Reduced cocoon size of diprionids (Hymenoptera) reared on pollutant affected pines
1989
Helioevaara, K. (Finnish Forest Research Institute, Vantaa (Finland)) | Vaeisaenen, R.
Parthenogenetically produced male larvae of Gilpinia frutetorum, G. virens and Microdiprion pallipes, and female and male larvae of Neodiprion sertifer were reared on needles of Scots pine affected by industrial air pollutants in Finland. Needles were collected at different distances from a distinctive emmission source along two 9-km-long transects, and at independent control plots. Cocoon weight, length and width correlated with the distance from the emission source being smallest near it. Elemental composition of the pine needles and the effect of the ovipositing female covered 10-25 per cent of the variation in cocoon weight. Heavy metal levels played a major role in M. pallipes and sertifer, and phosphorus in G. virens. The size of G. frutetorum cocoons was associated only with the female the progeny of which they were
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