摘要:

Bacterial numbers and production were measured in the upper water column in the winter and spring of 1993 in five water masses surrounding the South Island of New Zealand. Average bacterial numbers and production were found to be higher in spring (8.5 × 105cells ml−1and 0.20 mg m3h−1, respectively) than winter (5.5 × 105cells ml−1and 0.05 mg C m3h−1respectively). Bacterial production was strongly correlated with chlorophyllaand primary production(P <0.001) in spring but not in winter. Spring bacterial production and at 10 m depth averaged across 28 stations was 23% of primary production, and with a growth efficency of 40%, may have consumed up to 57% of primary production. Bacterial biomass was greater than phytoplankton biomass for 75% of the 10 m depth comparisons during winter sampling and 44% during the spring sampling. The bacterial biomass was found to represent 24.6–33.5% of the nitrogen in particulate organic matter (<200 μm) supporting the concept that in New Zealand oceanic water masses bacteria are of significant biogeochemical importance.

ISSN:0028-8330    

DOI:10.1080/00288330.1997.9516785

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Sea level and sea surface temperature variability at the Chatham Islands was investigated using data from 1992 to 1994. The study was aimed at testing the hypothesis that the Subtropical Convergence moves north and south of the islands and that the resulting (in phase) variations in sea level and satellite Sea Surface Temperature could be observed and hence used to reveal something about the temporal scales of these movements. Although variability at a variety of scales was observed there was little evidence for verification of the hypothesis. Sea level adjustment to changes in atmospheric pressure was found to be less than the conventional inverted barometer response, showing that local and/or remote wind forcing was contributing to the observed sea level variability. However no simple local remote forcing mechanism could be identified in the data. In contrast sea surface temperature anomalies were correlated with local meridional winds stress.

ISSN:0028-8330    

DOI:10.1080/00288330.1997.9516786

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The East Auckland Current (EAUC) was investigated in 1994–95 using data from three CTD surveys (conductivity, temperature, depth) and moored current meters. The strength and position of the EAUC was found to be highly variable with most of the current re‐circulating around an anticyclonic eddy north‐east of North Cape—the North Cape Eddy. The position and intensity of this eddy changed resulting in complex flow patterns with a south‐east flowing EAUC not always present as a contiguous feature. The current meter data showed a high level of mesoscale variability with low spatial coherence, suggesting that the along shore correlation length scale was c. 100 km in this current system. Near North Cape, a persistent but variable counter‐current was found inshore of the EAUC. To the south‐east a permanent anticyclonic East Cape Eddy found north of East Cape appears to dominate the flow field and the genesis of the East Cape Current.

ISSN:0028-8330    

DOI:10.1080/00288330.1997.9516787

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Harmful algal bloom (HAB) research and monitoring has traditionally been based on ecological and microbiological measurements which are laborious, time‐consuming, and reliant on experienced operators. Recent developments in oligonucleotide probe technology and immunofluorescence research have revealed several potential applications and techniques that may be transposable to laboratory and field‐based monitoring and research. Field trials are currently underway for fluorescent in situ hybridisation and sandwich hybridisation assays. The former is particularly suited for laboratory‐based research on harmful algal bloom (HAB) population dynamics and structure, whereas the sandwich hybridisation assays based on a portable robotics workstation, offers the potential of quick and reliable laboratory and possibly field‐based screening for HAB species. Initial development is underway for molecular beacons and the Qß replicase detection system, both offer the potential of simple and cost effective strategies for field‐based monitoring by people with minimal knowledge of molecular biology.

ISSN:0028-8330    

DOI:10.1080/00288330.1997.9516788

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0028-8330    

DOI:10.1080/00288330.1997.9516789

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor