scholarly journals Age‐specific sensitivity of sperm length and testes size to developmental temperature in the bruchid beetle

2021 ◽  
Author(s):  
R. Vasudeva ◽  
D. C. Deeming ◽  
P. E. Eady
Keyword(s):  
Sperm Length ◽  
Developmental Temperature ◽  
Specific Sensitivity ◽  
Testes Size

scholarly journals How sperm competition shapes the evolution of testes and sperm: a meta-analysis

2020 ◽  
Vol 375 (1813) ◽  
pp. 20200064
Author(s):  
Stefan Lüpold ◽  
Raïssa A. de Boer ◽  
Jonathan P. Evans ◽  
Joseph L. Tomkins ◽  
John L. Fitzpatrick
Keyword(s):  
Sperm Competition ◽  
Meta Analysis ◽  
Empirical Studies ◽  
Reproductive Behaviour ◽  
Analytical Framework ◽  
Sperm Length ◽  
Other Information ◽  
Theoretical Predictions ◽  
Testes Size ◽  
Sperm Size

Females of many species mate with multiple males, thereby inciting competition among ejaculates from rival males for fertilization. In response to increasing sperm competition, males are predicted to enhance their investment in sperm production. This prediction is so widespread that testes size (correcting for body size) is commonly used as a proxy of sperm competition, even in the absence of any other information about a species' reproductive behaviour. By contrast, a debate about whether sperm competition selects for smaller or larger sperm has persisted for nearly three decades, with empirical studies demonstrating every possible response. Here, we synthesize nearly 40 years of sperm competition research in a meta-analytical framework to determine how the evolution of sperm number (i.e. testes size) and sperm size (i.e. sperm head, midpiece, flagellum and total length) is influenced by varying levels of sperm competition across species. Our findings support the long-held assumption that higher levels of sperm competition are associated with relatively larger testes. We also find clear evidence that sperm competition is associated with increases in all components of sperm length. We discuss these results in the context of different theoretical predictions and general patterns in the breeding biology and selective environment of sperm. This article is part of the theme issue ‘Fifty years of sperm competition’.

scholarly journals High developmental temperature leads to low reproduction despite adult temperature

2021 ◽  
Vol 95 ◽  
pp. 102794
Author(s):  
Marta A. Santos ◽  
Ana Carromeu-Santos ◽  
Ana S. Quina ◽  
Mauro Santos ◽  
Margarida Matos ◽  
...  
Keyword(s):  
Developmental Temperature

Specific sensitivity of an NaI(T1) scintillator in the recording of ? rays from radioactive ores

1977 ◽  
Vol 42 (6) ◽  
pp. 566-568
Author(s):  
G. F. Novikov ◽  
A. Ya. Sinitsyn ◽  
Yu. O. Kozynda
Keyword(s):  
Specific Sensitivity

ALLOMETRIC AND NONALLOMETRIC COMPONENTS OF DROSOPHILA WING SHAPE RESPOND DIFFERENTLY TO DEVELOPMENTAL TEMPERATURE

Evolution ◽  
2003 ◽  
Vol 57 (12) ◽  
pp. 2773-2784 ◽  
Author(s):  
Vincent Debat ◽  
Mattieu Béagin ◽  
Hélène Legout ◽  
Jean R. David
Keyword(s):  
Wing Shape ◽  
Developmental Temperature ◽  
Drosophila Wing

Relative testis size and mating systems in anurans: large testis in multiple-male mating in foam-nesting frogs

2011 ◽  
Vol 61 (2) ◽  
pp. 225-238 ◽  
Author(s):  
Wen Bo Liao ◽  
Zhi Ping Mi ◽  
Cai Quan Zhou ◽  
Ling Jin ◽  
Xian Han ◽  
...  
Keyword(s):  
Sperm Competition ◽  
Published Data ◽  
Male Mating ◽  
Data Sets ◽  
Testis Size ◽  
Data Set ◽  
Monogamous Species ◽  
Large Testis ◽  
Testes Size ◽  
Testis Mass

AbstractComparative studies of the relative testes size in animals show that promiscuous species have relatively larger testes than monogamous species. Sperm competition favours the evolution of larger ejaculates in many animals – they give bigger testes. In the view, we presented data on relative testis mass for 17 Chinese species including 3 polyandrous species. We analyzed relative testis mass within the Chinese data set and combining those data with published data sets on Japanese and African frogs. We found that polyandrous foam nesting species have relatively large testes, suggesting that sperm competition was an important factor affecting the evolution of relative testes size. For 4 polyandrous species testes mass is positively correlated with intensity (males/mating) but not with risk (frequency of polyandrous matings) of sperm competition.

Sperm Competition: Mating System, Not Breeding Season, Affects Testes Size of Primates

1995 ◽  
Vol 9 (3) ◽  
pp. 468 ◽  
Author(s):  
A. H. Harcourt ◽  
A. Purvis ◽  
L. Liles
Keyword(s):  
Mating System ◽  
Sperm Competition ◽  
Breeding Season ◽  
Testes Size

scholarly journals Population‐specific effects of developmental temperature on body condition and jumping performance of a widespread E uropean frog

2016 ◽  
Vol 6 (10) ◽  
pp. 3115-3128 ◽  
Author(s):  
Sanja Drakulić ◽  
Heike Feldhaar ◽  
Duje Lisičić ◽  
Mia Mioč ◽  
Ivan Cizelj ◽  
...  
Keyword(s):  
Body Condition ◽  
Developmental Temperature ◽  
Jumping Performance ◽  
Specific Effects
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