compared to the other stations. For more detailed data see Table 8.2.1 

 and Fig. 8.2.1. 



The percentual distribution of the different groups of animals 

 (Table 8.2.2, Fig. 8.2.3) shows some similarity between station B and D 

 and between station C and G, respectively. At station B and D, Formicidae 

 (ants) and the species Porcellio scaber (woodlouse) dominated -- at B 

 together with Diptera (flies and gnats) and at D with Collembola (spring- 

 tails), while at station C and G, Araneae (spiders) were strikingly 

 dominant, followed by Diptera. The gammarid Orchestia gammarellus was 

 frequent only at station G where it comprised 10.5% (59 individuals) of 

 the total number of individuals found, while at station C the corres- 

 ponding figure was 0.2% (1 individual). No gammarid could be found at 

 the other stations. 



At station G there also seemed to be more parasitic hymenopteras 

 and cicadas (Homoptera) than at the other stations. The little wood- 

 louse Porcellio scaber appeared in small numbers at station C and G 

 compared to stations B and D. 



In one of the traps at station G a shrew (Sorex sp . ) was found in 

 company with some fleas. These latter were not included in the calcu- 

 lations . 



8.2.4.2 Quantitative samples 



The average number of individuals/lOOg wrack dry weight at stations 

 G and C was two to three times higher than at stations B and D (Table 8.2.6) 

 The total number of systematic groups found was 11 at station B and 13 

 at each of the other stations (Table 8.2.4, Fig. 8.2.2). 



The percentual distribution of the systematic groups (Table 8.2.5 

 and Fig. 8.2.4) in this case also showed a similarity between stations B 

 and D and stations C and G, respectively. Porcellio scaber was clearly 

 dominant at station B and D, followed by Acarina (ticks), while Araneae 

 seemed to be less frequent at these stations. Myriapoda (millepedes) 

 made up 10.2% of the total number of individuals found at station B 

 while at C and G this group could not be found either in the quanti- 

 tative samples or in the traps. At station C and G Acarina and 



161 



