Taxonomic composition and structure of bryozoan-associated biofilms from Japan and New Zealand

2005 ◽  
pp. 69-82 ◽  
Author(s):  
J Scholz ◽  
J Kaselowsky ◽  
A Lauer ◽  
S Mawatari ◽  
G Gerdes
Keyword(s):  
New Zealand ◽  
Taxonomic Composition ◽  
Composition And Structure

scholarly journals Relationship between marine epilithic diatoms and environmental variables in oligotrophic bay, NE Mediterranean

2018 ◽  
pp. 223 ◽  
Author(s):  
DUBRAVKA HAFNER ◽  
ANA CAR ◽  
NENAD JASPRICA ◽  
TATJANA KAPETANOVIĆ ◽  
IRIS DUPČIĆ RADIĆ
Keyword(s):  
Taxonomic Composition ◽  
Diatom Community ◽  
Silicate Concentration ◽  
Factors Influencing ◽  
Composition And Structure ◽  
Infraspecific Taxa ◽  
Monthly Distribution ◽  
Ne Mediterranean ◽  
The Difference ◽  
Epilithic Diatom

The taxonomic composition and structure of a marine epilithic diatom community were sampled from the bottom of the two sites at monthly intervals from January to December 2011 in the small semi-enclosed oligotrophic Neum Bay in Bosnia and Herzegovina (Middle Adriatic). Altogether, 264 diatom taxa (species and infraspecific taxa) within 69 genera were identified. Among them, 149 and 203 taxa occurred in samples from the shallow (0.5 m depth) and deep (8 m depth) sites, respectively. The monthly distribution of most of the diatoms was irregular and high numbers of sporadic taxa were found. SIMPER analysis indicated that the difference between shallow and deep sites could be largely attributed to the frequently recorded diatom taxa and those with high percentage abundances. They were Halamphora coffeiformis, Caloneis excentrica, Cocconeis scutellum var. scutellum, Licmophora flabellata, Licmophora gracilis, Licmophora sp., Navicula abunda, Rhabdonema adriaticum, and Striatella unipunctata. Canonical Correspondence Analysis (CCA) showed that temperature, oxygen saturation (O2/O2′), silicate concentration (SiO4), and salinity were the most important factors influencing diatom community structure in the bay.

Polysaccharides from new zealand native plants: A review of their structure, properties, and potential applications

2020 ◽  
Author(s):  
Susan Carnachan ◽  
Tracey Bell ◽  
Simon Hinkley ◽  
Ian Sims
Keyword(s):  
New Zealand ◽  
Water Soluble ◽  
Composition And Structure ◽  
Structures And Properties ◽  
Wide Range ◽  
Potential Applications ◽  
Food Applications ◽  
Year 2000 ◽  
And Storage ◽  
Structure Properties

© 2019 by the authors. Licensee MDPI, Basel, Switzerland. Water-soluble, non-starch polysaccharides fromplants are used commercially in a wide range of food and non-food applications. The increasing range of applications for natural polysaccharides means that there is growing demand for plant-derived polysaccharides with different functionalities. The geographical isolation of New Zealand and its unique flora presents opportunities to discover new polysaccharides with novel properties for a range of applications. This review brings together data published since the year 2000 on the composition and structure of exudate gums, mucilages, and storage polysaccharides extracted from New Zealand endemic land plants. The structures and properties of these polysaccharides are compared with the structures of similar polysaccharides from other plants. The current commercial use of these polysaccharides is reviewed and their potential for further exploitation discussed.

Polysaccharides from new zealand native plants: A review of their structure, properties, and potential applications

2020 ◽  
Author(s):  
Susan Carnachan ◽  
Tracey Bell ◽  
Simon Hinkley ◽  
Ian Sims
Keyword(s):  
New Zealand ◽  
Water Soluble ◽  
Composition And Structure ◽  
Structures And Properties ◽  
Wide Range ◽  
Potential Applications ◽  
Food Applications ◽  
Year 2000 ◽  
And Storage ◽  
Structure Properties

© 2019 by the authors. Licensee MDPI, Basel, Switzerland. Water-soluble, non-starch polysaccharides fromplants are used commercially in a wide range of food and non-food applications. The increasing range of applications for natural polysaccharides means that there is growing demand for plant-derived polysaccharides with different functionalities. The geographical isolation of New Zealand and its unique flora presents opportunities to discover new polysaccharides with novel properties for a range of applications. This review brings together data published since the year 2000 on the composition and structure of exudate gums, mucilages, and storage polysaccharides extracted from New Zealand endemic land plants. The structures and properties of these polysaccharides are compared with the structures of similar polysaccharides from other plants. The current commercial use of these polysaccharides is reviewed and their potential for further exploitation discussed.

