scholarly journals Ejaculate Allocation and Sperm Characteristics Differ among Alternative Male Types in a Species of Fish with Cooperation and Competition among Unrelated Males

Cells ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2612
Author(s):  
Suzanne H. Alonzo ◽  
Kelly A. Stiver ◽  
Holly K. Kindsvater ◽  
Susan E. Marsh-Rollo ◽  
Bridget Nugent ◽  
...  
Keyword(s):  
Social Interactions ◽  
Sperm Morphology ◽  
Seminal Fluid ◽  
Cell Concentration ◽  
Tail Length ◽  
Past Research ◽  
Sperm Number ◽  
Sperm Characteristics ◽  
Testes Size ◽  
Satellite Males

Sexual selection arising from sperm competition has driven the evolution of immense variation in ejaculate allocation and sperm characteristics not only among species, but also among males within a species. One question that has received little attention is how cooperation among males affects these patterns. Here we ask how male alternative reproductive types differ in testes size, ejaculate production, and sperm morphology in the ocellated wrasse, a marine fish in which unrelated males cooperate and compete during reproduction. Nesting males build nests, court females and provide care. Sneaker males only “sneak” spawn, while satellite males sneak, but also help by chasing away sneakers. We found that satellite males have larger absolute testes than either sneakers or nesting males, despite their cooperative role. Nesting males invested relatively less in testes than either sneakers or satellites. Though sneakers produced smaller ejaculates than either satellite or nesting males, we found no difference among male types in either sperm cell concentration or sperm number, implying sneakers may produce less seminal fluid. Sperm tail length did not differ significantly among male types, but sneaker sperm cells had significantly larger heads than either satellite or nesting male sperm, consistent with past research showing sneakers produce slower sperm. Our results highlight that social interactions among males can influence sperm and ejaculate production.

scholarly journals Correlation between the DNA fragmentation index (DFI) and sperm morphology of infertile patients

2021 ◽  
Author(s):  
Alberto Ferrigno ◽  
Giovanni Ruvolo ◽  
Giuseppina Capra ◽  
Nicola Serra ◽  
Liana Bosco
Keyword(s):  
Dna Fragmentation ◽  
Sperm Morphology ◽  
Seminal Fluid ◽  
Image Analyzer ◽  
Fragmented Dna ◽  
Fragmentation Index ◽  
Group A ◽  
Group B ◽  
Infertile Patients ◽  
Dna Fragmentation Index

Abstract Purpose To evaluate the correlation between the DNA Fragmentation Index (DFI) and sperm morphology in patients undergoing ICSI, as a predictive parameter in reproductive outcomes. Methods A retrospective study was conducted on 125 infertile patients enrolled in a fertility clinic. Seminal characteristics were measured following the WHO guidelines (2010) for the examination of the seminal fluid. After collecting motile sperm population by pellet swim up, DFI was calculated and simultaneously associated with sperm morphology using in situ TUNEL assay and an image analyzer software in at least 250 spermatozoa for each patient. Results All subjects were divided into two groups according to a cutoff established, by choice, of the sperm DFI (15%): group A (< 15%) consisting of 65 patients and group B (≥ 15%) of 60 patients. Data were analyzed using non-parametric statistical methods. The results demonstrate that there is no statistical difference between the two groups in seminal characteristics. The collective data show a high significant correlation, suggesting that spermatozoa with abnormal morphology are the best candidates to contain DNA damage (p < 0.001). Also, when group A is compared with group B, an increased percentage of morphologically normal spermatozoa with fragmented DNA was observed in patients, with DFI values ≥ 15% (p < 0.001). Conclusion These results are aimed at providing an exact value of DFI in morphologically normal spermatozoa, which will be helpful to the embryologist in evaluating the risk of transferring, during the ICSI procedure, a spermatozoon whit normal morphology but fragmented DNA.

scholarly journals Effects of Ficus syncomorus and Datura metel stem-bark extracts on the sperm characteristics of Yankasa rams

2020 ◽  
Vol 47 (2) ◽  
pp. 37-45
Author(s):  
J. O. Okpara ◽  
M. B Abudul ◽  
S. I Garba ◽  
O. V Adelowo ◽  
A. C Mbgojikwe
Keyword(s):  
Sperm Morphology ◽  
Stem Bark ◽  
Haematological Parameters ◽  
Group Iii ◽  
Datura Metel ◽  
Sperm Characteristics ◽  
Group I ◽  
Semen Volume ◽  
The Mean ◽  
Group Ii

Interest in medicinal plants for the management of myriad of conditions including reproductive disorders refractory to orthodox medicinal care is on the increase. Ficus syncomorus and Datura metel are two of such plants with folkloric evidence of aiding fertility in human. This study investigated the effect of aqueous stem-bark extracts (200 mg/kg) of F. syncomorus and D. metel respectively on the sperm characteristics of Yankasa rams. Twelve (12) matured (15 – 16 months) old rams were used in this study and randomly assigned into three (I, II, III) groups of four (4) animals each. Group I served as the control while II and III served as the treatment groups and received daily oral doses (200 mg/kg) of F. syncomorus and D. metel extracts respectively for 7 consecutive days. Semen was collected from all the groups at the end of the treatments using Electro-ejaculation method and evaluated by light microscopy. The mean semen volume (68.70+4.2 to 65.62+2.00) and percentage progressive motile cells significantly (p<0.05) reduced 7 days post treatment in group III (84.05+1.3) compared to the control (85.20+1.32) and the group II (86.56+0.40) animals. The mean sperm count, the percentage liveability and the haematological parameters and erythrocytic indices (10.81±0.24 for group 111 to 12.54±0.30 for group1) significantly (p<0.05) decreased in group III compared to the values in the control and group II rams. Abnormal sperm morphology (bent mid-piece, curved tail, headless tail, tailless head) significantly (p<0.05) increased in D. metel group (7.26+0.12) compared to F. syncomorus (5.02+0.04) and control groups (5.62+0.01) respectively. D. metel aquesous extract adversely affected sperm characteristics with significant effect on semen volume, sperm morphology and counts as well as haematological parameters. Exposure of animals to D. metel at the dose used may impair sperm fertilizing ability, thus leading to reduced ram fertility. While F. syncomorus extract appears a potential drug candidate for improving fertility.

