared at different density and sex ratio,we paired each male with a virgin female daily until his *** dissected each mated female to count the sperm transferred and recorded male longevity and lifetime number of *** demonstrate for the first time that males ejaculated significantly more eupyrenes and apyrenes in their lifetime after their young were exposed to juvenile *** moths continued to produce eupyrene sperm,contradicting the previous predictions for *** eupyrene:apyrene ratio in the lifetime ejaculates remained unchanged in all treatments,suggesting that the sperm ratio is critical for reproductive *** juvenile exposure to other juveniles regardless of sex ratio caused significantly shorter adult longevity and faster decline in sperm ejaculation over successive ***,males from all treatments achieved similar number of matings in their *** study provides insight into adaptive resource allocation by males in response to juvenile sociosexual environment.

关键词： juvenile experience Lepidoptera mating frequency sperm allocation sperm production sperm ratio

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Male larval experience of cues from adult rivals alters lifetime sperm investment patterns in a sperm heteromorphic moth, Ephestia kuehniella

引用

Insect Science 2023年第6期30卷 1773-1783页

作者： Junyan Liu Xiong Zhao He Qiao Wang School of Agriculture and Environment Massey UniversityPalmerston NorthNew Zealand

Male animals may adjust their resource allocations for reproduction and other fitness functions in response to cues from rivals. For instance, adult males increase their investment in sperm for a higher paternity share when they perceive sperm competition risk in their surroundings. In nature, both juveniles and adults may coexist spatially and temporally. Yet, it is not clear how juvenile males of different ages respond to cues from adult rivals and fine-tune their lifetime investment in sperm production and ejaculation in any insect. Here we used the Mediterranean flour moth, Ephestia kuehniella, which produces both fertile eupyrene and infertile apyrene sperm, to explore this question. We demonstrate that the late, but not early, instar larvae are sensitive to adult male cues. As a response, they produce more sperm before emergence and their resultant adults have shorter mating latency and ejaculate more sperm in the first few matings. When the juvenile stage produces more eupyrenes, the adult stops making these sperm, but regardless of the number of apyrenes produced during the juvenile stage, the adult continues to make them. These findings suggest that the number of spermatogonia for eupyrenes may be limited and that for apyrenes may be flexible. Our results show that the insect does not trade off survival, mating frequency, body size, or testis size for sperm production in response to adult males during the larval stage. Knowledge created in the present study offers insight into the stage-dependent sensitivity of juvenile males to cues from adult rivals and subsequent lifetime resource allocations.

关键词： immature stage Lepidoptera spermatogenesis sperm allocation sociosex-ual environment

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：