scholarly journals Chroococcoid cyanobacteria: a significant component in the food web dynamics of the open ocean

1986 ◽  
Vol 28 ◽  
pp. 291-297 ◽  
Author(s):  
R Iturriaga ◽  
BG Mitchell
Keyword(s):  
Food Web ◽  
Open Ocean ◽  
Significant Component ◽  
Food Web Dynamics ◽  
Chroococcoid Cyanobacteria

Food-web dynamics in the Portuguese continental shelf ecosystem between 1986 and 2017: Unravelling drivers of sardine decline

2021 ◽  
Vol 251 ◽  
pp. 107259
Author(s):  
D. Szalaj ◽  
M.A. Torres ◽  
T. Veiga-Malta ◽  
M.M. Angélico ◽  
L. Sobrinho-Gonçalves ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Food Web ◽  
Food Web Dynamics

The distribution and abundance of viruses in the Southern Ocean during spring

2000 ◽  
Vol 12 (4) ◽  
pp. 414-417 ◽  
Author(s):  
Harvey Marchant ◽  
Andrew Davidson ◽  
Simon Wright ◽  
John Glazebrook
Keyword(s):  
Southern Ocean ◽  
Sea Ice ◽  
Surface Waters ◽  
Significant Relationship ◽  
Polar Front ◽  
Open Ocean ◽  
Bacterial Concentration ◽  
Viral Abundance ◽  
Chroococcoid Cyanobacteria ◽  
Bacterial Concentrations

The concentrations of viruses, bacteria, chroococcoid cyanobacteria and chlorophyll a were determined in surface waters of the Southern Ocean during spring. Viral concentrations declined southward from around 4 × 106 ml−1 near Tasmania to a minimum of around 1 × 106 ml−1 at the Polar Front. South of the Front, virus concentrations increased again, reaching around 4 × 106 ml−1 in the sea-ice zone south of 60°S. Bacterial concentration decreased southwards across the Southern Ocean from around 6.5 × 105 ml−1 near Tasmania to < 1.0 × 105 ml−1 in the sea-ice zone. Cyanobacteria accounted for < 8% of the prokaryotes. There was no significant relationship between viral abundance and eithercyanobacterial or chl a concentration. Viral and bacterial concentrations were not significantly correlated north (P {0.10 < r < 0.20}) or south (P {0.20 < r < 0.5}) of the Polar Front. The virus to bacteria ratio (VBR) was between 3 and 15 in the open ocean but varied between 15 and 40 in the sea-ice region. These virus concentrations and VBRs indicate that viruses are no less important in Southern Ocean ecosystems than elsewhere in the world's oceans.

scholarly journals Physiological characteristics and food-web dynamics of Synechococcus in Lakes Huron and Michigan

1991 ◽  
Vol 36 (2) ◽  
pp. 219-234 ◽  
Author(s):  
Gary L. Fahnenstiel ◽  
Hunter J. Carrick ◽  
Rodolfo Iturriaga
Keyword(s):  
Food Web ◽  
Physiological Characteristics ◽  
Food Web Dynamics

Trophic Generalists vs. Trophic Specialists: Implications for Food Web Dynamics in Post-Fire Streams

Ecology ◽  
1995 ◽  
Vol 76 (8) ◽  
pp. 2361-2372 ◽  
Author(s):  
Timothy B. Mihuc ◽  
G. Wayne Minshall
Keyword(s):  
Food Web ◽  
Food Web Dynamics

scholarly journals Changes in food web dynamics of low Arctic ponds with varying content of dissolved organic carbon

2018 ◽  
Vol 50 (1) ◽  
pp. S100016 ◽  
Author(s):  
Heather L. Mariash ◽  
Matteo Cazzanelli ◽  
Milla Rautio ◽  
Ladislav Hamerlik ◽  
Matthew J. Wooller ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Food Web ◽  
Food Web Dynamics ◽  
Arctic Ponds ◽  
Low Arctic

Spatiotemporal food web dynamics along a desert riparian-upland transition

Ecography ◽  
2009 ◽  
Vol 32 (2) ◽  
pp. 354-368 ◽  
Author(s):  
Candan U. Soykan ◽  
John L. Sabo
Keyword(s):  
Food Web ◽  
Food Web Dynamics

Food Web Dynamics in Stable Isotope Ecology

2003 ◽  
pp. 125-133 ◽  
Author(s):  
Andrew Cohen ◽  
Pieter Verburg ◽  
Robert Hecky ◽  
Catherine O'Reilly ◽  
Pierre-Denis Plisnier
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Food Web Dynamics ◽  
Stable Isotope Ecology ◽  
Isotope Ecology

scholarly journals Microbial food web dynamics along a soil chronosequence of a glacier forefield

2011 ◽  
Vol 8 (11) ◽  
pp. 3283-3294 ◽  
Author(s):  
J. Esperschütz ◽  
A. Pérez-de-Mora ◽  
K. Schreiner ◽  
G. Welzl ◽  
F. Buegger ◽  
...  
Keyword(s):  
Food Web ◽  
Microbial Communities ◽  
Food Webs ◽  
Litter Decomposition ◽  
Developmental Stages ◽  
Food Web Dynamics ◽  
Glacier Forefield ◽  
Microbial Food Webs ◽  
And Function ◽  
The 19Th Century

Abstract. Microbial food webs are critical for efficient nutrient turnover providing the basis for functional and stable ecosystems. However, the successional development of such microbial food webs and their role in "young" ecosystems is unclear. Due to a continuous glacier retreat since the middle of the 19th century, glacier forefields have expanded offering an excellent opportunity to study food web dynamics in soils at different developmental stages. In the present study, litter degradation and the corresponding C fluxes into microbial communities were investigated along the forefield of the Damma glacier (Switzerland). 13C-enriched litter of the pioneering plant Leucanthemopsis alpina (L.) Heywood was incorporated into the soil at sites that have been free from ice for approximately 10, 60, 100 and more than 700 years. The structure and function of microbial communities were identified by 13C analysis of phospholipid fatty acids (PLFA) and phospholipid ether lipids (PLEL). Results showed increasing microbial diversity and biomass, and enhanced proliferation of bacterial groups as ecosystem development progressed. Initially, litter decomposition proceeded faster at the more developed sites, but at the end of the experiment loss of litter mass was similar at all sites, once the more easily-degradable litter fraction was processed. As a result incorporation of 13C into microbial biomass was more evident during the first weeks of litter decomposition. 13C enrichments of both PLEL and PLFA biomarkers following litter incorporation were observed at all sites, suggesting similar microbial foodwebs at all stages of soil development. Nonetheless, the contribution of bacteria, especially actinomycetes to litter turnover became more pronounced as soil age increased in detriment of archaea, fungi and protozoa, more prominent in recently deglaciated terrain.

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