BR. J. ENT. NAT. HIST., 7: 1994 



Table 3. Chi-squared analysis comparing the number of moths of each species in yew wood- 

 land and chalk grassland. Criterion for inclusion: more than 10 moths taken. Two series 

 of tests using different expected ratios are given. In the first (A) the expected likelihoods 

 of a moth being caught in either habitat are equal. In the second (B) the probability of 

 being caught in a particular habitat is weighted by the number of all moths caught in that 

 habitat as a proportion of all moths in both habitats i.e. 0.648 for yew woodland, and 0.352 

 for chalk grassland. The direction of significant biases are given, with probability confidence limits 

 (ns means non-significant, i.e. the bias could be due to chance sampling error. Degrees of freedom = 1 

 throughout). 



Species 



Chi-squared (x 2 ) analysis 



A 



x 2 ; p; bias 



B 



X 2 ; p; bias 



Hemithea aestivaria 

 Cyclophora linearia 

 Idaea biselata 

 Idaea aversata 

 Cosmorhoe ocellata 

 Chloroclysta truncata 

 Thera obeliscata 

 Colostygia pectinataria 

 Hydriomena furcata 

 Horisme tersata 

 Melanthia procellata 

 Philereme vetulata 

 Semiothisa liturata 

 Opisthograptis luteolata 

 Ourapteryx sambucaria 

 Peribatodes rhomboidaria 

 Deileptenia ribeata 

 Alcis repandata 

 Ectropis bistortata 

 Ectropis crepuscularia 

 Cabera pusaria 

 Cabera exanthemata 

 Campaea margaritata 

 Hylaea fasciaria 

 Agrotis clavis 

 Agrotis exclamationis 

 Axylia putris 

 Ochropleura plecta 

 Noctua pronuba 

 Anaplectoides prasina 

 Hada nana 

 Mythimna pollens 

 Rusina ferruginea 

 Apamea monoglypha 

 Apamea sublustris 

 Oligia spp. 

 Caradrina morpheas 

 Lithacodia pygarga 

 Diachrysia chrysitis 

 Autographa pulchrina 

 Abrostola triplasia 

 Laspeyria flexula 

 Rivula sericealis 

 Hypena proboscidalis 

 Pechipogo strigilata 

 Herminia nemoralis 



ns 

 ns 



10.71; <0.005; yew 



36.03; < 0.001; yew 



6.23; <0.05; yew 



4.12; <0.05; grass 



ns 

 4.67; <0.05; yew 



ns 



ns 



3.85; <0.05; yew 



7.35; <0.01; yew 



9.31; <0.005; yew 



88.09; < 0.001; yew 



11.00; < 0.001; yew 



261.02; < 0.001; yew 



8.33; <0.005; yew 



ns 



5.76; <0.05; yew 



4.45; <0.05; yew 



33.99; < 0.001; yew 



4.57; <0.05; yew 



ns 

 4.61; <0.05; grass 



ns 

 4.57; <0.05; yew 



ns 



ns 



ns 

 9.78; < 0.005; grass 

 7.14; <0.01; grass 



ns 



ns 



ns 



ns 

 7.12; <0.01; grass 



ns 



ns 

 8.33; <0.005; yew 



ns 



ns 

 11.65; < 0.001; yew 

 11.00; < 0.001; yew 

 8.07; < 0.005; yew 



IIS 



11.89; < 0.001; grass 



4.04; <0.05; yew 



7.13; <0.01; yew 



ns 



ns 



ns 



17.0; < 0.001; grass 



6.64; <0.01; grass 



ns 





ns 







ns 





4.18 



<0.05; 



yew 



20.9; 



< 0.001 



yew 



5.40* 



; <0.05 



yew 



81.80 



< 0.001 

 ns 

 ns 

 ns 

 ns 



; yew 



10.11 



< 0.005 

 ns 



; yew 



6.51; 



<0.01; 



grass 



39.56; 



<0.001 

 ns 

 ns 

 ns 

 ns 

 ns 



grass 



22.64; 



< 0.001 



grass 



15.67; 



< 0.001 

 ns 



grass 



10.49; 



< 0.005 



grass 



3.94; 



<0.05; 



grass 



5.19; 



<0.05; 



grass 



16.60; 



< 0.001 



grass 



5.41*; 



<0.05; 



grass 



15.67; 



<0.001 

 ns 

 ns 



grass 



7.80; 



<0.01; 



ns 



grass 



5.40* 



; <0.05, 

 ns 



yew 



*Yates' correction used for low expected values. 



