scholarly journals Arsenic biotransformation potential of six marine diatom species: effect of temperature and salinity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Rimana Islam Papry ◽  
Kento Ishii ◽  
M. Abdullah Al Mamun ◽  
Sohag Miah ◽  
Kanako Naito ◽  
...  
Keyword(s):  
Marine Diatom ◽  
Effect Of Temperature ◽  
Diatom Species ◽  
Species Effect

New species of benthic marine diatoms (Bacillariophyta) from the Western Pacific islands of Guam and Yap

Phytotaxa ◽  
2021 ◽  
Vol 508 (3) ◽  
Author(s):  
CHRISTOPHER S. LOBBAN
Keyword(s):  
Pacific Islands ◽  
Central Area ◽  
Marshall Islands ◽  
Marine Diatom ◽  
Large Species ◽  
Diatom Species ◽  
Cell Interior ◽  
Pennate Diatom ◽  
The Western Pacific ◽  
Benthic Marine Diatoms

In the course of preparation of a major checklist for Yap and ongoing investigations into the benthic marine diatom flora of Micronesia, thirteen new araphid and raphid pennate diatom species have been recognized and are described here. Plagiogramma subatomus is even smaller than P. atomus and the pseudoseptum forms a box with only a small opening toward the cell interior. Licmophora romuli is similar in size and spathulate shape to L. remulus, but the majority of the striae in the lamina lack vimines. L. graphis is exceedingly delicate, pencil-shaped, with apical striae 60–70 in 10 µm. Divergita biformis and D. decipiens are straight species with striae biseriate on the margin, uniseriate on the valve face, differing in the shape and prominence of the sternum and the shape of the valve-face areolae. D. macinnisii (from Marshall Islands, but included here for comparison) is curved, again with the decussate areolar pattern on the mantle, but with single extended areolae along each side of the linear sternum. These characters slightly amend the diagnosis of the genus.  Thalassionema baculum is a very short member of the genus, linear and isopolar. Climaconeis tarangensis is curved and differs from C. riddleae in stria density and areola shape; C. minaegensis is straight, without a stauros or craticular bars, of intermediate length, 228–247 µm. First SEM observations of Climaconeis lorenzii are presented and an updated key to Climaconeis is appended. Parlibellus paschalis is a tube-dwelling species differing from P. delognei is lacking cuniculi and pores in the central area. P. waabensis is a relatively large species, possibly tube-dwelling, that differs from P. delognei in shape and spacing of central striae and from P. berkeleyi in width and stria density. Pleurosigma simulacrum differs in ultrastructural details from P. intermedium. Lastly, Nitzschia tarangensis is a conopeate species, spathulate in profile with ribs along the edge of the valve depression and bordering the raphe, and with pores in the peri-raphe zone.

Toxicities of Irgarol 1051 derivatives, M2 and M3, to two marine diatom species

2019 ◽  
Vol 182 ◽  
pp. 109455 ◽  
Author(s):  
Amy Q. Zhang ◽  
Guang-Jie Zhou ◽  
Michael H.W. Lam ◽  
Kenneth M.Y. Leung
Keyword(s):  
Marine Diatom ◽  
Diatom Species ◽  
Irgarol 1051

scholarly journals Levels of Diatom Minor Sterols Respond to Changes in Temperature and Salinity

2020 ◽  
Vol 8 (2) ◽  
pp. 85 ◽  
Author(s):  
Ana Cristina Jaramillo-Madrid ◽  
Justin Ashworth ◽  
Peter J. Ralph
Keyword(s):  
Human Health ◽  
Phaeodactylum Tricornutum ◽  
Thalassiosira Pseudonana ◽  
Eukaryotic Cells ◽  
Effect Of Temperature ◽  
Diatom Species ◽  
Adaptive Traits ◽  
Chaetoceros Muelleri ◽  
Diverse Range ◽  
The Relationship

