Invasive congeners differ in successional impacts across space and time.
| Title: | Invasive congeners differ in successional impacts across space and time. |
|---|---|
| Authors: | Aaron S David, Phoebe L Zarnetske, Sally D Hacker, Peter Ruggiero, Reuben G Biel, Eric W Seabloom |
| Source: | PLoS ONE, Vol 10, Iss 2, p e0117283 (2015) |
| Publisher Information: | Public Library of Science (PLoS), 2015. |
| Publication Year: | 2015 |
| Collection: | LCC:Medicine LCC:Science |
| Subject Terms: | Medicine, Science |
| More Details: | Invasive species can alter the succession of ecological communities because they are often adapted to the disturbed conditions that initiate succession. The extent to which this occurs may depend on how widely they are distributed across environmental gradients and how long they persist over the course of succession. We focus on plant communities of the USA Pacific Northwest coastal dunes, where disturbance is characterized by changes in sediment supply, and the plant community is dominated by two introduced grasses--the long-established Ammophila arenaria and the currently invading A. breviligulata. Previous studies showed that A. breviligulata has replaced A. arenaria and reduced community diversity. We hypothesize that this is largely due to A. breviligulata occupying a wider distribution across spatial environmental gradients and persisting in later-successional habitat than A. arenaria. We used multi-decadal chronosequences and a resurvey study spanning 2 decades to characterize distributions of both species across space and time, and investigated how these distributions were associated with changes in the plant community. The invading A. breviligulata persisted longer and occupied a wider spatial distribution across the dune, and this corresponded with a reduction in plant species richness and native cover. Furthermore, backdunes previously dominated by A. arenaria switched to being dominated by A. breviligulata, forest, or developed land over a 23-yr period. Ammophila breviligulata likely invades by displacing A. arenaria, and reduces plant diversity by maintaining its dominance into later successional backdunes. Our results suggest distinct roles in succession, with A. arenaria playing a more classically facilitative role and A. breviligulata a more inhibitory role. Differential abilities of closely-related invasive species to persist through time and occupy heterogeneous environments allows for distinct impacts on communities during succession. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1932-6203 65457692 |
| Relation: | http://europepmc.org/articles/PMC4319750?pdf=render; https://doaj.org/toc/1932-6203 |
| DOI: | 10.1371/journal.pone.0117283 |
| Access URL: | https://doaj.org/article/be2a0c458d654576922a9ac9ba968ac3 |
| Accession Number: | edsdoj.be2a0c458d654576922a9ac9ba968ac3 |
| Database: | Directory of Open Access Journals |
| ISSN: | 19326203 65457692 |
|---|---|
| DOI: | 10.1371/journal.pone.0117283 |
| Published in: | PLoS ONE |
| Language: | English |