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Fish response to the temporal hierarchy of the natural flow regime in the Daly River, northern Australia

Stewart-Koster, B., Olden, J. D., Kennard, M. J., Pusey, B. J., Boone, E. L., Douglas, Michael M. and Jackson, S. (2011). Fish response to the temporal hierarchy of the natural flow regime in the Daly River, northern Australia. Journal of Fish Biology,79(6):1525-1544.

Document type: Journal Article

IRMA ID 82057923xPUB130
Title Fish response to the temporal hierarchy of the natural flow regime in the Daly River, northern Australia
Author Stewart-Koster, B.
Olden, J. D.
Kennard, M. J.
Pusey, B. J.
Boone, E. L.
Douglas, Michael M.
Jackson, S.
Journal Name Journal of Fish Biology
Publication Date 2011
Volume Number 79
Issue Number 6
ISSN 0022-1112   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-82955162648
Start Page 1525
End Page 1544
Total Pages 20
Place of Publication United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
HERDC Category C1 - Journal Article (DIISR)
Abstract In this study, relationships between flow variation across multiple temporal scales and the distribution and abundance of three fish species, western rainbowfish Melanotaenia australis, sooty grunter Hephaestus fuliginosus and barramundi Lates calcarifer were examined at eight sampling reaches in the Daly River, Northern Territory, Australia. Discharge was highly seasonal during the study period of 2006-2010 with a distinct wet-dry discharge pattern. Significant catchment-wide correlations were identified between species abundance and hydrologic variables across several scales describing the magnitude and variability of flow. A Bayesian hierarchical model which accounted for >80% of variation in abundances for all species and age classes (i.e. juvenile and adult), identified the extent to which the influence of short-term flow variation was dependent upon the historical flow regime. There were distinct ontogenetic differences in these relationships for H. fuliginosus, with variability of recent flows having a negative effect on juveniles which was stronger at locations with higher historical mean daily flow. Lates calcarifer also displayed ontogenetic differences in relationships to flow variation with adults showing a positive association with increase in recent flows and juveniles showing a negative one. The effect of increased magnitude of wet-season flows on M. australis was negative in locations with lower historical mean daily flow but positive in locations with higher historical mean daily flow. The results highlighted how interactions between multiple scales of flow variability influence the abundance of fish species according to their life-history requirements.
Keywords Bayesian hierarchical model
Ecohydrology
Multiple scales
Ontogeny
Species abundance
DOI http://dx.doi.org/10.1111/j.1095-8649.2011.03072.x   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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