Protozoan communities in chalk streams

Hydrobiologia ◽  
1992 ◽  
Vol 248 (1) ◽  
pp. 53-64 ◽  
Author(s):  
M. A. Sleigh ◽  
B. M. Baldock ◽  
J. H. Baker
Keyword(s):  

1993 ◽  
Vol 8 (1-2) ◽  
pp. 121-134 ◽  
Author(s):  
Melanie Bickerton ◽  
Geoffrey Petts ◽  
Patrick Armitage ◽  
Emmanuel Castella




1997 ◽  
Vol 51 (1) ◽  
pp. 64-79 ◽  
Author(s):  
J. Prenda ◽  
P. D. Armitage ◽  
A. Grayston


2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Melanie J. Dixon ◽  
Peter J. Shaw

Watercress releases phenethyl isothiocyanate (PEITC) upon wounding as a defence against herbivores. PEITC levels released from watercress farms are elevated due to cropping, washing, and processing and are thought to lead to adverse effects onGammarus pulexin chalk streams. This study elucidates the sublethal effect of PEITC on reproductive behaviour ofG. pulex, employingex situtests to investigate the disruption of precopular pairing under conditions simulatingin situexposure. Mean time to separation of precopular pairs was 89 ± 6 minutes for watercress wash water (1 g watercress per litre water) and 81 ± 15 minutes for pure PEITC (1 μL/L). Re-exposure to watercress wash water to simulate the pulsed operation at a watercress farm did not alter behavioural response. The repeated interruption of reproductive behaviour underin situconditions would impair long-term reproductive success and could explain in part low abundance ofG. pulexdownstream of watercress farms.



Hydrobiologia ◽  
1991 ◽  
Vol 210 (3) ◽  
pp. 183-189 ◽  
Author(s):  
A. P. Mackey ◽  
A. D. Berrie


Hydrobiologia ◽  
2003 ◽  
Vol 494 (1-3) ◽  
pp. 111-117 ◽  
Author(s):  
M. J. T. Heywood ◽  
D. E. Walling


Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2212
Author(s):  
Imogen Barnsley ◽  
Rebecca Spake ◽  
Justin Sheffield ◽  
Julian Leyland ◽  
Tim Sykes ◽  
...  

This study aims to address the gap in the Natural Flood Management (NFM) evidence base concerning its implementation potential in groundwater-dominated catchments. We generated a typology of 198 chalk catchments using redundancy analysis and hierarchical clustering. Three catchment typologies were identified: (1) large catchments, (2) headwater catchments with permeable soils, and (3) catchments with impermeable soils and surfaces (urban and suburban land uses). The literature suggests that natural flood management application is most effective for catchments <20 km2, reducing the likelihood of significant flood mitigation in large catchments. The relatively lower proportion of surface runoff and higher recharge in permeable catchments diminishes natural flood management’s likely efficacy. Impermeable catchments are most suited to natural flood management due to a wide variety of flow pathways, making the full suite of natural flood management interventions applicable. Detailed groundwater flood maps and hydrological models are required to identify catchments where NFM can be used in a targeted manner to de-synchronise sub-catchment flood waves or to intercept runoff generated via groundwater emergence. Whilst our analysis suggests that most chalk groundwater-dominated catchments in this sample are unlikely to benefit from significant flood reductions due to natural flood management, the positive impact on ecosystem services and biodiversity makes it an attractive proposition.





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