Effects of mating history on ejaculate size, fecundity, longevity, and copulation duration in the ant-tended lycaenid butterfly, Jalmenus evagoras

2000 ◽  
Vol 47 (3) ◽  
pp. 119-128 ◽  
Author(s):  
L. Hughes ◽  
B. Siew-Woon Chang ◽  
D. Wagner ◽  
N. E. Pierce
Keyword(s):  
Copulation Duration ◽  
Mating History ◽  
Ejaculate Size ◽  
Jalmenus Evagoras ◽  
Lycaenid Butterfly

The influence of ants on host plant selection by Jalmenus evagoras, a myrmecophilous lycaenid butterfly

1985 ◽  
Vol 16 (3) ◽  
pp. 209-222 ◽  
Author(s):  
Naomi E. Pierce ◽  
Mark A. Elgar
Keyword(s):  
Host Plant ◽  
Host Plant Selection ◽  
Plant Selection ◽  
Jalmenus Evagoras ◽  
Lycaenid Butterfly

The costs and benefits of cooperation between the Australian lycaenid butterfly, Jalmenus evagoras, and its attendant ants

1987 ◽  
Vol 21 (4) ◽  
pp. 237-248 ◽  
Author(s):  
N. E. Pierce ◽  
R. L. Kitching ◽  
R. C. Buckley ◽  
M. F. J. Taylor ◽  
K. F. Benbow
Keyword(s):  
Costs And Benefits ◽  
Jalmenus Evagoras ◽  
Lycaenid Butterfly

Ejaculate size variation in the migratory locust, Locusta migratoria

Behaviour ◽  
2003 ◽  
Vol 140 (3) ◽  
pp. 319-332 ◽  
Author(s):  
Debora Arlt ◽  
Klaus Reinhardt
Keyword(s):  
Sperm Competition ◽  
Locusta Migratoria ◽  
Good Condition ◽  
Size Variation ◽  
Copulation Duration ◽  
Female Size ◽  
Testis Weight ◽  
Migratory Locust ◽  
Ejaculate Size ◽  
Older Males

AbstractSperm competition models suggest that ejaculate size (ES) is adjusted in relation to female fecundity and the risk of sperm competition, depending on the information males have about that risk. We tested these ideas in the migratory locust, Locusta migratoria, a species in which ES may be an important male fitness parameter. Copulation duration was positively correlated with ES. Males did not increase copulation duration but sperm transfer in the presence of competitors during mating. They did so only when they were reared in conditions that allowed female perception prior to mating. Males that prior to mating were kept with other males only did not show ES variation with regard to different sex ratios at mating. Increased female availability did not affect ES. A male size and condition related parameter was not significantly correlated to ES but older males delivered smaller ejaculates. Females of larger size were inseminated larger amounts of sperm. There was a positive correlation between female size and ES only for males of lower condition and lower relative testis weight but not for males of good condition or higher relative testis weight.

Local distribution of the lycaenid butterfly, Jalmenus evagoras, in response to host ants and plants

Oecologia ◽  
1988 ◽  
Vol 76 (3) ◽  
pp. 416-422 ◽  
Author(s):  
John T. Smiley ◽  
Peter R. Atsatt ◽  
Naomi E. Pierce
Keyword(s):  
Local Distribution ◽  
Jalmenus Evagoras ◽  
Lycaenid Butterfly

Effects of condition and sperm competition risk on sperm allocation and storage in neriid flies

2019 ◽  
Author(s):  
Zachariah Wylde ◽  
Angela Crean ◽  
Russell Bonduriansky
Keyword(s):  
Sperm Competition ◽  
Perceived Risk ◽  
Reproductive Tract ◽  
Female Reproductive Tract ◽  
The Body ◽  
Condition Dependence ◽  
Ejaculate Size ◽  
Sperm Competition Risk ◽  
High Condition ◽  
Allocation Strategies

