JN’OIAmY, HYF4TTCMA”lCS A N I , RVOI.UTION OB AUBTRAIJAN FRO08 63
Huch a d i ~ ~ < ) ~ i t i o ~ i
WLW la& m d e by Loveridge (1935). Parker (1940)
correctly recognid that similar looking variants were found in several
different species and Moore (1964) recognised the variants aa being
polymorphs. Main (1906b) presented resulta which suggested that (i)
a relatively simple gene system controlled the inheritance of the
polymorphic pattern ; (ii) one homozygote waa e a d y recognisable and
usually common in field populations while the phenotype of the other
homozygote was difficult to tell from the heterozygote; indications were
that it was rare in field populations; (iii) the expression of the phenotype
of the common homozygote was sometimes partly suppressed in the
first few weeks following metamorphosis by another factor which w&s
presumably genetic in nature.
Crinin georgiana, C. gluuerti, C . insignifera and C . pseudinsignifera
appear to have similar genetic mechanisms governing the inheritance
of dorsal pattern (Main, 1965b). The recognition that the phenotypes
are discrete and discontinuous has enabled field populations to be
sampled, so that frequency of occurrence of phenotype can be scored.
Clasping pairs have been collected at breeding sites to see whether
matings are assortative. The mating pairs collected from any site are
always few compared with the calling males at the same site and from
the small samples non-assortative mating is indicated. However, the
frequency of the phenotypes among the calling males shows considerable variation from night to night. These changes do not always reach
statistical significance but the evidence suggests that ridged males are
common in the earlier rains associated with warmer air of advancing
low pressure systems while lyrate is commoner when the air mass is
colder.
Main (1961, 1965c) showed that, in populations of C. insignifera on
Rottnat Island, the frequency O-F the polymorphs changed depending
on the cleasonal conditions (Table VI). These changes are shown in
Fig. 6. A statistical analysis by Main (1966~) and in Fig. 6 shows the
following :
Lighthowe swamp: Total population: a change in frequency of morphs
between November 1969 and November 1960 (p < 0-05 > 0.02) and
no stafistically significant change subsequently. Recruitment: no difference from year to year. Differential survival: the November adults
compared with the total March sample show differences between March
and November 1959 (p < 0.01).
Bagdud soak: No difference in morph frequencies of total population
or recruits from year to year. “here is a significant difference in survival
of frogs between March and November 1961 (p < 0.05 > 0.02).
Negri soak: No difference in morph frequencies of total population
or recruits from year to year.
Huch a d i ~ ~ < ) ~ i t i o ~ i
WLW la& m d e by Loveridge (1935). Parker (1940)
correctly recognid that similar looking variants were found in several
different species and Moore (1964) recognised the variants aa being
polymorphs. Main (1906b) presented resulta which suggested that (i)
a relatively simple gene system controlled the inheritance of the
polymorphic pattern ; (ii) one homozygote waa e a d y recognisable and
usually common in field populations while the phenotype of the other
homozygote was difficult to tell from the heterozygote; indications were
that it was rare in field populations; (iii) the expression of the phenotype
of the common homozygote was sometimes partly suppressed in the
first few weeks following metamorphosis by another factor which w&s
presumably genetic in nature.
Crinin georgiana, C. gluuerti, C . insignifera and C . pseudinsignifera
appear to have similar genetic mechanisms governing the inheritance
of dorsal pattern (Main, 1965b). The recognition that the phenotypes
are discrete and discontinuous has enabled field populations to be
sampled, so that frequency of occurrence of phenotype can be scored.
Clasping pairs have been collected at breeding sites to see whether
matings are assortative. The mating pairs collected from any site are
always few compared with the calling males at the same site and from
the small samples non-assortative mating is indicated. However, the
frequency of the phenotypes among the calling males shows considerable variation from night to night. These changes do not always reach
statistical significance but the evidence suggests that ridged males are
common in the earlier rains associated with warmer air of advancing
low pressure systems while lyrate is commoner when the air mass is
colder.
Main (1961, 1965c) showed that, in populations of C. insignifera on
Rottnat Island, the frequency O-F the polymorphs changed depending
on the cleasonal conditions (Table VI). These changes are shown in
Fig. 6. A statistical analysis by Main (1966~) and in Fig. 6 shows the
following :
Lighthowe swamp: Total population: a change in frequency of morphs
between November 1969 and November 1960 (p < 0-05 > 0.02) and
no stafistically significant change subsequently. Recruitment: no difference from year to year. Differential survival: the November adults
compared with the total March sample show differences between March
and November 1959 (p < 0.01).
Bagdud soak: No difference in morph frequencies of total population
or recruits from year to year. “here is a significant difference in survival
of frogs between March and November 1961 (p < 0.05 > 0.02).
Negri soak: No difference in morph frequencies of total population
or recruits from year to year.