1 / 27

Insect Reproduction

Insect Reproduction. Lecture 17. Love Bug ( Plecia neartica ). Love bugs first reported from Florida in 1949. Process of insect reproduction. Mate location Pre- copulatory courtship Copulation (Sperm transfer) Post- copulatory courtship Insemination Fertilization Oviposition.

gavril
Download Presentation

Insect Reproduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Insect Reproduction Lecture 17

  2. Love Bug (Plecianeartica) Love bugs first reported from Florida in 1949

  3. Process of insect reproduction • Mate location • Pre-copulatory courtship • Copulation (Sperm transfer) • Post-copulatory courtship • Insemination • Fertilization • Oviposition

  4. Mate location • Sexual aggregation • Individuals that need to mate convene in special sites • Typically skewed toward males • Visual marker or common resource • Lek: gathering of males for the purposes of competitive mating display • Found in many dipterans

  5. Artic fly (Rhamphomyianigrita) mating swarm

  6. Mate location • Sexual attraction • Visual, chemical, auditory signal • Species-specific signals • May involve male signaling, female signaling, or both sexes signaling • Sometimes synchronized signaling by multiple males of the same species

  7. Pre-copulatory courtship • Close-range, intersexual behavior that induces sexual receptivity prior to mating • Species recognition • Visual display, dancing, tactile stimulation, acoustic courtship, nuptial gift

  8. Sperm transfer • Indirect sperm transfer – Diplura, Thysanura, Collembola (some) • Direct sperm transfer • Direct copulation via spermatophore (lower insects) • Odonata • Spider • Direct insemination (Heteroptera, Mecoptera, Trichoptera, Hymenoptera, Coleoptera, Diptera) • Hemocoelic insemination (Cimicidae)

  9. Katydid feeding on spermatophylax

  10. Cricket spermatophore

  11. Odonata secondary copulatory structure

  12. Direct Insemination of Oncopeltus

  13. Hemoceolicinsemination(Traumatic insemination) Copulatory pouch

  14. Post-copulatory courtship • Genital courtship • In animals with internal fertilization, diversification of genitalia represents one of the most general and striking forms of evolutionary trends (Eberhard 1985). • Male genitalia are species-specific • Cryptic female choice vs. sexually antagonistic coevolution

  15. Melanoplus (Orthoptera: Acrididae) (Hubbell 1932)

  16. Otarrha (Trichoptera: Philopotamidae) (Blahnik 2002)

  17. Iolania (Hemiptera: Cixiidae) (Hoch 2002)

  18. Hypanartia (Lepidoptera: Nymphalidae) (Willmott et al. 2001)

  19. Sexual Selection • Male-male competition (exaggerated morphology, better nuptial gifts, etc.) • Female choice • Sperm competition and sperm precedence • Prolonged copulation, genital damage, genital plug

  20. Oviposition • Majority of insects lay eggs that start developing after oviposition (Oviparity) • Some insects develop eggs internally and lay live young (Viviparity)

  21. Atypical modes of reproduction • Parthenogenesis – development from unfertilized eggs • Pedogenesis – loss of adult stage and development of young within immature • Neoteny – immature-looking adult

More Related