bX'oI,O(JY, SYX'rEMATICH A N I, E V o l ~ l ' T l ( J N OF AUSTRALIAN FRO09 65
Prom this Htdy it i~ c:oncludd that the frequency of phenotypes
among recruitn 414 cxtnntant from year to year but that there are changes
in the survival of frogs of the lyrate phenotype related to seasonal conditions, so t h a t in cold semons the heterozygoto (lyrate) phenotype is
favoured while in warm seasons the homozygote (ridged) phenotype
is favoured (Main. 1965~).
Straughan and Main (1906) show that during 1966 a population of
C. tinnula bred twice. During the first breeding, air temperatures were
low while at the time of the second they were higher. There were more
ridged animals at the second breeding than the first (p < 0.02). However, due to an unexpected heat wave the pond dried out before the
larvae of second breeding metamorphosed. Those larvae of the first
breeding which metamorphosed were scored for phenotype and compared with the frequency in the breeding congreea from which they were
derived; the recruits were significantly different (p < 0.05 > 0.02) which
suggests that the ridged phenotype had survived better than the lyrate.
In unpub1ir;lhed resultn from Beechina the writer has shown that
C. pseudinsignijera bred in early July, 1963. On 27 September a number
of larvae had metamorphosed; 62 were collected and categorised for
phenotype. The frequencies of phenotype did not differ significantly
from the frequencies observed when the parents were breeding. At the
same time 29 late stage tadpoles were collected by netting in the pond
in which breeding had taken place. When compared with the freshly
metamcrphosed frogs there were more lyrate animals among the tadpoles
than among the frogs (p < 0.01). This suggests that the ridged animals
metamorphose earlier than the lyrate animals.
A t Rot,tnest a similar observation was made on 26 November, 1964,
when freshly metamorphosed juveniles were scored according to
whether they were still associated with the water or had completed
metamorphosis and occurred in terrestrial vegetation some distance
away. In the former there were 89 ridged and 85 lyrate animals, and
among the latter 101 ridged and 61 lyrate which are different (p < 0.05
> .0.02) again suggesting that ridged animals metamorphose early and
then movo away from the pond.
A t t'ingclly in January 1966 C. pseudinsignifem were collected on
bare w( t soil a t the edge of water and in a litter covered situation about
3-4 m from the fir& site. The polymorph frequencies a t the first site
were 17 ritlgod and 24 lyrate and the second 12 ridged and 46 lyrate
which art3 different (p < 0.05 > 0.02). These results were obtained in
full sunshine when the temperature was 27-4"C on the wet soil and
34.6"C beneath the litter where the frogs were found. The resulta suggest
that the two morphs have different temperature tolerances or water
requirements or both.
Prom this Htdy it i~ c:oncludd that the frequency of phenotypes
among recruitn 414 cxtnntant from year to year but that there are changes
in the survival of frogs of the lyrate phenotype related to seasonal conditions, so t h a t in cold semons the heterozygoto (lyrate) phenotype is
favoured while in warm seasons the homozygote (ridged) phenotype
is favoured (Main. 1965~).
Straughan and Main (1906) show that during 1966 a population of
C. tinnula bred twice. During the first breeding, air temperatures were
low while at the time of the second they were higher. There were more
ridged animals at the second breeding than the first (p < 0.02). However, due to an unexpected heat wave the pond dried out before the
larvae of second breeding metamorphosed. Those larvae of the first
breeding which metamorphosed were scored for phenotype and compared with the frequency in the breeding congreea from which they were
derived; the recruits were significantly different (p < 0.05 > 0.02) which
suggests that the ridged phenotype had survived better than the lyrate.
In unpub1ir;lhed resultn from Beechina the writer has shown that
C. pseudinsignijera bred in early July, 1963. On 27 September a number
of larvae had metamorphosed; 62 were collected and categorised for
phenotype. The frequencies of phenotype did not differ significantly
from the frequencies observed when the parents were breeding. At the
same time 29 late stage tadpoles were collected by netting in the pond
in which breeding had taken place. When compared with the freshly
metamcrphosed frogs there were more lyrate animals among the tadpoles
than among the frogs (p < 0.01). This suggests that the ridged animals
metamorphose earlier than the lyrate animals.
A t Rot,tnest a similar observation was made on 26 November, 1964,
when freshly metamorphosed juveniles were scored according to
whether they were still associated with the water or had completed
metamorphosis and occurred in terrestrial vegetation some distance
away. In the former there were 89 ridged and 85 lyrate animals, and
among the latter 101 ridged and 61 lyrate which are different (p < 0.05
> .0.02) again suggesting that ridged animals metamorphose early and
then movo away from the pond.
A t t'ingclly in January 1966 C. pseudinsignifem were collected on
bare w( t soil a t the edge of water and in a litter covered situation about
3-4 m from the fir& site. The polymorph frequencies a t the first site
were 17 ritlgod and 24 lyrate and the second 12 ridged and 46 lyrate
which art3 different (p < 0.05 > 0.02). These results were obtained in
full sunshine when the temperature was 27-4"C on the wet soil and
34.6"C beneath the litter where the frogs were found. The resulta suggest
that the two morphs have different temperature tolerances or water
requirements or both.