Diatoms are a broadly distributed and evolutionarily diversified group of microalgae that produce a diverse range of sterol compounds. Sterols are triterpenoids that play essential roles in membrane-related processes in eukaryotic cells. Some sterol compounds possess bioactivities that promote human health and are currently used as nutraceuticals. The relationship between sterol diversity in diatoms and their acclimation to different environments is not well understood. In this study, we investigated the occurrence of different sterol types across twelve diatom species, as well as the effect of temperature reduction and changes in salinity on the sterol contents of three model diatom species. In the diatoms Thalassiosira pseudonana, Phaeodactylum tricornutum and Chaetoceros muelleri, we found that changes in the relative contents of minor sterols accompanied shifts in temperature and salinity. This may be indicative of acquired adaptive traits in diatom metabolism.

Effect of temperature on changes in size and morphology of the marine diatom, Ditylum brightwellii (West) Grunow (Bacillariophyceae)

2013 ◽  
Vol 135 ◽  
pp. 128-136 ◽  
Author(s):  
Seung Won Jung ◽  
Seok Jae Youn ◽  
Hyeon Ho Shin ◽  
Suk Min Yun ◽  
Jang-Seo Ki ◽  
...  
Keyword(s):  
Marine Diatom ◽  
Effect Of Temperature ◽  
Ditylum Brightwellii ◽  
Size And Morphology

Interaction between zinc and freshwater and marine diatom species: Surface complexation and Zn isotope fractionation

2006 ◽  
Vol 70 (4) ◽  
pp. 839-857 ◽  
Author(s):  
A. Gélabert ◽  
O.S. Pokrovsky ◽  
J. Viers ◽  
J. Schott ◽  
A. Boudou ◽  
...  
Keyword(s):  
Isotope Fractionation ◽  
Surface Complexation ◽  
Marine Diatom ◽  
Diatom Species

scholarly journals Reproduction and respiration of a climate change indicator species: effect of temperature and variable food in the copepod Centropages chierchiae

2013 ◽  
Vol 35 (5) ◽  
pp. 1046-1058 ◽  
Author(s):  
Joana Cruz ◽  
Susana Garrido ◽  
Marta S. Pimentel ◽  
Rui Rosa ◽  
A. Miguel P. Santos ◽  
...  
Keyword(s):  
Climate Change ◽  
Indicator Species ◽  
Effect Of Temperature ◽  
Species Effect

Phytolith and diatom evidence for rice exploitation and environmental changes during the early mid-Holocene in the Yangtze Delta

2016 ◽  
Vol 86 (3) ◽  
pp. 304-315 ◽  
Author(s):  
Xinxin Zuo ◽  
Houyuan Lu ◽  
Zhen Li ◽  
Bing Song ◽  
Deke Xu ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Environmental Changes ◽  
Climatic Changes ◽  
Climatic Conditions ◽  
Marine Diatom ◽  
Diatom Species ◽  
Yangtze Delta ◽  
Apparent Correlation ◽  
The Ideal

AbstractUsing phytolith analysis from a well-dated and high-resolution sediment sequence in the apex of northern Yangtze Delta, we investigate environmental changes, the rise and decline of rice exploitation and possible impacts of environment on rice exploitation during the early mid-Holocene. The phytolith sequence documents a relatively warm and dry interval during ca.9000 to 8200 cal yr BP, followed by climatic amelioration before 7200 cal yr BP. Phytolith evidence indicates that rice exploitation at the apex of northern Yangtze Delta began at 8200 cal yr BP, flourished by 7700 cal yr BP and ceased after 7400 cal yr BP. The first emergence of marine diatom species approximately 7300 cal yr BP likely indicates an accelerated sea-level rise. The apparent correlation of the initiation of rice exploitation with climatic amelioration during the early mid-Holocene suggests that climatic changes may have played an important role in facilitating rice exploitation. Both the ideal climatic conditions and stable sea level enabled flourishing rice exploitation during 8200 to 7400 cal yr BP. Although the climate remained warm and wet after 7400 cal yr BP, local sea-level rise possibly led to the termination of earlier rice exploitation at this site of the northern Yangtze Delta.

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