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| 2. |
- Franzén, Markus, et al.
(författare)
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Habitat associations and occupancy patterns of burnet moths (Zygaenidae) in semi-natural pastures in Sweden
- 2004
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Ingår i: Entomologica Fennica. - 0785-8760. ; 15:2, s. 91-101
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Tidskriftsartikel (refereegranskat)abstract
- Burnets were surveyed in 100 semi-natural pastures in the province of Ostergotland, southeastern Sweden. We analysed the presence/absence of burnets in relation to habitat characteristics, and species richness of butterflies and plants. Five species were found (Adscita statices, Zygaena osterodensis, Z. viciae, Z. filipendulae and Z. lonicerae), all occurring in 33%-36% of the localities. Among these, four are nationally red-listed. More species were found on (1) large semi-natural pastures, compared with small, (2) low- to medium-grazed semi-natural pastures, compared with heavily grazed, and (3) open semi-natural pastures, compared with wooded. A. statices and Z. viciae had a higher frequency of occupancy at localities surrounded by a large density of pastures, but the occurence of the other species did not rely on this variable. The number of burnet species per locality was positively correlated with the number of butterfly species, and slightly positively correlated with species richness of plants. The difference in species richness among burnets, butterflies and plants may be explained by different responses to grazing pressure; the species richness of burnets and butterflies peaked in localities with a low grazing pressure, while species richness of plants was unaffected by grazing. As burnets are easily surveyed and indicate a high butterfly-species richness, they may be suitable indicators of species richness of pastures. As uniform management with heavy grazing is detrimental for burnets and for many butterflies, it should be avoided at localities with a species-rich fauna.
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| 3. |
- Nittérus, Karolina, 1972, et al.
(författare)
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Insects reared from logging residue on clear-cuts
- 2004
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Ingår i: Entomologica Fennica. - 0785-8760. ; 15:1, s. 53-61
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Tidskriftsartikel (refereegranskat)abstract
- Coniferous and deciduous logging residue ("slash") was collected from six 1-year old and six 4-year old clear-cuts in South-West Sweden during the spring of 2002. In the laboratory, insects were emerged under standardised conditions. Insects emerged in 41% of the rearing-tubes with 1-year old slash. In 4-year old slash, 54% of the tubes contained insects. The most successfully emerged order was Coleoptera, represented by 10 families, 22 species and 425 individuals. The second most abundant order was Hymenoptera. The most abundant Coleoptera family was Curculionidae that comprised 48% of all the beetles. Four distinct species groups among Coleoptera. were found, each group being separated by slash age and tree category (deciduous/coniferous). Significantly more species were found in the 4-year old deciduous slash, compared to the 1-year old. In coniferous slash, there was a tendency for more species in the 1-year old slash than in the 4-year old. The results suggest that slash is valuable as breeding substrate and/or food supply to the beetle fauna on clear-cuts.
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| 5. |
- Thunes, KH, et al.
(författare)
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The arthropod community of Scots pine (Pinus sylvestris L.) canopies in Norway
- 2004
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Ingår i: Entomologica Fennica. - 0785-8760. ; 15:2, s. 65-90
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Forskningsöversikt (refereegranskat)abstract
- We summarise the findings of arthropods collected by fogging the canopy of 24 pine trees in two sites in Eastern and Western Norway. From the samples, taken in 1998 and in 1999, almost 30,000 specimens were determined to 512 species, with Diptera being most species rich (210 species), followed by Coleoptera (76 species) and Araneae (49 species). Of the 96 new species records, nine were new to science (5 Diptera and 4 Oribatida), two were new to the European, three to the Scandinavian and 82 to the Norwegian faunas. The paper demonstrates the need for detailed faunistical inventories of European forests.
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