Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism
1. The predominantly nocturnal constrained drift of stream invertebrates is commonly regarded as a behaviour that avoids encounters with visually foraging fish in the water column. The alternative explanation, that drift peaks are caused by bottom‐feeding, nocturnal predators, has rarely been tested...
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crwiley:10.1046/j.1365-2427.2000.00615.x 2024-06-02T08:12:02+00:00 Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism Huhta, Arto Muotka, Timo Tikkanen, Pertti 2000 http://dx.doi.org/10.1046/j.1365-2427.2000.00615.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2427.2000.00615.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2427.2000.00615.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Freshwater Biology volume 45, issue 1, page 33-42 ISSN 0046-5070 1365-2427 journal-article 2000 crwiley https://doi.org/10.1046/j.1365-2427.2000.00615.x 2024-05-03T11:57:52Z 1. The predominantly nocturnal constrained drift of stream invertebrates is commonly regarded as a behaviour that avoids encounters with visually foraging fish in the water column. The alternative explanation, that drift peaks are caused by bottom‐feeding, nocturnal predators, has rarely been tested. 2. We examined these hypotheses by collecting invertebrate drift in five streams in northern Finland: one with brown trout ( Salmo trutta , a drift‐feeding fish), one with alpine bullhead ( Cottus poecilopus , a benthic fish), one with both species, and two fishless streams. 3. Drift by Baetis mayflies was aperiodic or slightly diurnal in both fishless streams on all sampling occasions. In contrast, drift was nocturnal in streams with trout and, to a lesser extent, in the stream with bullhead. Non‐dipteran prey drifted mainly nocturnally in all streams with fish, whereas Diptera larvae were less responsive to the presence of fish. 4. In laboratory experiments, bullheads were night‐active, causing a much higher frequency of drift by touching Baetis at night than during the day. Thus, increased nocturnal drift may serve to avoid both visual predators (a pre‐contact response) and benthic fish (a post‐contact response). In streams with bottom‐feeding fish, nocturnal drift should be caused by increased drift by night rather than by reduced drift by day. Article in Journal/Newspaper Northern Finland Wiley Online Library Freshwater Biology 45 1 33 42 |
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English |
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1. The predominantly nocturnal constrained drift of stream invertebrates is commonly regarded as a behaviour that avoids encounters with visually foraging fish in the water column. The alternative explanation, that drift peaks are caused by bottom‐feeding, nocturnal predators, has rarely been tested. 2. We examined these hypotheses by collecting invertebrate drift in five streams in northern Finland: one with brown trout ( Salmo trutta , a drift‐feeding fish), one with alpine bullhead ( Cottus poecilopus , a benthic fish), one with both species, and two fishless streams. 3. Drift by Baetis mayflies was aperiodic or slightly diurnal in both fishless streams on all sampling occasions. In contrast, drift was nocturnal in streams with trout and, to a lesser extent, in the stream with bullhead. Non‐dipteran prey drifted mainly nocturnally in all streams with fish, whereas Diptera larvae were less responsive to the presence of fish. 4. In laboratory experiments, bullheads were night‐active, causing a much higher frequency of drift by touching Baetis at night than during the day. Thus, increased nocturnal drift may serve to avoid both visual predators (a pre‐contact response) and benthic fish (a post‐contact response). In streams with bottom‐feeding fish, nocturnal drift should be caused by increased drift by night rather than by reduced drift by day. |
format |
Article in Journal/Newspaper |
author |
Huhta, Arto Muotka, Timo Tikkanen, Pertti |
spellingShingle |
Huhta, Arto Muotka, Timo Tikkanen, Pertti Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
author_facet |
Huhta, Arto Muotka, Timo Tikkanen, Pertti |
author_sort |
Huhta, Arto |
title |
Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
title_short |
Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
title_full |
Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
title_fullStr |
Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
title_full_unstemmed |
Nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
title_sort |
nocturnal drift of mayfly nymphs as a post‐contact antipredator mechanism |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1046/j.1365-2427.2000.00615.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2427.2000.00615.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2427.2000.00615.x |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_source |
Freshwater Biology volume 45, issue 1, page 33-42 ISSN 0046-5070 1365-2427 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-2427.2000.00615.x |
container_title |
Freshwater Biology |
container_volume |
45 |
container_issue |
1 |
container_start_page |
33 |
op_container_end_page |
42 |
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1800758345235169280 |