New Zealand Journal of Marine and Freshwater Research abstracts

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MOINA SP. (CLADOCERA: MOINIDAE) IN A SEWAGE PLANT, WELLINGTON, REFERRED TO MOINA TENUICORNIS SARS, 1896 (NOTE)

I. L. VlDAL

Works Department, Wellington City Corporation, P.O. Box 2199, Wellington, New Zealand

Abstract A species of Moina from sewage ponds at Glenside, Wellington, New Zealand, is identifiable with Moina tenuicornis Sars, 1896, and distinguishable from Moina australiensis Sars, 1896 sensu stricto, in having rectangular sculpturing on the ephippium, ungrouped setae on the hind margin of the carapace, and in lacking a permanent supra-ocular depression. Because of wide variation in some diagnostic characters, possibly both taxa are conspecific. Some physical and chemical characteristics of the habitat are tabulated, since little is known of the ecological requirements of these morphologically similar species. Using mean values as a guide, the Glenside population of Moina tenuicornis favours a temperature in the vicinity of 20°c, a very slightly alkaline pH, a dissolved oxygen content in excess of 6mg/litre, a dissolved solid content of about 270 mg/litre, of which about half is organic and exerts a BOD5 of about 60 mg/litre, and suspended organic solids of about 150 mg/litre.

N.Z. Journal of Marine and Freshwater Research 7 (3) : 253-9.
Received for publication 10 April 1972; revision received 11 December 1972

PDF file of entire paper: medium quality (371K); (scanned from paper original: notes about this process)

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