scholarly journals Extreme variation in testes size in an insect is linked to recent mating activity

2019 ◽  
Vol 33 (2) ◽  
pp. 142-150 ◽  
Author(s):  
E. V(Ginny) Greenway ◽  
Lauren A. Cirino ◽  
Daniela Wilner ◽  
Ummat Somjee ◽  
Maria‐Eleni Anagnostou ◽  
...  
Keyword(s):  
Mating Activity ◽  
Extreme Variation ◽  
Testes Size

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 Relationship among testosterone response to GnRH administration, testes size and sperm parameters in Holstein-Friesian bulls

1995 ◽  
Vol 43 (8) ◽  
pp. 1317-1324 ◽  
Author(s):  
G. Gábor ◽  
M. Mézes ◽  
J. Tözsér ◽  
S. Bozó ◽  
E. Szücs ◽  
...  
Keyword(s):  
Sperm Parameters ◽  
Holstein Friesian ◽  
Testes Size

Transcription and Translation of the Sex Message in the Smut Fungus Ustilago Violacea

1974 ◽  
Vol 16 (1) ◽  
pp. 49-62
Author(s):  
J. E. CUMMINS ◽  
A. W. DAY
Keyword(s):  
Amino Acid ◽  
Dna Replication ◽  
Information Exchange ◽  
Plasma Membranes ◽  
Cellular Protein ◽  
Mating Activity ◽  
Ustilago Violacea ◽  
Protein Levels ◽  
Amino Acid Turnover ◽  
Mating Conditions

In Ustilago violacea conjugation involves a period of courtship followed by the cooperative assembly of a conjugation tube between paired sporidia of opposite mating type. During courtship information is exchanged between the paired sporidia directing transcription and translation of a ‘sex message’. This information exchange is completed even though the plasma membranes and walls of the mating sporidia remain intact until after the sex message has been translated. Once translation is completed the copulatory organelle is assembled. Inhibitor studies show that translation of specific mRNA species (sex message) is essential during the 3-4 h period of courtship prior to assembly and that transcription of this sex message is completed 15-30 min prior to the completion of translation. Amino acid incorporation studies show that even though the cellular protein levels remain constant during courtship there is extensive amino acid turnover as the sporidia adjust to mating conditions. However, an enhancement of amino acid turnover by mating, in contrast to unmixed sporidia, is not detectable. Prototrophic strains continue to synthesize stable RNA during courtship while amino acid auxotrophs discontinue stable RNA synthesis immediately on transfer to mating conditions. Both prototrophs and auxotrophs show extensive RNA turnover during courtship but a specific enhancement of turnover due to mating activity is not detectable from the labelling pattern alone. A round of DNA replication may be completed during courtship but mating activity does not influence the gross pattern of DNA replication in either of the mating types.

The new Belostoma fittkaui species group with supplemental descriptions of B. fittkaui De Carlo and B. sayagoi De Carlo

Zootaxa ◽  
2021 ◽  
Vol 4942 (4) ◽  
pp. 583-591
Author(s):  
FABIANO STEFANELLO
Keyword(s):  
New Species ◽  
South America ◽  
Comparative Morphology ◽  
Species Group ◽  
Type Material ◽  
Extreme Variation ◽  
Species Groups ◽  
A New Species ◽  
Tropical South America

The giant water bug fauna from tropical South America remains poorly known. Three species of Belostoma Latreille (Belostoma fittkaui De Carlo, B. sayagoi De Carlo and B. hirsutum Roback & Nieser) have been cited only a few times in the literature. These three species are remarkable since they represent an extreme variation for the genus, with article II of the labium distinctly shorter than article III. Here, the synonymy of B. hirsutum with B. sayagoi is proposed based on examination of type material and additional specimens. Further, B. fittkaui and B. sayagoi are redescribed, including discussion about comparative morphology with congeners. A new species group is proposed for these species and a key to the Belostoma species groups is provided. Distribution records are also updated. 

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