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Netherlands Journal of Zoology 52 (1): 43-60 (2002) SOURCES OF COLOUR PATTERN VARIATION IN MEDITERRANEAN PSAMMODROMUS ALGIRUS by MIGUEL A. CARRETERO * ( Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO), Campus Agrário de Vairão. 4485-661 Vairão, Portugal ) ABSTRACT Colour pattern and its relation to sex, size and season were investigated in three coastal populations of Psammodromus algirus from NE Spain. Eight pattern variables, as well as body size and reproductive parameters, were recorded for 430 specimens. Results show that yellow head pattern was present in both males and females and depended on body size and locality. Furthermore, its seasonal variation was associated with reproductive activity in males. Orange infralabials appear almost exclusively in adult males. Blue ocelli constitute a potential size signal in intraspeci c interactions, especially in males. The attainment of sexual maturity modi ed tail colour (antipredatory) and dorsolateral stripes (cryptic). Bright spots on hindlimbs varied between sites. Colour pattern is interpreted as a trade-off between different selective pressures including crypsis and intraspeci c interactions. Most pattern variation is due to body size differences and only secondarily to sexual dimorphism. A hypothesis invoking differences in social system is proposed to explain the striking
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 2002
Keywords: colour pattern; lacertidae; sexual dimorphism.; psammodromus algirus
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