|Soft-bottom macrobenthic communities of Manukau Harbour, New Zealand|
Grange, K.R. (1979). Soft-bottom macrobenthic communities of Manukau Harbour, New Zealand. N.Z. J. Mar. Freshwat. Res. 13(3): 315-329
In: New Zealand Journal of Marine and Freshwater Research. Royal Society of New Zealand: Wellington. ISSN 0028-8330; e-ISSN 1175-8805
Aquatic communities > Benthos > Zoobenthos
Composition > Community composition
A survey of the macrobenthos at 42 stations in the channels and subtidal sandflats revealed 4 biotic associations; the communities are not particularly discrete and there is some overlap in species composition. Dominant species in each of the 4 groups of stations were ranked by calculating a 'community score' for each, based on its abundance, fidelity, and bioindex value within the group. Each of the 4 groups was found to support a unique group of species and these are considered as representing 4 communities. Two indicator species in each community were identified from the highest community scores: Group 1, the Microcosmus/Notomithrax community - associated with a coarse sediment of dead bivalve shells and small rocks in shallow water. It has high species diversity indices; Group 2, the Halicarcinus/Bugula community - associated with a relatively coarse sediment of dead shells, grit, and little sand in deep water in the main channels; Group 3, the Amalda/Myadora community - associated with fine sand with mud or shell grit in shallow parts of the channels; and Group 4, the Fellaster/Pagurus community - associated with ironsand in shallow water in the outer harbour. It has low species diversity indices.