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Titolo:
FEMALE BENEFIT, MALE RISK - POLYANDRY IN THE TRUE ARMYWORM PSEUDALETIA-UNIPUNCTA
Autore:
SVARD L; MCNEIL JN;
Indirizzi:
SVARVARGATAN 13 S-11249 STOCKHOLM SWEDEN UNIV LAVAL,FAC SCI & GENIE,DEPT BIOL ST FOY G1K 7P4 PQ CANADA
Titolo Testata:
Behavioral ecology and sociobiology
fascicolo: 5, volume: 35, anno: 1994,
pagine: 319 - 326
SICI:
0340-5443(1994)35:5<319:FBMR-P>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIFETIME REPRODUCTIVE SUCCESS; MALE PARENTAL CARE; PAPILIO-MACHAON L; PATERNAL INVESTMENT; GRYLLUS-BIMACULATUS; SPERM COMPETITION; INSECTS; LEPIDOPTERA; BUTTERFLIES; SPERMATOPHORE;
Keywords:
PSEUDALETIA-UNIPUNCTA; SPERM PRECEDENCE; MULTIPLE MATINGS; MALE NUTRIENT INVESTMENT; REPRODUCTIVE OUTPUT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
60
Recensione:
Indirizzi per estratti:
Citazione:
L. Svard e J.N. Mcneil, "FEMALE BENEFIT, MALE RISK - POLYANDRY IN THE TRUE ARMYWORM PSEUDALETIA-UNIPUNCTA", Behavioral ecology and sociobiology, 35(5), 1994, pp. 319-326

Abstract

In Lepidoptera polyandry is common and females may increase their lifetime reproductive output through repeated matings if they acquire essential resources from male ejaculates. However, the paternity of malesmating with previously-mated females is far from assured unless spermprecedence is absolute. In this study on the polyandrous armyworm, Pseudaletia unipuncta, we used two strains of male (the black-eyed wild type and a red-eyed homozygous, recessive mutant), mated with red-eyedfemales, to determine (i) whether male investment has any impact on female reproductive output, and (ii) if females do benefit from multiple matings, to what extent males fertilize the eggs to which they contributed. Multiple mating resulted in a significant increase in both thefecundity and longevity of females. However, the degree of sperm precedence (those eggs fertilized by the second male) varied from 0-100%, but was not affected by either male size or age, or by the duration ofcopulation. In cases where sperm precedence was <50% (xBAR = 12%) females produced significantly more eggs (1384 versus 940) prior to the second mating than females where sperm precedence was >50% (xBAR = 89%), indicating that the quality of the first mating influenced the fertilization success of the female's second mate.

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Documento generato il 02/12/20 alle ore 08:17:50