Abstract
AbstractThe metabolic rates of gravid and nongravid females of two subspecies of Sceloporus aeneus exhibiting different reproductive modes (oviparity and viviparity) were compared. Both oviparous and viviparous gravid females exhibited a significant increase in oxygen consumption over that of nongravid females of either reproductive mode. Weight‐specific oxygen consumption also is greater in gravid than in nongravid females. The alteration in metabolic rate in gravid females is attributed to a fetal–maternal difference in this parameter‐that is, an altered maternal physiology associated with pregnancy.key words weight‐specific metabolism, reproduction,oxygen consumption,Sceloporus aeneus reptilia, squamata,iquanidae
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