STUDIES ON THE CEREAL ECOSYSTEM
121
however, contained 27% fewer taxa than the downland at site (2),
whilst the winter barley occupied an intermediate position. There were
also marked differences in faunal diversity (a) between the sites, the
maximum (27) and minimum (17) values being obtained at sites (2) and
(4). This represented a decline in diversity of 37% (Fig. 4).
FIU. 4. Species frequency abundance curves for arthropods at four sites ranging
from downland to spring barley, based on pitfall traps in 1969.
Although all individuals in the samples were not taken to the species
level, this was done with the adult Coleoptera. A very similar pattern
121
however, contained 27% fewer taxa than the downland at site (2),
whilst the winter barley occupied an intermediate position. There were
also marked differences in faunal diversity (a) between the sites, the
maximum (27) and minimum (17) values being obtained at sites (2) and
(4). This represented a decline in diversity of 37% (Fig. 4).
FIU. 4. Species frequency abundance curves for arthropods at four sites ranging
from downland to spring barley, based on pitfall traps in 1969.
Although all individuals in the samples were not taken to the species
level, this was done with the adult Coleoptera. A very similar pattern