Colour Pattern Polymorphism in the Grasshopper Phaulacridium Vittatum. I. Geographic Variation in Victoria and Evidence of Habitat Association.

1984 ◽  
Vol 32 (2) ◽  
pp. 239 ◽  
Author(s):  
JM Dearn
Keyword(s):  
Geographic Variation ◽  
Habitat Associations ◽  
Colour Pattern ◽  
Habitat Association ◽  
Latitudinal Cline ◽  
Selective Constraints ◽  
South Eastern ◽  
Eastern Australia ◽  
Pattern Polymorphism ◽  
Forest Habitats

The frequencies of the 3 colour pattern morphs (plain, striped and incomplete-striped) in samples of Phaulacridium vittatum (Sjost). from pasture sites in Victoria, Australia, did not conform to the pattern predicted by the latitudinal cline in morph frequencies previously described in south-eastern Australia. Data from 2 transects across pasture-forest boundaries revealed the existence of habitat associations, with forest habitats having a higher frequency of the plain morph. The proximity of some pasture populations to forests may explain some of the variation in morph frequencies observed among pasture sites. However, the frequency of the striped morph was relatively low in all the populations examined; this suggests that there are strong selective constraints on the frequency of striped individuals.

Geographic variation in the advertisement call of Crinia signifera (Anura:Myobatrachidae) on Kangaroo Island and across southern south-eastern Australia

2008 ◽  
Vol 56 (4) ◽  
pp. 223 ◽  
Author(s):  
Murray J. Littlejohn
Keyword(s):  
Geographic Variation ◽  
Pulse Number ◽  
Advertisement Call ◽  
Regional Study ◽  
South Eastern ◽  
Island Sample ◽  
Eastern Australia ◽  
Continental Islands ◽  
Two Populations ◽  
South Eastern Australia

The male advertisement call of anuran amphibians has a major role in mate choice, and regional variation in this attribute can act as an indicator of speciation and a marker for genetic differentiation. As part of a regional study of geographic variation in the male advertisement call of Crinia signifera across south-eastern Australia and adjacent larger continental islands, samples of advertisement calls from two populations on Kangaroo Island and two populations on the adjacent Fleurieu Peninsula were compared. Four call attributes were considered: pulse number, call duration, pulse rate and dominant frequency. Pulse number is considered the most reliable for comparative purposes because it is not influenced by effective temperature or audio recording and analysis. The two island populations (central and eastern, ~24 km apart) differ significantly in pulse number, with contact but no overlap of interquartile ranges. The eastern sample differs markedly from those on the nearby Fleurieu Peninsula – which are both similar to the more distant central island sample. Geographic variation in pulse number in these four samples and 11 others from two recent publications is then interpreted in the light of land bridges and lower temperatures of the late Pleistocene and early Holocene.

scholarly journals Interspecific and Geographic Variation in the Diets of Sympatric Carnivores: Dingoes/Wild Dogs and Red Foxes in South-Eastern Australia

PLoS ONE ◽  
2015 ◽  
Vol 10 (3) ◽  
pp. e0120975 ◽  
Author(s):  
Naomi E. Davis ◽  
David M. Forsyth ◽  
Barbara Triggs ◽  
Charlie Pascoe ◽  
Joe Benshemesh ◽  
...  
Keyword(s):  
Geographic Variation ◽  
Red Foxes ◽  
South Eastern ◽  
Eastern Australia ◽  
Sympatric Carnivores ◽  
Wild Dogs ◽  
South Eastern Australia

Studies on populations of potorous Desmarest (Marsupialia) II. Electrophoretic, chromosomal and breeding studies

1977 ◽  
Vol 25 (4) ◽  
pp. 733 ◽  
Author(s):  
PG Johnston ◽  
GB Sharman
Keyword(s):  
Geographic Variation ◽  
Morphological Variation ◽  
Genetic Similarity ◽  
Genetic Basis ◽  
Chromosomal Variation ◽  
Blood Proteins ◽  
Electrophoretic Variation ◽  
South Eastern ◽  
Eastern Australia ◽  
South Eastern Australia

Geographic variation in potoroos (genus Potorous) from south-eastern Australia and Tasmania was investigated by electrophoretic and chromosomal techniques. Six of the 10 potoroo blood proteins examined showed electrophoretic variation and the genetic basis of three of these was established by breeding studies. Levels of genic heterozygosity were similar in Tasmanian and mainland populations. Coefficients of genetic similarity based on 10 loci indicated that potoroos from Tasmania and the Bass Strait islands are similar to each other but different from those of mainland Australia. No chromosomal variation was observed in potoroos examined from south-eastern Australia and Tasmania. Crosses between animals from these regions produced fertile offspring. It is concluded from this study and a related investigation on morphological variation that the genus Potorous should be separated into two species, P. platyops and P. tridactylus, with the further subdivision of the latter species into P.t. tridactylus from mainland Australia (including P. gilberti) and P.t. apicalis from Tasmania and the Bass Strait islands.

scholarly journals Natural Selection and the Maintenance of Colour Pattern Polymorphism in the Australian Plague Locust Chortoicetes terminifera

