Invertebrates, macroalgae, and chemical features in morainic ponds near Lakes Tekapo and Ohau, including new distribution records of Crustacea

Abstract

The invertebrates and macroalgae in 42 permanent and temporary ponds and kettles in glacial moraine south of Lake Ohau, and 36 sites in moraine west of Lake Tekapo, South Island, New Zealand, were sampled in December 1980, and taxonomic lists were compiled. Most organisms belonged to taxa characteristically found in shallow waters elsewhere in New Zealand, but new distributions for the rare cladocerans Neothrix armata, Monospilus dispar, and Ephemeroporus barroisi were recorded, and the presence of Simocephalus acutirostratus in New Zealand was confirmed. Darkly pigmented Daphnia carinata were recorded for the first time as also were co-occurring Boeckella triarticulata and Boeckella dilatata. Cluster analysis of the data from both areas identified 3 groups of taxa with a high probability of co-occurrence. Some species were absent from all the sites in 1 area but present at several sites in the other. This may reflect differences in adaptation to drought, or the limited sampling regime, but is also consistent with the areas being in different ecological districts. Ponds which still contained water in late autumn were sampled for pH (6.7-7.0), conductivity (K 20 , 17-79 µS cm ), and osmolality (21-37 mOsM).

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“…The species has also been identified from circumneutral ponds in New Zealand (pH 6.7-7) (Burns et al 1984). Nematodes and oligochaetes were the other abundant groups in the Group 2 wetlands during the present study but given their frequent occurrence in the other pH groupings, could not be considered characteristic of circumneutral conditions.…”

Biogeography and taxonomy of New Zealand Cladocera (Anomopoda, Chydoridae): a review

“…Pleuroxus, Chydorus, Alona and Biapertura, have an (Burns et al 1984). For Australian chydorid cladocerans please refer to Shiel & Dickson (1995) in detail.…”

“…However, the species documented in New Zealand lakes may not be correct. For example, Burns et al (1984) reported the distribution of Ephemeroporus barroisi Richard, 1894 in a New Zealand lake (Fig. 1).…”

Review of the status, distribution, and conservation of freshwater invertebrates in New Zealand

“…In addition to these and other insect species that were undescribed at that time, over 188 species of Crustacea , 32 species of Mollusca (Winterbourn 1973a;Powell 1979), and representatives of several less well-known groups including the Annelida (Winterbourn 1969;Brinkhurst 1971;Mason 1974), Platyhelminthes (Percival 1945), and Nemertea (Moore & Gibson 1973) are known to spend part or all of their lives associated with fresh water. Habitats colonised by these invertebrates include wetlands and seepages (e.g., Winstanley & Rowe 1980;McLellan 1988); rivers and streams (e.g., Winterbourn 1987 and references therein);lakes, ponds, tarns, andkettleholes (e.g., Forsyth 1978;Timms 1983;Burns et al 1984); cold water springs (e.g., Michaelis 1977); geothermally influenced waters (e.g., Winterbourn 1968;James 1985;; and underground waters in aquifers and caves (e.g., Alexander 1962;Sinton 1985).…”