a riffle beetle

Beetle Survey Results

Aquatic Coleoptra at River Wye SSSI, Symonds Yat Rapids, Herefordshire (September 2000)

Presentation of Results

Table 1 - List and brief description of the surveyed sites

Site

OS Map Reference

Site Description

Site 1 SO 560156 Central channel to upstream end of island. Mossy cobbles. 300mm depth.
Site 2 SO 561156 Upstream end of island. Cobbles with peripheral Phragmites. 200-300mm depth.
Site 3 SO 560156 West side of island. Cobbles with peripheral Phragmites. 300mm depth.
Site 4 SO 559156 West bank of river opposite island. Exposed Alder roots and silty margins. 300mm depth.
Site 5 SO 559155 Downstream edge of island. Exposed Alder roots and gravel beds. 200mm depth.
Site 6 SO 557152 600m downstream from island on East bank. Exposed Alder roots and silty margins. 100-300mm depth.
Site 7 SO 557152 600m downstream from island. Central channel with Ranunculus on fixed cobles. 600mm depth.
Site 8 SO 558154 300m downstream from island on East bank. Exposed Alder roots and silty margins. 300mm depth.
Site 9 SO 558154 300m downstream from island central channel with Ranunculus beds on gravel and sand. 600mm depth.
Site 10 SO 561155 East side of rapids opposite island. Mossy cobbles. 400mm depth.
Site 11 SO 557153 500m downstream of island on West bank. Silty margins with Phragmites 300-600mm depth.
Site 12 SO 561156 East side of the island. Cobbles, some fine gravel and exposed Alder roots. 200-300mm depth.

Map 1 - Approximate positions of surveyed sites

Map 1 - Approximate positions of surveyed sites

 

Table 3 - Occurrence of species at each surveyed site

Species

1 2 3 4 5 6 7 8 9 10 11 12
Haliplus fluviatilis S       S S   S   S F  
Laccophilus hyalinus                     F  
Nebroporus elegans   F F F   F O F S O F O
Stictotarsus 12-pustulatus       S       S   S S  
Orectochilus villosus S         S   S   S    
Helophorus flavipes           S            
Hydraena riparia       S       S        
Pomatinus substriatus       S                
Elmis aenea     S S           S    
Limnius vockmari F     F F F O   S F S F
Macronychus 4 - tuberculatus   S   S S S     S      
Normandia nitens       S S S     S      
Oulimnius troglodytes O     F F F O F S O O O
O. tuberculatus O F F F F F O F S O O O

Abbreviations:
S = Scarce (1-3 specimens)
O = Occasional (3-6 specimens)
F = Frequent (more than 6 specimens)

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