The partitioning of zinc, manganese, cadmium and selenium within copepods in oceanic waters east of New Zealand

2005 ◽  
Vol 56 (1) ◽  
pp. 95
Author(s):  
Douglas S. Mackie ◽  
Keith A. Hunter
Keyword(s):  
New Zealand ◽  
Chemical Analysis ◽  
Trace Metal ◽  
Phosphorus Content ◽  
Water Masses ◽  
Calanoid Copepods ◽  
Austral Spring ◽  
Chemical Leaching ◽  
Positive Correlation ◽  
Elemental Associations

The partitioning of Zn, Mn, Cd and Se within mesozooplankton, mainly calanoid copepods, is reported for two geographically close but biogeochemically distinct water masses (subtropical (ST) and subantarctic (SA) waters) during a transect east of New Zealand in austral spring 1997. Particular attention was paid to avoiding sample contamination during collection, handling and chemical analysis by using trace metal clean techniques. Mesozooplankton underwent a sequential chemical leaching scheme to determine the degree and type of elemental associations within labile and refractory tissues. All four elements showed a positive correlation with the phosphorus content of each fraction indicating a consistent relationship to the amount of tissue dissolved in each fraction. Ratios of Cd : P and Zn : P in samples from SA waters were over twice those in ST waters. However, no significant differences were found between Mn : P and Se : P ratios for samples from the two water masses.

scholarly journals Spatial Distribution of Lichens in Metrosideros excelsa in Northern New Zealand Urban Forests

Diversity ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 170
Author(s):  
Gladys N. Benitez ◽  
Glenn D. Aguilar ◽  
Dan Blanchon
Keyword(s):  
Spatial Distribution ◽  
Species Richness ◽  
New Zealand ◽  
Lichen Species ◽  
Positive Correlation ◽  
Breast Height ◽  
Lichen Community ◽  
The North ◽  
The City ◽  
Lichen Flora

The spatial distribution of corticolous lichens on the iconic New Zealand pōhutukawa (Metrosideros excelsa) tree was investigated from a survey of urban parks and forests across the city of Auckland in the North Island of New Zealand. Lichens were identified from ten randomly selected trees at 20 sampling sites, with 10 sites classified as coastal and another 10 as inland sites. Lichen data were correlated with distance from sea, distance from major roads, distance from native forests, mean tree DBH (diameter at breast height) and the seven-year average of measured NO2 over the area. A total of 33 lichen species were found with coastal sites harboring significantly higher average lichen species per tree as well as higher site species richness. We found mild hotspots in two sites for average lichen species per tree and another two separate sites for species richness, with all hotspots at the coast. A positive correlation between lichen species richness and DBH was found. Sites in coastal locations were more similar to each other in terms of lichen community composition than they were to adjacent inland sites and some species were only found at coastal sites. The average number of lichen species per tree was negatively correlated with distance from the coast, suggesting that the characteristic lichen flora found on pōhutukawa may be reliant on coastal microclimates. There were no correlations with distance from major roads, and a slight positive correlation between NO2 levels and average lichen species per tree.

Breeding biology of the critically endangered Malherbe's parakeet on Maud Island, New Zealand, following the release of captive-bred individuals

2009 ◽  
Vol 57 (6) ◽  
pp. 433 ◽  
Author(s):  
Luis Ortiz-Catedral ◽  
Jonathan C. Kearvell ◽  
Mark E. Hauber ◽  
Dianne H. Brunton
Keyword(s):  
New Zealand ◽  
Clutch Size ◽  
Captive Breeding ◽  
Breeding Biology ◽  
Critically Endangered ◽  
Limiting Factor ◽  
Early Age ◽  
Small Islands ◽  
Austral Spring ◽  
Nesting Sites

