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RESEARCH ARTICLE

Annual secondary production of two estuarine mysid species (Mysidacea: Mysidae) inhabiting an intermittently closed estuary, south-eastern New Zealand

Adrian W. T. Lill A C , Gerard. P. Closs A , Candida Savage B and Marc Schallenberg A
+ Author Affiliations
- Author Affiliations

A Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand.

B Department of Marine Science, University of Otago, PO Box 56, Dunedin, New Zealand.

C Corresponding author. Email: gammylill@gmail.com

Marine and Freshwater Research 62(7) 823-834 https://doi.org/10.1071/MF10274
Submitted: 3 November 2011  Accepted: 29 March 2011   Published: 25 July 2011

Abstract

Estimates of secondary production are essential to understanding how communities function. Estimates of secondary production for key species such as mysids are scarce, especially in estuarine environments. There are no estimates for mysid production in intermittently closed estuaries in the world, and no estimates for endemic New Zealand mysids. The current study presents length–mass models for two mysid species (Tenagomysis chiltoni Tattersall, 1923 and T. novae-zealandiae Thomson, 1900) from the south-eastern coast of the South Island, New Zealand. Kaikorai Lagoon, a small intermittently closed estuary, supported a large average annual biomass of T. novae-zealandiae (861.77 mg m–2) and T. chiltoni (971.90 mg m–2). The Hynes average-cohort method was used with length–mass models to estimate the annual production of breeding populations of T. chiltoni and T. novae-zealandiae collected over a year in parts of the Kaikorai Lagoon. Compared with similar temperate ecosystems worldwide, the studied ecosystem indicated high annual production (11 328.8 mg m–2 year–1 and 6585.2 mg m–2 year–1) and turnover rates (P : B) (13.16 and 6.78) for T. novae-zealandiae and T. chiltoni, respectively. High annual secondary production may be due to relatively stable hydrological and food conditions found in intermittently closed estuaries, leading to dense stable populations that are maintained through much of the year.

Additional keywords: lagoon, length-weight relationships, Mysidae, secondary production.


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