Genetic analysis of populations of north-western Australian fish species

1993 ◽  
Vol 44 (5) ◽  
pp. 673 ◽  
Author(s):  
MS Johnson ◽  
DR Hebbert ◽  
MJ Moran
Keyword(s):  
Allelic Variation ◽  
Aldehyde Oxidase ◽  
Allozyme Variation ◽  
Clinal Variation ◽  
Electrophoretic Study ◽  
Allelic Frequencies ◽  
Consistent Picture ◽  
Australian Fish ◽  
Western Australian ◽  
North Western

Allozyme variation was used to investigate the genetic structure of Lutjanus sebae, Lethrinus nebulosus, Lethrinus choerorynchus, and Epinephelus multinotatus, which are components of a multispecies fishery off north-western Australia. Samples of each species were obtained from five or six localities, over a total distance of 1400-2080 km. Allelic variation was found at 13-16 loci in each species. The consistent picture to emerge was one of little genetic subdivision in all four species, with average values of FST ranging from 0.003 in L. sebae to 0.012 in E. multinotatus. Although there was statistically significant variation in allelic frequencies in three of the species, there were no clear geographical groupings of populations. With the possible exception of clinal variation for aldehyde oxidase in E. multinotatus, all heterogeneity of allelic frequencies was within the range that could easily be due to within-generation effects of selection. Thus, the allozyme data are consistent with the view that there are extensive connections of populations over large distances. The electrophoretic study also confirmed that, contrary to suggestions in the literature, L. nebulosus, L. choerorynchus, and Lethrinus laticaudis are reproductively isolated species.

scholarly journals GENETIC DIFFERENTIATION BETWEEN GEOGRAPHICALLY DISTANT POPULATIONS OF DROSOPHILA MELANOGASTER

Genetics ◽  
1982 ◽  
Vol 101 (2) ◽  
pp. 235-256
Author(s):  
Rama S Singh ◽  
Donal A Hickey ◽  
Jean David
Keyword(s):  
Drosophila Melanogaster ◽  
Genetic Differentiation ◽  
Gene Frequency ◽  
Natural Populations ◽  
Allozyme Variation ◽  
Clinal Variation ◽  
Significant Genetic Differentiation ◽  
African Populations ◽  
Latitudinal Clines ◽  
North And South

ABSTRACT We have studied allozyme variation at 26 gene loci in nine populations of Drosophila melanogaster originating on five different continents. The distant populations show significant genetic differentiation. However, only half of the loci studied have contributed to this differentiation; the other half show identical patterns in all populations. The genetic differentiation in North American, European and African populations is correlated with the major climatic differences between north and south. These differences arise mainly from seven loci that show gene-frequency patterns suggestive of latitudinal clines in allele frequencies. The clinal variation is such that subtropical populations are more heterozygous than temperate populations. These results are discussed in relation to the selectionist and neutralist hypotheses of genetic variation in natural populations.

Seasonal variation in trachoma and bush flies in north-western Australian Aboriginal communities

2002 ◽  
Vol 30 (2) ◽  
pp. 80-83 ◽  
Author(s):  
Lyndon Da Cruz ◽  
Ian R Dadour ◽  
Ian L McAllister ◽  
Alistair Jackson ◽  
Tim Isaacs
Keyword(s):  
Seasonal Variation ◽  
Aboriginal Communities ◽  
Australian Aboriginal ◽  
Western Australian ◽  
North Western

Races and Populations of the Australian Pilchard, Sardinops neopilchardus (Steindachner)

1951 ◽  
Vol 2 (2) ◽  
pp. 179 ◽  
Author(s):  
M Blackburn
Keyword(s):  
New South ◽  
Boundary Zone ◽  
The South ◽  
South Eastern ◽  
South Wales ◽  
Cook Strait ◽  
Australian Fish ◽  
Port Jackson ◽  
Western Australian ◽  
Abundance Fluctuations

The evidence of taxonomic differentiation in the Australian pilchard is reviewed. Three major groups (called races), located respectively in eastern, south-eastern, and south-western Australian waters, are distinguished by differences in growth rate. The boundary zone of the two former is near the New South Wales-Victoria bolder, but it is not certain to which of the two latter races the South Australian fish belong. The two former races are sukdivided into smaller, more or less separate stocks (populations), which are distinguished mainly by differences in mean number of vertebrae and in abundance fluctuations. There are at least two such groups in the eastern race, which meet between Port Jackson and Jervis Bay, and at least two in the south-eastern race. The pilchards of Cook Strait, New Zealand, are probably distinct from those of any Australian locality.

