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1. Development of new microsatellite loci for wing dimorphic crickets Velarifictorus aspersus and their cross-utility in other Gryllidae species

Author:
Zeng, Yang; Zhou, Ze-Lin; He, Yi-Yuan; Zhu, Dao-Hong
Source:
Journal of Asia-Pacific entomology 2021 v.24 no.2 pp. 30-34
ISSN:
1226-8615
Subject:
sperm competition,   etc   ; Gryllidae; entomology; genetic variation; microsatellite repeats; transcriptome;     Show all 6 Subjects
Abstract:
... Microsatellite markers have been used extensively in studies of sperm competition and the genetic diversity of organisms. In the present study, we performed transcriptome sequencing for Velarifictorus aspersus and developed simple sequence repeat markers to identify valuable markers for genetic studies. The average total length of the V. aspersus transcriptome sequence was 7.70 Gb and it contained ...
DOI:
10.1016/j.aspen.2021.04.007

2. Skilful mating? Insights from animal contest research

Author:
Lane, Sarah M.; Briffa, Mark
Source:
Animal behaviour 2021
ISSN:
0003-3472
Subject:
sperm competition,   etc   ; animal behavior; animals; courtship; ownership; reproductive success;     Show all 6 Subjects
Abstract:
... Whenever resources are limited and indivisible, fighting will evolve as a means to resolve ownership. Among such resources are mates, and individuals (usually males) of many species compete agonistically with rivals in order to gain access to potential mates. However, securing access is not necessarily enough to guarantee a mating or, if a mating is obtained, to guarantee that it is effective for ...
DOI:
10.1016/j.anbehav.2021.03.006

3. Sexual selection and personality: Individual and group‐level effects on mating behaviour in red junglefowl

Author:
Roth, Allison M.; Dingemanse, Niels J.; Nakagawa, Shinichi; McDonald, Grant C.; Løvlie, Hanne; Robledo‐Ruiz, Diana A.; Pizzari, Tommaso
Source:
The journal of animal ecology 2021 v.90 no.5 pp. 1288-1306
ISSN:
0021-8790
Subject:
sperm competition,   etc   ; Gallus gallus; animal ecology; animals; males; personality; sex ratio; sexual selection; social environment;     Show all 9 Subjects
Abstract:
... Despite increasing evidence of the importance of repeatable among‐individual differences in behaviour (animal personality) in ecology and evolution, little remains known about the role of animal personalities in sexual selection. Here, we present an investigation of the hypothesis that the personalities of individuals and their sexual partners play a role in different episodes of sexual selection, ...
DOI:
10.1111/1365-2656.13454

4. Trade‐offs between weapons and testes do not manifest at high social densities

Author:
Miller, Christine W.; Joseph, Paul N.; Emberts, Zachary
Source:
Journal of evolutionary biology 2021 v.34 no.5 pp. 726-735
ISSN:
1010-061X
Subject:
sperm competition,   etc   ; Narnia; adulthood; autotomy; cacti and succulents; evolutionary biology; hindlimbs; resource allocation;     Show all 8 Subjects
Abstract:
... Social conditions can alter the allocation of resources to reproductive traits. For example, an increase in social density during development is frequently associated with an increase in the testes mass of males. Sperm competition theory assumes that increased investment in testes should come at the expense of investing into precopulatory traits, such as sexually selected weaponry. However, much r ...
DOI:
10.1111/jeb.13790

5. Longer and faster sperm exhibit better fertilization success in Japanese quail

Author:
Matsuzaki, Mei; Hirohashi, Noritaka; Tsudzuki, Masaoki; Haqani, Mohammad Ibrahim; Maeda, Teruo; Mizushima, Shusei; Sasanami, Tomohiro
Source:
Poultry science 2021 v.100 no.4 pp. 100980
ISSN:
0032-5791
Subject:
sperm competition,   etc   ; Coturnix japonica; artificial insemination; color; female reproductive system; flagellum; fluorescence; males; paternity; quails; spermatozoa; viscosity;     Show all 12 Subjects
Abstract:
... In birds, sperm storage tubules (SST) located in the utero-vaginal junction are thought to be a site of sperm selection; however, the exact mechanism of sperm selection is poorly understood. Here, we investigated sperm entry into the SST and subsequent fertilization success under a competitive situation created by artificial insemination of a sperm mixture obtained from 2 males. We employed 2 quai ...
DOI:
10.1016/j.psj.2021.01.003

