Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Mating Behavior of Malacosoma disstria at Two Levels of Mate Competition

Donald N. Bieman and J. A. Witter
The Florida Entomologist
Vol. 66, No. 2 (Jun., 1983), pp. 272-279
DOI: 10.2307/3494252
Stable URL: http://www.jstor.org/stable/3494252
Page Count: 8
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Mating Behavior of Malacosoma disstria at Two Levels of Mate Competition
Preview not available

Abstract

During a 3-year field study 2 levels of mate competition were observed in Malacosoma disstria Hübner, the forest tent caterpillar. Levels were indicated by the mean number per year of male attempts to mate females which were already in copula (interference rate). Sex ratio at emergence and population density probably determined interference rates. In the low level of mate competition, matings started late in the day and were short in duration, with some males terminating matings. In contrast, at the high level, matings began earlier and ended later with some females rejecting males and some males prolonging matings. The greater mate competition reflected a higher operational sex ratio, which probably increased the likelihood of some males finding females earlier and enhanced opportunities for females to be selective. Furthermore, the chance of sperm competition would be greater and prolonged matings were likely responses to this. Male terminated matings probably were responses to low chance of sperm competition. /// Durante un estudio de campo de 3 años se observaron 2 niveles de competencia de aparear en Malacosoma disstria Hübner. Los niveles fueron indicados por el promedio por año de tentativas por los machos de aparear con hembras ya en cópula (rango de interferencia). El rango de interferencia probablemente fue determinado por la razón de sexo y por la densidad de la población. Al nivel bajo de competencia de aparear, los apareamientos empezaron tarde en al día y duraron corto tiempo, con unos machos terminando los apareamientos. Al contraste, al nivel alto, los apareamientos empezaron más temprano y terminaron más tarde, con unas hembras rechazando los machos, y unos machos prolongando los apareamientos. La competencia mas intensa reflejo una razón operacional de sexo mas alta, la cual probablemente aumentó la probabilidad de que unos machos encontraron las hembras más temprano, y aumentó las oportunidades para las hembras ser selectivas. Ademas, la probabilidad de competencia de esperma sería mayor, y apareamientos prolongados fueron respuestas probables a esta condición. Los apareamientos terminados por los machos probablemente fueron resquestas a una probabilidad baja de competencia de espermas.

Page Thumbnails

  • Thumbnail: Page 
272
    272
  • Thumbnail: Page 
273
    273
  • Thumbnail: Page 
274
    274
  • Thumbnail: Page 
275
    275
  • Thumbnail: Page 
276
    276
  • Thumbnail: Page 
277
    277
  • Thumbnail: Page 
278
    278
  • Thumbnail: Page 
279
    279