INVESTIGADORES
PEROTTI Maria gabriela
artículos
Título:
The role of climate and maternal manipulation in determining and maintaining reproductive mode in Liolaemus lizards.
Autor/es:
CRUZ, F.B.; MORENO AZOCAR, D.; PEROTTI M.G.; ACOSTA, J.; STELATELLI, O.; VEGA, L.; LUNA, F.; ANTENUCCI, D.; ABDALA, C. S.; SCHULTE II, JAMES
Revista:
JOURNAL OF ZOOLOGY (1987)
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2022
ISSN:
0952-8369
Resumen:
Abstract. Evolutionary transitions in life-history strategies, such as the shift from egg-35 laying to live birth (viviparity) are of great interest to evolutionary biologists. In36 squamate reptiles, several hypotheses have been proposed to explain viviparity including37 the cold climate hypothesis, maternal manipulation hypothesis, hypoxia hypothesis, and38 several others. We used two approaches; first we studied 45 species of Liolaemus, a39 genus where nearly 50% of species are viviparous, using a diverse ecophysiological40 dataset to examine the cold climate and maternal manipulation hypotheses. We collected41 environmental thermal data (accounting for elevational differences among species),42 physiological traits including preferred body temperature and its coefficient of variation43 as an indicator of precision in thermoregulation. Additionally, we collected standard44 metabolic rates for 23 of the 45 species. In one clade (the darwinii group of species) with45 both reproductive modes, we ran our second approach. We tested for differences in46 thermal physiology and metabolic rates between viviparous and oviparous species during47 pregnancy and non-pregnancy periods. The cold climate hypothesis received strong48 support because viviparous species occur in sites with colder air temperatures (including49 areas at both higher elevations and latitudes) compared with oviparous species. Our50 detailed analysis showed the maternal manipulation hypothesis also is supported;51 pregnant viviparous females show lower variation in their selected temperature. Our52 evidence suggests the Andean orogeny is likely to have played a key role in53 diversification of Liolaemus lizards and the evolution of viviparity in this clade may have54 been driven by a variety of physiological advantages accrued at different stages of55 embryogenesis and over evolutionary time. Thus, historical climate changes may have56 led to egg retention and may have been accompanied by other adaptations such as57 thermoregulation precision.58