Demographic effects of large, introduced herbivores on a long-lived endemic plant

The introduction of alien ungulates is a major threat for the survival of endangered plants, especially in island ecosystems. However, very few studies have investigated the potential damage of large herbivores on plant diversity in Mediterranean protected areas. In this study, we describe the popul...

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Published in:Plant ecology 2012-10, Vol.213 (10), p.1543-1553
Main Authors: Pisanu, Stefania, Farris, Emmanuele, Filigheddu, Rossella, García, Maria Begoña
Format: Article
Language:English
Subjects:
Analysis
Animal populations
Applied Ecology
Asteraceae
Biodiversity
Biodiversity conservation
Biomedical and Life Sciences
Centaurea
Community & Population Ecology
Deer
Demographics
Demography
Ecology
Ecosystems
Endangered species
Flowers & plants
Habitat conservation
Herbivores
Life Sciences
Plant biodiversity
Plant Ecology
Plants
Population growth rate
Protection and preservation
Seedlings
Terrestial Ecology
Ungulates
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description The introduction of alien ungulates is a major threat for the survival of endangered plants, especially in island ecosystems. However, very few studies have investigated the potential damage of large herbivores on plant diversity in Mediterranean protected areas. In this study, we describe the population structure and the long-term dynamics of the main populations of the Sardinian narrow endemic Centaurea horrìda Bad. (Asteraceae), by means of permanent plots where individual plants were tagged and monitored through 6 years (2004-2009). We monitored this endangered plant at three sites: two were protected areas where introduced and feral ungulates are present, and the other one was a non-protected site without introduced ungulates. We found that adults and saplings were more abundant at the non-protected site. Through matrix models, we also highlighted that the non-protected population showed the highest population growth rate. Finally, by means of an exclusion experiment for ungulates at one protected site, we demonstrated that herbivores had a negative effect on the survival of seedlings and adult plants, and reduced the stochastic population growth rate. An LTRE analysis showed that differences in the survival, especially of adult individuals, had the highest responsibility in explaining the higher population growth rate when herbivores are excluded. Our study constitutes a clear example on how the protection of alien large herbivores can have opposite effects on the conservation of an endangered plant. Some management options are proposed, and the urgent need of manipulative experiments on speciesspecific interactions between protected plants and alien herbivore species is invoked.
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source JSTOR Archival Journals and Primary Sources Collection; Springer Nature:Jisc Collections:Springer Nature Read and Publish 2023-2025: Springer Reading List
subjects Analysis
Animal populations
Applied Ecology
Asteraceae
Biodiversity
Biodiversity conservation
Biomedical and Life Sciences
Centaurea
Community & Population Ecology
Deer
Demographics
Demography
Ecology
Ecosystems
Endangered species
Flowers & plants
Habitat conservation
Herbivores
Life Sciences
Plant biodiversity
Plant Ecology
Plants
Population growth rate
Protection and preservation
Seedlings
Terrestial Ecology
Ungulates
title Demographic effects of large, introduced herbivores on a long-lived endemic plant
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