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Hydrological persistence and the ecology of dryland rivers

✍ Scribed by Puckridge, J.T. ;Walker, K.F. ;Costelloe, J.F.

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 273 KB
Volume: 16
Category: Article
ISSN: 0886-9375
DOI: 10.1002/1099-1646(200009/10)16:5<385::aid-rrr592>3.0.co;2-w

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✦ Synopsis

The flow regime of Cooper Creek, central Australia, is subject to a summer-monsoonal climate and aseasonal cycles associated with the El Nin ˜o-Southern Oscillation (ENSO). Analysis of a 48-year hydrograph indicates that floods tend to occur in clusters associated with La Nin ˜a episodes. The influence of ENSO is apparent in lagged correlations between discharge and values of the Southern Oscillation Index (SOI), and in measures of coherency derived from cross-spectrum analysis. Hydrological persistence is indicated by partial auto-correlations between floods in successive years. In a cluster of five floods over 1987-1991, cumulative effects were apparent in wetland habitat areas, in water temperature and transparency, and in the recruitment patterns of five fish species: Nematalosa erebi (Clupeidae), Hypseleotris klunzingeri (Gobiidae), Melanotaenia splendida tatei (Melanotaeniidae), Retropinna semoni (Retropinnidae) and Gambusia holbrooki (Poeciliidae). During serial floods, native fish appear to have a recruitment advantage over the exotic Gambusia. Hydrological persistence and its ecological correlates warrant consideration in research, planning and management, particularly in regard to the water resources of arid and semi-arid regions.

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