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()4ma. lttlt11-l\. pp. lt27-1t33 Effects of Low

Summary: ()4ma. lttlt11-l\. pp. lt27-1t33
Effects of Low
RosrN M.
-T-l HE relirtivelyl()w tempet2rnt|.esal high ele-
I vatiottsartd latitrrtlcs:ut' th,ruglrtto l:tor
an increase in thc length ol' egg rctenti()n bv
I'enralesquamatesand, ultirnately,the evolution
of viviparity (Tinkle and Gibl>ons, l977; Packard
et al., 1977;Shine, l9ft5). The putative selective
basis for increasingly longer pcriods ol egg re-
tenti()n is that cmbryos will expcrience warmer
temperzrtures (and hence dervelopmore rapid-
ly) while retained in utero tl-ranthev would in
nestsbecauseof the therrnoregulatory capabil-
iw o1'l'emales.In addition, thc I'emalecould pre-
vent exp()sure of the embr-vosto lethal l()w tem-
peratrlres. However, an increase in the length ()1'
egg retention is not the onlv mechanism that
would allow squamate embry low ambicnt temperatures in nests at high ele-


Source: Andrews, Robin - Department of Biological Sciences, Virginia Tech


Collections: Environmental Sciences and Ecology