Factors Determining Variation in Fecundity of the Light Brown Apple Moth, Epiphyas Postvittana (Walker) (Tortricidae).

Author:

Danthanarayana W

Abstract

The large variation in fecundity in E. postvittana was associated with temperature, larval food plant, time of year each food plant occurs, and low-density larval crowding through mutual interference. Under field conditions, moths from larvae fed on curled dock, apple, plantain, white clover and capeweed laid > 50% of their eggs by 5-7 days old and > 80% by 8-12 days old. Cool conditions produced heavier individuals which lived longer and laid more eggs over an extended laying period. The fecundity and size (pupal weight) were probably influenced by the larval food plant and the time of year of feeding, presumably through seasonal variations in nutritive quality. Low-density larval crowding, despite excess food, significantly reduced fecundity and pupal weight; it occurs under natural conditions of high population density. The combined effect of these factors was cyclic variations in fecundity and size; more fecund, heavier individuals occurred during the cool wet months (winter generation adults) and less fecund, lighter individuals during the warm dry months (summer generation adults); spring generation adults were generally intermediate. The fecundity of E. postvittana can be adequately predicted from the number of egg-laying days.

Publisher

CSIRO Publishing

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3