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Human impact, climate and dispersal strategies determine plant invasion on islands

Title data

Irl, Severin D. H. ; Schweiger, Andreas H. ; Steinbauer, Manuel J. ; Ah‐Peng, Claudine ; Arévalo, José Ramón ; Beierkuhnlein, Carl ; Chiarucci, Alessandro ; Daehler, Curtis C. ; Fernández‐Palacios, José María ; Flores, Olivier ; Kueffer, Christoph ; Maděra, Petr ; Otto, Rüdiger ; Schweiger, Julienne I.-M. ; Strasberg, Dominique ; Jentsch, Anke ; Lavergne, Sebastien:
Human impact, climate and dispersal strategies determine plant invasion on islands.
In: Journal of Biogeography. (May 2021) . - 15 S..
ISSN 0305-0270
DOI: https://doi.org/10.1111/jbi.14119

Abstract in another language

Aim
Biological invasions are likely determined by species dispersal strategies as well as environmental characteristics of a recipient region, especially climate and human impact. However, the contribution of climatic factors, human impact, and dispersal strategies in driving invasion processes is still controversial and not well embedded in the existing theoretical considerations. Here, we study how climate, species dispersal strategies, and human impact determine plant invasion processes on islands distributed in all major oceans in the context of directional ecological filtering.
Location
Six mountainous, tropical, and subtropical islands in three major oceans: Island of Hawai'i and Maui (Pacific), Tenerife and La Palma (Atlantic), and La Réunion and Socotra (Indian Ocean).
Taxon
Vascular Plants.
Methods
We recorded 360 non‐native species in 218 plots along roadside elevational transects covering the major temperature, precipitation and human impact (i.e., road density) gradients of the islands. We collected dispersal strategies for a majority of the recorded species and calculated the environmental niche per species using a hypervolume approach.
Results
Non‐native species’ generalism (i.e., mean community niche width) increased with precipitation, elevation and human impact but showed no relationship with temperature. Increasing precipitation led to environmental filtering of non‐native species resulting in more generalist species under high precipitation conditions. We found no directional filtering for temperature but an optimum range of most species between 10 and 20°C. Niche widths of non‐native species increased with the prevalence of certain dispersal strategies, particularly anemochory and anthropochory.
Main conclusions
Plant invasion on tropical and subtropical islands seems to be mainly driven by precipitation and human impact, while temperature seems to be of little importance. Furthermore, anemochory and anthropochory are dispersal strategies associated with large niche widths of non‐native species. Our study allows a more detailed look at the mechanisms behind directional ecological filtering of non‐native plant species in non‐temperature‐limited ecosystems.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Biogeography; Climate; Dispersal; Invasion ecology; Island; Niche; Plant functional traits; Roads
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography > Chair Biogeography - Univ.-Prof. Dr. Carl Beierkuhnlein
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Disturbance Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Disturbance Ecology > Professor Disturbance Ecology - Univ.-Prof. Dr. Anke Jentsch
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
500 Science > 580 Plants (Botany)
500 Science > 590 Animals (Zoology)
Date Deposited: 05 May 2021 08:09
Last Modified: 05 May 2021 08:09
URI: https://eref.uni-bayreuth.de/id/eprint/65091