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Titolo:
No general edge effects for invertebrates at Afromontane forest/grassland ecotones
Autore:
Kotze, DJ; Samways, MJ;
Indirizzi:
Univ Natal, Sch Bot & Zool, Invertebrate Conservat Res Ctr, ZA-3209 Pietermaritzburg, South Africa Univ Natal Pietermaritzburg South Africa ZA-3209aritzburg, South Africa
Titolo Testata:
BIODIVERSITY AND CONSERVATION
fascicolo: 3, volume: 10, anno: 2001,
pagine: 443 - 466
SICI:
0960-3115(200103)10:3<443:NGEEFI>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROUND BEETLES COLEOPTERA; RAIN-FOREST; CONSERVATION; VEGETATION; PREDATION; FRAGMENTATION; DETERMINANTS; COMMUNITIES; CARABIDAE; LANDSCAPE;
Keywords:
Afromontane region; biodiversity conservation; ecotone; edge effect; epigaeic invertebrates;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Kotze, DJ Univ Helsinki, Dept Systemat & Ecol, POB 17, FIN-00014 Helsinki,Finland Univ Helsinki POB 17 Helsinki Finland FIN-00014 lsinki, Finland
Citazione:
D.J. Kotze e M.J. Samways, "No general edge effects for invertebrates at Afromontane forest/grassland ecotones", BIODIVERS C, 10(3), 2001, pp. 443-466

Abstract

The Afromontane region of South Africa is characterised by numerous small,remnant forests in a grassland matrix. The edges, or ecotones between forests and grasslands are usually sharp (typically just over a few metres) andare mainly maintained by both natural and, more recently, anthropogenic fires. We investigated epigaeic amphipod, carabid and ant distribution patterns across Afromontane forest/grassland ecotones and found little evidence to support the biological edge effect. Five of the fifty-two sampled specieshowever, did increase significantly in abundance at the ecotone. Among these was a very distinct edge species, the amphipod Talistroides africana. Overall, carabids were more abundant and species rich in forests while for ants it was in the grasslands. Ants and carabids were both more abundant and species rich in spring and summer than in autumn and winter. More interestingly, the abundance and species richness patterns across the ecotone did not change with the passing of the seasons. We argue that a conservation strategy for the Afromontane forest patches must also incorporate the surrounding grassland. The grassland habitat is often perceived as less valuable than forest and, as a consequence, is subject to many anthropogenic disturbances such as fragmentation, cattle grazing and afforestation. Protecting grasslands around forest patches not only conserves the rich ant diversity, butalso conserves the biota in the forests and at the edges, and would therefore be more meaningful in terms of the overall conservation of Afromontane biodiversity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:07:56