Subspecific variation in sperm morphology and performance in the Long-tailed Finch (Poephila acuticauda) DOI Creative Commons
Melissah Rowe, Simon C. Griffith,

Antje Hofgaard

et al.

Avian Research, Journal Year: 2015, Volume and Issue: 6(1)

Published: Dec. 1, 2015

Evolutionary biology endeavours to explain biological diversity, and as such it is critical develop an understanding of the adaptive functional significance trait variation. Spermatozoa exhibit remarkable levels morphological diversification. However, our evolutionary causes this variation limited, especially at intraspecific level. We quantified in sperm morphology performance between two subspecies Long-tailed Finch (Poephila acuticauda P. a. hecki), a small grassfinch found tropical northern Australia. Despite zone secondary contact, these are maintained distinct forms: occurs western part species' range has yellow bill, while hecki exhibits red bill eastern range. small, but significant differences size (P. had longer narrower than which was surprising given recent origins taxa (i.e. 0.3 million years ago). Additionally, both exhibited high values between- within-male morphology, though case midpiece length significantly lower relative hecki. suggest observed result genetic drift reflect historical processes associated with divergence populations subspecies. Finally, we discuss potential implications findings for process population reproductive isolation.

Language: Английский

COSTLY INFIDELITY: LOW LIFETIME FITNESS OF EXTRA-PAIR OFFSPRING IN A PASSERINE BIRD DOI
Yu‐Hsun Hsu, Julia Schroeder, Isabel S. Winney

et al.

Evolution, Journal Year: 2014, Volume and Issue: 68(10), P. 2873 - 2884

Published: June 16, 2014

Extra-pair copulation (EPC) is widespread in socially monogamous species, but its evolutionary benefits remain controversial. Indirect genetic benefit hypotheses postulate that females engage EPC to produce higher quality extra-pair offspring (EPO) than within-pair (WPO). In contrast, the sexual conflict hypothesis posits beneficial males not females. Thus, under hypothesis, EPO are predicted be no fitter WPO. We tested these two a 12-year dataset with complete life-history and pedigree information from an isolated island population of house sparrows (Passer domesticus). compared fitness components types WPO: (1) WPO genetically polyandrous "unfaithful" mothers, (2) mothers. found all three groups had similar probabilities hatching nestling survival. Unexpectedly, lowest probability recruiting into breeding lifetime reproductive output. Our results indicate incurred indirect costs, rather benefits, which contrary models. Importantly, costs we observed also underappreciated current call for improved theoretical frameworks incorporate by extending

Language: Английский

Citations

58
Assessing the potential for post‐copulatory sexual selection in elasmobranchs DOI
John L. Fitzpatrick, Ryan M. Kempster, Toby S. Daly‐Engel

et al.

Journal of Fish Biology, Journal Year: 2012, Volume and Issue: 80(5), P. 1141 - 1158

Published: March 20, 2012

This review highlights the potential role that post‐copulatory sexual selection plays in elasmobranch reproductive systems and utility of this group to further understanding evolutionary responses processes sperm competition cryptic female choice. The growing genetic evidence for multiple mating (polyandry) elasmobranchs is summarized. While polyandry appears be common group, rates paternity are highly variable between species suggesting there large variance strength among elasmobranchs. Possible adaptations traits important then considered. Particular emphasis devoted explore choice influence evolution testes size, morphology, genital morphology storage organs. Finally, it argued future work should take advantage wealth information on these already available gain a better how operates group.

Language: Английский

Citations

54
Sperm morphology, adenosine triphosphate (ATP) concentration and swimming velocity: unexpected relationships in a passerine bird DOI Creative Commons

Clair Bennison,

Nicola Hemmings, Lola Brookes

et al.

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2016, Volume and Issue: 283(1837), P. 20161558 - 20161558

Published: Aug. 24, 2016

The relationship between sperm energetics and function is poorly known, but central to our understanding of the evolution traits. aim this study was examine how morphology ATP content affect swimming velocity in zebra finch Taeniopygia guttata . We exploited high inter-male variation species created extra experimental power by increasing number individuals with very long or short through artificial selection. found a pronounced quadratic total length velocity, up point, declining longest sperm. also an unexpected negative association midpiece content: generally contained highest concentration ATP. Low intracellular therefore unlikely explain reduced among (which tend have shorter midpiece).

Language: Английский

Citations

45
Sperm competition in squamate reptiles DOI Open Access
Christopher R. Friesen, Ariel F. Kahrl, Mats Olsson

et al.

Philosophical Transactions of the Royal Society B Biological Sciences, Journal Year: 2020, Volume and Issue: 375(1813), P. 20200079 - 20200079

Published: Oct. 18, 2020

Multiple paternity is ubiquitous within the polyphyletic group called ‘reptiles', especially lizards and snakes. Therefore, probability of sperm competition occurring, being intense, high. Squamates exhibit a diversity tactics to ensure fertilization success in face competition. The duration female storage, which can be many months even years some species, remains an enigma. Here, we emphasize mechanisms that might affect patterns paternity, source function ejaculates features reproductive tract may aid long-term storage. In doing so, present new analysis relationship between size, strength Lizards snakes are diverse has provided excellent models for study array life-history strategies. However, when it comes postcopulatory sexual selection, there much left discover. This article part theme issue ‘Fifty competition'.

