Circulation and sedimentation of suspended particulate matter in New Zealand fjords

Pickrill, R. A.

doi:10.1016/0025-3227(87)90003-x

Cited by 57 publications

(57 citation statements)

References 16 publications

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“…The total diatom abundance (5.67)10 6 Á29.58)10 6 valves/gds) in general was considerably lower compared with observations in surface sediments of Effingham Inlet and other Canadian fjords (Hay et al 2003). Pickrill (1987) described a similar trend of low diatom abundances in other New Zealand fjords. The main axis of the fjord was characterised by a gradient from limnic to marine diatom species with increasing diversity towards Malaspina Reach (Fig.…”

Section: Diatoms Dominate Plankton Remainsmentioning

confidence: 53%

“…Diatom distribution in fjord sediments, on the other hand, is mainly determined by processes that affect the valve structure, including dissolution, damage to the valves during digestion in zooplankton guts, and bioturbation in sediments (Berger 1976;Pickrill 1987). Water characteristics (EFD, Dtemperature) indirectly reflect the stratification of the silicarich LSL and nutrient-rich SL, and was the single most important category (explaining 20% variance; Fig.…”

Section: Interpretation Of Fjord Sedimentary Recordsmentioning

confidence: 99%

“…The phytoplankton composition of the water column has been described in relation to physical gradients, nutrients and phytoplankton community succession (Goebel 2001;Goebel et al 2005). However, to date, few studies have investigated the spatial distribution of microfossil and diatom assemblages in Fiordland surficial sediments (Pickrill 1987;Pickrill et al 1992), and no studies have documented sedimentary pigments in surface sediments in Fiordland.…”

Section: Introductionmentioning

confidence: 99%

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Spatial distribution of diatom and pigment sedimentary records in surface sediments in Doubtful Sound, Fiordland, New Zealand

Schüller

Savage

2011

New Zealand Journal of Marine and Freshwater Research

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Algal remains (pigment concentrations, diatom frustules) and organic matter sources (d 15 N, d13 C) in surface sediments (0Á2 cm) were quantified and related to environmental gradients in Doubtful Sound, Fiordland, New Zealand. Sedimentary pigment concentrations, in particular diatoxanthin and fucoxanthin (diatom biomarkers) were elevated near Malaspina Reach, which experiences greater incident irradiance and mixing of silica-rich freshwater with nutrient-rich marine water. In contrast, diatom frustules were recovered in low concentrations in deep basins including Malaspina Reach, most likely related to dissolution and grazing. Spatial variability in pigments in Doubtful Sound was mainly correlated with light conditions (incident irradiance, chromophoric dissolved organic matter). By contrast, diatoms were principally correlated with salinity gradients (effective freshwater depth) and water column stratification (mixing). This study highlights the importance of using complementary sedimentary proxies when reconstructing algal abundance and community composition in fjord environments.

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Section: Diatoms Dominate Plankton Remainsmentioning

confidence: 53%

Section: Interpretation Of Fjord Sedimentary Recordsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial distribution of diatom and pigment sedimentary records in surface sediments in Doubtful Sound, Fiordland, New Zealand

Schüller

Savage

2011

New Zealand Journal of Marine and Freshwater Research

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“…Steep topography and hard rock geology causes little precipitation to be absorbed. Consequently in the inner parts of the fiord there is a low-salinity layer (LSL) ranging up to 10 m depending on influx (Pickrill 1987;Gibbs et al 2000;Gibbs 2001). Additional freshwater input enters at Deep Cove, Site A (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…obs.). Winter surface temperatures occasionally fall below freezing, especially in Hall Arm (Pickrill 1987;Elliott pers. obs).…”

Section: Methodsmentioning

confidence: 99%

Acoustic monitoring of habitat use by bottlenose dolphins in Doubtful Sound, New Zealand

Elliott

Dawson

Henderson

2011

New Zealand Journal of Marine and Freshwater Research

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Passive acoustic methods are increasingly used to study cetacean habitat use and behaviour. The Timing Porpoise Detector (T-POD; www.chelonia.co.uk) is a self-contained acoustic data logger, which records echolocation by cetaceans. This study used nine T-PODs to document habitat use by bottlenose dolphins in Doubtful Sound, New Zealand, over a 12-month period, collecting data over 76,104 h (of a possible 78,840). T-POD records show that dolphin distribution varied seasonally, with inner fiord sites being used most often in summer and autumn, and outer fiord sites during winter and spring. This seasonal pattern was positively correlated with surface water temperature. Echolocation activity in general and buzzes, which are usually indicative of foraging, were both significantly more common during dawn and/or dusk, suggesting crepuscular foraging. T-POD data suggest that parts of the 'Dolphin Protection Zone', in which boat traffic is restricted, are used frequently while other parts are not, and provide a basis for refining this management tool.

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Carbon cycling and burial in New Zealand's fjords

Hinojosa

Moy

Stirling

et al. 2014

Geochem. Geophys. Geosyst.

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Understanding carbon cycling in continental margin settings is critical for constraining the global carbon cycle. Here we apply a multiproxy geochemical approach to evaluate regional carbon cycle dynamics in six New Zealand fjords. Using carbon and nitrogen concentrations and isotopes, lipid biomarkers, and redoxsensitive element concentrations, we show that the New Zealand fjords have carbon-rich surface sediments in basins that promote long-term storage (i.e., semirestricted basins with sediment accumulation rates of up to 4 mm yr 21 ). Using d 13 C distributions to develop a mixing model, we find that organic carbon in fjord sediments is well-mixed from marine and terrestrial sources in down-fjord gradients. This is driven by high regional precipitation rates of >6 m yr 21 , which promote carbon accumulation in fjord basins through terrestrial runoff. In addition, we have identified at least two euxinic subbasins, based on uranium, molybdenum, iron, and cadmium enrichment, that contain >7% organic carbon. Because the strength and position of the Southern Hemisphere westerly winds control precipitation and fjord circulation, carbon delivery and storage in the region are intimately linked to westerly wind variability. We estimate that the fjord region (759 km 2 ) may be exporting up to 1.4 3 10 7 kgC yr 21 , outpacing other types of continental margins in rates of carbon burial by up to 3 orders of magnitude.

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Circulation and sedimentation of suspended particulate matter in New Zealand fjords

Cited by 57 publications

References 16 publications

Spatial distribution of diatom and pigment sedimentary records in surface sediments in Doubtful Sound, Fiordland, New Zealand

Spatial distribution of diatom and pigment sedimentary records in surface sediments in Doubtful Sound, Fiordland, New Zealand

Acoustic monitoring of habitat use by bottlenose dolphins in Doubtful Sound, New Zealand

Carbon cycling and burial in New Zealand's fjords

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