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Ogden, R.W., 1997. The effects of European settlement on the biodiversity of chydorid Cladocera in billabongs of the south-east Murray basin. Memoirs of the Museum of Victoria 56(2): 505-511 Assemblages of chydorid cladoceran headshields preserved in billabong sediments are analysed for changes in species abundance, richness and diversity from pre-European settlement to the present day. The fauna consists of at least 36 species. Species richness and diversity are lower in present day assemblages than before settlement, but this may be an artefact of increasing sedimentation rates. Although some species have declined markedly since European settlement, no definite extinctions have occurred. Chydorid Cladocera in billabongs may be pre-adapted to anthropogenic disturbance. Trends of decreasing abundance found in some species will need to be reversed if regional extinctions are to be avoided

The effects of European settlement on the biodiversity of chyorid Cladocera in billabongs of the southeast Murray basin