6. Long-term storage shapes ejaculate traits in a monogamous stingless bee (Scaptotrigona aff. depilis)

Author:
Koffler, Sheina; Hoppe, Andreas; Bienefeld, Kaspar; Kleinert, Astrid de Matos Peixoto; Jaffé, Rodolfo
Source:
Apidologie 2021 v.52 no.1 pp. 242-251
ISSN:
0044-8435
Subject:
sperm competition,   etc   ; Scaptotrigona; evolution; genetic variance; heritability; males; monogamy; phenotype; social insects; spermatozoa; stingless bees; storage time; viability;     Show all 13 Subjects
Abstract:
... The influence of long-term storage on the evolution of social insect male ejaculates remains a puzzle. Here, we studied the influence of sperm storage on male ejaculates in the stingless bee Scaptotrigona aff. depilis, a species where queens mate with a single male and thus do not trigger sperm competition. We estimated quantitative genetic parameters by sampling males from six colonies and two co ...
DOI:
10.1007/s13592-020-00813-x

7. The development, evaluation, and illustration of a timeline procedure for testing the role of sperm competition in the evolution of sexual traits using paternity data

Author:
Baker, R. Robin; Shackelford, Todd K.
Source:
Behavioral ecology and sociobiology 2020 v.74 no.9 pp. 106
ISSN:
0340-5443
Subject:
sperm competition,   etc   ; ecology; empirical research; genes; paternity; phylogeny; sociobiology;     Show all 7 Subjects
Abstract:
... The empirical study of the role of sperm competition in the evolution of sexual traits has historically been problematic through the inability either to measure sperm competition levels directly in the present or to reconstruct changes in the evolutionary past. Here, we develop and test a procedure based on paternity data that potentially permits both. For our pilot study, we use the rate of chang ...
DOI:
10.1007/s00265-020-02889-y

8. Functional morphology of immature mating in a widow spider

Author:
Sentenská, Lenka; Neumann, Aileen; Lubin, Yael; Uhl, Gabriele
Source:
Frontiers in zoology 2021 v.18 no.1 pp. 19
ISSN:
1742-9994
Subject:
sperm competition,   etc   ; Latrodectus geometricus; adulthood; adults; cannibalism; female genitalia; females; histology; light microscopy; males; micro-computed tomography; molting; paternity; probability; spermatheca; spermatozoa; spiders;     Show all 17 Subjects
Abstract:
... BACKGROUND: Mating generally occurs after individuals reach adulthood. In many arthropods including spiders, the adult stage is marked by a final moult after which the genitalia are fully developed and functional. In several widow spider species (genus Latrodectus), however, immature females may mate a few days before they moult to adulthood, i.e. in their late-subadult stage. While the “adult” ma ...
DOI:
10.1186/s12983-021-00404-1

9. Sperm competition in golden cuttlefish Sepia esculenta: The impact of mating order and male size

Author:
Guo, Haoyu; Zhang, Dongxue; Wang, Liang; Li, Wentao; He, Pingguo; Näslund, Joacim; Zhang, Xiumei
Source:
Aquaculture 2021 v.530 pp. 735929
ISSN:
0044-8486
Subject:
sperm competition,   etc   ; Sepia; breeding season; eggs; evolutionary biology; females; genetic markers; genetic variation; males; mating systems; microsatellite repeats; paternity; polyandry; progeny; seedling production; spermatozoa; storage organs;     Show all 17 Subjects
Abstract:
... Sperm competition, as the last form of male competition prior to fertilization, is an important component in the reproductive and evolutionary biology of polyandrous species. Golden cuttlefish (Sepia esculenta) is a commercially important annual cephalopod, in which females often mate with multiple males during their mating season and maintain viable sperm in their sperm storage organs for a long ...
DOI:
10.1016/j.aquaculture.2020.735929

10. Male body size does not affect the refractory period of females in the West Indian sweet potato weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) and the seed bug Togo hemipterus (Scott) (Heteroptera: Lygaeidae)

Author:
Himuro, Chihiro; Honma, Atsushi; Ikegawa, Yusuke; Ohishi, Tsuyoshi; Miyatake, Takahisa
Source:
Journal of ethology 2021 v.39 no.1 pp. 39-46
ISSN:
0289-0771
Subject:
sperm competition,   etc   ; Cylas formicarius elegantulus; Euscepes postfasciatus; Lygaeidae; Togo hemipterus; animal behavior; body size; females; males; risk; risk reduction; sexual selection; variance;     Show all 13 Subjects
Abstract:
... Multiple mating by females increases both the risk and intensity of sperm competition for males. The ability to temporarily or permanently inhibit female receptivity to further mating represents a highly adaptive strategy to reduce the risk of sperm competition. Males of the West Indian sweet potato weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) and the seed bug Togo hemipte ...
DOI:
10.1007/s10164-020-00669-9

