scholarly journals Body size and sperm quality in queen‐ And worker‐produced ant males

2020 ◽  
Vol 33 (6) ◽  
pp. 842-849
Author(s):  
Julia Giehr ◽  
Jennifer Wallner ◽  
Theresa Krüger ◽  
Jürgen Heinze
Keyword(s):  
Body Size ◽  
Sperm Quality ◽  
Ant Males

Author response for "Body size and sperm quality in queen‐ and worker‐produced ant males"

2020 ◽  
Author(s):  
Julia Giehr ◽  
Jennifer Wallner ◽  
Theresa Krüger ◽  
Jürgen Heinze
Keyword(s):  
Body Size ◽  
Sperm Quality ◽  
Author Response ◽  
Ant Males

Sperm competition and fertilization success in Atlantic cod (Gadus morhua): effect of sire size and condition factor on gamete quality

1999 ◽  
Vol 56 (12) ◽  
pp. 2315-2323 ◽  
Author(s):  
Ana Rakitin ◽  
Moira M Ferguson ◽  
Edward A Trippel
Keyword(s):  
Body Size ◽  
Sperm Competition ◽  
Gadus Morhua ◽  
Condition Factor ◽  
Atlantic Cod ◽  
Sperm Quality ◽  
Fertilization Success ◽  
Male Body ◽  
Single Female ◽  
Male Condition

Sperm competition experiments were conducted to test the null hypothesis that sperm quality is not affected by male body size in Atlantic cod (Gadus morhua). Genetic markers (allozymes) were used to determine the proportion of larvae sired by pairs of males when their sperm was combined with eggs of a single female simultaneously. Significant differences in fertilization success between males were not explained by differences in body size. Fertilization success was positively associated with male condition factor (K) and with spermatozoa density in each male's semen when equal volumes of semen from each male were used. Male K was positively associated with male fertilization success when the volume of semen used from each male was adjusted to add approximately equal numbers of spermatozoa from each male. The relative fertilization success of males varied depending on which female was the egg donor, suggesting that female "choice" at the gamete level may be occurring in cod.

scholarly journals Sperm quality and quantity evolve through different selective processes in the Phasianidae

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Wen Bo Liao ◽  
Mao Jun Zhong ◽  
Stefan Lüpold
Keyword(s):  
Body Size ◽  
Sperm Competition ◽  
Sperm Quality ◽  
Sperm Storage ◽  
Sperm Length ◽  
Sperm Number ◽  
Selective Force ◽  
Storage Duration ◽  
Selective Pressures ◽  
Multivariate Traits

AbstractSperm competition is often considered the primary selective force underlying the rapid and diversifying evolution of ejaculate traits. Yet, several recent studies have drawn attention to other forms of selection with the potential of exceeding the effects of sperm competition. Since ejaculates are complex, multivariate traits, it seems plausible that different ejaculate components vary in their responses to different selective pressures. Such information, however, is generally lacking as individual ejaculate traits tend to be studied in isolation. Here, we studied the macroevolutionary patterns of ejaculate volume, sperm number, sperm length and the proportion of viable normal sperm in response to varying levels of sperm competition, body size and the duration of female sperm storage in pheasants and allies (Phasianidae). Ejaculate volume, sperm number and sperm viability were all relatively higher in polygamous than in monogamous mating systems. However, whereas ejaculate volume additionally covaried with body size, sperm number instead increased with the female sperm-storage duration, in conjunction with a decrease in sperm length. Overall, our results revealed important details on how different forms of selection can jointly shape ejaculates as complex, composite traits.

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