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Colonization of Madeira by the speckled wood butterfly, Pararge aegeria (Lepidoptera: Satyridae), and its impact on the endemic Pararge xiphia
On 8 October 1976, N. D. Riley caught a female speckled wood butterfly, Pararge aegeria (L.), at Ribeiro Frio (elevation 860 m) on the western Atlantic island of Madeira (Higgins, 1977); the specimenExpand
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Pupal polymorphism in the butterfly Danaus Chrysippus (L.): environmental, seasonal and genetic influences
The pupae of the tropical butterfly Danaus chrysippus are either green or pink the switch being operated by a ‘greening’ hormone produced in the larval head. Both environmental and genetic cues areExpand
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Thyroid imaging using positron emission tomography--a comparison with ultrasound imaging and conventional scintigraphy in thyrotoxicosis.
Forty-six comparative studies were performed on 41 patients with hyperthyroidism. Clinically these comprised two groups: those with Graves' disease, and those with multinodular goitre. All patientsExpand
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