摘要:

Water column integrated productivity of phytoplankton in three water masses east of New Zealand (Subtropical, Subtropical Convergence, and Subantarctic) varied both seasonally and spatially, ranging across two orders of magnitude. Productivity was highest in spring and autumn, and lowest in winter. Subtropical and Convergence waters were generally more productive than Subantarctic waters, but during summer the 2–3‐fold range of production was similar in each of the three water masses. Multiple regression analysis identified that most of the variability in production was associated with differences in integrated chlorophyllaconcentrations (56%). By considering both surface chlorophyllaand incident irradiance we derived a relationship which explained 74% of observed spatial and seasonal variability in integrated production. These surface variables can be sensed remotely, suggesting the potential for broad spatial mapping of the seasonal cycles of production in these water masses in the New Zealand Exclusive Economic Zone (NZEEZ). Further analysis of the relationship identified that most of the remaining variability could be attributed topbopt(a temperature‐dependent photo‐adaptive term). Exceptions to the relationship and the application of productivity models within NZEEZ are discussed.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516890

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Gonad development, seasonal changes in gonad activity, and size at maturity were investigated in female and male yellowtail kingfish (Seriola lalandi;Carangidae) collected from New South Wales, Australia between August 1995 and June 1996. Kingfish displayed peak gonad activity in December suggesting a summer spawning period. Males matured at smaller sizes than females. Females first matured at 698 mm fork length (FL) and 3+ years, but 50% maturity was not attained until 834 mm FL. The smallest recorded mature male was 360 mm FL and the estimated size at which 50% of males were mature was 470 mm FL (0+ years). Many female fish are harvested prior to first reproduction, but the impact of this on the stock remains unclear.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516891

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Sediment macrobenthos of the Upper Otago Harbour, south‐eastern New Zealand, was surveyed in 1993. Replicate samples (0.1 m2sieved on 1 ‐mm mesh) were taken using a diver‐operated suction sampler from 15 stations, including some suspected to be contaminated. Multivariate analysis of abundance data was used to examine patterns of benthic community structure and their relationship to environmental variables: sediment grain size, organic content, heavy metal concentration (V, Cr, Mn, Co, Ni, Cu, Zn, Cd, Pb), sea‐floor temperature, dissolved oxygen concentration, water depth, and macro‐algal content. Samples from Sawyers Bay, an area previously identified as impacted by sewage and industrial waste, were set apart from all other stations. A combination of percent sand, macro‐algal content, water depth, and chromium concentration correlated best with the observed community structure.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516892

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Two new species of macrourid fishes of the genusCoryphaenoidesfrom New Zealand are described.Coryphaenoides dossenusn. sp. is widespread on the continental slope at 480–1464 m and shows sexual dimorphism with the largest male about half the length of the largest female. It is also known from the Tasman Sea, Coral Sea, Indian Ocean, and the eastern side of the Atlantic Ocean south of c. 6° S.Coryphaenoides microstomusn. sp. is known only from four specimens collected from a single station at 1550–1720 m off the east coast of the North Island, New Zealand.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516893

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Scampi (Metanephrops challengeriBalss, 1914) support a significant fishery in New Zealand waters. Allozyme analysis of samples from four fishery areas found a low level of genetic variation but significant heterogeneity in allele frequencies. There were significant differences between samples from the Auckland Island Shelf and those from mainland New Zealand at three loci, but only one locus showed heterogeneity among mainland samples.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516894

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The phytoplankton community of the Putemun Channel (southern Chile) and its correlation with some environmental variables is analysed in this paper. Samples were collected on a monthly basis from May 1991 to May 1993. A total of 121 phytoplanktonic species were identified. The phytoplankton cell abundance ranged between 3.5 × 104cells/litre and 11.2 × 106cells/litre. The phytoplankton community was characterised by the dominance of diatoms. An inverse relationship between temperature and species diversity was observed. A significant correlation, after excluding tychoplank‐tonic benthic forms, was found between chlorophylla, cell abundances, and temperature. The influence of biotic and abiotic variables on oyster (Ostrea chilensis(Philippi 1845)) growth was analysed. The instantaneous growth rate was found to be positively correlated with both temperature and phytoplankton abundance, whereas significant negative correlation between growth and amount of particulate inorganic matter was found.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516895

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

I report on a group of orca (Orcinus orca(Linnaeus, 1758)) near the Bay of Islands, New Zealand, which were a lighter coloration than orca usually seen in these waters. Differences in pigmentation included a light grey caudal peduncle area and a dorsal cape, which has previously only been described for Antarctic orca. The size and shape of the eye patches were not consistent with orca photo‐identified in New Zealand. I suggest that this group of orca, although observed in New Zealand waters, were of Antarctic origin.

ISSN:0028-8330    

DOI:10.1080/00288330.1999.9516896

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor