Occurrence of thraustochytrids: the fungoid protists vis-a-vis marine macroalgae (seaweeds) along the coast of Goa, India

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Varada S. Damare ◽  
Estha T. Fernandes ◽  
Anjita A. Naik ◽  
Svetlana P. Cardozo ◽  
Vilda Borges ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Temporal Variation ◽  
Green Alga ◽  
Marine Macroalgae ◽  
Interactive Effects ◽  
Estuarine Water ◽  
Ulva Compressa ◽  
Pine Pollen ◽  
Dry Seasons ◽  
Seawater Samples

Abstract Thraustochytrids are fungoid protists ubiquitous in the marine environment and found to be associated with decaying macroalgae. Not much is known about their association with living macroalgae. Hence in the present study, different macroalgal samples were collected from various beaches of Goa to examine the presence of thraustochytrids during a four-year-long study. Brown, red and green algae were found to be substrata of thraustochytrids. Thraustochytrids were isolated on pine pollen baiting from 17 to 58% of the specimens. Thraustochytrids isolated from various macroalgae belonged to the genera Oblongichytrium, Schizochytrium, Ulkenia, and Thraustochytrium. Labyrinthula sp. was also found once on the green alga Bryopsis hypnoides. These were generally found during dry seasons rather than in monsoons. The seasonal occurrence of thraustochytrids was found to be associated with temporal variation in macroalgal diversity. The statistical analysis supported individual or interactive effects of both factors viz, seasons and macroalgal diversity, on the occurrence of thraustochytrids. Thraustochytrids were also isolated from seawater adjoining macroalgae and from estuarine water at all times of the year. Oblongichytrium sp. was isolated from the green alga Ulva compressa and Anjuna seawater samples at the same time, thus indicating that thraustochytrids from seawater could inhabit the macroalgae.

scholarly journals Future CO2-induced seawater acidification mediates the physiological performance of a green alga Ulva linza in different photoperiods

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7048 ◽  
Author(s):  
Furong Yue ◽  
Guang Gao ◽  
Jing Ma ◽  
Hailong Wu ◽  
Xinshu Li ◽  
...  
Keyword(s):  
Growth Rate ◽  
Ocean Acidification ◽  
Relative Growth Rate ◽  
Green Alga ◽  
Light Period ◽  
Interactive Effects ◽  
Photochemical Quenching ◽  
Green Tide ◽  
Relative Growth ◽  
Ulva Linza

Photoperiods have an important impact on macroalgae living in the intertidal zone. Ocean acidification also influences the physiology of macroalgae. However, little is known about the interaction between ocean acidification and photoperiod on macroalgae. In this study, a green alga Ulva linza was cultured under three different photoperiods (L: D = 8:16, 12:12, 16:8) and two different CO2 levels (LC, 400 ppm; HC, 1,000 ppm) to investigate their responses. The results showed that relative growth rate of U. linza increased with extended light periods under LC but decreased at HC when exposed to the longest light period of 16 h compared to 12 h. Higher CO2 levels enhanced the relative growth rate at a L: D of 8:16, had no effect at 12:12 but reduced RGR at 16:8. At LC, the L: D of 16:8 significantly stimulated maximum quantum yield (Yield). Higher CO2 levels enhanced Yield at L: D of 12:12 and 8:16, had negative effect at 16:8. Non-photochemical quenching (NPQ) increased with increasing light period. High CO2 levels did not affect respiration rate during shorter light periods but enhanced it at a light period of 16 h. Longer light periods had negative effects on Chl a and Chl b content, and high CO2 level also inhibited the synthesis of these pigments. Our data demonstrate the interactive effects of CO2 and photoperiod on the physiological characteristics of the green tide macroalga Ulva linza and indicate that future ocean acidification may hinder the stimulatory effect of long light periods on growth of Ulva species.

Behavior of Listeria monocytogenes at 7, 13, 21, and 35°C in Tryptose Broth Acidified with Acetic, Citric, or Lactic Acid

1989 ◽  
Vol 52 (10) ◽  
pp. 688-695 ◽  
Author(s):  
NORMAH AHAMAD ◽  
ELMER H. MARTH
Keyword(s):  
Acetic Acid ◽  
Lactic Acid ◽  
Statistical Analysis ◽  
Listeria Monocytogenes ◽  
Dissociation Constants ◽  
Interactive Effects ◽  
Lactic Acids

Inhibition of Listeria monocytogenes CA and V7 by of acetic, citric, and lactic acids at 7, 13, 21, and 35°C was investigated. Statistical analysis showed interactive effects between temperature, types, and concentration of acids and strains of the pathogen. Presence of up to 0.1% of acetic, citric and lactic acids in the medium (tryptose broth) inhibited growth; the degree of inhibition increased as the temperature of incubation decreased (no growth occurred in the presence of 0.1% acetic acid at 7°C). L. monocytogenes was inactivated at all temperatures when acid concentrations in the medium were 0.3% or greater. Acetic acid was most detrimental to L. monocytogenes followed in order by lactic and citric acids. The antilisterial activity of these acids coincided with their degree of undissociation. Citric and lactic acids, with larger dissociation constants, were less detrimental to the pathogen than was acetic acid.

scholarly journals Isolation and Characterization of Microsatellites in the Green Alga Ulva compressa (Chlorophyta)

CYTOLOGIA ◽  
2008 ◽  
Vol 73 (4) ◽  
pp. 387-392 ◽  
Author(s):  
Yayoi Kagami ◽  
Tatsushi Arai ◽  
Yuko Mogi ◽  
Kazuyoshi Kuwano ◽  
Shigeyuki Kawano
Keyword(s):  
Green Alga ◽  
Isolation And Characterization ◽  
Ulva Compressa

Physical and biogeochemical correlates of spatio-temporal variation in the δ13C of marine macroalgae

2015 ◽  
Vol 157 ◽  
pp. 7-18 ◽  
Author(s):  
Andrew P. Mackey ◽  
Glenn A. Hyndes ◽  
Matheus C. Carvalho ◽  
Bradley D. Eyre
Keyword(s):  
Temporal Variation ◽  
Marine Macroalgae ◽  
Spatio Temporal

scholarly journals Macroalgas de la laguna "El Carmen", Tabasco, México

2020 ◽  
Author(s):  
Graciela María Pérez Jiménez ◽  
Ma. Guadalupe Rivas-Acuña ◽  
Daniel León Álvarez ◽  
Bernardita Campos Campos ◽  
Nataly Quiroz-González
Keyword(s):  
Species Richness ◽  
Annual Cycle ◽  
Marine Algae ◽  
New Records ◽  
Coastal Lagoons ◽  
Sampling Time ◽  
The State ◽  
Marine Macroalgae ◽  
Ecological Knowledge ◽  
Dry Seasons

Resumen:Antecedentes y Objetivos: Debido a la escasez de conocimiento sobre macroalgas en lagunas costeras de Tabasco, en este trabajo se determina ladiversidad ficoflorística de macroalgas asociadas a la laguna El Carmen, municipio Cárdenas, y se contribuye al conocimiento biológico y ecológicoen el estado de Tabasco.Métodos: Se realizaron muestreos en un ciclo anual de 2015 a 2016 durante la época de lluvias, la de nortes y la de secas. Los organismos se recolectaronmanualmente, se fijaron con agua marina y formol al 4%, se identificaron y se depositaron en los herbarios FCME (UNAM) y UJAT.Resultados clave: Se reportan 21 especies de macroalgas marinas, tres de las cuales son nuevos registros para el estado de Tabasco. La divisiónRhodophyta con las familias Gracilariaceae y Rhodomelaceae tiene la mayor riqueza de especies; Gracilaria blodgetti fue la más abundante. Durantela temporada de nortes se registró la mayor riqueza y abundancia.Conclusiones: Se incrementó a 125 el número de registros de Rhodophyta y 28 de Ochrophyta para Tabasco. Se sugiere ampliar el número de muestreossistemáticos en un ciclo anual con la finalidad de tener una mejor representación de la diversidad y la estacionalidad de las macroalgas en lalaguna El Carmen.Palabras clave: algas marinas, diversidad, estacionalidad, laguna costera.Abstract:Background and Aims: Due to the lack of knowledge about macroalgae in Tabasco’s coastal lagoons, this work determined the macroalgae diversityassociated to the El Carmen lagoon, municipality Cardenas, and contributes to the biological and ecological knowledge of the state of Tabasco, Mexico.Methods: Three samplings were carried out in an annual cycle from 2015 to 2016, during the rainy, northern wind and dry seasons. The organismswere collected manually, fixated with seawater and 4% formalin, identified, and deposited in the UJAT and FCME (UNAM) herbaria.Key results: Twenty-one species of marine macroalgae were recorded, of which three are new records for the state of Tabasco. The Rhodophyta divisionwith the families Gracilariaceae and Rhodomelaceae had the highest species richness and Gracilaria blodgetti was the most abundant species.The greatest diversity and abundance appeared in the northern winds season.Conclusions: There is an increase to 125 species in the number of records of Rhodophyta species and 28 in the Ochrophyta for Tabasco. Hence, it issuggested to extend the sampling time and perform systematic work in an annual cycle, in order to have a better representation of the diversity andseasonality of the macroalgae in the El Carmen lagoon.Key words: coastal lagoon, diversity, marine algae, seasonality.

scholarly journals Assessment of long term interaction between the endemic seagrass P. oceanica and the exotic green alga C. cylindracea in the South Eastern coast of Spain (Murcia Region)

2015 ◽  
Author(s):  
Jaime Bernardeau-Esteller ◽  
Rocio García-Muñoz ◽  
Lázaro Marín-Guirao ◽  
Jose Miguel Sandoval-Gil ◽  
Ruiz Juan Fernandez
Keyword(s):  
Green Alga ◽  
Algal Growth ◽  
Interactive Effects ◽  
Limiting Factors ◽  
Eastern Coast ◽  
Future Research ◽  
The South ◽  
South Eastern ◽  
Leaf Canopy

The green alga Caulerpa cylindracea has rapidly spread throughout the Western Mediterranean during the last 20 years. Compared with other native benthic communities, Posidonia oceanica meadows seems to be highly resistant to the colonization by the alga. Nonetheless, it is suggested that in the long-term C. cylindracea could affect the seagrass altering its vitality, structure and functions, however little is known about the interactive effects between these two structuring species. To this end, the abundance of both macrophytes was quantified and monitored in invaded and non-invaded localities of the South Eastern coast of Spain (Murcia Region) over an 8-year period (2007-2014). Results indicate that no differences were highlighted between invaded and no invaded meadows and all the monitored meadows showed stable or progressive trends in shoot density, meadow cover and net population growth. Regardless of the depth, in all of the invaded localities C. cylindracea biomass present inside the seagrass leaf canopy was about 10 to 50–fold lower than that measured just outside the leaf canopy. In summary, our results do not support the existence of a long-term competitive interaction between the invasive alga and the native seagrass, at least in the studied meadows and at the meadow level. C. cylindracea forms huge biomass gradients associated to the seagrass meadow edges that are stable with time, which suggests the existence of highly limiting conditions for algal growth and survival under the P. oceanica leaf canopy. Future research on such limiting factors could help us to understand the invasive capacity of the alga and the factors involved in the resistance of native habitats to bioinvasions.

scholarly journals Effects of Whistle-Blowing Bans on Accidents at Gated Rail-Highway Crossings: The Northeastern Illinois Experience

2010 ◽  
Author(s):  
Paul Metaxatos ◽  
P. S. Sriraj ◽  
Siim Sööt ◽  
Joseph DiJohn
Keyword(s):  
Statistical Analysis ◽  
Interaction Effects ◽  
Interactive Effects ◽  
Metropolitan Region ◽  
Individual Factors ◽  
Whistle Blowing ◽  
Operational Characteristics ◽  
The Impact

This paper examines the effect of whistle-blowing bans on accidents at gated rail-highway public crossings in the Chicago metropolitan region. The statistical analysis show that it is rather misleading to unconditionally associate whistle bans with accident incidence and higher collision frequencies of rail-highway crossings while ignoring other factors or combinations of factors that are probably more relevant to the operational characteristics of the crossings. A deeper one delves into the interactive effects of crossing-specific characteristics on the number of accidents, the more the impact of individual factors becomes confounded so that interaction effects may even negate the effects of individual factors.

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