Factors controlling summer phytoplankton production in greater Cook Strait, New Zealand

Bradford, Janet M.; Lapennas, P. P.; Murtagh, R. A.; Chang, F. Hoe; Wilkinson, Vaughan H.

doi:10.1080/00288330.1986.9516148

Cited by 49 publications

(33 citation statements)

References 30 publications

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“…Upwelling of nutrient rich water has been observed in Cook Strait during periods of north-westerly wind flow (Bradford et al 1986), in areas where young hoki occur in abundance ). South-westerly flow over the South Island can result in localised north-westerly flow through Cook Strait (Reid 1996), so either north-westerly or south-westerly conditions over the country could result in favourable conditions for young hoki in Cook Strait.…”

Section: Discussionmentioning

confidence: 99%

Links between climate variation and year class strength of New Zealand hoki(Macruronus novaezelandiae): An update

Bull¹,

Livingston²

2001

New Zealand Journal of Marine and Freshwater Research

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Hoki (Macruronus novaezelandiae Hector) year class strength (YCS) varies substantially from year to year. We examined associations between YCS and climate variables including the Southern Oscillation Index (SOI), satellite sea surface temperatures (SSTs), synoptic weather patterns, wind speeds, and the depth of the west coast, South Island, New Zealand, mixed layer. We evaluated the predictions of a model developed 2 years ago to predict YCS of the western and eastern New Zealand hoki stocks from similar climate variables. New predictive models were developed using updated data. Strong year classes of the western hoki stock were associated with cooler SSTs, a negative SOI, and westerly or south-westerly flow along the west coast of the South Island. We accordingly predict a moderately strong 1997 year class and weak 1998 and 1999 year classes for the western stock of hoki. The current model cannot predict eastern stock year class strengths with confidence.

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Section: Discussionmentioning

confidence: 99%

Links between climate variation and year class strength of New Zealand hoki(Macruronus novaezelandiae): An update

Bull¹,

Livingston²

2001

New Zealand Journal of Marine and Freshwater Research

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“…There has been no report of an established or prolonged upwelling of nutrient-laden subsurface waters in the STCZ about the south of New Zealand that might compare to the Cape Farewell feature at the north of the South Island (Bradford et al 1986). Our inspection of remotely sensed SST images of the region dating back to 1986 corroborate this statement, although it should be remembered that SST may not resolve upwelling in all instances.…”

Section: Possible Mechanisms To Produce Nutrientenriched Surface Watersmentioning

confidence: 99%

Oceanography of the Subtropical Convergence Zone around southern New Zealand

Butler

Butt

Lindstrom

et al. 1992

New Zealand Journal of Marine and Freshwater Research

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Seawaters of the Subtropical Convergence Zone around the south of New Zealand were surveyed concurrently by two research ships in May 1989. The general surface features of the region are depicted in remotely sensed images of sea-surface temperatures obtained at the time of the survey, and also from preceding years. Shipboard data, obtained underway and on station, are used to describe the water masses and frontal structures. Short-term variability is discussed where stations were re-occupied after an interval of several days. Apositive gradient of nutrient concentration was observed when proceeding from subtropical to subantarctic waters. This general trend is modified in coastal regions by freshwater run-off, and by mixing processes in open ocean waters. It is M91044

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“…In Cook Strait, upwelling of nutrient rich water along the NE coast of the South Island where young hoki are known to occur in abundance (Murdoch et al 1990), has been observed during periods of NW wind flow (Bradford et al 1986). It may be that because of the Cook Strait funnelling effect under conditions of SW flow, upwelling and productive conditions favourable to hoki also occur.…”

Section: Regression Equationmentioning

confidence: 99%

Links between climate variation and the year class strength of New Zealand hoki (Macruronus novaezelandiae) Hector

Livingston¹

2000

New Zealand Journal of Marine and Freshwater Research

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Hoki (Macruronus novaezelandiae)Hector year class strength (YCS) varies substantially from year to year. In this study, potential links between hoki YCS estimates for western and eastern stocks, and time series of the Southern Oscillation Index (SOI), satellite sea surface temperatures (SST), synoptic weather patterns, depth of the mixed layer (western stock only), and wind speeds are explored. The results indicate that favourable recruitment in the western stock is correlated with a negative SOI and associated conditions such as lower SSTs, early onset of deep water mixing and synoptic weather patterns that result in a higher incidence of southwest (SW) flow. Favourable recruitment in the eastern stock appears to be correlated with periods of westerly flow, particularly from the SW, but also the north-west (NW). Regression studies showed that when inter-correlation was minimised, 95% of the variation in YCS of the western stock was explained by four variables-SOI in autumn, the onset of winter mixing, SST in spring, and NW spring weather patterns. In the eastern stock, 88% of the variation in YCS was explained by SW and NW winter weather patterns and the average speed of SW winds in winter through Cook Strait. Although the underlying mechanisms are not proven, the climate variables which appear to be linked to favourable recruitment for both western and eastern stocks, also favour upwelling and the physical transportation of larval hoki from the spawning grounds into their respective inshore nursery areas. M99026

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Factors controlling summer phytoplankton production in greater Cook Strait, New Zealand

Cited by 49 publications

References 30 publications

Links between climate variation and year class strength of New Zealand hoki(Macruronus novaezelandiae): An update

Links between climate variation and year class strength of New Zealand hoki(Macruronus novaezelandiae): An update

Oceanography of the Subtropical Convergence Zone around southern New Zealand

Links between climate variation and the year class strength of New Zealand hoki (Macruronus novaezelandiae) Hector

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