Genetic structure of the western rock lobster, Panulirus cygnus, with the benefit of hindsight

1996 ◽  
Vol 47 (7) ◽  
pp. 889 ◽  
Author(s):  
AP Thompson ◽  
JR Hanley ◽  
MS Johnson
Keyword(s):  
Genetic Structure ◽  
Western Australia ◽  
Allozyme Variation ◽  
Genetic Homogeneity ◽  
Latitudinal Variation ◽  
Rock Lobster ◽  
Polymorphic Loci ◽  
Allelic Frequencies ◽  
Genetic Subdivision ◽  
Panulirus Cygnus

Allozyme variation was used to investigate the genetic structure of the western rock lobster, Panulirus cygnus, along the coast of Western Australia. The study involved genetic surveys in 1980 and 1994. The first survey showed strong suggestions of latitudinal variation at two polymorphic loci, EST and GPI, but these suggestions were statistically suspect. With the benefit of hindsight gained from 1980, the 1994 survey was designed to examine more directly the suggestion of latitudinal genetic subdivision in this species. No evidence of genetic subdivision was found at either the EST or the GPI locus. In addition, the average FST value over nine polymorphic loci was a very low 0.0002. The evidence is consistent with current interpretations that P. cygnus is a single, panmictic population. In contrast with this spatial genetic homogeneity, however, there were significant changes in allelic frequencies at the GPI locus between 1980 and 1994, indicating genetic differences among cohorts.

THE SYMBOLISM OF THE NORTH-WESTERN AUSTRALIAN ZIGZAG DESIGN

Oceania ◽  
1972 ◽  
Vol 42 (3) ◽  
pp. 223-238 ◽  
Author(s):  
C. G. von Brandenstein
Keyword(s):  
The North ◽  
Western Australian ◽  
North Western

Allozyme variation of the endangered Florida torreya (Torreyataxifolia)

1993 ◽  
Vol 23 (12) ◽  
pp. 2598-2602 ◽  
Author(s):  
Mark W. Schwartz
Keyword(s):  
Genetic Variation ◽  
Spatial Pattern ◽  
Genetic Information ◽  
Allelic Variation ◽  
Polymorphic Locus ◽  
Allozyme Variation ◽  
Soil Types ◽  
In The Wild ◽  
Apalachicola River ◽  
The 1950S

Torreyataxifolia Arn. is an endangered conifer restricted to ravine slopes along the Apalachicola River in northern Florida. The species began a decline in the 1950s that has resulted in fewer than 1500 trees remaining extant in the wild. Allelic variation was examined for 189 trees throughout its range. The species is characterized by low overall levels of genetic variation: seven of 20 loci were variable; each polymorphic locus had no more than two alleles; mean heterozygosity (He) was 0.064. Over 78% of this measured genetic variation was found within populations; no spatial pattern was detected in the remaining variation between populations within drainage regions, across drainage regions, or across soil types. This genetic information was used to plan tissue collection for a permanent offsite population.

Interpretation of the Scales of the Yellow-Eye Mullet, Aldrichetta forsteri (Cuvier & Valenciennes) (Mugilidae)

1957 ◽  
Vol 8 (1) ◽  
pp. 14
Author(s):  
JM Thomson
Keyword(s):  
Flank Region ◽  
Age And Growth ◽  
Straight Line ◽  
Mesh Selection ◽  
Australian Fish ◽  
Line Relationship ◽  
Western Australian ◽  
Posterior Sector

The yellow-eye mullet scale is of the typical percomorph type, feebly ctenoid in most cases, but cycloid in the mid-flank region, which provides the best scale for age and growth determinations. The annual "break" is more obvious in the posterior sector than in the anterior. Above a length of 5 cm (length to caudal fork) there is a straight-line relationship between increments in dimensions of scale and increments in length of the fish. The scales of Victorian and Tasmanian fish are smaller than those of Western Australian fish, which is in accord with the rather larger number of scales in eastern fish. The annual "breaks" become apparent in spring when growth recommences after the winter cessation. As western fish are winter spawners and eastern fish summer spawners, the age and size attained at the time of formation of tho annuli differs in the two stocks. Females grow faster than males. Lengths (cm) attained each winter average as follows: Year I II III IV V VI VII Western fish 11 18-19 24-25 29-32 32-35 38 39 Eastern fish 5 12-13 19-21 24-27 30 The Petersen method of modal progression gives rather higher readings in the first and second years, probably as a result of mesh selection.

