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Zooplankton of Wellington Harbour, New Zealand

January

January

Sea temperatures vary between 17°C. and 19°C. The plankton volume is generally about 100cc, or more when Thalia democratica is abundant. Obelia geniculata occupies less than 10% of the volume, while Salpidae, especially Thalia page 20
Text-fig. 7.—The Plankton Calendar. The Annual Cycle of Dominant Species in the Wellington Harbour Zooplankton based on their numerical abundance per 20-minute Horizontal Plankton Tow in 1961, 1962 and 1963.

Text-fig. 7.—The Plankton Calendar. The Annual Cycle of Dominant Species in the Wellington Harbour Zooplankton based on their numerical abundance per 20-minute Horizontal Plankton Tow in 1961, 1962 and 1963.

page 21
Text-fig. 8.—Seasonal variation in the major faunal elements comprising the monthly mean settling volume of the Wellington Harbour plankton related to surface water temperature during 1961, 1962 and 1963. Based on 20-minute horizontal plankton tows.

Text-fig. 8.—Seasonal variation in the major faunal elements comprising the monthly mean settling volume of the Wellington Harbour plankton related to surface water temperature during 1961, 1962 and 1963. Based on 20-minute horizontal plankton tows.

page 22
Text-fig. 9.—Annual variation in the monthly maximum numbers of larval decapod crustacean species in the Wellington Harbour plankton. Based on 1961, 1962 and 1963.

Text-fig. 9.—Annual variation in the monthly maximum numbers of larval decapod crustacean species in the Wellington Harbour plankton. Based on 1961, 1962 and 1963.

page 23 democratica, make up over 40% of the volume of most samples. Hydromedusae make up about 20% of the volume. Pleurobrachia pileus is rare and may be absent. About one-third of the volume comprises larval Crustacea, with 33 decapod species recorded for this month. Of these the larvae of Jaxea sp. and Petrolisthes novaezelandiae are usually the most common, but other species are strongly represented.