Abstract Ejaculate traits can be sexually selected and often exhibit heightened condition-dependence. However, the influence of sperm competition risk in tandem with condition-dependent ejaculate allocation strategies is relatively unstudied. Because ejaculates are costly to produce, high-condition males may be expected to invest more in ejaculates when sperm competition risk is greater. We examined the condition-dependence of ejaculate size by manipulating nutrient concentration in the juvenile (larval) diet of the neriid fly Telostylinus angusticollis. Using a fully factorial design we also examined the effects of perceived sperm competition risk (manipulated by allowing males to mate first or second) on the quantity of ejaculate transferred and stored in the three spermathecae of the female reproductive tract. To differentiate male ejaculates, we fed males nontoxic rhodamine fluorophores (which bind to proteins in the body) prior to mating, labeling their sperm red or green. We found that high-condition males initiated mating more quickly and, when mating second, transferred more ejaculate to both of the female’s posterior spermathecae. This suggests that males allocate ejaculates strategically, with high-condition males elevating their ejaculate investment only when facing sperm competition. More broadly, our findings suggest that ejaculate allocation strategies can incorporate variation in both condition and perceived risk of sperm competition.

The distribution and density of a lycaenid butterfly in relation to Lasius ants

Oecologia ◽  
1992 ◽  
Vol 91 (3) ◽  
pp. 439-446 ◽  
Author(s):  
D. Jordano ◽  
J. Rodr�guez ◽  
C. D. Thomas ◽  
J. Fern�ndez Haeger
Keyword(s):  
Lycaenid Butterfly

Pharmacokinetics and pharmacodynamics of testosterone enanthate and dihydrotestosterone enanthate in non-human primates

1990 ◽  
Vol 122 (4) ◽  
pp. 432-442 ◽  
Author(s):  
Gerhard F. Weinbauer ◽  
Bettina Jackwerth ◽  
Yong-Dal Yoon ◽  
Hermann M. Behre ◽  
Ching-Hei Yeung ◽  
...  
Keyword(s):  
Gnrh Agonist ◽  
Half Life ◽  
Rhesus Monkeys ◽  
Serum Testosterone ◽  
Testosterone Enanthate ◽  
Pharmacokinetics And Pharmacodynamics ◽  
Elimination Phase ◽  
Cynomolgus Monkeys ◽  
Ejaculate Size ◽  
Testicular Size

Abstract. The pharmacokinetics and pharmacodynamics of testosterone enanthate and dihydrotestosteroneenanthate were compared in orchidectomized cynomolgus monkeys (Macaca fascicularis) and in intact GnRH agonist-suppressed rhesus monkeys (Macaca mulatta). Following a single im injection of 32.8 mg testosterone enanthate or 32.7 mg dihydrotestosteroneenanthate, i.e. 23.6 mg of pure steroid, in the orchidectomized cynomolgus monkeys, serum testosterone and dihydrotestosterone levels rose to 400 and 800% of baseline, respectively, within 24 h. Androgen levels remained in that range for 3-5 days followed by a continuous decline until baseline values were attained after 4-5 weeks. The areas under the testosterone- and dihydrotestosterone-curves did not differ significantly 2290±340 (dihydrotestosterone-enanthate) vs 2920±485 (testosteroneenanthate) suggesting that similar amounts of steroid had been released from the respective ester preparation. Mean half-life estimates of the terminal elimination phase were 4 and 7 days for testosterone-enanthate and dihydrotestosterone-enanthate, respectively. In a second experiment rhesus monkeys received, at 4-weekly intervals, sc implantation of a biodegradable polylactic:polyglycolide rod loaded with the GnRH agonist buserelin. The last injection was given during week 20. GnRH agonist treatment suppressed serum bioactive LH, testosterone and dihydrotestosterone levels, testicular size, sperm production, and seminal carnitine content. The ejaculatory response to electrostimulation and the masturbatory behaviour were abolished. Testosterone or dihydrotestosterone injections at the same doses as above were given in week 10, 14, 17 and 20 of GnRH agonist treatment. Serum testosterone and dihydrotestosterone levels were stimulated 9- and 4-fold, respectively. Mean half-life estimates for testosterone-enanthate and dihydrotestosterone were 5 and 7 days, respectively. Both ester preparations completely restored the ejaculatory response, ejaculate size, masturbatory behaviour, and seminal carnitine levels. In conclusion, androgen substitution with dihydrotestosterone-enanthate, in equivalent doses, is as effective as testosterone-enanthate in restoring reproductive functions in hypogonadal monkeys.

Sign in / Sign up

Export Citation Format

Share Document