Results 81 to 90 of about 19,844 (294)
تاکسونومی و بیوسیستماتیک, 2013 In this research, the variation of spermatozoa traits among three male rainbow trout (Oncorhynchus mykiss) was used to examine how the relative influences of sperm density and duration of sperm motility account for sperm competition success.
Hossein Moradyan +3 more
doaj
Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish. [PDF]
PLoS ONE, 2012 In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates (pre-copulatory sexual selection) and ability of their ejaculates to outcompete those of other males (post-copulatory sexual ...
Paolo Galeotti +5 more
doaj +1 more source
Equine Veterinary Journal, EarlyView.Abstract Background Persistent breeding‐induced endometritis (PBIE) is a common reason for mares failing to establish pregnancy. Objective To examine the hypothesis that advancing mare age and embryo donor status predispose to PBIE and compromise fertility.
Tom Stout +3 more
wiley +1 more source
Sexual selection and the evolution of brain size in primates.
PLoS ONE, 2006 Reproductive competition among males has long been considered a powerful force in the evolution of primates. The evolution of brain size and complexity in the Order Primates has been widely regarded as the hallmark of primate evolutionary history ...
Michael A Schillaci
doaj +1 more source
COMP-1 promotes competitive advantage of nematode sperm
eLife, 2015 Competition among sperm to fertilize oocytes is a ubiquitous feature of sexual reproduction as well as a profoundly important aspect of sexual selection.
Jody M Hansen +2 more
doaj +1 more source
Journal of Periodontology, EarlyView.Abstract Background This study investigates the impact of disruptions in testosterone levels on bone remodeling, root resorption, and periodontal ligament (PDL) during orthodontic tooth movement (OTM) in a pubertal male rat model. Methods Testosterone deficiency was induced through orchiectomy, and the anabolic‐androgenic steroid (AAS, testosterone ...
Caio Luiz Bitencourt Reis +11 more
wiley +1 more source
, 2013 Cordes N, Yiğit A, Engqvist L, Schmoll T. Differential sperm expenditure reveals a possible role for post-copulatory sexual selection in a lekking moth. Ecology and Evolution.
Yiğit, Arzu +7 more
core +1 more source
Rhyming in the cold: first evidence of soniferous fishes in the Southern Ocean
Remote Sensing in Ecology and Conservation, EarlyView.The acoustic ecology of Southern Ocean fishes remains unknown due to a lack of dedicated acoustic research on the fishes of this ocean. Passive acoustic monitoring data were collected at the South African sub‐Antarctic Prince Edward Islands using an underwater acoustic recorder, and towed underwater Ski‐Monkey cameras were deployed to identify fish ...
Fannie W. Shabangu +5 more
wiley +1 more source
La compétition spermatique chez les insectes: les stratégies d'assurance de la paternité et la préséance du sperme [PDF]
Biotechnologie, Agronomie, Société et Environnement, 1999 Sperm competition in insects: paternity assurance and sperm precedence. The prediction that insects, as a result of polyandry, extreme sperm longevity within the female and high efficiency of sperm utilisation at fertilisation, are preadapted to sustain ...
Arnaud L.
doaj
Sperm competition in grey whales
Nature, 1988 SIR-Your legend for the drawing of grey whales taken from Cyall Watson's book Whales of the World, perpetuates the myth that a 'helper' male is necessary for successful mating in this species. The legend states that: "Only one male is involved in the actual mating; the other takes an upright position on the far side of the female, acting as a prop or ...
Ralls, Katherine +1 more
openaire +3 more sources