Impact of maternal crowd on the reproductive performance of an ecto-pupal parasitoid Nesolynx thymus (Hymenoptera: Eulophidae)
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Nesolynx thymus Girault (Hymenoptera: Eulophidae) is one among 20 hymenopteranparasitoids reported to attack the uzi fly, Exorista bombycis , which in turn infests thesilkworm, Bombyx mori accounting a cocoon yield loss of 10-20%. A host of factors viz .,age and size of host, age and size of parasitoid, availability of host, temperature andquality of host are reported to influence the reproductive efficiency of the parasitoids. In the present study an attempt was made to record the influence of foraging parasitoiddensity on their reproductive performance. Three day-old uzi pupae were offered tovarying numbers (1 – 10) of 2 day old Nesolynx thymus adults for parasitization. Theprogeny production per pupa (84.44 - 132.77) increased significantly with increase in thenumber of foraging parasitoid adults (1 - 10) however, progeny production per femaledecreased. The sex ratio (M : F) (1:25.49 – 1:1.53) decreased significantly with increasein foraging parasitoid adults. The morphometric parameters except female abdomenwidth of first generation parasitoid showed significant negative correlation with number offoraging adults. However, correlation between the parasitoid size in first generation andtheir reproductive performance was nonsignificant.
Abstract
Nesolynx thymus Girault (Hymenoptera: Eulophidae) is one among 20 hymenopteranparasitoids reported to attack the uzi fly, Exorista bombycis , which in turn infests thesilkworm, Bombyx mori accounting a cocoon yield loss of 10-20%. A host of factors viz .,age and size of host, age and size of parasitoid, availability of host, temperature andquality of host are reported to influence the reproductive efficiency of the parasitoids. In the present study an attempt was made to record the influence of foraging parasitoiddensity on their reproductive performance. Three day-old uzi pupae were offered tovarying numbers (1 – 10) of 2 day old Nesolynx thymus adults for parasitization. Theprogeny production per pupa (84.44 - 132.77) increased significantly with increase in thenumber of foraging parasitoid adults (1 - 10) however, progeny production per femaledecreased. The sex ratio (M : F) (1:25.49 – 1:1.53) decreased significantly with increasein foraging parasitoid adults. The morphometric parameters except female abdomenwidth of first generation parasitoid showed significant negative correlation with number offoraging adults. However, correlation between the parasitoid size in first generation andtheir reproductive performance was nonsignificant.
참고문헌 (10)
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