STRUCTURE OF TRILOBITE COMMUNITIES ALONG A DELTA-MARINE GRADIENT (LOWER ORDOVICIAN; NORTHWESTERN ARGENTINA)

Palaios ◽  
2021 ◽  
Vol 36 (2) ◽  
pp. 39-52
Author(s):  
FERNANDA SERRA ◽  
DIEGO BALSEIRO ◽  
ROMAIN VAUCHER ◽  
BEATRIZ G. WAISFELD
Keyword(s):  
Taxonomic Composition ◽  
Ecological Niches ◽  
Marine Environments ◽  
Key Factors ◽  
Physiological Conditions ◽  
Marine Deposits ◽  
Shelf Slope ◽  
Composition And Structure ◽  
Lower Ordovician ◽  
Nested Structure

ABSTRACTThroughout their long history, trilobites occupied various ecological niches, colonizing a wide variety of marine environments. However, the paleoecology of this group is mostly based on shelf–slope environments and less is known about their distribution in marginal environments. To understand how trilobite communities respond to a deltaic influence, we studied changes in the taxonomic composition and structure of a diverse and well-known Lower Ordovician olenid-dominated fauna from the Argentine Cordillera Oriental along a delta–marine gradient. Cluster analysis revealed two distinct associations, and ordination analysis revealed a clear biotic gradient within each. The ecological structure and diversity trends of both associations follow a predictable response to a depth-related gradient. Impoverished communities with a highly nested structure characterize the lower offshore, whereas rich and even communities occur in the upper offshore. The trend towards higher diversity and greater taxonomic turnover in shallower environments corresponds to greater habitat heterogeneity. Towards the other extreme, only the ubiquitous genus Jujuyaspis was a successful colonizer in deltaic settings. This marked contrast with the more diverse and abundant assemblages of fully marine deposits indicates stressful physiological conditions in marginal-marine environments, where alternating and contrasting normal-marine to brackish-water conditions and high input of siliciclastic material were among the key factors controlling the distribution of these early trilobite communities.

Clearer than mud? Using environmental DNA to track historical shifts in lake communities.

2021 ◽  
Author(s):  
John Pearman ◽  
Laura Biessy ◽  
Georgia Thomson-Laing ◽  
Lizette Reyes ◽  
Claire Shepherd ◽  
...  
Keyword(s):  
New Zealand ◽  
Microbial Communities ◽  
Environmental History ◽  
Environmental Changes ◽  
Environmental Dna ◽  
Taxonomic Composition ◽  
Molecular Methods ◽  
Rrna Gene ◽  
Metabolic Potential ◽  
Dna And Rna

<p>A continuous record of environmental history is stored in lake sediments providing an avenue to explore current and historical lake communities. Traditionally paleolimnological methods have focussed on macroscopic indicators (e.g. pollen, chronomids, diatoms) to investigate environmental changes but the application of environmental DNA techniques has enabled the investigation of microbial communities and other soft bodied organisms through time. The ‘Our lakes’ health; past, present, future (Lakes380)’ project aims to combined traditional and molecular methods to explore shifts in biological communities over the last 1,000 years (pre-human arrival in New Zealand). Sediments cores have been collected from a wide diversity of lakes across New Zealand and 16S rRNA gene metabarcoding approaches of both DNA and RNA applied to reveal how microbial community changes across time and especially in response to the arrival of humans and associated changes to the landscape and lake environments. We further investigate the changes in inferred metabolic potential of the microbial communities as the taxonomic composition of the lake differs over time. Finally, we combine these novel molecular methods with hyperspectral scanning and pollen data to increase the knowledge of changes in lake communities and identifying the timing of changes in lake health. The combination of methodologies provides a greater understanding of the environmental history of lake systems and will help to inform management decisions relating to the restoration and protection of lake health.</p>

Diatomic flora of Lake Tikozero in the Holocene

2020 ◽  
pp. 24-31
Author(s):  
Anna L. Kosova ◽  
Dmitrii B. Denisov
Keyword(s):  
Preliminary Data ◽  
Taxonomic Composition ◽  
Eastern Coast ◽  
Benthic Species ◽  
Diatom Analysis ◽  
Composition And Structure ◽  
Murmansk Region ◽  
Littoral Species ◽  
Diatom Complexes ◽  
Alkaline Waters

Preliminary data of micropaleontological (diatom) study of sediments of Lake Tikozero located on the eastern coast of Lake Yokostrovskaya Imandra (Murmansk region) are presented. Based on the results of diatom analysis, the taxonomic composition and structure of diatom complexes were studied, the stages of the development of the ecosystem of the lake were established. The studied lake was characterized by the dominance of benthic forms and fouling in the composition of paleosocial communities. Upward in the column of sediments, there is a change in indicator groups with respect to pH: the proportion of acidophils decreases from 62% to 18%, and the proportion of alkaliphiles increases from 5% to 40%. A change in the dominant diatom complex was revealed: the acidophilic benthic species Brachysira zellensis (Grunow) Round & D.G. Mann is replaced by the littoral species Staurosira construens Ehrenberg, which prefers slightly alkaline waters.

Biostratigraphy of the upper jurassic of the Verkh-Tarskaya drilling area (South of Western Siberia in foraminifera)

2020 ◽  
Author(s):  
Ekaterina V. Zaychikova ◽  
Keyword(s):  
Western Siberia ◽  
Upper Jurassic ◽  
Taxonomic Composition ◽  
Composition And Structure

The study of the taxonomic composition of foraminifera in the wells of the Verkh-Tarskaya drilling area formed the basis of this study. This made it possible to clarify the content of the complexes and trace the zones and layers with foraminifera. The biostratigraphic characteristics of the middle oxfordian-lower volgian sediments are also presented in the work, and changes in the taxonomic composition and structure of foraminifera complexes from wells in the Verkh-Tarsky district.

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