Seasonal Switching Between Relative Importance of Bottom-Up and Top-Down Control of Bacterial and Heterotrophic Nanoflagellate Abundance

1998 ◽  
Vol 78 (3) ◽  
pp. 755-766 ◽  
Author(s):  
M. Šolić ◽  
N. Krstulović ◽  
N. Bojanić ◽  
I. Marasović ◽  
Ž. Ninčević
Keyword(s):  
Seasonal Dynamics ◽  
Bacterial Abundance ◽  
Adriatic Sea ◽  
Species Assemblages ◽  
Zooplankton Grazing ◽  
Relative Importance ◽  
Top Down ◽  
Bottom Up ◽  
Inverse Process ◽  
Heterotrophic Nanoflagellate

Seasonal dynamics of bacterial and heterotrophic nanoflagellate (HNF) species assemblages were analysed in Kaštela Bay (middle Adriatic Sea). Dominant patterns identified were: (1) during summer and autumn bacterial abundance was mainly controlled by HNF grazing (top-down), whereas HNF abundance was controlled by bacterial abundance (bottom-up); (2) during winter and spring the coupling between bacteria and HNF was very weak, and bacterial abundance was mainly controlled by resources supply (bottom-up), whereas HNF abundance was controlled by micro-zooplankton grazing (top-down); (3) throughout the year, both bacterial and HNF species assemblages alternated with two periods of stable abundance, first with high and second with low values; (4) top-down effect was dominant in bacterial switching from stable abundance with high values to stable abundance with low values, whereas bottom-up model dominated in inverse process; and vice versa for HNF.

scholarly journals Different Roles of Top-Down and Bottom-Up Processes in the Distribution of Size-Fractionated Phytoplankton in Gwangyang Bay

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1682
Author(s):  
Yoonja Kang ◽  
Yeongji Oh
Keyword(s):  
Nutrient Availability ◽  
Fast Response ◽  
Nutrient Addition ◽  
The Other ◽  
Zooplankton Grazing ◽  
Top Down ◽  
Bottom Up ◽  
Phytoplankton Distribution ◽  
Summer Bloom ◽  
Gwangyang Bay

The interactive roles of zooplankton grazing (top-down) and nutrient (bottom-up) processes on phytoplankton distribution in a temperate estuary were investigated via dilution and nutrient addition experiments. The responses of size-fractionated phytoplankton and major phytoplankton groups, as determined by flow cytometry, were examined in association with zooplankton grazing and nutrient availability. The summer bloom was attributed to nanoplankton, and microplankton was largely responsible for the winter bloom, whereas the picoplankton biomass was relatively consistent throughout the sampling periods, except for the fall. The nutrient addition experiments illustrated that nanoplankton responded more quickly to phosphate than the other groups in the summer, whereas microplankton had a faster response to most nutrients in the winter. The dilution experiments ascribed that the grazing mortality rates of eukaryotes were low compared to those of the other groups, whereas autotrophic cyanobacteria were more palatable to zooplankton than cryptophytes and eukaryotes. Our experimental results indicate that efficient escape from zooplankton grazing and fast response to nutrient availability synergistically caused the microplankton to bloom in the winter, whereas the bottom-up process (i.e., the phosphate effect) largely governed the nanoplankton bloom in the summer.

scholarly journals Planktonic heterotrophic nanoflagellate abundance along a trophic gradient in subtropical reservoirs: influence of a bottom-up or top-down control mechanism

2014 ◽  
Vol 36 (2) ◽  
pp. 155 ◽  
Author(s):  
Danielle Goeldner Pereira ◽  
Luzia Cleide Rodrigues ◽  
Fábio Amodêo Lansac-Tôha ◽  
Luiz Felipe Machado Velho
Keyword(s):  
Control Mechanism ◽  
Trophic Gradient ◽  
Top Down ◽  
Bottom Up ◽  
Heterotrophic Nanoflagellate

Top-down and bottom-up induced shifts in bacterial abundance, production and community composition in an experimentally divided humic lake

2008 ◽  
Vol 10 (3) ◽  
pp. 635-652 ◽  
Author(s):  
Hans-Peter Grossart ◽  
Jan Jezbera ◽  
Karel Horňák ◽  
Kristine Michelle L. Hutalle ◽  
Ulrike Buck ◽  
...  
Keyword(s):  
Community Composition ◽  
Bacterial Abundance ◽  
Humic Lake ◽  
Top Down ◽  
Bottom Up

scholarly journals Variability in the bottom-up and top-down controls of bacteria on trophic and temporal scales in the middle Adriatic Sea

2009 ◽  
Vol 58 ◽  
pp. 15-29 ◽  
Author(s):  
M Solic ◽  
N Krstulovic ◽  
I Vilibic ◽  
N Bojanic ◽  
G Kuspipilic ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Top Down ◽  
Temporal Scales ◽  
Bottom Up

scholarly journals Ecosystem engineering strengthens bottom-up and weakens top-down effects via trait-mediated indirect interactions

2017 ◽  
Vol 284 (1863) ◽  
pp. 20170894 ◽  
Author(s):  
Zhiwei Zhong ◽  
Xiaofei Li ◽  
Dean Pearson ◽  
Deli Wang ◽  
Dirk Sanders ◽  
...  
Keyword(s):  
Trophic Interactions ◽  
Large Scale ◽  
Field Experiments ◽  
Ecosystem Engineering ◽  
Relative Importance ◽  
Top Down ◽  
Bottom Up ◽  
Spatial And Temporal Scales ◽  
Natural Systems ◽  
Ecological Scale

Trophic interactions and ecosystem engineering are ubiquitous and powerful forces structuring ecosystems, yet how these processes interact to shape natural systems is poorly understood. Moreover, trophic effects can be driven by both density- and trait-mediated interactions. Microcosm studies demonstrate that trait-mediated interactions may be as strong as density-mediated interactions, but the relative importance of these pathways at natural spatial and temporal scales is underexplored. Here, we integrate large-scale field experiments and microcosms to examine the effects of ecosystem engineering on trophic interactions while also exploring how ecological scale influences density- and trait-mediated interaction pathways. We demonstrate that (i) ecosystem engineering can shift the balance between top-down and bottom-up interactions, (ii) such effects can be driven by cryptic trait-mediated interactions, and (iii) the relative importance of density- versus trait-mediated interaction pathways can be scale dependent. Our findings reveal the complex interplay between ecosystem engineering, trophic interactions, and ecological scale in structuring natural systems.

scholarly journals Relative importance of top‐down vs. bottom‐up control of lake phytoplankton vertical distributions varies among fluorescence‐based spectral groups

2020 ◽  
Vol 65 (10) ◽  
pp. 2485-2501
Author(s):  
Mary E. Lofton ◽  
Taylor H. Leach ◽  
Beatrix E. Beisner ◽  
Cayelan C. Carey
Keyword(s):  
Relative Importance ◽  
Top Down ◽  
Bottom Up ◽  
Vertical Distributions
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