Algunas reflexiones sobre el declive del camaleón común (Chamaeleo chamaeleon, L. 1758) en la Península Ibérica

Ruiz, Manuel Blasco; Pérez-Botec, J.L.; Cabo, J.M.

doi:10.14198/mdtrra2000.17.04

Cited by 3 publications

(1 citation statement)

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“…In Spain, the species is restricted to discontinuous patches of native Mediterranean scrub along the southern coast (Mellado et al 2001). Its life history and reproductive biology are well known (e.g., Bons and Bons 1960;Blasco et al 1985;Cuadrado and Loman 1999;Díaz-Paniagua et al 2002;Díaz-Paniagua and Cuadrado 2003); only features relevant to this research are discussed here. Mating occurs from mid-July to mid-September; oviposition is concentrated in October.…”

Section: Developmental Arrest During Embryonic Development Of the Commentioning

confidence: 99%

Developmental Arrest during Embryonic Development of the Common Chameleon (Chamaeleo chamaeleon) in Spain

Andrews¹,

Díaz‐Paniagua²,

Marco³

et al. 2008

Physiological and Biochemical Zoology

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Embryonic development of the common chameleon, Chamaeleo chamaeleon, was monitored from oviposition to hatching at a field site in southwestern Spain and in the laboratory under five experimental temperature regimes. Embryos were diapausing gastrulae at the time of oviposition; developmental arrest in the field continued as cold torpor during winter. Postarrest development in the field commenced in April, and hatching occurred in August, for a total incubation period of 10.5 mo. In the laboratory, one group of eggs was incubated at a constant warm (26 degrees C) temperature. The remaining treatments simulated field conditions and consisted of initial periods of warm temperature of 0, 27, 46, and 71 d, a subsequent 4-mo period of cold winter (16 degrees C) temperature, and a final period of warm (26 degrees C) temperature. Embryos in the constant warm temperature treatment were in diapause an average of 3 mo, with clutch means ranging from 2 to 4 mo. Hatching among clutches occurred over 2 mo. In contrast, for field and experimental eggs that experienced cold winter conditions, hatching within treatments occurred over 2-14 d; "winter" conditions synchronized development. The length of time between the end of cold conditions and hatching did not differ among treatments; development thus resumed as soon as temperature was suitable regardless of the initial period of warm temperature. Diapause in nature thus insures that embryos remain gastrulae after oviposition despite nest temperatures that may be warm enough to support development.

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Section: Developmental Arrest During Embryonic Development Of the Commentioning

confidence: 99%