Discovery of Graellsia isabelae (Graells, 1849) in a high-mountain biotope of the Catalan Pyrenees (Spain) (Lepidoptera: Saturniidae)
DOI:
https://doi.org/10.57065/shilap.1152Keywords:
Lepidoptera, Saturniidae, Graellsia isabelae, Pinus uncinata, supercooling point, larval development, altitudinal distribution, host plant suitability, pheromone, SpainAbstract
This work was conducted in two stages separated by approximately 33 years, which is why it is presented in two parts. The first stage took place between 1993 and 1995, within the framework of the author’s Doctoral Thesis research (Ylla, 1997). The author transferred 28 cocoons of Graellsia isabelae (Graells, 1849) to a forest of Pinus uncinata Miller located above the village of Queralbs, at 1600 m a.s.l., (El Ripollès, Gerona, Catalonia, Spain). The objective was to test the hypothesis that “the pupa of G. isabelae cannot withstand the cold winter temperatures typical of this ecosystem”. If verified, this would explain why the species has failed to establish stable populations in high-altitude P. uncinata forests. However, the results did not support the hypothesis. Thirty years later, the situation remains unchanged: G. isabelae has still not been detected in P. uncinata forests. It will likely be necessary to repeat the study over several additional seasons in order to obtain a more robust dataset. This new research has been carried out in 2026, and the last results are presented in the second part of this paper.
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References
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