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Functional integrity of plant-pollinator communities in restored habitats in Mauritius


Kaiser, Christopher Niels. Functional integrity of plant-pollinator communities in restored habitats in Mauritius. 2006, University of Zurich, Faculty of Science.

Abstract

Die vorliegende Dissertation befasst sich mit den Wechselbeziehungen zwischen in Mauritius eingeführten und einheimischen Tier- und Pflanzenarten und den damit verbundenen mutualistischen Pflanze-Tier-Interaktionen. Es wurden vollständig quantifizierte Besucher-Netze verwendet, um Pflanze-Tier-Interaktionen auf der Ebene der Bestäuber- und Pflanzengemeinschaft zu untersuchen. Die Ergebnisse dieser Arbeit deuten darauf hin, dass die Mechanismen der biotische Bestäubung und Samenverbreitung einheimischer Pflanzen durch die Anwesenheit eingeführter Pflanzenarten indirekt beeinträchtigt werden. Die lokale Bestäuberfauna wurde von eingeführten Insekten dominiert, was auf eine erhebliche Störung der einheimischen, co-evolvierten Pflanze-Tier-Beziehung schliessen lässt.

This thesis investigates the effects of introduced plant and animal species on native mutualistic interactions in Mauritius. The Mauritian ecosystem is highly degraded by invasive alien plant species. Conservationists have established a habitat restoration scheme to conserve endemic plants. The consequences of this restoration for associated animals and the role of mutualists in fulfilling their previous ecosystem functions are largely unknown. The main results of this thesis include: 1. Bird pollination behaviour may be affected by restoration schemes, resulting in reduced pollination success of the endangered endemic S. mamillatum in restored habitat. 2. The Janzen-Connell model describes seedling establishment of S. mamillatum, and ecological analogue species may serve as seed dispersers. 3. There is little evidence for indirect competition for pollination between the invasive P. cattleianum and the endemic B. zaluzania. 4. Visitation webs of restored habitat were more complex than those of unrestored habitat, which may be critical for ecosystem stability. The dominance of introduced pollinators suggested strong competition with native pollinators, which may have resulted in the disruption of co-evolved plant-pollinator interactions. 5. Fluctuations in species diversity, connectance, degree distribution and nestedness in pollinator communities suggest that network stability may vary considerably both temporally and spatially.

Abstract

Die vorliegende Dissertation befasst sich mit den Wechselbeziehungen zwischen in Mauritius eingeführten und einheimischen Tier- und Pflanzenarten und den damit verbundenen mutualistischen Pflanze-Tier-Interaktionen. Es wurden vollständig quantifizierte Besucher-Netze verwendet, um Pflanze-Tier-Interaktionen auf der Ebene der Bestäuber- und Pflanzengemeinschaft zu untersuchen. Die Ergebnisse dieser Arbeit deuten darauf hin, dass die Mechanismen der biotische Bestäubung und Samenverbreitung einheimischer Pflanzen durch die Anwesenheit eingeführter Pflanzenarten indirekt beeinträchtigt werden. Die lokale Bestäuberfauna wurde von eingeführten Insekten dominiert, was auf eine erhebliche Störung der einheimischen, co-evolvierten Pflanze-Tier-Beziehung schliessen lässt.

This thesis investigates the effects of introduced plant and animal species on native mutualistic interactions in Mauritius. The Mauritian ecosystem is highly degraded by invasive alien plant species. Conservationists have established a habitat restoration scheme to conserve endemic plants. The consequences of this restoration for associated animals and the role of mutualists in fulfilling their previous ecosystem functions are largely unknown. The main results of this thesis include: 1. Bird pollination behaviour may be affected by restoration schemes, resulting in reduced pollination success of the endangered endemic S. mamillatum in restored habitat. 2. The Janzen-Connell model describes seedling establishment of S. mamillatum, and ecological analogue species may serve as seed dispersers. 3. There is little evidence for indirect competition for pollination between the invasive P. cattleianum and the endemic B. zaluzania. 4. Visitation webs of restored habitat were more complex than those of unrestored habitat, which may be critical for ecosystem stability. The dominance of introduced pollinators suggested strong competition with native pollinators, which may have resulted in the disruption of co-evolved plant-pollinator interactions. 5. Fluctuations in species diversity, connectance, degree distribution and nestedness in pollinator communities suggest that network stability may vary considerably both temporally and spatially.

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Additional indexing

Item Type:Dissertation (monographical)
Referees:Müller Christine Beatrice, Memmott Jane
Communities & Collections:UZH Dissertations
Dewey Decimal Classification:Unspecified
Language:English
Place of Publication:Zürich
Date:2006
Deposited On:20 Jun 2019 10:55
Last Modified:15 Apr 2021 14:58
Number of Pages:251
OA Status:Green

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