scholarly journals Major contribution of both zooplankton and protists to the top-down regulation of freshwater aerobic anoxygenic phototrophic bacteria

2015 ◽  
Vol 76 (1) ◽  
pp. 71-83 ◽  
Author(s):  
MC Garcia-Chaves ◽  
MT Cottrell ◽  
DL Kirchman ◽  
AM Derry ◽  
MJ Bogard ◽  
...  
Keyword(s):  
Phototrophic Bacteria ◽  
Anoxygenic Phototrophic Bacteria ◽  
Top Down ◽  
Down Regulation ◽  
Aerobic Anoxygenic Phototrophic Bacteria

scholarly journals DISTRIBUTION AND ABUNDANCE OF AEROBIC ANOXYGENIC PHOTOTROPHIC BACTERIA IN THE TROPICAL COASTAL WATERS OF GUNUNGKIDUL, YOGYAKARTA

2015 ◽  
Vol 2 (1) ◽  
pp. 244
Author(s):  
Victor Aprilyanto ◽  
Tjut Sugandawaty Djohan ◽  
Langkah Sembiring
Keyword(s):  
Coastal Waters ◽  
Catchment Area ◽  
Sampling Site ◽  
Ammonium Phosphate ◽  
Anoxygenic Phototrophic Bacteria ◽  
Top Down ◽  
Dissolved Nutrients ◽  
Sampling Depth ◽  
Coastal Fish ◽  
Aerobic Anoxygenic Phototrophic Bacteria

<p>This research was conducted to reveal the distribution and abundance of aerobic anoxygenic phototrophic (AAP) in the tropical coastal waters of Gunungkidul, Yogyakarta. Sampling site was determined at the coastal fish catchment area. We sampled and enumerated total bacterioplankton and AAP bacteria at four sampling depth which are 0, 4, 6, and 20 metre with five replicates each. Several dissolved nutrients such as nitrate, ammonium, phosphate, and sulfate in each respective depths were also measured. Several fluctuations in the nutrient distributions were observed and hypothesized as the regulating factors to the distribution and abundance of AAP bacteria as well as bacterioplankton. The results revealed that AAP bacteria were ranging from 3.83×102 –7.48×102 cell/ml, comprising about 1% to ~2.5% of total bacterioplankton. The abundance of both community were quite low and showed similar distributions with the nutrients. In conclusion, the distribution and abundance of AAP bacteria were regulated by nutrients as the bottom-up factors and also by predators such as nanoplanktons as the top-down factors.</p><p><br /><strong>Keywords</strong>: tropical waters, microbial loop, predation.</p>

scholarly journals Abundance and Spatial Distribution of Aerobic Anoxygenic Phototrophic Bacteria in Tama River, Japan

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 150
Author(s):  
Yuki Sato-Takabe ◽  
Setsuko Hirose ◽  
Tomoyuki Hori ◽  
Satoshi Hanada
Keyword(s):  
Spatial Distribution ◽  
Phototrophic Bacteria ◽  
Anoxygenic Phototrophic Bacteria ◽  
Epifluorescence Microscopy ◽  
Free Living ◽  
Aerobic Anoxygenic Phototrophic Bacteria ◽  
Riverine Environment ◽  
Global Oceans ◽  
Total Bacteria ◽  
Aggregation Form

Aerobic anoxygenic phototrophic bacteria (AAnPB) are widely distributed and regarded as key players driving the carbon cycle in surface water of global oceans, coastal and estuary areas and in other freshwater environments (e.g., ponds and lakes). However, the abundance and spatial distribution of AAnPB in rivers is much less well-known. Here we investigated the variation of the absolute cell abundances of the total bacteria, AAnPB and cyanobacteria, at four different sites in Tama River, Japan, and the spatial distribution (i.e., free-living or particle-attached existence form) of AAnPB at two out of the four sites using infra-red epifluorescence microscopy. Free-living cell abundances for the total bacteria, AAnPB and cyanobacteria were 1.6–3 × 105, 1.5–4.4 × 104 and <3.2 × 104 cells mL−1, respectively. The free-living AAnPB accounted for 6.1%–19.6% of the total bacterial abundance in the river. The peaks of the AAnPB and cyanobacteria abundances were found at the same site, suggesting that the AAnPB could potentially coexist with cyanobacteria. Meanwhile, the particle-attached AAnPB were observed at the two sites of the river, accounting for 52.2% of the total bacteria abundance in the particle. Our results showed the existence and aggregation form of AAnPB in the riverine environment.

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