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Titolo:
Reduced aggressive behavior: A benefit of silk-spinning in the parsnip webworm, Depressaria pastinacella (Lepidoptera : Oecophoridae)
Autore:
Green, ES; Zangerl, AR; Berenbaum, MR;
Indirizzi:
Univ Illinois, Dept Entomol, Urbana, IL 61801 USA Univ Illinois Urbana ILUSA 61801 ois, Dept Entomol, Urbana, IL 61801 USA
Titolo Testata:
JOURNAL OF INSECT BEHAVIOR
fascicolo: 6, volume: 11, anno: 1998,
pagine: 761 - 772
SICI:
0892-7553(199811)11:6<761:RABABO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
WILD PARSNIP; DEFENSE; CHEMISTRY; HERBIVORE; COSTS;
Keywords:
silk-spinning behavior; webs; aggressive interactions; wild parsnip;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Berenbaum, MR Univ Illinois, Dept Entomol, 505 S Goodwin, Urbana, IL 61801USA Univ Illinois 505 S Goodwin Urbana IL USA 61801 IL 61801 USA
Citazione:
E.S. Green et al., "Reduced aggressive behavior: A benefit of silk-spinning in the parsnip webworm, Depressaria pastinacella (Lepidoptera : Oecophoridae)", J INSECT B, 11(6), 1998, pp. 761-772

Abstract

The parsnip webworm, Depressaria pastinacella, spins a silken web within the umbels of its host plant, the wild parsnip Pastinaca sativa, and aggressively defends this web against conspecifics. We first established experimentally that the number of aggressive interactions between caterpillars with their webs removed was significantly higher than for webworms with intact webs. In order to determine whether web-spinning acts to divide food resources and reduce aggressive interactions, we measured relative weight gain andtotal silk production of parsnip webworms isolated from one another grouped together with webbing undisturbed, and grouped together with webbing removed daily. Parsnip webworms isolated from one another and therefore unable to engage in aggressive interactions attained the highest pupal weights andspun the smallest amount of silk; caterpillars with webs removed daily andtherefore with frequent aggressive interactions until territories were reestablished had the lowest pupal weights and spun the greatest quantity of silk. Our findings indicate that, for the parsnip webworm, constructing a silken web reduces aggressive encounters among conspecifics.

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Documento generato il 30/11/20 alle ore 05:45:20