Jacobs Journal of Entomology and Zoological Studies

Selective Oviposition of a Natural Population of Drosophila ananassae

*Emilio Pimentel
Departamento De Biologia, Carretera México-Toluca, Instituto Nacional De Investigaciones Nucleares (ININ), Mexico

*Corresponding Author:
Emilio Pimentel
Departamento De Biologia, Carretera México-Toluca, Instituto Nacional De Investigaciones Nucleares (ININ), Mexico
Email:emilio.pimentel@inin.gob.mx

Published on: 2018-05-29

Abstract

An important and complex adaptive behavior that influences the speciation potential of the populations is the selection of the most suitable site for oviposition. However, the mechanisms underlying this process remain as a subject of matter. In the present study, the male influence on the selection for oviposition site was evaluated in a natural population of Drosophila ananassae from Laguna Verde, Veracruz, Mexico. The females collected in nature were established and analyzed as isofemale (IF) line. Females from each IF were allowed to lay eggs in three types of medium: unconditioned medium (UM), conditioned tracked by females medium (TF) and conditioned tracked by males medium (TM). The number of eggs laid per female was counted every 24 h for ten consecutive days. Two types of IF’s where found: (a) high and (b) low fecundity. Results showed a strong preference to lay eggs on TM for both types of IF, but the number of eggs laid by low fecundity IF’s was triplicated, and for high fecundity IF it was doubled compared with the control. No differences were found in egg-to-adult survival between eggs laid in the different mediums.

Keywords

Drosophila ananassae; Fecundity; Oviposition; Egg-laying site; Egg-to-adult-viability; Isofemale; 9-tricosene

Introduction

Reproductive capacity is a good index of fitness in organ- isms that go through repeated cycles of rapid population growth and it has evolved as a way to maximize the poten- tial of survival for species. The study of their behavior and the factors that modify it have helped to understand the evolutionary mechanisms of adaptation of the species. It is known that fertility depends on factors such as temperature, humidity, feed quality, the texture, and color of substrate medium, size of the female or male, but also behavioral components caused by physiological changes in- fluence oviposition site selection. In Drosophila as in other insect choosing the best place to lay eggs is of profound im- portance to the survival of the future generation. Oviposition sites in nature vary in quality resulting in significant differ- ences in reproductive success, this is: best sites guarantee a greater number of offspring. Since the seventies, the genus Drosophila has been used to evaluate various factors that influence the selection by females of the best places to lay eggs, the genetic basis that controls the election and the “de- cision” laying eggs by females of Drosophila have been also investigated.