Variation in sperm morphometry and sperm competition among barn swallow (Hirundo rustica) populations

Behavioral Ecology and Sociobiology, Journal Year: 2012, Volume and Issue: 67(2), P. 301 - 309

Published: Nov. 17, 2012

Language: Английский

---

Physically Challenging Song Traits, Male Quality, and Reproductive Success in House Wrens

PLoS ONE, Journal Year: 2013, Volume and Issue: 8(3), P. e59208 - e59208

Published: March 19, 2013

Physically challenging signals are likely to honestly indicate signaler quality. In trilled bird song two physically parameters vocal deviation (the speed of sound frequency modulation) and trill consistency (how precisely syllables repeated). As predicted, in several species, they correlate with male quality, preferred by females, and/or function male-male signaling. Species may experience different selective pressures on their songs, however; for instance, there be opposing selection between complexity performance difficulty, such that species where is strongly selected, not strong performance-based traits. I tested whether quality house wrens (Troglodytes aedon), a complex structure. Males' singing ability did except older males sang higher consistency, more consistent trills responded aggressively playback (although previous study found no effect stimulus males' responses playback). Males songs gain polygyny, extra-pair paternity, or annual reproductive success. Moreover, none the standard measures investigated correlated mating conclude do signal this species.

Language: Английский

---

Altitude underlies variation in the mating system, somatic condition, and investment in reproductive traits in male Asian grass frogs (Fejervarya limnocharis)

Behavioral Ecology and Sociobiology, Journal Year: 2016, Volume and Issue: 70(8), P. 1197 - 1208

Published: April 30, 2016

Language: Английский

---

Environmentally induced (co)variance in sperm and offspring phenotypes as a source of epigenetic effects

Journal of Experimental Biology, Journal Year: 2015, Volume and Issue: 218(1), P. 107 - 113

Published: Jan. 1, 2015

Traditionally, it has been assumed that sperm are a vehicle for genes and nothing more. As such, the only source of variance in offspring phenotype via paternal line genetic effects. More recently, however, shown or environment fathers can affect offspring, challenging traditional theory with implications evolution, ecology human vitro fertilisation. Here, I review sources non-genetic variation evidence co-variation between phenotypes. distinguish two environmental phenotype: pre-release post-release environment. Pre-release, phenotypes vary within species according to male (e.g. body size) local conditions such as threat competition. Post-release, physicochemical experience, either when freely spawned released into female reproductive tract, further filter modify find both pre- environments phenotype; fertilisation is not new beginning – rather, experiences father upon release drive offspring. Interestingly, there was some stress resistance though more studies needed determine whether effects widespread. Overall, appears environmentally induced covariation non-negligible work their prevalence strength.

Language: Английский

---

Rapid sperm evolution in the bluethroat (Luscinia svecica) subspecies complex

Behavioral Ecology and Sociobiology, Journal Year: 2013, Volume and Issue: 67(8), P. 1205 - 1217

Published: May 10, 2013

Language: Английский

---

Methodological considerations for examining the relationship between sperm morphology and motility

Molecular Reproduction and Development, Journal Year: 2020, Volume and Issue: 87(6), P. 633 - 649

Published: May 16, 2020

Abstract Sperm cells of all taxa share a common goal to reach and fertilize an ovum, yet sperm are one the most diverse cell types in nature. While structural diversity these is well recognized, functional significance variation design remains elusive. An important function spermatozoa need migrate toward ova, often over long distances foreign environment, which may include complex hostile female reproductive tract. Several comparative experimental studies have attempted address link between morphology motility, conclusions drawn from inconsistent, even within same taxa. Much what we know about internally fertilizing species has been gleaned vitro studies, for parameters vary among studies. We propose that discordant results part due lack consistency methods, conditions do not replicate those tract, overuse simple linear measures shape. Within this review, provide toolkit imaging, quantifying, analyzing movement patterns discuss emerging approaches. Results linking motility enhance our understanding evolution adaptive traits mechanisms regulate fertility, thus offering new insights into methods used assisted technologies animal science, conservation public health.

Language: Английский

---

Seasonal variation in ejaculate traits of male red-winged blackbirds (Agelaius phoeniceus)

Behavioral Ecology and Sociobiology, Journal Year: 2012, Volume and Issue: 66(12), P. 1607 - 1617

Published: Sept. 22, 2012

Language: Английский

---

Morphology‐function relationships and repeatability in the sperm of Passer sparrows

Journal of Morphology, Journal Year: 2014, Volume and Issue: 276(4), P. 370 - 377

Published: Nov. 26, 2014

ABSTRACT Sperm performance is likely to be an important determinant of male reproductive success, especially when females copulate with multiple males. Understanding sperm therefore crucial fully understand the evolution strategies. In this study, we examined repeatability morphology and motility measures over three breeding seasons, studied relationships between function. We conducted study in wild‐derived captive house sparrows ( Passer domesticus ) Spanish P. hispaniolensis ). Results for two species were similar. As predicted from results other passerine species, total length was highly repeatable across ejaculates, components moderate. The swimming speed ejaculates lower, but statistically significant, suggesting that velocity may a relatively dynamic trait. Surprisingly, did not correlate relative midpiece, it correlated negatively flagellum length. This pattern opposite what theory predicts differs has been found before. Also contrary previous work, no evidence correlates longevity. These highlight need better understanding function birds. J. Morphol. 276:370–377, 2015. © 2014 Wiley Periodicals, Inc.

Language: Английский

---

Variability in sperm form and function in the context of sperm competition risk in two Tupinambis lizards

Ecology and Evolution, Journal Year: 2014, Volume and Issue: 4(21), P. 4080 - 4092

Published: Oct. 7, 2014

Abstract In polyandrous species, sperm morphometry and velocity are under strong sexual selection. Although several hypotheses have been proposed to explain the role of competition in trait variation, this aspect is still poorly understood. It has suggested that an increase pressure could reduce size variation or produce a diversity maximize male fertilization success. We aim at elucidating variability morphometric traits two Tupinambis lizards context risk. Sperm showed substantial all levels examined: between among males within ejaculate individual males. was found be positively correlated with flagellum: midpiece ratio, relatively longer flagella associated faster sperm. Our results document high form function lizards.

Language: Английский

---

Male age and its association with reproductive traits in captive and wild house sparrows

Journal of Evolutionary Biology, Journal Year: 2019, Volume and Issue: 32(12), P. 1432 - 1443

Published: Sept. 17, 2019

Abstract Evolutionary theory predicts that females seek extra‐pair fertilizations from high‐quality males. In socially monogamous bird species, it is often old males are most successful in fertilizations. Adaptive models of female mate choice suggest may produce offspring higher genetic quality than young because they have proven their survivability. However, also more likely to show signs reproductive senescence, such as reduced sperm quality. To better understand why account for a disproportionally large number and what the consequences mating with are, we compared several traits both captive wild house sparrows, Passer domesticus . Sperm morphological cloacal protuberance volume (a proxy load) did not differ substantially. delivered almost three times female's egg We discuss possibility post‐copulatory advantage over mated

Language: Английский

---