1983 ◽  
Vol 36 (4) ◽  
pp. 387 ◽  
Author(s):  
John M Dearn ◽  
Richard AH Davies
Keyword(s):  
Natural Selection ◽  
Random Mating ◽  
Colour Pattern ◽  
Differential Selection ◽  
Genotype Frequencies ◽  
Eastern Australia ◽  
Males And Females ◽  
Pattern Polymorphism ◽  
Australian Plague Locust ◽  
Dominant Genes

Twelve samples of C. termini/era from seven locations in eastern Australia were analysed for colour pattern polymorphism. Although there was heterogeneity between the samples the overall frequencies of the colour pattern genotypes were very similar. Males and females showed consistent differences in their genotype frequencies and this is presumed to reflect differential selection between the two sexes. A comparison between observed genotype frequencies and those expected under random mating and in the absence of selection revealed large differences. In particular, genotypes heterozygous for two dominant genes were consistently underrepresented. While these differences could result from non-random mating it is argued that they are more likely to be due to viability differences between the genotypes.

Geographic variation in advertisement calls of Crinia signifera (Anura:Myobatrachidae) in the Bass Strait area of south-eastern Australia

2005 ◽  
Vol 53 (4) ◽  
pp. 221 ◽  
Author(s):  
M. J. Littlejohn
Keyword(s):  
Geographic Variation ◽  
Dominant Frequency ◽  
Demographic Structure ◽  
Advertisement Calls ◽  
Call Duration ◽  
Sea Levels ◽  
South Eastern ◽  
South Central ◽  
Eastern Australia ◽  
Pattern Of Variation

The structure of recorded advertisement calls of a total of 176 males of Crinia signifera from eight localities on the south-eastern Australian mainland and Tasmania was investigated. On the basis of number of pulses per call (samples from all localities) and call duration adjusted to 13.0°C (samples from six localities), two geographic groups are recognised: (1) south-central Victoria, and (2) the extreme south-eastern mainland and Tasmania. This pattern of variation is postulated to reflect expansion of a differentiated Tasmanian stock on to the extreme south-eastern Australian mainland along the eastern sill of the Bassian Isthmus during the lower sea levels of the Late Pleistocene. Geographic variation in pulse rate (derived from number of pulses and call duration) was also considered because of its use in previous studies. The variation in dominant frequency in samples from five localities, adjusted for snout–vent length, does not conform to that for number of pulses and call duration, and is attributed to differences in demographic structure and recruitment.

Geographic Variation in an Australian Species of Chaoborus (Diptera: Culicidae)

1983 ◽  
Vol 31 (1) ◽  
pp. 15
Author(s):  
DH Colless
Keyword(s):  
Principal Component Analysis ◽  
Geographic Variation ◽  
Wing Length ◽  
Principal Component ◽  
Latitudinal Variation ◽  
Complex Character ◽  
Australian Species ◽  
South Eastern ◽  
Adult Wing ◽  
Eastern Australia

Populations of an unnamed species of Chaoborus vary geographically in south-eastern Australia, along what appears to be a north-south cline. At least five characters are involved: in the adult, wing length and the colour of the style of the male coxite; in the larva, overall size, a complex character that includes relative breadth of the head, and degree of development of oesophageal molars. The dimensional characters of the larva were synthesized by means of principal component analysis; they show significant regressions on temperature. Latitudinal variation in size also occurs in the mosquitoes Anopheles annulipes and Culex vigilax, illustrating the occurrence in Culicidae of something analogous to 'Bergman's Rule' (of homoiotherms).

scholarly journals Correction: Interspecific and Geographic Variation in the Diets of Sympatric Carnivores: Dingoes/Wild Dogs and Red Foxes in South-Eastern Australia

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0130241 ◽  
Author(s):  
Naomi E. Davis ◽  
David M. Forsyth ◽  
Barbara Triggs ◽  
Charlie Pascoe ◽  
Joe Benshemesh ◽  
...  
Keyword(s):  
Geographic Variation ◽  
Red Foxes ◽  
South Eastern ◽  
Eastern Australia ◽  
Sympatric Carnivores ◽  
Wild Dogs ◽  
South Eastern Australia

Systematics of the Egernia whitii species group (Lacertilia : Scincidae) in south-eastern Australia

2002 ◽  
Vol 50 (5) ◽  
pp. 439 ◽  
Author(s):  
Stephen C. Donnellan ◽  
Mark N. Hutchinson ◽  
Paula Dempsey ◽  
William S. Osborne
Keyword(s):  
Sensu Stricto ◽  
Species Group ◽  
The Other ◽  
Colour Pattern ◽  
Morphological Evidence ◽  
South Eastern ◽  
South Wales ◽  
Eastern Australia ◽  
Allelic Differences ◽  
South Eastern Australia

Allozyme electrophoresis was used to assess the taxonomic significance of colour pattern variation within and between populations of the Egernia whitii species group from 41 locations in south-eastern Australia. Analysis of the products of 39 presumed loci revealed that a minimum of three species are present in southern New South Wales among populations previously referred to Egernia whitii. Fixed allelic differences were maintained where pairs of species were sympatric. One of these three species is wide-ranging and is the one to which the name E. whitii is properly applied. The other two are more restricted ecologically and geographically and are described here as new. The three species are genetically and morphologically distinct from the other three eastern Australian members of the species group, E.�margaretae, E. modesta, and E. multiscutata. Genetic data and a review of the morphological evidence provide no support for the recognition of subspecies within either E. whitii (sensu stricto) or E. multiscutata.

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