Epigean arthropod succession along a 154-year glacier foreland chronosequence in the Forni Valley (Central Italian Alps)
Articolo
Data di Pubblicazione:
2006
Citazione:
Epigean arthropod succession along a 154-year glacier foreland chronosequence in the Forni Valley (Central Italian Alps) / M. Gobbi, F. De Bernardi, M. Pelfini, B. Rossaro, P. Brandmayr. - In: ARCTIC ANTARCTIC AND ALPINE RESEARCH. - ISSN 1523-0430. - 38:3(2006 Aug), pp. 357-362.
Abstract:
The 154-year (1850–2004) chronosequence of the Forni Glacier foreland has been studied
by sampling ant, centipede, ground beetle, and spider species assemblages. Species
numbers increase with terrain age along the chronosequence from 2 to 26 on the oldest
soils. Thirty-nine species were collected; species richness and diversity (Shannon’s Index)
of communities are correlated to the year of soil deglaciation. Shannon Index values
increase with sites deglaciated between 1 and 61 years ago; sites deglaciated between
61 and 78 years ago produce similar values, and those deglaciated 78 to 154 years ago
show a further increase in diversity. Ground beetles and spiders are found at all sites, while
ants and centipedes were associated with mature forest soils. On the glacier surface,
pioneer species such as the wolf-spider Pardosa saturatior and the ground beetle
Oreonebria castanea permanently inhabit the supraglacial detritus surviving on trophic
resources. Wingless ground beetle species are associated with mature soils, especially
those with high hydric stability. Open land species typical of primary succession are found
in the pioneer and intermediate stages, while community assemblages found on older
terrain are linked to forest vegetation structure and dynamics.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
M. Gobbi, F. De Bernardi, M. Pelfini, B. Rossaro, P. Brandmayr
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