Open AccessLife histories and distribution of British Trichoptera, excluding Limnephilidae and Hydroptilidae, based on the Rothamsted Insect Survey
Author(s) -
Crichton M. I.,
Fisher D.,
Woiwod I. P.
Publication year - 1978
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/j.1600-0587.1978.tb00936.x
Subject(s) - voltinism , biological dispersal , biology , ecology , diapause , distribution (mathematics) , geography , zoology , larva , demography , population , mathematical analysis , mathematics , sociology
Catches of Trichoptera from 67 light traps in Great Britain are studied. Two families are excluded: the Limnephilidae because they have been considered in an earlier publication, and the Hydroptilidae. Catches from 148 complete year records, from 1965 to 1971, are grouped in three areas: A. Scotland, 15 sites; B. Wales and Northern England. 18 sites; C. Southern England, 34 sites. The total of over 146000 caddis flies includes 60 of the 109 British species from 14 families. Small or nil catches are explained by limited distribution or dispersal, short adult lives and day‐flying habits. The flight periods are related to published information on life cycles. Most species are univoltine, but some small species are bivoltine. In contrast to Limnephilidae, there is no evidence of a summer adult diapause, median weeks for flight periods tend to be earlier in the south, and few species are autumnal fliers. Density distribution maps, produced by computer, are given for six species.