Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/3912
Título: Efeito do regime alimentar no desenvolvimento larvar de Thaumetopoea pityocampa e Thaumetopoea wilkinsoni
Autor: Rocha, Susana Cristina Machado
Orientador: Simões, Manuela Rodrigues Branco
Palavras-chave: Thaumetopoea pityocampa
Thaumetopoea wilkinsoni
Pinus pinaster
Pinus halepensis
feeding
survival
Data de Defesa: 2011
Citação: Rocha, Susana Cristina Machado - Efeito do regime alimentar no desenvolvimento larvar de Thaumetopoea pityocampa e Thaumetopoea wilkinsoni. Lisboa: ISA, 2011
Resumo: The winter pine processionary moth, Thaumetopoea pityocampa Den. & Schifft (Lepidoptera: Notodontidae) is the major pine defoliator in the Mediterranean area (Southern Europe, North Africa and Near East) (Avtzis, 1986; Douma-Petridou, 1989; Markalas, 1998; OEPP/EPPO, 2004). In Portugal, the maritime pine Pinus pinaster Ainton is the main host species for T. pityocampa, followed by Pinus pinea Linnaeus, especially in the southern areas. On the other hand, in eastern countries of the Mediterranean basin, from Turkey to south of Israel, a sister species, Thaumetopoea wilkinsoni Tams (Lepidoptera: Notodontidae), which is phylogenetically very close to T. pityocampa, also constituting an important pest of pine forests, feeds mostly on P. halepensis Miller and P. brutia Tenore. In the present study we aim at testing that the two pine processionary moth species, T. pityocampa and T. wilkinsoni, differ in their performance in relation to host pine species. Feeding trials were conducted using first and second instar larvae of T. pityocampa (obtained from egg masses collected from Portugal) and T. wilkinsoni (obtained from egg masses collected from Israeli). Replicas consisted of groups of 20 to 25 larvae of the same age. Larvae were fed with one of the following diets: P. pinaster from field (10 years old); P. pinaster from nursery (7 years old) (only T. wilkinsoni was tested with this diet); P. halepensis from three different provenances all kept in potted trees in nursery (5 years old); and P. halepensis from the field (8 years old). Survival, development, needle consumption and production of feaces were recorded. Samples of pine needles were collected and analysed for its C, N and water contents, needle toughness and terpenes. Both T. wilkinsoni and T. pityocampa had a higher survival when fed with P. halepensis, from nursery, and lowest when fed with P. pinaster from field conditions. Lower content in N and higher needle’s toughness found on this diet may account for this result. Also, survival and development of T. wilkinsoni on alepo pine was signficantly higher than T. pityocampa fed on alepo pine, agreeing with the hypothesis of a better adaptation of T. wilkinsoni to feed on alepo pine. Within each pine species, plants form nursery provided a better food than plants from the field, which may be justified by the higher N content, concluding that food quality was one of the most important factors in determining larval performance. Terpenes differed between pine species and provenances of alepo pine. Higher proportion of β-pinene and germacrene was found on maritime pine in comparison with alepo pine (α-pinene, myrcene, limonene and β-caryophilene). Yet, terpene profile was similar for both P. pinaster from field and P. pinaster from nursery, whereas larval performance of T. wilkinsoni differed significantly between this two diets. Thus, differences on terpenes are unlike to justify larvae performance. In conclusion, the quality of pine needles was found to major determine larval performance of these two phytophagous insects, in particular N content. The two species seem further to differ on their adaptation to P. halepensis as food source.
Descrição: Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/3912
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

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