NORSK ENTOMOLOGISK TIDSSKRIFT - Norsk entomologisk forening

H. pulchellus L.
H. riparius F.
H. rivularius Gyll.
Athous subfuscus Mull.
Byrrhidae
Simplocaria semistriata F.
Cytilus sericeus Forst.
Syncalypta paleata Er.
Cryptophagidae
Paramecosoma melanocephalum Hbst.
Atomaria fuscicollis Mnh.
A. puncticollis Th.
Adalia bipunctata L.
Calvia 14-guttata L.
Coccinellidae
Pythidae
Rhinosimus ruficollis L.
Scarabaeidae
Psammodius asper F.
Aegialia sabuleti Panz.
Chrysomelidae
Syneta betulae F.
Phytodecta pallidus L.
Phyllodecta vitellinae L.
Curculionidae
Apion loti Kby.
Otiorrhynchus dubius Strom
O. ovatus L.
Sitona flavescens Mrsh.
Tropiphorus obtusus Bonsd.
Notaris acridulus L.
Grypus equiseti F.
Phytobius velaris Gyll.
Rhynchaenus foliorum Mull.
Scolytidae
Hylastes cunicularius Er.
Dryocoetes alni Georg.
D. autographus Ratz.
THE EFFECT OF INUNDATION 123
4
3
1
1
3
1
2
1
6
2
2
1
2
2
1
1
1
1
10
1
2
11
been in the river for hours. Collected material
from the G aula 4 August 1961 (partly
published in Andersen 1962), gave the impression
of a fauna even richer than that in June
1965, quantitatively as well as qualitatively.
This material had been in the river for less
than one day.
IV. Sites with compact silt submerged by
the river
Sample IV-l (Table VII), the Gaula, Station
6, 12 June 1965: Sparse vegetation. The sites
had been submerged at least seven, perhaps
twelve, days and nights.
Sample IV-2 (Table VII), Rundhaug, 22
June 1967: Sparse vegetation. The sites had
been submerged a few hours. The silt was
crushed and washed within an area of about
2-4 m 2 •
Sample IV-3, Rundhaug, 22 June 1967:
Dense vegetation. The sites had been submerged
a few hours. No Coleoptera were
found by crushing the silt. Earlier in the day,
before the sites were flooded, they harboured
a rich fauna (Samples 1-5).
Observations and experiments
When jars, contaInIng adult Coleoptera
living in their natural substratum, were carefully
filled with water at 18-20° C, the fol-
Table VI.
Number ofColeoptera collected in Sample ///-2
Bembidion schueppeli Dej.
Notiophilus sp. (larva)
Arpedium brachypterum Gr.
Bledius arcticus J. Sahib.
Gyrophaena nana Payk.
Sipalia circellaris Gr.
Atheta magniceps J. Sahib.
A. melanocera Th.
A. microptera Th.
Hypnoidus pulchellus L.
Cytilus cericeus Forst.
Aegialia sabuleti Panz.
Hylastes brunneus Er.
1
1
1
1
1
3
1
2
1
5
1
3
1