Ontogenetic changes in the diet of the black-stripe minnow Galaxiella nigrostriata (Shipway, 1953) (Galaxiidae) and the salamanderfish Lepidogalaxias salamandroides (Mees, 1961) (Lepidogalaxiidae)
Gill, H.S. and Morgan, D.L. (2003) Ontogenetic changes in the diet of the black-stripe minnow Galaxiella nigrostriata (Shipway, 1953) (Galaxiidae) and the salamanderfish Lepidogalaxias salamandroides (Mees, 1961) (Lepidogalaxiidae). Ecology of Freshwater Fish, 12 (2). pp. 151-158.
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Similarities in the diets of larval, juvenile and adult black-stripe minnow (Galaxiella nigrostriata) and salamanderfish (Lepidogalaxias salamandroides), collected from ephemeral pools in south-western Australia during the mid-wet, late-wet and dry seasons, were assessed. During the mid-wet season, both intra- and interspecific competition for a diminishing food supply was minimised through differences in prey utilisation by the various developmental stages of both species. During the late-wet season, the pools contained only juvenile G. nigrostriata and juvenile and adult L. salamandroides, the diets of which were vastly different. A shift towards terrestrial fauna by G. nigrostriata and the ingestion of greater proportions of larger benthic prey taxa by L. salamandroides minimised interspecific competition for food at a time when densities of zooplanktors were rapidly declining. Timing differences in the onset of aestivation ensures that no interspecific competition for food occurs during the dry season.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||Centre for Fish and Fisheries Research
School of Biological Sciences and Biotechnology
|Publisher:||Blackwell Publishing Inc.|
|Copyright:||2003 Blackwell Munksgaard|
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