Short-term recovery of benthos following disturbance from stream habitat rehabilitation
Identifieur interne : 001343 ( Main/Exploration ); précédent : 001342; suivant : 001344Short-term recovery of benthos following disturbance from stream habitat rehabilitation
Auteurs : Pertti Tikkanen [Finlande] ; Pekka Laasonen [Finlande] ; Timo Muotka [Finlande] ; Arto Huhta [Finlande] ; Kalevi Kuusela [Finlande]Source :
- Hydrobiologia [ 0018-8158 ] ; 1994-01-01.
English descriptors
Abstract
Abstract: The recovery of benthic macroinvertebrates after disturbance from stream rehabilitation was studied in the River Livojoki, northern Finland. The stream that had been channelized for log transport was rehabilitated on 1 July 1992 by digging holes and inserting boulders. We measured habitat characteristics and sampled benthic animals before and after rehabilitation, including an unrehabilitated control site. The immediate effect of rehabilitation was a slight decrease in the abundances of benthic insects. Recolonization occurred rapidly, within 10 days. Disturbance of the rehabilitation did not have a detectable effect on the macroinvertebrate community. Most species-level changes and community patterns reflected seasonal life history events. Timing of such rehabilitation work can be critical for the recovery rate, which depends on the colonization abilities of the species present after disturbance. We suggest that many disturbances (including minor floods and moderate rehabilitation procedures) may have only small, short-term effects on benthic communities. We emphasize the importance of considering seasonality in studies of disturbance in streams.
Url:
DOI: 10.1007/BF00006854
Affiliations:
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rehabilitation</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: The recovery of benthic macroinvertebrates after disturbance from stream rehabilitation was studied in the River Livojoki, northern Finland. The stream that had been channelized for log transport was rehabilitated on 1 July 1992 by digging holes and inserting boulders. We measured habitat characteristics and sampled benthic animals before and after rehabilitation, including an unrehabilitated control site. The immediate effect of rehabilitation was a slight decrease in the abundances of benthic insects. Recolonization occurred rapidly, within 10 days. Disturbance of the rehabilitation did not have a detectable effect on the macroinvertebrate community. Most species-level changes and community patterns reflected seasonal life history events. Timing of such rehabilitation work can be critical for the recovery rate, which depends on the colonization abilities of the species present after disturbance. We suggest that many disturbances (including minor floods and moderate rehabilitation procedures) may have only small, short-term effects on benthic communities. We emphasize the importance of considering seasonality in studies of disturbance in streams.</div></front></TEI><affiliations><list><country><li>Finlande</li></country><region><li>Finlande-Centrale</li></region><settlement><li>Jyväskylä</li></settlement><orgName><li>Université de Jyväskylä</li></orgName></list><tree><country name="Finlande"><noRegion><name sortKey="Tikkanen, Pertti" sort="Tikkanen, Pertti" uniqKey="Tikkanen P" first="Pertti" last="Tikkanen">Pertti Tikkanen</name></noRegion><name sortKey="Huhta, Arto" sort="Huhta, Arto" uniqKey="Huhta A" first="Arto" last="Huhta">Arto Huhta</name><name sortKey="Kuusela, Kalevi" sort="Kuusela, Kalevi" uniqKey="Kuusela K" first="Kalevi" last="Kuusela">Kalevi Kuusela</name><name sortKey="Laasonen, Pekka" sort="Laasonen, Pekka" uniqKey="Laasonen P" first="Pekka" last="Laasonen">Pekka Laasonen</name><name sortKey="Muotka, Timo" sort="Muotka, Timo" uniqKey="Muotka T" first="Timo" last="Muotka">Timo Muotka</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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