Language: Английский

Citations

35
Maintenance of Sperm Variation in a Highly Promiscuous Wild Bird DOI Creative Commons
Sara Calhim, Michael C. Double, Nicolas Margraf

et al.

PLoS ONE, Journal Year: 2011, Volume and Issue: 6(12), P. e28809 - e28809

Published: Dec. 15, 2011

Postcopulatory sexual selection is an important force in the evolution of reproductive traits, including sperm morphology. In birds, morphology known to be highly heritable and largely condition-independent. Theory predicts, recent comparative work corroborates, that strong such traits reduces intraspecific phenotypic variation. Here we show some variation can maintained despite extreme promiscuity, as a result opposing, copulation-role-specific forces. After controlling for correlates siring success superb fairy-wren (Malurus cyaneus), found (a) lifetime extra-pair paternity was associated with shorter flagellum relatively large head, (b) males whose had longer smaller head achieved higher within-pair paternity. this species extrapair copulations occur same morning, but preceding, pair during female's fertile period, suggesting larger-headed are most successful securing storage (defense), whereas opposite phenotype might better at outcompeting stored (offense). Furthermore, since cuckolding ability major contributor differential male output, stronger on defense competition explain short malurids relative other promiscuous passerines.

Language: Английский

Citations

47
Evolution of sperm morphology in anurans: insights into the roles of mating system and spawning location DOI Creative Commons
Yu Zeng, Shang Ling Lou, Wen Bo Liao

et al.

BMC Evolutionary Biology, Journal Year: 2014, Volume and Issue: 14(1)

Published: May 15, 2014

The degree of postcopulatory sexual selection, comprising variable degrees sperm competition and cryptic female choice, is an important evolutionary force to influence form function. Here we investigated the effects mating system spawning location on evolution morphology in 67 species Chinese anurans. We also examined how relative testes size as indicator level affected variation across a subset 29 species. found significant association with morphology. However, when removing body mass or absolute for which such data were available, this effect became non-significant. Consistent predictions from theory, positive correlation between after taking phylogeny into account. Our findings suggest that selection anurans favors longer high. Pre-copulatory male-male location, other hand, do not affect

Language: Английский

Citations

37
Sperm motility parameters forSteindachneridion parahybaebased on open-source software DOI Open Access
Eduardo Antônio Sanches,

Ronan Maciel Marcos,

Renan Yoshiharu Okawara

et al.

Journal of Applied Ichthyology, Journal Year: 2013, Volume and Issue: 29(5), P. 1114 - 1122

Published: March 15, 2013

The objective of this work was to evaluate the sperm motility 13 Steindachneridion parahybae males using open-source software (ImageJ/CASA plugin). activation procedure and image capture were initiated after semen collection. Four experimental phases defined from videos captured each male as follows: (i) standardization a dialogue box generated by CASA plugin within ImageJ; (ii) frame numbers used perform analysis; (iii) post-activation between 10 20 s with analysis at 1 s; (iv) 50 s. settings in satisfactory, results consistent. These analyses should be performed frames immediately because spermatozoa quickly lose their vigor. At post-activation, 89.1% motile observed 107.2 μm s−1 curvilinear velocity, 83.6 average path 77.1 straight line velocity; 91.6% straightness 77.1% wobble. ImageJ can applied study species established settings.

Language: Английский

Citations

34
Sperm length variation in House Wrens Troglodytes aedon DOI
Emily R. A. Cramer,

Terje Laskemoen,

Oddmund Kleven

et al.

Journal of Ornithology, Journal Year: 2012, Volume and Issue: 154(1), P. 129 - 138

Published: July 19, 2012

Language: Английский

Citations

33
Modification of sperm morphology during long-term sperm storage in the reproductive tract of the Chinese soft-shelled turtle, Pelodiscus sinensis DOI Creative Commons
Linli Zhang, Ping Yang, Xunguang Bian

et al.

Scientific Reports, Journal Year: 2015, Volume and Issue: 5(1)

Published: Nov. 5, 2015

Sperm storage in vivo extends the time window for fertilisation several animal species, from a few days to years. The underlying mechanisms, however, are largely unknown. In this study, spermatozoa epididymis and oviduct of Chinese soft-shelled turtles were investigated identify potentially relevant morphological features transformations at different stages sperm storage. Large cytoplasmic droplets (CDs) containing lipid (LDs) attached midpiece most epididymis, without migrating down tail. However, they absent oviductal spermatozoa, suggesting that CDs with LDs may be source endogenous energy epididymal spermatozoa. onion-like mitochondria recovered their double-membrane morphology, typical cristae, within later stage storage, thus implying mitochondrial metabolism undergoes alterations during Furthermore, well developed fibrous sheath on long principal piece was integrating ultrastructure glycolytic enzymes substrates. These novel characteristics allow turtle use diverse pathways

Language: Английский

Citations

29
Methodological considerations for examining the relationship between sperm morphology and motility DOI Creative Commons
Kristin A. Hook, Heidi S. Fisher

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

Citations

27