Predicting invasion in grassland ecosystems: is exotic dominance the real embarrassment of richness?

Seabloom, Eric W., Borer, Elizabeth T., Buckley, Yvonne, Cleland, Elsa E., Davies, Kendi, Firn, Jennifer, Harpole, W. Stanley, Hautier, Yann, Lind, Eric, Macdougall, Andrew, Orrock, John L., Prober, Suzanne M., Adler, Peter, Alberti, Juan, Anderson, T. Michael, Bakker, Jonathan D., Biederman, Lori A., Blumenthal, Dana, Brown, Cynthia S., Brudvig, Lars A., Caldeira, Maria, Chu, Chengjin, Crawley, Michael J., Daleo, Pedro, Damschen, Ellen I., D'Antonio, Carla M., Decrappeo, Nicole M., Dickman, Chris R., Du, Guozhen, Fay, Philip A., Frater, Paul, Gruner, Daniel S., Hagenah, Nicole, Hector, Andrew, Helm, Aveliina, Hillebrand, Helmut, Hofmockel, Kirsten S., Humphries, Hope C., Iribarne, Oscar, Jin, Virginia L., Kay, Adam, Kirkman, Kevin P., Klein, Julia A., Knops, Johannes M. H., La Pierre, Kimberly J., Ladwig, Laura M., Lambrinos, John G., Leakey, Andrew D. B., Li, Qi, Li, Wei, McCulley, Rebecca, Melbourne, Brett, Mitchell, Charles E., Moore, Joslin L., Morgan, John, Mortensen, Brent, O'Halloran, Lydia R., Pärtel, Meelis, Pascual, Jesús, Pyke, David A., Risch, Anita C., Salguero-Gomez, Roberto, Sankaran, Mahesh, Schuetz, Martin, Simonsen, Anna, Smith, Melinda, Stevens, Carly, Sullivan, Lauren, Wardle, Glenda M., Wolkovich, Elizabeth M., Wragg, Peter D., Wright, Justin and Yang, Louie (2013) Predicting invasion in grassland ecosystems: is exotic dominance the real embarrassment of richness?. Global Change Biology, 19 12: 3677-3687. doi:10.1111/gcb.12370

Author Seabloom, Eric W.
Borer, Elizabeth T.
Buckley, Yvonne
Cleland, Elsa E.
Davies, Kendi
Firn, Jennifer
Harpole, W. Stanley
Hautier, Yann
Lind, Eric
Macdougall, Andrew
Orrock, John L.
Prober, Suzanne M.
Adler, Peter
Alberti, Juan
Anderson, T. Michael
Bakker, Jonathan D.
Biederman, Lori A.
Blumenthal, Dana
Brown, Cynthia S.
Brudvig, Lars A.
Caldeira, Maria
Chu, Chengjin
Crawley, Michael J.
Daleo, Pedro
Damschen, Ellen I.
D'Antonio, Carla M.
Decrappeo, Nicole M.
Dickman, Chris R.
Du, Guozhen
Fay, Philip A.
Frater, Paul
Gruner, Daniel S.
Hagenah, Nicole
Hector, Andrew
Helm, Aveliina
Hillebrand, Helmut
Hofmockel, Kirsten S.
Humphries, Hope C.
Iribarne, Oscar
Jin, Virginia L.
Kay, Adam
Kirkman, Kevin P.
Klein, Julia A.
Knops, Johannes M. H.
La Pierre, Kimberly J.
Ladwig, Laura M.
Lambrinos, John G.
Leakey, Andrew D. B.
Li, Qi
Li, Wei
McCulley, Rebecca
Melbourne, Brett
Mitchell, Charles E.
Moore, Joslin L.
Morgan, John
Mortensen, Brent
O'Halloran, Lydia R.
Pärtel, Meelis
Pascual, Jesús
Pyke, David A.
Risch, Anita C.
Salguero-Gomez, Roberto
Sankaran, Mahesh
Schuetz, Martin
Simonsen, Anna
Smith, Melinda
Stevens, Carly
Sullivan, Lauren
Wardle, Glenda M.
Wolkovich, Elizabeth M.
Wragg, Peter D.
Wright, Justin
Yang, Louie
Title Predicting invasion in grassland ecosystems: is exotic dominance the real embarrassment of richness?
Journal name Global Change Biology   Check publisher's open access policy
ISSN 1354-1013
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1111/gcb.12370
Open Access Status Not yet assessed
Volume 19
Issue 12
Start page 3677
End page 3687
Total pages 11
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Language eng
Subject 2303 Ecology
2306 Global and Planetary Change
2300 Environmental Science
2304 Environmental Chemistry
Abstract Invasions have increased the size of regional species pools, but are typically assumed to reduce native diversity. However, global-scale tests of this assumption have been elusive because of the focus on exotic species richness, rather than relative abundance. This is problematic because low invader richness can indicate invasion resistance by the native community or, alternatively, dominance by a single exotic species. Here, we used a globally replicated study to quantify relationships between exotic richness and abundance in grass-dominated ecosystems in 13 countries on six continents, ranging from salt marshes to alpine tundra. We tested effects of human land use, native community diversity, herbivore pressure, and nutrient limitation on exotic plant dominance. Despite its widespread use, exotic richness was a poor proxy for exotic dominance at low exotic richness, because sites that contained few exotic species ranged from relatively pristine (low exotic richness and cover) to almost completely exotic-dominated ones (low exotic richness but high exotic cover). Both exotic cover and richness were predicted by native plant diversity (native grass richness) and land use (distance to cultivation). Although climate was important for predicting both exotic cover and richness, climatic factors predicting cover (precipitation variability) differed from those predicting richness (maximum temperature and mean temperature in the wettest quarter). Herbivory and nutrient limitation did not predict exotic richness or cover. Exotic dominance was greatest in areas with low native grass richness at the site- or regional-scale. Although this could reflect native grass displacement, a lack of biotic resistance is a more likely explanation, given that grasses comprise the most aggressive invaders. These findings underscore the need to move beyond richness as a surrogate for the extent of invasion, because this metric confounds monodominance with invasion resistance. Monitoring species' relative abundance will more rapidly advance our understanding of invasions.
Keyword Biodiversity Conservation
Environmental Sciences
Biodiversity & Conservation
Environmental Sciences & Ecology
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID NSF-DEB-1042132
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
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