Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands
Abstract Dominant vegetation in many ecosystems is an integral component of structure and habitat. In many drylands, native shrubs function as foundation species that benefit other plants and animals. However, invasive exotic plant species can comprise a significant proportion of the vegetation. In...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-04-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-59868-w |
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| author | C. J. Lortie Charlotte Brown Stephanie Haas-Desmarais Jacob Lucero Ragan Callaway Jenna Braun Alessandro Filazzola |
| author_facet | C. J. Lortie Charlotte Brown Stephanie Haas-Desmarais Jacob Lucero Ragan Callaway Jenna Braun Alessandro Filazzola |
| author_sort | C. J. Lortie |
| collection | DOAJ |
| description | Abstract Dominant vegetation in many ecosystems is an integral component of structure and habitat. In many drylands, native shrubs function as foundation species that benefit other plants and animals. However, invasive exotic plant species can comprise a significant proportion of the vegetation. In Central California drylands, the facilitative shrub Ephedra californica and the invasive Bromus rubens are widely dispersed and common. Using comprehensive survey data structured by shrub and open gaps for the region, we compared network structure with and without this native shrub canopy and with and without the invasive brome. The presence of the invasive brome profoundly shifted the network measure of centrality in the microsites structured by a shrub canopy (centrality scores increased from 4.3 under shrubs without brome to 6.3, i.e. a relative increase of 42%). This strongly suggests that plant species such as brome can undermine the positive and stabilizing effects of native foundation plant species provided by shrubs in drylands by changing the frequency that the remaining species connect to one another. The net proportion of positive and negative associations was consistent across all microsites (approximately 50% with a total of 14% non-random co-occurrences on average) suggesting that these plant-plant networks are rewired but not more negative. Maintaining resilience in biodiversity thus needs to capitalize on protecting native shrubs whilst also controlling invasive grass species particularly when associated with shrubs. |
| first_indexed | 2024-04-24T07:16:17Z |
| format | Article |
| id | doaj.art-69e39acf60994221ac6c937c6c99264d |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-24T07:16:17Z |
| publishDate | 2024-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-69e39acf60994221ac6c937c6c99264d2024-04-21T11:18:03ZengNature PortfolioScientific Reports2045-23222024-04-011411910.1038/s41598-024-59868-wPlant networks are more connected by invasive brome and native shrub facilitation in Central California drylandsC. J. Lortie0Charlotte Brown1Stephanie Haas-Desmarais2Jacob Lucero3Ragan Callaway4Jenna Braun5Alessandro Filazzola6Department of Biology, York UniversityDépartement de Biologie, Université de SherbrookeDepartment of Biology, York UniversityTexas A & M, Department of Rangeland, Wildlife and Fisheries ManagementDivision of Biological Sciences, University of MontanaDepartment of Biology, York UniversityApex Resource Management SolutionsAbstract Dominant vegetation in many ecosystems is an integral component of structure and habitat. In many drylands, native shrubs function as foundation species that benefit other plants and animals. However, invasive exotic plant species can comprise a significant proportion of the vegetation. In Central California drylands, the facilitative shrub Ephedra californica and the invasive Bromus rubens are widely dispersed and common. Using comprehensive survey data structured by shrub and open gaps for the region, we compared network structure with and without this native shrub canopy and with and without the invasive brome. The presence of the invasive brome profoundly shifted the network measure of centrality in the microsites structured by a shrub canopy (centrality scores increased from 4.3 under shrubs without brome to 6.3, i.e. a relative increase of 42%). This strongly suggests that plant species such as brome can undermine the positive and stabilizing effects of native foundation plant species provided by shrubs in drylands by changing the frequency that the remaining species connect to one another. The net proportion of positive and negative associations was consistent across all microsites (approximately 50% with a total of 14% non-random co-occurrences on average) suggesting that these plant-plant networks are rewired but not more negative. Maintaining resilience in biodiversity thus needs to capitalize on protecting native shrubs whilst also controlling invasive grass species particularly when associated with shrubs.https://doi.org/10.1038/s41598-024-59868-wAnnual plantCommunity ecologyFacilitationFoundation speciesInvasionNetwork analyses |
| spellingShingle | C. J. Lortie Charlotte Brown Stephanie Haas-Desmarais Jacob Lucero Ragan Callaway Jenna Braun Alessandro Filazzola Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands Scientific Reports Annual plant Community ecology Facilitation Foundation species Invasion Network analyses |
| title | Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands |
| title_full | Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands |
| title_fullStr | Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands |
| title_full_unstemmed | Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands |
| title_short | Plant networks are more connected by invasive brome and native shrub facilitation in Central California drylands |
| title_sort | plant networks are more connected by invasive brome and native shrub facilitation in central california drylands |
| topic | Annual plant Community ecology Facilitation Foundation species Invasion Network analyses |
| url | https://doi.org/10.1038/s41598-024-59868-w |
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