The adaptive significance of non-contact mate guarding by males of the dragonfly,Nannophya pygmaea Rambur (Odonata: Libellulidae)

1985 ◽  
Vol 3 (2) ◽  
pp. 135-141 ◽  
Author(s):  
Yoshitaka Tsubaki ◽  
Tomohiro Ono
Keyword(s):  
Mate Guarding ◽  
Adaptive Significance ◽  
Nannophya Pygmaea

Comparative Mating Systems of Two Rhagoletis Species: The Adaptive Significance of Mate Guarding

2020 ◽  
pp. 43-49
Author(s):  
Susan B. Opp ◽  
Steven A. Spisak ◽  
Aparna Telang ◽  
Sha S. Hammond
Keyword(s):  
Mating Systems ◽  
Mate Guarding ◽  
Adaptive Significance

Prolonged copulation and the internal dynamics of sperm transfer in the water strider Aquarius remigis

2001 ◽  
Vol 79 (10) ◽  
pp. 1801-1812 ◽  
Author(s):  
Veronique Campbell ◽  
Daphne J Fairbairn
Keyword(s):  
Mate Guarding ◽  
Adaptive Significance ◽  
Water Strider ◽  
Costs And Benefits ◽  
Storage Organ ◽  
Natural Conditions ◽  
Aquarius Remigis ◽  
Prolonged Copulation ◽  
New Interpretation ◽  
And Storage

Copulations lasting much longer than required to effect insemination are common throughout the Insecta, but their adaptive significance remains obscure. We address the hypothesis that prolonged copulations benefit male Aquarius remigis (Hemiptera, Gerridae) by influencing sperm use and storage following insemination. We describe the gynatrial complex of females and document sperm location immediately following 32 naturally terminated and 25 artificially terminated copulations. We also examine sperm storage in 22 females isolated from males for 2–10 days. Our results demonstrate that insemination occurs at the end of copulation, and therefore that prolonged copulation is not a post-insemination mate-guarding tactic, as was previously assumed. Sperm are transferred in a coherent, coiled mass and move rapidly to the spermathecal tube, the primary storage organ. However, a few sperm move directly to the fecundation canal and hence should be capable of immediate fertilization. Prolonged copulation is associated with increased filling of the spermathecal tube, which may indicate some form of copulatory courtship or sperm loading by males during the prolonged pre-insemination phase. We discuss this new interpretation of prolonged copulation in A. remigis in the context of the overall costs and benefits of prolonged copulation for both sexes under the natural conditions of polygynandry.

Adaptive significance of mass-flowering in Hedychium coccineum (Zingiberaceae)

2013 ◽  
Vol 20 (3) ◽  
pp. 376-385
Author(s):  
Gao Jiangyun ◽  
Sheng Chunling ◽  
Yang Shuxia
Keyword(s):  
Adaptive Significance ◽  
Mass Flowering

Intersexual and Intrasexual Competition and Their Relation to Jealousy

2019 ◽  
pp. 214-236
Author(s):  
Abraham P. Buunk ◽  
Karlijn Massar ◽  
Pieternel Dijkstra ◽  
Ana María Fernández
Keyword(s):  
Sex Differences ◽  
Individual Differences ◽  
Menstrual Cycle ◽  
Attachment Styles ◽  
Mate Guarding ◽  
Intrasexual Competition ◽  
Online Infidelity ◽  
Intersexual Competition

This chapter discusses sex differences in intersexual competition and describes particularly the consequences of such competition for conflict between the sexes, as well as for sex differences in mate guarding and, relatedly, in the types of infidelity that evoke jealousy, including online infidelity. It also discusses individual differences in jealousy as related to attachment styles and describes the effects of height, hormones, and the menstrual cycle on jealousy. Next, the chapter moves on to intrasexual competition and discusses, among other topics, intrasexual competition among men and among women, the role of sex differences in rival characteristics in evoking jealousy, the role of attachment styles and hormones, and individual differences in intrasexual competitiveness.

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