Effects of time-dependent competition for oviposition sites on clutch sizes and offspring sex ratios in a fig wasp

Motoaki Kinoshita, Eiiti Kasuya, Tetsukazu Yahara

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Fig wasps have been known as one of the best-documented examples of female-biased sex ratio predicted from the local mate competition (LMC) theory. However, observed sex ratios appear more female-biased than predicted. Before a close match between theory and observation can be claimed, the number and sex ratio of offspring left by each foundress in a multi-foundress syconium need to be determined. We examined the clutch size and sex ratio of individual females of the pollinator fig wasp Blastophaga nipponica (Agaonidae) in experiments using a pair of fertile and sterile females in which sequence and time interval of entering syconia were manipulated. To determine the number and sex ratio of offspring left by each foundress in a multi-foundress syconium, we prepared sterilized females that could oviposit ordinarily but whose offspring could not develop at all, by irradiating the females with 60Co gamma rays. Female fig wasps contributed different numbers and sex ratios of offspring to the total brood within a syconium, due to different entry times among them. The variation in clutch sizes with different entry times appeared to be caused by competition for oviposition sites, and sex ratios to be adjusted according to the clutch size.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalOikos
Volume96
Issue number1
DOIs
Publication statusPublished - Jun 3 2002

Fingerprint

Agaonidae
oviposition sites
clutch size
wasp
oviposition
sex ratio
Blastophaga
pollinating insects
effect
pollinator
gamma radiation

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

Cite this

Effects of time-dependent competition for oviposition sites on clutch sizes and offspring sex ratios in a fig wasp. / Kinoshita, Motoaki; Kasuya, Eiiti; Yahara, Tetsukazu.

In: Oikos, Vol. 96, No. 1, 03.06.2002, p. 31-35.

Research output: Contribution to journalArticle

@article{292325c469f64f6685d74fcc8ec58b5c,
title = "Effects of time-dependent competition for oviposition sites on clutch sizes and offspring sex ratios in a fig wasp",
abstract = "Fig wasps have been known as one of the best-documented examples of female-biased sex ratio predicted from the local mate competition (LMC) theory. However, observed sex ratios appear more female-biased than predicted. Before a close match between theory and observation can be claimed, the number and sex ratio of offspring left by each foundress in a multi-foundress syconium need to be determined. We examined the clutch size and sex ratio of individual females of the pollinator fig wasp Blastophaga nipponica (Agaonidae) in experiments using a pair of fertile and sterile females in which sequence and time interval of entering syconia were manipulated. To determine the number and sex ratio of offspring left by each foundress in a multi-foundress syconium, we prepared sterilized females that could oviposit ordinarily but whose offspring could not develop at all, by irradiating the females with 60Co gamma rays. Female fig wasps contributed different numbers and sex ratios of offspring to the total brood within a syconium, due to different entry times among them. The variation in clutch sizes with different entry times appeared to be caused by competition for oviposition sites, and sex ratios to be adjusted according to the clutch size.",
author = "Motoaki Kinoshita and Eiiti Kasuya and Tetsukazu Yahara",
year = "2002",
month = "6",
day = "3",
doi = "10.1034/j.1600-0706.2002.960103.x",
language = "English",
volume = "96",
pages = "31--35",
journal = "Oikos",
issn = "0030-1299",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Effects of time-dependent competition for oviposition sites on clutch sizes and offspring sex ratios in a fig wasp

AU - Kinoshita, Motoaki

AU - Kasuya, Eiiti

AU - Yahara, Tetsukazu

PY - 2002/6/3

Y1 - 2002/6/3

N2 - Fig wasps have been known as one of the best-documented examples of female-biased sex ratio predicted from the local mate competition (LMC) theory. However, observed sex ratios appear more female-biased than predicted. Before a close match between theory and observation can be claimed, the number and sex ratio of offspring left by each foundress in a multi-foundress syconium need to be determined. We examined the clutch size and sex ratio of individual females of the pollinator fig wasp Blastophaga nipponica (Agaonidae) in experiments using a pair of fertile and sterile females in which sequence and time interval of entering syconia were manipulated. To determine the number and sex ratio of offspring left by each foundress in a multi-foundress syconium, we prepared sterilized females that could oviposit ordinarily but whose offspring could not develop at all, by irradiating the females with 60Co gamma rays. Female fig wasps contributed different numbers and sex ratios of offspring to the total brood within a syconium, due to different entry times among them. The variation in clutch sizes with different entry times appeared to be caused by competition for oviposition sites, and sex ratios to be adjusted according to the clutch size.

AB - Fig wasps have been known as one of the best-documented examples of female-biased sex ratio predicted from the local mate competition (LMC) theory. However, observed sex ratios appear more female-biased than predicted. Before a close match between theory and observation can be claimed, the number and sex ratio of offspring left by each foundress in a multi-foundress syconium need to be determined. We examined the clutch size and sex ratio of individual females of the pollinator fig wasp Blastophaga nipponica (Agaonidae) in experiments using a pair of fertile and sterile females in which sequence and time interval of entering syconia were manipulated. To determine the number and sex ratio of offspring left by each foundress in a multi-foundress syconium, we prepared sterilized females that could oviposit ordinarily but whose offspring could not develop at all, by irradiating the females with 60Co gamma rays. Female fig wasps contributed different numbers and sex ratios of offspring to the total brood within a syconium, due to different entry times among them. The variation in clutch sizes with different entry times appeared to be caused by competition for oviposition sites, and sex ratios to be adjusted according to the clutch size.

UR - http://www.scopus.com/inward/record.url?scp=0036112244&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036112244&partnerID=8YFLogxK

U2 - 10.1034/j.1600-0706.2002.960103.x

DO - 10.1034/j.1600-0706.2002.960103.x

M3 - Article

AN - SCOPUS:0036112244

VL - 96

SP - 31

EP - 35

JO - Oikos

JF - Oikos

SN - 0030-1299

IS - 1

ER -