UNUSUAL SPERM MORPHOLOGY IN THE EURASIAN BULLFINCH (PYRRHULA PYRRHULA)

The Auk ◽  
2006 ◽  
Vol 123 (2) ◽  
pp. 383 ◽  
Author(s):  
Timothy R. Birkhead ◽  
Simone Immler ◽  
E. Jayne Pellatt ◽  
Robert Freckleton
Keyword(s):  
Sperm Morphology ◽  
Pyrrhula Pyrrhula

scholarly journals The Azores bullfinch (Pyrrhula murina) has the same unusual and size-variable sperm morphology as the Eurasian bullfinch (Pyrrhula pyrrhula)

2013 ◽  
Vol 108 (3) ◽  
pp. 677-687 ◽  
Author(s):  
Jan T. Lifjeld ◽  
Antje Hoenen ◽  
Lars Erik Johannessen ◽  
Terje Laskemoen ◽  
Ricardo J. Lopes ◽  
...  
Keyword(s):  
Sperm Morphology ◽  
Size Variable ◽  
Pyrrhula Pyrrhula

scholarly journals Unusual Sperm Morphology in the Eurasian Bullfinch (Pyrrhula Pyrrhula)

The Auk ◽  
2006 ◽  
Vol 123 (2) ◽  
pp. 383-392 ◽  
Author(s):  
Timothy R. Birkhead ◽  
Simone Immler ◽  
E. Jayne Pellatt ◽  
Robert Freckleton
Keyword(s):  
Principal Component Analysis ◽  
Body Size ◽  
Sperm Competition ◽  
Sperm Morphology ◽  
Principal Component ◽  
Component Analysis ◽  
Sperm Head ◽  
The Other ◽  
Relaxed Selection ◽  
Pyrrhula Pyrrhula

Abstract The sperm of the Eurasian Bullfinch (Pyrrhula pyrrhula) differs markedly in gross morphology from that of all other passerines examined to date. In other passerines, the sperm head is pointed and helical, and the midpiece comprises a mitochondrial helix extending along the flagellum; whereas in the Eurasian Bullfinch, the sperm acrosome is rounded, not helical, and the midpiece is extremely short. In a pairwise study, using principal component analysis (PCA), we combined quantitative and qualitative sperm morphology traits and conducted a phylogenetic correlation to compare the sperm morphology of Eurasian Bullfinch and Beavan's Bullfinch (P. erythaca) with nine other pairs of congeneric passerines. The analysis revealed that Eurasian Bullfinch was a dramatic outlier in sperm morphology and that Eurasian and Beavan's bullfinches are more different than any other pair of species. Excluding Eurasian Bullfinch from the analysis showed that most variation in sperm morphology in the other species was attributable to phylogeny. The Eurasian Bullfinch also has extremely small testes for its body size, which indicates that sperm competition is infrequent in this species; we discuss the possibility that relaxed selection, via lack of sperm competition, may have contributed to the species' unusual sperm morphology. Morfología Espermática Inusual en Pyrrhula pyrrhula

The Unusual Sperm Morphology of the Eurasian Bullfinch (Pyrrhula pyrrhula) is not Due to the Phenotypic Result of Genetic Reduction

The Auk ◽  
2010 ◽  
Vol 127 (4) ◽  
pp. 832-840 ◽  
Author(s):  
Kate L. Durrant ◽  
Deborah A. Dawson ◽  
Terry Burke ◽  
Tim R. Birkhead
Keyword(s):  
Sperm Morphology ◽  
Pyrrhula Pyrrhula

119: Effect of Epididymitis on Semen Biochemical and Sperm Morphology Parameters

2005 ◽  
Vol 173 (4S) ◽  
pp. 32-32
Author(s):  
Petra Huwe ◽  
Roelof Menkveld ◽  
Martin Ludwig ◽  
Wolfgang Weidner
Keyword(s):  
Sperm Morphology ◽  
Morphology Parameters

Molecular basis of adaptive evolution of sperm motility involved in in vivo fertilization of terrestrial animals

Impact ◽  
2020 ◽  
Vol 2020 (6) ◽  
pp. 73-75
Author(s):  
Akihiko Watanabe
Keyword(s):  
Sexual Reproduction ◽  
Sperm Motility ◽  
Asexual Reproduction ◽  
Acrosome Reaction ◽  
Sperm Morphology ◽  
Adaptive Potential ◽  
Selective Pressures ◽  
The Face ◽  
Genetic Profiles

One of the unifying traits of life on this planet is reproduction, or life's ability to make copies of itself. The mode of reproduction has evolved over time, having almost certainly begun with simple asexual reproduction when the ancestral single celled organism divided into two. Since these beginnings' life has tried out numerous strategies, and perhaps one of the most important and successful has been sexual reproduction. This form of reproduction relies on the union of gametes, otherwise known as sperm and egg. Evolutionarily, sexual reproduction allows for greater adaptive potential because the genes of two unique individuals have a chance to recombine and mix in order to produce a new individual. Unlike asexual reproduction which produces genetically-identical clones of the parent individual, sex produces offspring with novel genes and combinations of genes. Therefore, in the face of new selective pressures there is a higher chance that one of these novel genetic profiles will produce an adaptation that is advantageous in the new circumstances. Dr Akihiko Watanabe is a reproductive biologist based in the Department of Biology, Faculty of Science Yamagata University in Japan, he is currently working on three research projects; a comparative study on the signalling pathways for inducing sperm motility and acrosome reaction in amphibians, the mechanism behind the adaptive modification of sperm morphology and motility, and the origin of sperm motility initiating substance (SMIS).

scholarly journals Expression of Apoptosis-Related Genes in Cat Testicular Tissue in Relation to Sperm Morphology and Seasonality—A Preliminary Study

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 489
Author(s):  
Sylwia Prochowska ◽  
Agnieszka Partyka ◽  
Wojciech Niżański
Keyword(s):  
Sperm Morphology ◽  
Semen Quality ◽  
Testicular Tissue ◽  
Reproductive Season ◽  
Tissue Samples ◽  
Protein Levels ◽  
Expression Of Genes ◽  
Testicular Regression ◽  
Preliminary Study ◽  
Apoptotic Genes

Apoptosis is a crucial process in spermatogenesis, responsible for the elimination of abnormal sperm cells and testicular regression out of breeding season. The aim of this study was to assess if the expression of apoptosis-related genes in testicular tissue of domestic cats differed: (1) between normozoospermic and teratozoospermic donors, and (2) between reproductive and non-reproductive season. The expression of genes: BCL2L1, BCL2, BAX, BAD, FAS, FASLG, and caspases (CASP3, CASP8, CASP9, and CASP10) was analyzed by qRT-PCR in testicular tissue samples. During non-reproductive season significantly higher expression of two anti-apoptotic genes (BCL2L1 and BCL2) was observed. Additionally, there was a significant higher expression of CASP10 in teratozoospermic cats during non-reproductive than during reproductive season. No differences were noted between normozoospermic and teratozoospermic groups. Upregulation of some genes during the non-reproductive season indicates engagement of apoptotic mechanisms in the seasonal changes of semen quality in cats, however further studies on protein levels and analysis of changes on distinct testicular germinal layers are required. At the same time, teratozoospermia in the general population of cats seems to be not connected with dysregulation of apoptosis in the testes.

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