The combined effects of water level reduction and an increase in ammonia concentration on organic matter processing by key freshwater shredders in alluvial wetlands

2012 ◽  
Vol 19 (3) ◽  
pp. 763-774 ◽  
Author(s):  
Arnaud Dehedin ◽  
Chafik Maazouzi ◽  
Sara Puijalon ◽  
Pierre Marmonier ◽  
Christophe Piscart
Keyword(s):  
Organic Matter ◽  
Water Level ◽  
Ammonia Concentration ◽  
Combined Effects ◽  
Water Level Reduction ◽  
Organic Matter Processing ◽  
Level Reduction

Drought-induced water-level reduction favors cyanobacteria blooms in tropical shallow lakes

Hydrobiologia ◽  
2015 ◽  
Vol 770 (1) ◽  
pp. 145-164 ◽  
Author(s):  
Jandeson Brasil ◽  
José L. Attayde ◽  
Francisco R. Vasconcelos ◽  
Danyhelton D. F. Dantas ◽  
Vera L. M. Huszar
Keyword(s):  
Water Level ◽  
Shallow Lakes ◽  
Cyanobacteria Blooms ◽  
Water Level Reduction ◽  
Level Reduction

scholarly journals Body size affects the vertical movement of benthic amphipods through subsurface sediments in response to drying

Hydrobiologia ◽  
2021 ◽  
Vol 848 (5) ◽  
pp. 1015-1025
Author(s):  
C. Patel ◽  
A. N. Vadher ◽  
K. L. Mathers ◽  
C. Dwyer ◽  
P. J. Wood
Keyword(s):  
Body Size ◽  
Water Level ◽  
Vertical Movement ◽  
Sediment Particle ◽  
Sediment Particle Size ◽  
Subsurface Sediments ◽  
Water Level Reduction ◽  
Surface Drying ◽  
Response To Water ◽  
Level Reduction

AbstractThis study aimed to experimentally examine how riverbed drying and different rates of water level reduction influenced the vertical movement of amphipods of various sizes into different subsurface sediment compositions. Using sediment columns (mesocosms) filled with different sized transparent substrates, we explored how varying speeds of drawdown affected vertical movement and stranding of individuals. We hypothesised that: (1) larger individuals would be less able to migrate within subsurface sediments compared to smaller ones; (2) smaller sediment particles would lead to more individuals becoming stranded and; (3) faster rates of water level drawdown would increase the likelihood of individuals becoming stranded above the waterline. Body size significantly influenced the final position of an individual, with smaller individuals accessing deeper sediments more readily. Larger amphipods were more likely to become stranded above the waterline. Amphipods migrated to greater depths during faster water level reduction rates with smaller individuals displaying greater overall movement. Sediment particle size did not influence the ability of amphipods to move vertically into subsurface sediments in response to water level reduction. The results indicate that subsurface sediments may serve as a refuge from surface drying but that both the size of individual invertebrates influences their ability to migrate vertically.

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