Nutrient cycling and food web dynamics in the Southern California Bight: The microbial food web

1986 ◽  
pp. 274-288 ◽  
Author(s):  
F. Azam
Keyword(s):  
Nutrient Cycling ◽  
Food Web ◽  
Southern California ◽  
Southern California Bight ◽  
Microbial Food Web ◽  
Food Web Dynamics

scholarly journals Short-term variability in microbial food web dynamics in a shallow tidal estuary

2003 ◽  
Vol 31 ◽  
pp. 145-161 ◽  
Author(s):  
A Iriarte ◽  
I Madariaga ◽  
M Revilla ◽  
A Sarobe
Keyword(s):  
Food Web ◽  
Microbial Food Web ◽  
Short Term ◽  
Tidal Estuary ◽  
Food Web Dynamics ◽  
Short Term Variability

scholarly journals Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean)

2014 ◽  
Vol 11 (5) ◽  
pp. 6985-7028 ◽  
Author(s):  
U. Christaki ◽  
D. Lefèvre ◽  
C. Georges ◽  
J. Colombet ◽  
P. Catala ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Food Web ◽  
Bacterial Production ◽  
Microbial Food Web ◽  
Heterotrophic Nanoflagellates ◽  
Bacterial Respiration ◽  
Viral Production ◽  
Phytoplankton Blooms ◽  
Food Web Dynamics ◽  
Heterotrophic Production

Abstract. Microbial food web dynamics were determined during the onset of several spring phytoplankton blooms induced by natural iron fertilization off Kerguelen Island in the Southern Ocean (KEOPS2). The abundances of heterotrophic bacteria and heterotrophic nanoflagellates, bacterial heterotrophic production, bacterial respiration, and bacterial growth efficiency, were consistently higher in surface waters of the iron-fertilized sites than at the reference site in HNLC (high nutrient low chlorophyll) waters. The abundance of viral like particles remained unchanged, but viral production increased by a factor of 6 in iron-fertilized waters. Bacterial heterotrophic production was significantly related to heterotrophic nanoflagellate abundance and viral production across all sites, with bacterial production explaining about 70 and 85%, respectively, of the variance of each in the mixed layer (ML). Estimated rates of grazing and viral lysis, however, indicated that heterotrophic nanoflagellates accounted for a substantially higher loss of bacterial production (50%) than viruses (11%). Combining these results with rates of primary production and export determined for the study area, a budget for the flow of carbon through the microbial food web and higher levels during the early (KEOPS2) and the late phase (KEOPS1) of the Kerguelen bloom is provided.

scholarly journals Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean)

2014 ◽  
Vol 11 (23) ◽  
pp. 6739-6753 ◽  
Author(s):  
U. Christaki ◽  
D. Lefèvre ◽  
C. Georges ◽  
J. Colombet ◽  
P. Catala ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Food Web ◽  
Bacterial Production ◽  
Trophic Levels ◽  
Microbial Food Web ◽  
Heterotrophic Nanoflagellates ◽  
Viral Production ◽  
Phytoplankton Blooms ◽  
Food Web Dynamics ◽  
Heterotrophic Production

Abstract. Microbial food web dynamics were determined during the onset of several spring phytoplankton blooms induced by natural iron fertilization off Kerguelen Island in the Southern Ocean (KEOPS2). The abundances of heterotrophic bacteria and heterotrophic nanoflagellates, bacterial heterotrophic production, bacterial respiration, and bacterial growth efficiency, were consistently higher in surface waters of the iron-fertilized sites than at the reference site in HNLC (high nutrient low chlorophyll) waters. The abundance of virus-like particles remained unchanged, but viral production increased by a factor of 6 in iron-fertilized waters. Bacterial heterotrophic production was significantly related to heterotrophic nanoflagellate abundance and viral production across all sites, with bacterial production explaining about 70 and 85%, respectively, of the variance of each in the mixed layer (ML). Estimated rates of grazing and viral lysis, however, indicated that heterotrophic nanoflagellates accounted for a substantially higher loss of bacterial production (50%) than viruses (11%). Combining these results with rates of primary production and export determined for the study area, a budget for the flow of carbon through the microbial food web and higher trophic levels during the early (KEOPS2) and the late phase (KEOPS1) of the Kerguelen bloom is provided.

scholarly journals Interplay between the paradox of enrichment and nutrient cycling in food webs

2018 ◽  
Author(s):  
Pierre Quévreux ◽  
Sébastien Barot ◽  
Élisa Thébault
Keyword(s):  
Nutrient Cycling ◽  
Food Web ◽  
Food Webs ◽  
Trophic Level ◽  
Temporal Variability ◽  
Ecosystem Functioning ◽  
Nutrient Inputs ◽  
Primary Producers ◽  
Paradox Of Enrichment ◽  
Food Web Dynamics

AbstractNutrient cycling is fundamental to ecosystem functioning. Despite recent major advances in the understanding of complex food web dynamics, food web models have so far generally ignored nutrient cycling. However, nutrient cycling is expected to strongly impact food web stability and functioning. To make up for this gap, we built an allometric and size structured food web model including nutrient cycling. By releasing mineral nutrients, recycling increases the availability of limiting resources for primary producers and links each trophic level to the bottom of food webs. We found that nutrient cycling can provide a significant part of the total nutrient supply of the food web, leading to a strong enrichment effect that promotes species persistence in nutrient poor ecosystems but leads to a paradox of enrichment at high nutrient inputs. The presence of recycling loops linking each trophic level to the basal resources weakly affects species biomass temporal variability in the food web. Recycling loops tend to slightly dampen the destabilising effect of nutrient enrichment on consumer temporal variability while they have opposite effects for primary producers. By considering nutrient cycling, this new model improves our understanding of the response of food webs to nutrient availability and opens perspectives to better link studies on food web dynamics and ecosystem functioning.

Phytoplankton allelochemical interactions change microbial food web dynamics

2011 ◽  
Vol 56 (3) ◽  
pp. 899-909 ◽  
Author(s):  
Astrid Weissbach ◽  
Maria Rudström ◽  
Martin Olofsson ◽  
Christian Béchemin ◽  
John Icely ◽  
...  
Keyword(s):  
Food Web ◽  
Microbial Food Web ◽  
Food Web Dynamics

scholarly journals Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes

2020 ◽  
Author(s):  
Urania Christaki ◽  
Audrey Gueneugues ◽  
Yan Liu ◽  
Stéphane Blain ◽  
Philippe Catala ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Food Web ◽  
Microbial Food Web ◽  
Food Web Dynamics ◽  
Ocean Productivity
Sign in / Sign up

Export Citation Format

Share Document