11. Sexual selection and sperm diversity in primates

Author:
Martinez, Guillaume; Garcia, Cécile
Source:
Molecular and cellular endocrinology 2020 v.518 pp. 110974
ISSN:
0303-7207
Subject:
sperm competition,   etc   ; females; human reproduction; males; reproductive behavior; sexual selection; spermatozoa; testosterone;     Show all 8 Subjects
Abstract:
... Many aspects of primate sperm physiology and reproductive behavior have been influenced by sexual selection, especially in taxa exposed to sperm competition where females mate with multiple partners. Primate sperm diversity reflects therefore the evolutionary divergences of the different primate species and the impact of a combination of variables exerting selection pressures on sperm form, functi ...
DOI:
10.1016/j.mce.2020.110974

12. Ovarian fluid proteome variation associates with sperm swimming speed in an externally fertilizing fish

Author:
Johnson, Sheri L.; Borziak, Kirill; Kleffmann, Torsten; Rosengrave, Patrice; Dorus, Steve; Gemmell, Neil J.
Source:
Journal of evolutionary biology 2020 v.33 no.12 pp. 1783-1794
ISSN:
1010-061X
Subject:
sperm competition,   etc   ; Oncorhynchus tshawytscha; calcium; evolutionary biology; females; fish; males; protein composition; proteome; proteomics; spermatozoa; vitellogenin;     Show all 12 Subjects
Abstract:
... Sperm velocity is a key trait that predicts the outcome of sperm competition. By promoting or impeding sperm velocity, females can control fertilization via postcopulatory cryptic female choice. In Chinook salmon, ovarian fluid (OF), which surrounds the ova, mediates sperm velocity according to male and female identity, biasing the outcome of sperm competition towards males with faster sperm. Past ...
DOI:
10.1111/jeb.13717

13. Spatially clustered resources increase male aggregation and mating duration in Drosophila melanogaster

Author:
Churchill, Emily R.; Bridle, Jon R.; Thom, Michael D.F.
Source:
Animal behaviour 2020 v.169 pp. 45-50
ISSN:
0003-3472
Subject:
sperm competition,   etc   ; Drosophila melanogaster; animal behavior; conspecificity; copulation; evolution; group size; males; plasticity; risk;     Show all 10 Subjects
Abstract:
... In environments where females mate multiply, males should adjust their behaviour and physiology in response to the perceived level of sperm competition to maximize their fitness. Evidence of such plasticity has been found in several laboratory and field studies, but little is known about the cues stimulating these responses in natural populations. One way in which males appear to assess sperm comp ...
DOI:
10.1016/j.anbehav.2020.09.002

14. Dunnock social status correlates with sperm speed, but fast sperm does not always equal high fitness

Author:
Lara, Carlos E.; Taylor, Helen R.; Holtmann, Benedikt; Johnson, Sheri L.; Santos, Eduardo S. A.; Gemmell, Neil J.; Nakagawa, Shinichi
Source:
Journal of evolutionary biology 2020 v.33 no.8 pp. 1139-1148
ISSN:
1010-061X
Subject:
sperm competition,   etc   ; Prunella; evolutionary biology; males; monogamy; polyandry; socioeconomic status; sperm quality;     Show all 8 Subjects
Abstract:
... Sperm competition theory predicts that males should modulate sperm investment according to their social status. Sperm speed, one proxy of sperm quality, also influences the outcome of sperm competition because fast sperm cells may fertilize eggs before slow sperm cells. We evaluated whether the social status of males predicted their sperm speed in a wild population of dunnocks (Prunella modularis) ...
DOI:
10.1111/jeb.13655

15. Consequences of advanced maternal age on reproductive investment by male offspring

Author:
Wilson, Jacob D.; Anner, Sophia C.; Murphy, Shannon M.; Tinghitella, Robin M.
Source:
Journal of orthoptera research 2020 v.29 no.1 pp. 71-76
ISSN:
1937-2426
Subject:
sperm competition,   etc   ; Orthoptera; body size; cell viability; eggs; females; males; progeny; reproductive traits; spermatophores; spermatozoa; testes;     Show all 12 Subjects
Abstract:
... Maternal age can have contrasting effects on a variety of offspring fitness traits. While the effects of maternal age on offspring traits that are not sex-specific, such as body size and growth rate, as well as on traits specific to females, have been well researched, traits that are specific to male offspring have been understudied. Across taxa, male reproductive investment is a particularly sali ...
DOI:
10.3897/jor.29.39228

16. Effects of two seminal fluid transcripts on post‐mating behaviour in the simultaneously hermaphroditic flatworm Macrostomum lignano

Author:
Weber, Michael; Patlar, Bahar; Ramm, Steven A.
Source:
Journal of evolutionary biology 2020 v.33 no.5 pp. 714-726
ISSN:
1010-061X
Subject:
sperm competition,   etc   ; Platyhelminthes; female genitalia; gene expression; hermaphroditism; pharynx; quantitative genetics; reproductive success; sexual selection; spermatozoa;     Show all 10 Subjects
Abstract:
... The seminal fluid proteins (SFPs) transferred to mating partners along with sperm often play crucial roles in mediating post‐mating sexual selection. One way in which sperm donors can maximize their own reproductive success is by modifying the partner's (sperm recipient's) post‐copulatory behaviour to prevent or delay re‐mating, thereby decreasing the likelihood or intensity of sperm competition. ...
DOI:
10.1111/jeb.13606

17. Relative sexual attractiveness does not influence mate-choice copying in male Trinidadian guppies, Poecilia reticulata

Author:
Pusiak, Ryan J.P.; Auld, Heather L.; Godin, Jean-Guy J.
Source:
Animal behaviour 2020 v.162 pp. 123-133
ISSN:
0003-3472
Subject:
sperm competition,   etc   ; Poecilia reticulata; animal behavior; body length; color; females; males; mating behavior; models; phenotype;     Show all 10 Subjects
Abstract:
... Copying the mate choice of another conspecific by a bystanding observer is a socially mediated alternative mating strategy to independent mate choice. Because increased sperm competition is a potential cost of mate-choice copying, males should be prudent and less likely to copy the observed mate choice of other males when the latter are more sexually attractive than themselves. We tested this hypo ...
DOI:
10.1016/j.anbehav.2020.02.008

18. From One Ejaculate to Another: Transference of Sperm Traits via Seminal Plasma Supplementation in the Ram

Author:
Green, Christine; Rickard, Jessica P.; de Graaf, Simon P.; Crean, Angela J.
Source:
Biology 2020 v.9 no.2
ISSN:
2079-7737
Subject:
sperm competition,   etc   ; Merino; assisted reproductive technologies; rams; risk perception; seminal plasma; sperm motility; sperm quality;     Show all 8 Subjects
Abstract:
... Males can adjust sperm motility instantaneously in response to the perceived risk of sperm competition. The speed of this response suggests that sperm motility is regulated by changes in seminal plasma rather than changes in the sperm cells themselves. Hence, here we test whether inter-ejaculate variation in seminal plasma can be used to alter sperm quality prior to use in assisted reproductive te ...
DOI:
10.3390/biology9020033
PubMed:
32085377
PubMed Central:
PMC7168205

19. Genotype‐by‐environment interactions for seminal fluid expression and sperm competitive ability

Author:
Patlar, Bahar; Ramm, Steven A.
Source:
Journal of evolutionary biology 2020 v.33 no.2 pp. 225-236
ISSN:
1010-061X
Subject:
sperm competition,   etc   ; Platyhelminthes; environmental factors; females; genotype; genotype-environment interaction; hermaphroditism; males; paternity; spermatozoa;     Show all 10 Subjects
Abstract:
... Sperm competition commonly occurs whenever females mate multiply, leading to variation in male paternity success. This can be due to variation in the various traits that might affect sperm competitive ability, which itself depends on both genetic and environmental factors, as well as on genotype‐by‐environment interactions (GEI). Seminal fluid is a major component of the male ejaculate that is oft ...
DOI:
10.1111/jeb.13568

20. Mating failure shapes the patterns of sperm precedence in an insect

Author:
Balfour, Vicki L.; Black, Daniella; Shuker, David M.
Source:
Behavioral ecology and sociobiology 2020 v.74 no.2 pp. 25
ISSN:
0340-5443
Subject:
sperm competition,   etc   ; Lygaeus simulans; copulation; ecology; females; insects; males; paternity; progeny; sexual selection; sociobiology; spermatozoa;     Show all 12 Subjects
Abstract:
... Estimates of last male sperm precedence (P₂) are often used to infer mechanisms of sperm competition, a form of post-copulatory sexual selection. However, high levels of mating failure (i.e. copulations resulting in no offspring) in a population can lead to misinterpretations of sperm competition mechanisms. Through simulations, García-González (2004) illustrated how mating failure could cause bim ...
DOI:
10.1007/s00265-020-2801-x