Open AccessThe fauna of the exposed zone of Øvre Heimdalsvatn: Methods, sampling stations and general results
Author(s) -
Brittain John E.,
Lillehammer Albert
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.tb00954.x
Subject(s) - chironomidae , fauna , detritus , ecology , gammarus , invertebrate , biology , taxon , period (music) , larva , amphipoda , crustacean , physics , acoustics
Twenty stations were sampled monthly during the Ice free period (June‐September) in 1972. Emergence traps, emptied daily, were also employed. The major macroinvertebrates in the exposed zone were Ephemeroptera, Gammarus lacustris , Trichoptera, Chironomidae, Plecoptera and Coleoptera, and these constituted over 90% of total numbers. Densities of G. lacustris , Ephemeroptera, Tipulidae and Plecoptera showed a positive correlation with detritus. No significant relationship was found for the other taxa. Nearly 70% of the fauna emerged, and did so during the period from June to September. Chironomidae, Ephemeroptera, Plecoptera, Trichoptera and Tipulidae accounted for nearly all emergence and their total average annual emergence was 372 cal m −2 . Of this total, Chironomidae constituted 28%, Ephemeroptera 28%, Plecoptera and Trichoptera 15% each and Tipulidae 4%.