POCUS: Reproductive – Male

2021 ◽  
pp. 245-254
Author(s):  
Robert M. Fulton
Keyword(s):  
Reproductive Male

scholarly journals Non-reproductive male cane toads ( Rhinella marina ) withhold sex-identifying information from their rivals

2019 ◽  
Vol 15 (8) ◽  
pp. 20190462 ◽  
Author(s):  
Crystal Kelehear ◽  
Richard Shine
Keyword(s):  
Sexual Identity ◽  
Standardized Tests ◽  
Opportunity Cost ◽  
Cane Toad ◽  
Rhinella Marina ◽  
Secondary Sexual Characteristics ◽  
Sexual Characteristics ◽  
Reproductive Male ◽  
Male Specific ◽  
Do So

A male cane toad ( Rhinella marina ) that mistakenly clasps another male (rather than a female) in a sexual embrace (amplexus) can be induced to dismount by a male-specific ‘release call'. Although that sex-identifying system can benefit both males in that interaction, our standardized tests showed that one-third of male cane toads did not emit release calls when grasped. Most of those silent males were small, had small testes relative to body mass, and had poorly developed secondary sexual characteristics. If emitting a release call is costly (e.g. by attracting predators), a non-reproductive male may benefit by remaining silent; other cues (such as skin rugosity) will soon induce the amplexing male to dismount, and the ‘opportunity cost’ to being amplexed (inability to search for and clasp a female) is minimal for non-reproductive males. Hence, male toads may inform other males about their sexual identity only when it is beneficial to do so.

Exposure to non-kin females rapidly affects testicular morphology in non-reproductive male Damaraland mole-rats

2010 ◽  
pp. no-no
Author(s):  
P. A. Nice ◽  
P. A. Fleming ◽  
N. C. Bennett ◽  
P. W. Bateman ◽  
D. W. Miller
Keyword(s):  
Testicular Morphology ◽  
Reproductive Male

The Effect of Elevated Steroids Released by Reproductive Male Round Gobies, Neogobius melanostomus, on Olfactory Responses in Females

2011 ◽  
Vol 37 (3) ◽  
pp. 260-262 ◽  
Author(s):  
Alyson J. Laframboise ◽  
Yogesh Katare ◽  
Alexander P. Scott ◽  
Barbara S. Zielinski
Keyword(s):  
Neogobius Melanostomus ◽  
Olfactory Responses ◽  
Reproductive Male ◽  
Round Gobies

Reproductive female round gobies (Neogobius melanostomus) are attracted to visual male models at a nest rather than to olfactory stimuli in urine of reproductive males

Behaviour ◽  
2010 ◽  
Vol 147 (1) ◽  
pp. 121-132 ◽  
Author(s):  
Stan Yavno ◽  
Lynda Corkum
Keyword(s):  
Round Goby ◽  
Neogobius Melanostomus ◽  
Visual Signals ◽  
Invasive Fish ◽  
Reproductive Female ◽  
Olfactory Stimuli ◽  
Reproductive Male ◽  
Round Gobies ◽  
Male Model ◽  
Reproductive Females

AbstractFish are known to communicate in many ways and commonly use olfactory and visual signals. When round goby (Neogobius melanostomus) males become reproductive, they change from mottled grey to black and release sex steroids in their urine. In this study, we conducted a laboratory experiment to determine if reproductive female round gobies were attracted to a combination of olfactory (urine) and visual (silicone models) stimuli, representing reproductive and non-reproductive male round gobies. Females spent significantly more time at a nest with a black reproductive male model compared with a mottled non-reproductive male model. Neither urine type nor the interaction between model type and urine affected the time spent by reproductive females at a nest. Knowledge of the reproductive habits of the round goby may enable researchers to develop a method of species control for this invasive fish by manipulating its breeding habits.

