Results 131 to 140 of about 1,124,248 (284)

Increased male investment in sperm competition results in reduced maintenance of gametes. [PDF]

PLoS Biol, 2023
Koppik M, Baur J, Berger D.
europepmc   +1 more source

Early‐Life Telomere Length Negatively Covaries With Brood Size and Father Age, and Predicts Long‐Term Survival in Male Barn Swallows (Hirundo rustica)

Integrative Zoology, EarlyView.
In barn swallows, nestlings raised in larger broods or by older social fathers have shorter telomeres, and those with longer telomeres tend to live longer, suggesting that early‐life conditions may shape individual lifespan through telomere dynamics. ABSTRACT Parental decisions on breeding, such as brood size and timing of reproduction, influence the ...
Andrea Novelli, Manuela Caprioli, Roberto Ambrosini, Alessandra Costanzo, Diego Rubolini, Marco Parolini, Andrea Romano   +6 more
wiley   +1 more source

Differences in sperm morphology between Alouatta palliata and Alouatta pigra are consistent with the intensity of sperm competition in each species. [PDF]

Am J Primatol, 2023
Hirst MA, Rodas-Martínez AZ, Milich KM, Cortés-Ortiz L.   +3 more
europepmc   +1 more source

Sperm competition and fertilization success.

, 2009
AbstractMuch of our understanding of the reproductive physiology of birds is derived from research by poultry biologists. Starting in the 1970s behavioural ecologists began to explore the evolutionary consequences of female promiscuity across a range of taxa, but mainly insects and birds, focusing on the fact that, if females copulate with two or more ...
Birkhead, T, Pizzari, T
openaire   +1 more source

After All, Size Does Matter: Size and Trachemys Scripta Reproduction Traits at the Western Limit of Its European Distribution

Integrative Zoology, EarlyView.
‐ Female T. scripta exhibit a clear size‐dependent reproductive investment, where larger plastron length is positively associated with all key reproductive traits. ‐ Female T. scripta reach sexual maturity at a plastron length of approximately 15–18 cm. ABSTRACT In invasive species, reproductive success may determine invasion outcomes and influence the
João Rato, Shaquille Matthys, Pedro Brandão, Olivia Hartmann, Stefano Canessa, Pedro Anastácio, Filipe Banha   +6 more
wiley   +1 more source

Male alternative reproductive tactics and sperm competition: a meta-analysis. [PDF]

Biol Rev Camb Philos Soc, 2022
Dougherty LR, Skirrow MJA, Jennions MD, Simmons LW.   +3 more
europepmc   +1 more source

The evolution of large testes: Sperm competition or male mating rate?

, 2011
A positive relationship across species between the extent to which females mate with more than one male and relative testes mass has been demonstrated in a wide range of vertebrate taxa and certain insects.
Parker, Darren James, Vahed, Karim, Parker, Darren J.   +2 more
core   +1 more source

Maximizing eDNA detections of rare marine organisms: A case study of a delphinid species

Methods in Ecology and Evolution, EarlyView.
Abstract Environmental DNA (eDNA) is an emerging tool for surveying marine organisms. Advances in molecular assay designs and bioinformatic methods provide new opportunities for detecting rare species; however, overcoming methodological challenges of rare species detection remains an important obstacle for the widespread deployment of eDNA methods for ...
Nastassia V. Patin, Eiren K. Jacobson, Zachary Gold, Amy M. Van Cise, Julie Dinasquet, Bryce Ellman, Robert H. Lampe, Anne Schulberg, Noelle Bowlin, Ryan Freedman, Erin Satterthwaite, Andrew E. Allen, Brice X. Semmens   +12 more
wiley   +1 more source

Ranking parameters driving siring success during sperm competition in the North African houbara bustard. [PDF]

Commun Biol, 2023
Sorci G, Hussein HA, Levêque G, Saint Jalme M, Lacroix F, Hingrat Y, Lesobre L.   +6 more
europepmc   +1 more source

Semen quality in patients with testicular cancer is associated with age and with greatly elevated levels of beta human chorionic gonadotropin

Andrology, EarlyView.
Abstract Background Poor semen quality is a well‐known feature in patients with testicular germ cell tumours (GCTs) at the time of diagnosis but the underlying biological reasons are incompletely understood. Objectives This study aimed to identify GCT‐specific clinical factors that are involved with poor semen quality in GCT patients.
Klaus‐Peter Dieckmann, Johanna Hochmuth‐Tisch, Andrea Salzbrunn, Cord Matthies, Kathrein von Kopylow, Marta Godlewska, Christian Wülfing, Uwe Pichlmeier, Armin Soave, Christian Guido Ruf   +9 more
wiley   +1 more source