The effects of a headland eddy on surface macro-zooplankton assemblages North of Otago Peninsula, New Zealand

Murdoch, R.

doi:10.1016/0272-7714(89)90034-6

Cited by 36 publications

(31 citation statements)

References 31 publications

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“…a concentration, Fig. 2A-C), from water further offshore (Murdoch 1989). The two nearshore stations 1 and 2 were located on the nearshore shelf, the third at the edge of the shelf (Table 1).…”

Section: Hydrographymentioning

confidence: 99%

“…To address this possibility, I compared the hydrological and biological characteristics of the water masses identified by Jillett (1976) with particular attention to the band of low salinity water that results from mixing of the Southland Current and river systems. Satellite imagery identified the dispersal paths of suspended and dissolved material emanating from the Clutha River (mean flow 570 m- , and other rivers south of Otago, and the sharp deflection north of river discharges (Murdoch 1989;Hawke 1992).…”

Section: Introductionmentioning

confidence: 99%

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Some effects of river discharges and currents on phytoplankton in the sea off Otago, New Zealand

Haywood¹

2004

New Zealand Journal of Marine and Freshwater Research

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Major rivers on the south-eastern coast, South Island, New Zealand create plumes that are deflected north between the Southland Current and the coast. Surveys of the continental shelf water mass off the Otago coast over a 2-year period, May 1996-April 1998, confirmed that when the Southland Current surfaced it contained less chlorophyll a than mixed water subject to terrestrial influence, implying that river-borne nutrients stimulated primary production in the mixed water. The greatest boost occurred in winter when diatom abundance increased. The band of chlorophyll-rich water extended through the photic zone and was several kilometres wide suggesting that riverine influence on marine biomass is substantial. In summer, the Southland Current often lay beneath oceanic water, with no increase in chlorophyll a concentration in the overlying water, due possibly to heavy grazing by zooplankton. In summer 1997-98, seawater temperatures were higher and phytoplankton biomass lower than in summer 1996-97, consistent with a strong El Niño event in the Pacific Ocean.

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Section: Hydrographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Some effects of river discharges and currents on phytoplankton in the sea off Otago, New Zealand

Haywood¹

2004

New Zealand Journal of Marine and Freshwater Research

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“…For example the Southland Current, confined to the continental shelf, can be recognised by its contained fauna (Jillett 1976), whereas the eddy in the lee of Otago Peninsula acts to retain zooplankton, especially the larvae of benthic organisms (Murdoch 1989). Aggregation of Munida gregaria and small fish was discovered to be influenced by coastal fronts and internal waves (Zeldis & Jillett 1982;Kingsford & Choat 1986).…”

Section: Biological Oceanographymentioning

confidence: 99%

“…A theoretical exploration of the interaction of a variable mixed layer and picoplankton has begun (Kumar et al 1991); recent studies have provided data used in this model (e.g., James 1989;Vincent et al 1989). Work has also begun on the interaction of hoki larvae with this environment (Murdoch 1990;Murdoch etal. 1990).…”

Section: Biological Oceanographymentioning

confidence: 99%

Advances in New Zealand oceanography, 1967–91

Bradford‐Grieve¹,

Lewis²,

Stanton³

1991

New Zealand Journal of Marine and Freshwater Research

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“…Surface fronts occur where the lower salinity band meets more well-mixed coastal waters (O'Driscoll & McClatchie in press). The coastal circulation of the neritic water mass appears to play an important role in the advection and retention of zooplankton (Murdoch 1989), including krill (O'Driscoll & McClatchie in press).…”

Section: Introductionmentioning

confidence: 99%

Distribution of seabirds in coastal waters off Otago, New Zealand

O’Driscoll

Renner

Austin

et al. 1998

New Zealand Journal of Marine and Freshwater Research

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The occurrence, abundance, and distribution of seabirds was studied in a physically dynamic region off the coast of Otago, New Zealand. Eleven line-transect surveys were conducted in late summer and autumn of 1994-96, when surface swarms of "krill", Nyctiphanes australis, were present in the study area. Twenty species of seabird were recorded. The abundance and occurrence of species varied between sitting and flying counts. The most numerous species were sooty shearwaters (Puffinus griseus), red-billed gulls (Larus novaehollandiae), black-billed gulls (L. bulleri), and black-backed gulls (L. dominicanus). Most species were recorded throughout the study area, and different species were commonly observed together. Spatial similarity matrices revealed strongest association between red-and black-billed gulls and Received 6 October 1997; accepted 6 January 1998 black-backed gulls. The small (kilometre) scale distribution of seabirds varied between surveys, between transects, and between repeated runs of the same transect 1-3 h apart. Correlations between seabird abundance, salinity gradient, and krill density were weak. Counts of seabirds were highly positively skewed. This skewness, together with spatial and temporal variability in the distribution of flocks, would make abundance estimation at sea difficult. M97060

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The effects of a headland eddy on surface macro-zooplankton assemblages North of Otago Peninsula, New Zealand

Cited by 36 publications

References 31 publications

Some effects of river discharges and currents on phytoplankton in the sea off Otago, New Zealand

Some effects of river discharges and currents on phytoplankton in the sea off Otago, New Zealand

Advances in New Zealand oceanography, 1967–91

Distribution of seabirds in coastal waters off Otago, New Zealand

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