Oxidative stress in the brain of reproductive male rats during aging

2011 ◽  
Vol 46 (4) ◽  
pp. 241-248 ◽  
Author(s):  
Paulo Vinicius Gil Alabarse ◽  
Fernanda Schäfer Hackenhaar ◽  
Tássia Machado Medeiros ◽  
Marcus Fabiano Almeida Mendes ◽  
Paula Ramos Viacava ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Male Rats ◽  
Reproductive Male ◽  
The Brain

Differential female preference for individual components of a reproductive male round goby (Neogobius melanostomus) pheromone

2017 ◽  
Vol 43 (2) ◽  
pp. 379-386 ◽  
Author(s):  
M. Farwell ◽  
G. Hughes ◽  
J.L. Smith ◽  
E. Clelland ◽  
S.J. Loeb ◽  
...  
Keyword(s):  
Round Goby ◽  
Female Preference ◽  
Neogobius Melanostomus ◽  
Reproductive Male

Oligospermia and azoospermia in non-reproductive male Damaraland mole-ratsCryptomys damarensis(Rodentia: Bathyergidae)

1999 ◽  
Vol 248 (3) ◽  
pp. 411-418 ◽  
Author(s):  
K. A. Maswanganye ◽  
N. C. Bennett ◽  
J. Brinders ◽  
R. Cooney
Keyword(s):  
Reproductive Male

scholarly journals Male-mediated maturation in a wild primate

2020 ◽  
Author(s):  
Amy Lu ◽  
Jacob A. Feder ◽  
Noah Snyder-Mackler ◽  
Thore J. Bergman ◽  
Jacinta C. Beehner
Keyword(s):  
Head Start ◽  
Fetal Loss ◽  
Father Absence ◽  
Early Puberty ◽  
Immature Female ◽  
Father Presence ◽  
Bruce Effect ◽  
First Case ◽  
Reproductive Male ◽  
Alternative Scenarios

AbstractIn humans, a controversial hypothesis suggests that father absence promotes early puberty in daughters. Data from rodents confirm females accelerate maturation with exposure to novel males (“Vandenbergh effect”) and delay it with exposure to male relatives. Here, we report the first case of male-mediated maturation in a wild primate, geladas (Theropithecus gelada). Females were more likely to mature after a change in the reproductive male: some matured earlier than expected (Vandenbergh effect) and some later (due to father presence). Novel males stimulated a surge in estrogens for all immature females - even females too young to mature. Although male-mediated puberty accelerated first births, the effect was modest, suggesting that alternative scenarios, such as co-evolution with the Bruce effect (male-mediated fetal loss) may explain this phenomenon.One Sentence SummaryNovel males induce an estrogen surge, male-mediated puberty, and a head-start on reproduction for immature female geladas.

scholarly journals Protogyny in a tropical damselfish: females queue for future benefit

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2198 ◽  
Author(s):  
Mark I. McCormick
Keyword(s):  
Dominance Hierarchy ◽  
Nest Site ◽  
Group Living ◽  
Trade Offs ◽  
Pomacentrus Amboinensis ◽  
Reproductive Male ◽  
The Cost ◽  
Removal Studies ◽  
Linear Dominance Hierarchy

Membership of the group is a balance between the benefits associated with group living and the cost of socially constrained growth and breeding opportunities, but the costs and benefits are seldom examined. The goal of the present study was to explore the trade-offs associated with group living for a sex-changing, potentially protogynous coral reef fish, the Ambon damselfish,Pomacentrus amboinensis. Extensive sampling showed that the species exhibits resource defence polygyny, where dominant males guard a nest site that is visited by females.P. amboinensishave a longevity of about 6.5 years on the northern Great Barrier Reef. While the species can change sex consistent with being a protogynous hermaphrodite, it is unclear the extent to which the species uses this capability. Social groups are comprised of one reproductive male, 1–7 females and a number of juveniles. Females live in a linear dominance hierarchy, with the male being more aggressive to the beta-female than the alpha-female, who exhibits lower levels of ovarian cortisol. Surveys and a tagging study indicated that groups were stable for at least three months. A passive integrated transponder tag study showed that males spawn with females from their own group, but also females from neighbouring groups.In situbehavioural observations found that alpha-females have priority of access to the nest site that the male guarded, and access to higher quality foraging areas. Male removal studies suggest that the alpha-females can change sex to take over from the male when the position becomes available. Examination of otolith microstructure showed that those individuals which change sex to males have different embryonic characteristics at hatching, suggesting that success may involve a component that is parentally endowed. The relative importance of parental effects and social organisation in affecting the importance of female queuing is yet to be studied, but will likely depend on the strength of social control by the dominant members of the group.

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