Patterns of connectivity among populations of Cherax destructor (Decapoda: Parastacidae) in western Queensland, Australia

No Thumbnail Available
File version
Author(s)
Hughes, JM
Hillyer, MJ
Griffith University Author(s)
Primary Supervisor
Other Supervisors
Editor(s)
Ann Grant
Date
2003
Size
File type(s)
Location
License
Abstract

Freshwater organisms are often hypothesized to reflect the hierarchical nature of stream channels in the genetic structure of their populations. However, patterns of genetic structure are also affected by the dispersal mechanism of the particular species and the nature of the river channels. In this study, the genetic structure of a freshwater crayfish, known to have the ability for terrestrial dispersal, was examined in a habitat where stream structure and elevational differences across catchment boundaries are minimal. It was found that levels of connectivity among populations in the same catchment are high, suggesting either recent or contemporary dispersal among them. In contrast, almost no sharing of haplotypes across drainage boundaries indicates limited terrestrial dispersal across them. However, nested clade analysis indicated that, historically, there has been movement between drainages. It is suggested that populations in the Cooper and Murray-Darling were isolated in the past and that, more recently, recolonization has occurred in an east-west direction from the Murray-Darling to the Bulloo and from the Bulloo to the Cooper. These movements probably occurred in wetter times when whole catchments were flooded.

Journal Title
Marine and Freshwater Research
Conference Title
Book Title
Edition
Volume
54
Issue
5
Thesis Type
Degree Program
School
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement
Item Access Status
Note
Access the data
Related item(s)
Subject
Persistent link to this record
Citation
Collections