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The responses of a lotic mayfly Nousia sp. (Ephemeroptera: Leptophlebiidae) to moving water and light of different wavelengths
Author(s) -
Barmuta Leon A.,
Mckenny Claire E. A.,
Swain Roy
Publication year - 2001
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1046/j.1365-2427.2001.00692.x
Subject(s) - mayfly , benthic zone , baetidae , invertebrate , diel vertical migration , hydrobiology , river ecosystem , aquatic insect , ecology , nymph , biology , environmental science , hydrology (agriculture) , habitat , aquatic environment , geology , geotechnical engineering
1. Although laboratory studies of the behaviour of aquatic macroinvertebrates are common, there has been little critical evaluation of the importance of test conditions to them. We used a common Australian leptophlebiid mayfly, Nousia sp., to investigate responses to light, wavelength of light, presence or absence of cover and still or flowing water. 2. Nousia sp. showed substantial qualitative differences in behaviour, as measured by movement, when there was no refuge (in the form of a crevice beneath a tile) present in the experimental arena. 3. We found no evidence of diel periodicity in activity in Nousia sp. 4. Nousia sp. did not respond to infra‐red, red or green light at a flux density of 18–19 μmol m –2 s –1 . 5. Nymphs were three times more likely to remain stationary in flowing water (mean velocity 0.10 m s –1 ) than in still water. 6. We conclude that generalized assumptions about test conditions for experiments designed to quantify laboratory behaviour in benthic macroinvertebrates are unjustified and that evaluation of the individual requirements of test species should be conducted routinely.