New Zealand Journal of Marine and Freshwater Research abstracts
Short communication
Morphometric correlations and body mass regressions for Armandia maculata, Aglaophamus macroura (Polychaeta), and Zethalia zelandica (Gastropoda)
Brian Paavo
Benthic Science Limited
1 Porterfield Street
Macandrew Bay
Dunedin 9014, New Zealand
email: paavo@benthicscience.com
Agnès Ziegelmeyer
Erika Lavric
ENSIL
16 Rue d’Atlantis
Parc Ester Technopole
87068 Limoges CEDEX
France
P. Keith Probert
Department of Marine Science
University of Otago
P.O. Box 56
Dunedin, New Zealand
Abstract Armandia maculata and Aglaophamus macroura (Polychaeta) and Zethalia zelandica (Gastropoda) are abundant and conspicuous members of sandy sediment macrofaunal assemblages near dredge spoil disposal areas in southeast New Zealand. Regressions derived from data obtained by image analysis of preserved A. macroura specimens revealed that several dorsal width and area parameters of anterior chaetigers were related to total length (TL), estimated fresh weight (eFW), and ash-free dry weight (AFDW). Length measurements were less reliable. These findings allow the development of processing protocols which use fragmented material. Total area (regardless of orientation) was related to AFDW in Ar. maculata which rarely fragment in collections. Maximum shell width was an efficient predictor of AFDW for Z. zelandica. If chosen as indicator species, these regressions allow partial automation and rapid processing of material for disposal impact studies using biomass and demographic approaches.
Keywords biomass; dry weight; ash-free; image analysis; automated processing
New Zealand Journal of Marine and Freshwater Research, 2008, Vol. 42: 85–91
0028–8330/08/4201–0085 © The Royal Society of New Zealand 2008
M07046; Online publication date 11 March 2008
Received 2 October 2007; accepted 12 November 2007
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