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Titolo:
RELATIONSHIP BETWEEN TEMPERATURE, NUMBER OF INSTARS, LARVAL GROWTH, BODY-SIZE, AND ADULT FECUNDITY OF QUADRICALCARIFERA-PUNCTATELLA (LEPIDOPTERA, NOTODONTIDAE) - COST-BENEFIT RELATIONSHIP
Autore:
KAMATA N; IGARASHI M;
Indirizzi:
TOHOKU RES CTR,FORESTRY & FOREST PROD RES INST,NABEYASHIKI 72 MORIOKAIWATE 02001 JAPAN
Titolo Testata:
Environmental entomology
fascicolo: 3, volume: 24, anno: 1995,
pagine: 648 - 656
SICI:
0046-225X(1995)24:3<648:RBTNOI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
HOST;
Keywords:
QUADRICALCARIFERA PUNCTATELLA; EXTRA INSTARS; BODY WEIGHT; FOREWING AREA; LARVAL DURATION; TRADE-OFFS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
N. Kamata e M. Igarashi, "RELATIONSHIP BETWEEN TEMPERATURE, NUMBER OF INSTARS, LARVAL GROWTH, BODY-SIZE, AND ADULT FECUNDITY OF QUADRICALCARIFERA-PUNCTATELLA (LEPIDOPTERA, NOTODONTIDAE) - COST-BENEFIT RELATIONSHIP", Environmental entomology, 24(3), 1995, pp. 648-656

Abstract

The relationship between larval growth, body size, and the number of larval stages and fecundity of Quadricalcarifera punctatella (Motschulsky) was investigated by rearing larvae under constant conditions. Fecundity, adult weight, and forewing area were strongly correlated. Forewing area measurement method may be good for estimating fecundity of field-trapped adults in future studies. Larvae were not able to developat constant temperatures below 12 degrees C, but the developmental threshold was estimated as approximate to 8.5 degrees C for first and second instars. High temperatures >25 degrees C also seemed to be unfavorable to larvae, because body size decreased and larval duration was prolonged. Larval development was comprised of four or occasionally Eveinstars. This extra molt lengthened the duration of the larval stage and enlarged body size. Because larger mature larvae became larger adults with greater fecundity, larval growth was important in determiningfecundity. There was a tendency for larvae exhibiting five instars tobe smaller during the third stadium. There was also an increased frequency of extra instars at high temperatures. This phenomenon can be explained by a cost-benefit trade-off; prolongation of the larval periodcaused by an extra molt may result in increased mortality (a cost), but it also causes increased body size and fecundity (a benefit). And, the larval period of individuals with four instars was longer at 25 degrees C than at 20 degrees C, but no such developmental delay was observed for larvae with five instars. An extra molt is, therefore, also an adaptation to high temperatures. These trade-offs could also explainthe variation in numbers of instars among years in field populations;extra instars were less common in 1982 when larval duration was longer than in the other 2 yr, especially at low temperatures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 21:51:45