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Titolo:
Reconstructing the late-Holocene history of a subalpine environment (Charlevoix, Quebec) using fossil insects
Autore:
Lavoie, C;
Indirizzi:
Univ Laval, Ctr Rech Amenagement & Dev, Dept Amenagement, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 enagement, St Foy, PQ G1K 7P4, Canada
Titolo Testata:
HOLOCENE
fascicolo: 1, volume: 11, anno: 2001,
pagine: 89 - 99
SICI:
0959-6836(200101)11:1<89:RTLHOA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROUND-BEETLES COLEOPTERA; SPRUCE GROWTH FORMS; BOREAL FOREST; SEASONAL TEMPERATURES; POSTFIRE REGENERATION; TREE REGENERATION; NORTHERN QUEBEC; CLIMATE-CHANGE; CANADA; CARABIDAE;
Keywords:
Carabidae; fire; Formicidae; insects; macrofossils; palaeoentomology; Scolytidae; subalpine vegetation; late Holocene;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
73
Recensione:
Indirizzi per estratti:
Indirizzo: Lavoie, C Univ Laval, Ctr Rech Amenagement & Dev, Dept Amenagement, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 St Foy, PQ G1K 7P4, Canada
Citazione:
C. Lavoie, "Reconstructing the late-Holocene history of a subalpine environment (Charlevoix, Quebec) using fossil insects", HOLOCENE, 11(1), 2001, pp. 89-99

Abstract

In southern Quebec (Charlevoix, Canada), reconstructions of the subalpine insect assemblages were made in environments that were transformed by fire during the late Holocene (since 4500 BP). The ecological requirements of beetle species likely to be found as fossils were studied by collecting living beetles in pitfall traps in forest, subalpine and alpine environments. The late-Holocene changes of insect assemblages were reconstructed by recovering fossil insects from 13 pear sections. Modem beetle assemblages are valuable indicators of tree cover. Well-developed podzol soils under peat, as well as numerous spruce charcoal remains overlaying the podzol in all sampling sites, suggest that a dense spruce cover was present before the beginning of the accumulation of peat, and was eliminated by lire (4570-800 BP). Ground beetle and bark beetle assemblages at the base of the pear sections contained a mixture of forest and open-environment species, indicating that the postfire environment was a subalpine one with a tree cover of 30-50%. The most recent fire in the area (AD 1915) increased the openness of the landscape (tree cover <30%). Forest ground beetles and bark beetles disappearedalmost completely; only open-environment species remained. The late-Holocene history of the Charlevoix mountains as reconstructed using fossil insects is similar to that reconstructed using charcoal remains. However, fossil insects add significant information (tree cover, health of trees, forest composition) that is difficult to obtain using other macrofossils. This opensup new opportunities for palaeoecological studies in the boreal forest, which was formed during the Holocene epoch, and was frequently disturbed by fire and insect outbreaks.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:10:37