The value of host and parasite identification for arripid fish

2011 ◽  
Vol 62 (1) ◽  
pp. 72
Author(s):  
Sarah R. Catalano ◽  
Kate S. Hutson ◽  
Rodney M. Ratcliff ◽  
Ian D. Whittington
Keyword(s):  
Parasite Species ◽  
Accurate Identification ◽  
Fish Family ◽  
Previous Record ◽  
Sustainable Resource Management ◽  
Infection Parameters ◽  
Host Identification ◽  
Australian Fish ◽  
Western Australian ◽  
Parasite Assemblages

Accurate identification of fishes and their parasites is fundamental to the development, management and sustainability of fisheries and aquaculture worldwide. We examined three commercially and recreationally exploited Australian arripid species (Pisces: Arripidae), namely Australian herring (Arripis georgianus), eastern Australian salmon (A. trutta) and western Australian salmon (A. truttaceus), to determine their metazoan parasite assemblages and infection parameters. We identified 49 parasite species including 35 new parasite–host records and recognised seven ambiguous parasite–host records in the literature, largely a consequence of unsubstantiated host identifications in previous studies. Morphological and molecular methods confirmed a new western extension for the range of A. trutta, ∼1000 km west of the previous record. Confusion about host identification and the range extension documented here has implications for the management of these economically important arripid species in southern Australian waters. Our examination of an endemic Australian fish family emphasises that accurate identification of fishes and their parasites is a fundamental pre-requisite for efficient and sustainable resource management.

Tropical inshore dolphins of north-western Australia: Unknown populations in a rapidly changing region.

2012 ◽  
Vol 18 (1) ◽  
pp. 56 ◽  
Author(s):  
Simon J Allen ◽  
Daniele D Cagnazzi ◽  
Amanda J Hodgson ◽  
Neil R Loneragan ◽  
Lars Bejder
Keyword(s):  
Western Australia ◽  
Ad Hoc ◽  
Bottlenose Dolphins ◽  
Urban Centre ◽  
The North ◽  
Dolphin Population ◽  
Population Sizes ◽  
Commonwealth Government ◽  
Western Australian ◽  
North Western

Australian Snubfin Orcaella heinsohni, Indo-Pacific Humpback Sousa chinensis and Indo-Pacific Bottlenose Dolphins Tursiops aduncus inhabit Australia’s tropical north-western coastline, a region undergoing extensive port development associated with the massive expansion of the oil, gas and mining industries. The current lack of data on dolphin population sizes or trends precludes impact assessments of developments on these protected species. Furthermore, the Western Australian and Commonwealth Government conservation listings of tropical inshore dolphins do not reflect their international listings. From April to July, 2010, we conducted ad hoc boat-based surveys (n=55) of inshore delphinids at seven sites across north-western Australia from Coral Bay in the south (23.1°S: 113.8°E) to Cable Beach in the north (17.9°S: 122.2°E). We documented the locations of these three species from which we obtained photoidentification and biopsy data, as well as reports of Australian Snubfin Dolphin sightings from researchers and community groups. The data from this limited field effort confirm that Indo-Pacific Humpback and Indo-Pacific Bottlenose Dolphins occur in the waters adjacent to each north-western Australian urban centre and show that the range of the Australian Snubfin Dolphin extends considerably further south-west than previously reported. Given the scale of coastal developments and the vulnerability of isolated cetacean populations to fragmentation or extirpation, assessments of the viability of dolphin populations are required. Our data suggest that the Australian Snubfin, Indo-Pacific Humpback and Indo-Pacific Bottlenose Dolphins need to be considered as likely to be impacted by coastal developments across north-western Australia.

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