Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae)
Larval parasitism of Epirrita autumnata (Borkhausen) was monitored during six years in field samples from within the outbreak range of E. autumnata in northern Fennoscandia, and outside it in southern Finland. All parasitoids found were hymenopterans. Six phenologically early species of parasitoids...
Published in: | Entomologica Fennica |
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This journal is published jointly by the Entomological Society of Finland, the Lepidopterological Society of Finland, the Societas Entomologica Helsingforsiensis and the Entomological Club of the Zoological and Botanical Society of Turku.
1994
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Online Access: | https://journal.fi/entomolfennica/article/view/83787 https://doi.org/10.33338/ef.83787 |
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fttsvojs:oai:journal.fi:article/83787 2023-05-15T16:11:52+02:00 Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) Ruohomäki, Kai 1994-01-01 application/pdf https://journal.fi/entomolfennica/article/view/83787 https://doi.org/10.33338/ef.83787 eng eng This journal is published jointly by the Entomological Society of Finland, the Lepidopterological Society of Finland, the Societas Entomologica Helsingforsiensis and the Entomological Club of the Zoological and Botanical Society of Turku. https://journal.fi/entomolfennica/article/view/83787/55394 https://journal.fi/entomolfennica/article/view/83787 doi:10.33338/ef.83787 Copyright (c) 2019 Entomologica Fennica Entomologica Fennica; Vol 5 No 1 (1994); 27-34 Entomologica Fennica; Vol 5 Nro 1 (1994); 27-34 2489-4966 0785-8760 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed article 1994 fttsvojs https://doi.org/10.33338/ef.83787 2020-07-22T22:44:47Z Larval parasitism of Epirrita autumnata (Borkhausen) was monitored during six years in field samples from within the outbreak range of E. autumnata in northern Fennoscandia, and outside it in southern Finland. All parasitoids found were hymenopterans. Six phenologically early species of parasitoids were found in populations within the outbreak range and three species outside the outbreak range. Two late larval parasitoid species were found within the outbreak range, but none outside the outbreak range. In half of the populations within the outbreak range, early larval parasitoids seemed to increase with a time lag. This is consistent with the cyclic population fluctuations of E. autumnata there. On a small spatial scale (among trees), however, parasitoids acted without a time lag. Parasitism rates by the early larval parasitoids are probably too low (mean 11%) for early parasitoids alone to keep densities of E. autumnata continuously at low levels outside the outbreak range in southern Finland. Article in Journal/Newspaper Fennoscandia Federation of Finnish Learned Societies: Scientific Journals Online Entomologica Fennica 5 1 27 34 |
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Open Polar |
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Federation of Finnish Learned Societies: Scientific Journals Online |
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fttsvojs |
language |
English |
description |
Larval parasitism of Epirrita autumnata (Borkhausen) was monitored during six years in field samples from within the outbreak range of E. autumnata in northern Fennoscandia, and outside it in southern Finland. All parasitoids found were hymenopterans. Six phenologically early species of parasitoids were found in populations within the outbreak range and three species outside the outbreak range. Two late larval parasitoid species were found within the outbreak range, but none outside the outbreak range. In half of the populations within the outbreak range, early larval parasitoids seemed to increase with a time lag. This is consistent with the cyclic population fluctuations of E. autumnata there. On a small spatial scale (among trees), however, parasitoids acted without a time lag. Parasitism rates by the early larval parasitoids are probably too low (mean 11%) for early parasitoids alone to keep densities of E. autumnata continuously at low levels outside the outbreak range in southern Finland. |
format |
Article in Journal/Newspaper |
author |
Ruohomäki, Kai |
spellingShingle |
Ruohomäki, Kai Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) |
author_facet |
Ruohomäki, Kai |
author_sort |
Ruohomäki, Kai |
title |
Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) |
title_short |
Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) |
title_full |
Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) |
title_fullStr |
Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) |
title_full_unstemmed |
Larval parasitism in outbreaking and non-outbreaking populations of Epirrita autumnata (Lepidoptera, Geometridae) |
title_sort |
larval parasitism in outbreaking and non-outbreaking populations of epirrita autumnata (lepidoptera, geometridae) |
publisher |
This journal is published jointly by the Entomological Society of Finland, the Lepidopterological Society of Finland, the Societas Entomologica Helsingforsiensis and the Entomological Club of the Zoological and Botanical Society of Turku. |
publishDate |
1994 |
url |
https://journal.fi/entomolfennica/article/view/83787 https://doi.org/10.33338/ef.83787 |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_source |
Entomologica Fennica; Vol 5 No 1 (1994); 27-34 Entomologica Fennica; Vol 5 Nro 1 (1994); 27-34 2489-4966 0785-8760 |
op_relation |
https://journal.fi/entomolfennica/article/view/83787/55394 https://journal.fi/entomolfennica/article/view/83787 doi:10.33338/ef.83787 |
op_rights |
Copyright (c) 2019 Entomologica Fennica |
op_doi |
https://doi.org/10.33338/ef.83787 |
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Entomologica Fennica |
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5 |
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1 |
container_start_page |
27 |
op_container_end_page |
34 |
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1765997060191944704 |