Brief description
Differences in fish assemblage composition due to the impact of fragmentation in Logan-Albert River network.
Full description
Survey;Sampled 30 sites in 2011 Feb, June and Oct at 17-week intervals. These months represent three distinct seasons; 1) warm and wet, 2) cool and dry, 3) warm and dry. Fish assemblages were sampled using sweep-net electrofishing. At the end of each sample, fish >50 mm standard length were identified, measured (standard length) and released. The remaining fish (i.e. <50 mm length) were preserved in ethanol for identification in the laboratory and measurement of standard length.Gear;Smith-Root LR-24 electrofishing machine (Vancouver, Washington, USA) fitted with a 150 mm diameter anode ring set at 60–100 Hz, 2 m pulse width and variable output voltage (200–350 Volts dc) depending on water conductivity (measured with a TPS WP-81 meter (Brisbane, Australia) at the time of sampling).
Notes
Fish;Counted IdentifiedBarriers;Number of barriers between site and Logan estuary Number of passable barriers between site and Logan estuary Longitudinal distance between each site and nearest downstream barrier or the estuary mouth (km) Binary data matrix reachHydrological conditions;# of spells >99.5th percentile long term flow magnitude Mean, maximum and total duration of spells >99.5th percentile long term flow magnitude (days) Number of spells <50th percentile long term flow magnitude Mean, maximum and total duration of spells <50th percentile long term flow magnitude (days)Landscape;Distance from river mouth (km) Elevation (m) Stream order (1:250,000 scale)Reach scale hydraulics;Mean velocity:depth ratio CV velocity:depth ratio Intact riparian condition (%) Structural woody habitat (%)
Data time period: 02 2011 to 20 12 2011
Spatial Coverage And Location
text: South Coast, Logan-Albert, Brisbane, Pine-Caboolture, Maroochy, Noosa and Mary River catchments
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