New Zealand Journal of Marine and Freshwater Research abstracts

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Habitat use by juvenile lampreys (Geotria australis) in a large New Zealand river

D. J. Jellyman
G. J. Glova

National Institute of Water and Atmospheric
Research Limited
P.O. Box 8602
Christchurch, New Zealand
email: d.jellyman@niwa.cri.nz

Abstract   Ammocoetes (larvae) of Geotria australis Gray, were sampled in a large South Island, New Zealand, river during summer to determine their distribution and habitat associations. Ammocoetes were widely distributed along the length of the river, being present at 66 of the 95 sites sampled. They ranged in density from 0 to180 m^-2, and were associated with habitat type (mainly runs), overhead shade, and substrate features (depth or the proportion of fine sand). The amount of particulate organic matter was negatively correlated with ammocoete abundance.

Keywords   Geotria australis; lamprey; ammocoete; habitat; densities

M01072 Received 7 August 2001; accepted 12 December 2001; published 17 September 2002
New Zealand Journal of Marine and Freshwater Research, 2002, Vol. 36: 503-510
0028-8330/02/3603-0503 $7.00 © The Royal Society of New Zealand 2002

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