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Titolo:
VARIATIONS IN SPERM NUMBER IN RELATION TO LARVAL CROWDING AND SPERMATOPHORE SIZE IN THE ARMYWORM, PSEUDALETIA-SEPARATA
Autore:
HE Y; MIYATA T;
Indirizzi:
NAGOYA UNIV,SCH AGR SCI,LAB APPL ENTOMOL NAGOYA AICHI 46401 JAPAN NAGOYA UNIV,SCH AGR SCI,LAB APPL ENTOMOL NAGOYA AICHI 46401 JAPAN
Titolo Testata:
Ecological entomology
fascicolo: 1, volume: 22, anno: 1997,
pagine: 41 - 46
SICI:
0307-6946(1997)22:1<41:VISNIR>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLODIA-INTERPUNCTELLA LEPIDOPTERA; APYRENE SPERM; COMPETITION GAMES; EUPYRENE; STRATEGIES; PYRALIDAE; NOCTUIDAE; MATINGS; CHOICE;
Keywords:
PSEUDALETIA SEPARATA; EUPYRENE SPERM; APYRENE SPERM; SPERMATOPHORE SIZE; LARVAL CROWDING; SPERM COMPETITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
Y. He e T. Miyata, "VARIATIONS IN SPERM NUMBER IN RELATION TO LARVAL CROWDING AND SPERMATOPHORE SIZE IN THE ARMYWORM, PSEUDALETIA-SEPARATA", Ecological entomology, 22(1), 1997, pp. 41-46

Abstract

1. Number of sperm and its relationship with larval rearing density were investigated in the armyworm Pseudaletia separata. Males that emerged from crowded larvae produced significantly more apyrene sperm thanthose from solitary larvae (375 700 +/- 116 600 and 290 300 +/- 99 600 at a mating with a 3-day old virgin, respectively), with no significant difference in number of eupyrene sperm between the two types beingobserved. 2. For both solitary- and crowded-type, the amount of fertile sperm the males produced at a mating exceeded the number needed to fertilize all of a female's eggs, suggesting that sperm competition may be a major selective force for keeping sperm numerous. The production of more apyrene sperm by crowded-type males may be an adaptation to cope with the increased sperm competition from rival males at high density. 3. The relationship between number of sperm and spermatophore size was also studied using solitary-type moths. Large spermatophores were found to have more eupyrene and apyrene sperm than small ones.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 12:57:30