We studied a population of the critically endangered Malherbe’s parakeet (Cyanoramphus malherbi), following the release of 62 captive-bred individuals on Maud Island, New Zealand, to identify and characterise nesting sites in a novel island environment. Previous work on Malherbe’s parakeets consisted of limited observations on remnant mainland populations. The age of breeding pairs on Maud Island was 7.2 ± 4.7 months and included both captive-bred individuals of the first release flock and individuals hatched on Maud Island within a year of the first release. Nests were found in hollows of mamaku (Cyathea medullaris), vacant nests of sacred kingfisher (Todiramphus sanctus), a hole in the ground and a hollow in a kohekohe (Disoxylum spectabile). Active nests were found in the austral spring, summer and autumn. Clutch size was 5 eggs. The fledging of three Malherbe’s parakeets was confirmed for one nest 43 days after hatching. Observations of newly fledged individuals around the island indicate that at least seven successful nesting attempts occurred. Consistent with other studies in Cyanoramphus parakeets, our results suggest that availability of nesting sites on small islands may not be a limiting factor for the establishment of additional populations of Malherbe’s parakeets via captive breeding and translocation. The formation of breeding pairs at an early age, the use of diverse nesting sites in regenerating vegetation, and the evidence of successful breeding shortly after release on an island represent encouraging prospects for the conservation of New Zealand’s rarest parakeet.

Nomenclature of Water Masses in the Tasman Sea

1959 ◽  
Vol 10 (1) ◽  
pp. 1 ◽  
Author(s):  
DM Garner
Keyword(s):  
New Zealand ◽  
Water Masses ◽  
Oceanic Water ◽  
East Central ◽  
Coral Sea ◽  
Tasman Sea

In a recent paper by Rochford (1957) on the identification and nomenclature of water masses in the Tasman and Coral Seas, three oceanic water masses of importance to New Zealand hydrology have been described as "Coral Sea", "Sub-Antarctic", and "East Central New Zealand". Reasons are advanced here to suggest that the origins proposed for these water masses may require modification.

scholarly journals Characterization of the Heavy Mineral Suite in a Holocene Beach Placer, Barrytown, New Zealand

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 86
Author(s):  
Hannah C. Wells ◽  
Richard G. Haverkamp
Keyword(s):  
New Zealand ◽  
Heavy Minerals ◽  
Sem Images ◽  
Density Fractions ◽  
Icp Ms ◽  
Wide Range ◽  
Ore Minerals ◽  
Grain Size Distributions ◽  
Elemental Associations

The placer deposit at Barrytown, New Zealand, has been worked for gold and is known for high levels of ilmenite that has not been exploited. Other heavy minerals are present but have not been well characterized, which is the purpose of this research. Sand grains were separated into the density fractions and the heavier fractions analyzed by laser ablation ICP-MS for elemental composition and by scanning electron microscopy (SEM) EDS in whole grains and polished sections. Grain size distributions were determined from SEM images of polished grain mounts. Elemental associations have been identified with different minerals. A wide range of ore minerals, or potential useful industrial minerals, have been shown to be present largely as individual sand grains. These include gold, ilmenite, garnet, zircon, monazite, allanite, uraninite, thorite, cassiterite, wolframite, scheelite, and columbite. The ilmenite contains many inclusions, consisting of silicates and phosphates and 100–400 ppm Nb. Scandium is found to be present in zircon at 100–600 ppm along with 3000 ppm Y. Monazite is depleted in Eu relative to chondrite and contains Ga and Ge at 1000–3000 ppm. Because the sand grains are mostly individual minerals, it is suggested that separation may be possible using a combination of density, electrostatic and magnetic methods to obtain almost pure mineral fractions. This knowledge should inform decisions on potential exploitation of the resource.

Xonotlite and rodingites from Wairere, New Zealand

1973 ◽  
Vol 39 (302) ◽  
pp. 233-240 ◽  
Author(s):  
J. P. O'Brien ◽  
K. A. Rodgers
Keyword(s):  
Optical Properties ◽  
New Zealand ◽  
Chemical Analysis ◽  
Metasomatic Process

SummaryXenoliths of eucritic gabbros in an alpine-serpentinite body at Wairere have been altered to rodingites and xonotlite about their margins by hydrothermal metasomatism at temperatures between 430–470°C A chemical analysis and the optical properties of the xonotlite are reported, the textures of the rocks are described, and the metasomatic process is discussed.

Sign in / Sign up

Export Citation Format

Share Document