Genetic Parameters for Testes Size and Sperm Number in Hereford Bulls

1982 ◽  
Vol 55 (5) ◽  
pp. 1033-1040 ◽  
Author(s):  
J. D. Neely ◽  
B. H. Johnson ◽  
E. U. Dillard ◽  
O. W. Robison
Keyword(s):  
Genetic Parameters ◽  
Sperm Number ◽  
Testes Size

Sperm morphology of the Rattini – are the interspecific differences due to variation in intensity of intermale sperm competition?

2018 ◽  
Vol 30 (11) ◽  
pp. 1434 ◽  
Author(s):  
Tessa Pahl ◽  
Hanna J. McLennan ◽  
Yun Wang ◽  
Anang S. Achmadi ◽  
Kevin C. Rowe ◽  
...  
Keyword(s):  
Sexual Selection ◽  
Sperm Competition ◽  
Sperm Morphology ◽  
Tail Length ◽  
Sperm Head ◽  
Apical Hook ◽  
Interspecific Differences ◽  
Murine Rodent ◽  
Murine Rodents ◽  
Sperm Size

It is widely accepted that in mammals a causal relationship exists between postcopulatory sexual selection and relative testes mass of the species concerned, but how much it determines sperm size and shape is debatable. Here we detailed for the largest murine rodent tribe, the Rattini, the interspecific differences in relative testes mass and sperm form. We found that residual testes mass correlates with sperm head apical hook length as well as its angle, together with tail length, and that within several lineages a few species have evolved highly divergent sperm morphology with a reduced or absent apical hook and shorter tail. Although most species have a relative testes mass of 1–4%, these derived sperm traits invariably co-occur in species with much smaller relative testes mass. We therefore suggest that high levels of intermale sperm competition maintain a sperm head with a long apical hook and long tail, whereas low levels of intermale sperm competition generally result in divergent sperm heads with a short or non-existent apical hook and shorter tail. We thus conclude that sexual selection is a major selective force in driving sperm head form and tail length in this large tribe of murine rodents.

scholarly journals The submissive chameleon: Third-party inferences from observing mimicry

2020 ◽  
Author(s):  
Oliver Genschow ◽  
Hans Alves
Keyword(s):  
Social Interactions ◽  
Impression Management ◽  
Person Perception ◽  
Response Pattern ◽  
Past Research ◽  
Social Consequences ◽  
Third Party ◽  
Interaction Partner ◽  
Social Phenomenon ◽  
Interaction Partners

Past research has shown that mimicry has a number of pro-social consequences for interaction partners. However, such research has almost exclusively focused on its effects among interaction dyads. As social interactions are often witnessed by third-party observers, the question arises which inferences perceivers draw from observing mimicry. In the present work, we apply a third-party perspective to mimicry and test whether observers perceive mimicking individuals as submissive. Experiment 1 confirmed our prediction and found that observers perceived a mimicking person as less dominant, and thus more submissive, than a mimicked person. Experiment 2 replicated this finding and ruled out possible demand effects. Experiment 3 showed that when an interaction partner does not mimic the movements initiated by another person, the interaction partner gains dominance in the eye of the observer. Experiment 4 demonstrates that the inferences that perceivers draw from observing mimicry partly rely on a mere action-response pattern. These findings have not only important implications for mimicry as a genuinely social phenomenon, but also for research on impression management and person perception.

Sperm morphology, motility and fertilisation capacity in the myobatrachid frog Crinia georgiana

2010 ◽  
Vol 22 (3) ◽  
pp. 516 ◽  
Author(s):  
Martin A. Dziminski ◽  
J. D. Roberts ◽  
Leigh W. Simmons
Keyword(s):  
Male Fertility ◽  
Sperm Morphology ◽  
Negative Relationship ◽  
Tail Length ◽  
Aquatic Organisms ◽  
Sperm Head ◽  
Swimming Velocity ◽  
Male Body ◽  
Sperm Viability ◽  
Sperm Traits

Sperm traits have been found to vary between individuals within populations in a variety of taxa. Sperm motility, morphometry and viability may be expected to have important effects on male fertility, although previous studies have found varying patterns, especially in external fertilisers. In the present study, we examined the effects of sperm swimming velocity, the proportion of motile spermatozoa, sperm head and tail length and the proportion of live spermatozoa on fertilisation success in the externally fertilising myobatrachid frog Crinia georgiana using IVF techniques and by controlling sperm numbers. We found no effect of any of the sperm traits we measured on IVF success. Neither did we find any relationship between sperm morphology and sperm performance. There was a negative relationship between sperm viability and male body size, which could be a function of age or an alternative tactic of differential investment in spermatozoa by smaller-sized males using sneak tactics in multiple matings. In contrast with most externally fertilising aquatic organisms, high rates of fertilisation appear to be achieved in C. georgiana with relatively low sperm swimming speeds.

scholarly journals The effects of Hoixuanhoan remedy on sperm number and sperm morphology in male with oligospermia

2015 ◽  
Vol 4 (1) ◽  
pp. 97
Author(s):  
Doan Minh Thuy ◽  
Truong Viet Binh ◽  
Thinh Nguyen The
Keyword(s):  
Sperm Morphology ◽  
Sperm Number
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