Swarming Behavior, Sexual Dimorphism, and Female Reproductive Status in the Sex Role-Reversed Dance Fly Species Rhamphomyia marginata

1997 ◽  
Vol 10 (6) ◽  
pp. 783-804 ◽  
Author(s):  
Bo G. Svensson
Keyword(s):  
Sexual Dimorphism ◽  
Sex Role ◽  
Reproductive Status ◽  
Female Reproductive Status ◽  
Swarming Behavior ◽  
Dance Fly

scholarly journals Sex-biased immunity is driven by relative differences in reproductive investment

2014 ◽  
Vol 281 (1790) ◽  
pp. 20140333 ◽  
Author(s):  
Crystal M. Vincent ◽  
Darryl T. Gwynne
Keyword(s):  
Immune Response ◽  
Sex Differences ◽  
Immune System ◽  
Sexual Dimorphism ◽  
Parental Investment ◽  
Sex Role ◽  
Reproductive Investment ◽  
Paternal Investment ◽  
Sexual Competition ◽  
Relative Differences

Sex differences in immunity are often observed, with males generally having a weaker immune system than females. However, recent data in a sex-role-reversed species in which females compete to mate with males suggest that sexually competitive females have a weaker immune response. These findings support the hypothesis that sexual dimorphism in immunity has evolved in response to sex-specific fitness returns of investment in traits such as parental investment and longevity, but the scarcity of data in sex-reversed species prevents us from drawing general conclusions. Using an insect species in which males make a large but variable parental investment in their offspring, we use two indicators of immunocompetence to test the hypothesis that sex-biased immunity is determined by differences in parental investment. We found that when the value of paternal investment was experimentally increased, male immune investment became relatively greater than that of females. Thus, in this system, in which the direction of sexual competition is plastic, the direction of sex-biased immunity is also plastic and appears to track relative parental investment.

Female reproductive status affecting chimney characteristics and time allocation for surface activities in Uca rosea (Tweedie, 1937) (Brachyura, Ocypodidae)

Crustaceana ◽  
2017 ◽  
Vol 90 (13) ◽  
pp. 1605-1613 ◽  
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee ◽  
Kanitta Keeratipattarakarn
Keyword(s):  
Time Allocation ◽  
Feeding Rate ◽  
Reproductive Status ◽  
Surface Activities ◽  
Female Reproductive Status ◽  
First Time

We examined the effects of female reproductive status (ovigerous and non-ovigerous) on chimney characteristics and time allocation for surface activities in Uca rosea (Tweedie, 1937) (currently referred to as Tubuca rosea (Tweedie, 1937)). We investigated time spent on feeding, standing, in burrow, surface mating, walking, grooming, and digging of 13 ovigerous and 20 non-ovigerous females of similar-size and measured the diameter, width, and height of their chimneys. Chimneys of ovigerous females were wider and higher than those of non-ovigerous females, but chimney diameters did not differ. Ovigerous females spent less time on feeding and walking, but more time on standing, inside burrows, and mating than non-ovigerous females. Feeding rate/min did not differ between ovigerous and non-ovigerous females. This study reports, for the first time, that reproductive status of females affects chimney characteristics and time allocation for surface activities in U. rosea.

Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal

2010 ◽  
Vol 44 (19-20) ◽  
pp. 1189-1202 ◽  
Author(s):  
A. Aisenberg ◽  
F.G. Costa ◽  
M. González ◽  
R. Postiglioni ◽  
F. Pérez-Miles
Keyword(s):  
Sexual Dimorphism ◽  
Sex Role ◽  
Role Reversal ◽  
Wolf Spiders ◽  
Sex Role Reversal

Photoperiodic responses of four wild-trapped desert rodent species

1998 ◽  
Vol 275 (6) ◽  
pp. R2012-R2022 ◽  
Author(s):  
Hanan A. El-Bakry ◽  
Wafaa M. Zahran ◽  
Timothy J. Bartness
Keyword(s):  
Reproductive Status ◽  
Rodent Species ◽  
Day Length ◽  
Adult Males ◽  
Acomys Cahirinus ◽  
Desert Rodent ◽  
Female Reproductive Status ◽  
Length Changes ◽  
Running Wheels ◽  
Gerbillus Pyramidum

The purpose of this study was to examine the effect of the photoperiod on reproductive status and body and lipid masses in four Egyptian desert rodent species ( Dipodillus dasyurus, Acomys cahirinus, Gerbillus andersoni, and Gerbillus pyramidum). Adult males and females were housed in long days for 11 wk. At that time, one-half of the animals were killed and the remaining animals were moved to short days (SDs) for 11 wk. Some individuals of Gerbillus andersoni and Gerbillus pyramidum had access to running wheels. Testes index and spermatogenesis, but not testis mass, were decreased in all species in SDs. In contrast, SDs did not affect female reproductive status in all species. Exercise stimulated spermatogenesis but did not affect female reproductive status. SDs increased body and lipid masses in male Acomys cahirinus, but not in other species. Collectively, these desert rodent species were responsive to day length changes, but these changes alone did not induce robust alterations in reproductive status and body and lipid masses.

The reproductive status of both sexes affects the frequency of mating and the reproductive success of males in the ball roller beetle Canthon cyanellus cyanellus (Coleoptera: Scarabaeidae)

Behaviour ◽  
2009 ◽  
Vol 146 (11) ◽  
pp. 1499-1512 ◽  
Author(s):  
Mario Favila ◽  
Ivette Chamorro-Florescano
Keyword(s):  
Reproductive Success ◽  
Sperm Competition ◽  
Reproductive Status ◽  
Female Pair ◽  
Female Reproductive Status ◽  
Viable Sperm ◽  
Males And Females

AbstractSeveral studies have shown that males assess female reproductive status and use different mechanisms to increase their reproductive success. However, a male's reproductive status can also affect its own reproductive success. In Canthon cyanellus cyanellus, a male–female pair makes several brood balls during nesting and both care for the brood balls. However, in females that are transported to the nest by males, the spermatheca is often already filled with viable sperm from other males, such that sperm competition is strong. We analyze the effect of the reproductive status of males and females on the frequency of mating during brood ball construction, as well as the reproductive success of males that nest with previously mated females. Virgin and previously mated males copulated with the same frequency before the construction of each brood ball when they nested with virgin females. However, when both types of males nested with previously mated females, the frequency of mating increased before the construction of the first brood ball. The paternity of previously mated males was significantly higher (82%) than that of virgin males (62%). Therefore, the reproductive status of both sexes of C. c. cyanellus affects the frequency of mating and the reproductive success of males.

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