TY - JOUR
T1 - Nutrient addition drives declines in grassland species richness primarily via enhanced species loss
AU - Muehleisen, Andrew J.
AU - Watkins, Carmen R.E.
AU - Altmire, Gabriella R.
AU - Shaw, E. Ashley
AU - Case, Madelon F.
AU - Aoyama, Lina
AU - Brambila, Alejandro
AU - Reed, Paul B.
AU - LaForgia, Marina
AU - Borer, Elizabeth T.
AU - Seabloom, Eric W.
AU - Bakker, Jonathan D.
AU - Amillas, Carlos Alberto
AU - Biederman, Lori
AU - Chen, Qingqing
AU - Cleland, Elsa E.
AU - Fay, Philip A.
AU - Hagenah, Nicole
AU - Harpole, Stan
AU - Hautier, Yann
AU - Henning, Jeremiah A.
AU - Knops, Johannes M.H.
AU - Komatsu, Kimberly J.
AU - Ladouceur, Emma
AU - MacDougall, Andrew
AU - McCulley, Rebecca L.
AU - Moore, Joslin L.
AU - Ohlert, Tim
AU - Power, Sally A.
AU - Stevens, Carly J.
AU - Wilfahrt, Peter
AU - Hallett, Lauren M.
N1 - Funding Information:
This work was generated using data from the Nutrient Network ( http://www.nutnet.org ) experiment, funded at the site‐scale by individual researchers. Coordination and data management have been supported by funding to E. Borer and E. Seabloom from the National Science Foundation Research Coordination Network (NSF‐DEB‐1042132) and Long Term Ecological Research (NSF‐DEB‐1234162 to Cedar Creek LTER) programs, and the Institute on the Environment (DG‐0001‐13). We also thank the Minnesota Supercomputer Institute for hosting project data and the Institute on the Environment for hosting Network meetings. Soil analyses were supported, in part, by ‐ARS grant 58‐3098‐7‐007 to ETB. This work was further funded by an NSF Career Grant to Lauren M. Hallett (NSF DEB‐2047239). USDA
Publisher Copyright:
© 2022 The Authors. Journal of Ecology © 2022 British Ecological Society.
PY - 2023/3
Y1 - 2023/3
N2 - Declines in grassland diversity in response to nutrient addition are a general consequence of global change. This decline in species richness may be driven by multiple underlying processes operating at different time-scales. Nutrient addition can reduce diversity by enhancing the rate of local extinction via competitive exclusion, or by reducing the rate of colonization by constraining the pool of species able to colonize under new conditions. Partitioning net change into extinction and colonization rates will better delineate the long-term effect of global change in grasslands. We synthesized changes in richness in response to experimental fertilization with nitrogen, phosphorus and potassium with micronutrients across 30 grasslands. We quantified changes in local richness, colonization, and extinction over 8–10 years of nutrient addition, and compared these rates against control conditions to isolate the effect of nutrient addition from background dynamics. Total richness at steady state in the control plots was the sum of equal, relatively high rates of local colonization and extinction. On aggregate, 30%–35% of initial species were lost and the same proportion of new species were gained at least once over a decade. Absolute turnover increased with site-level richness but was proportionately greater at lower-richness sites relative to starting richness. Loss of total richness with nutrient addition, especially N in combination with P or K, was driven by enhanced rates of extinction with a smaller contribution from reduced colonization. Enhanced extinction and reduced colonization were disproportionately among native species, perennials, and forbs. Reduced colonization plateaued after the first few (<5) years after nutrient addition, while enhanced extinction continued throughout the first decade. Synthesis. Our results indicate a high rate of colonizations and extinctions underlying the richness of ambient communities and that nutrient enhancement drives overall declines in diversity primarily by exclusion of previously established species. Moreover, enhanced extinction continues over long time-scales, suggesting continuous, long-term community responses and a need for long-term study to fully realize the extinction impact of increased nutrients on grassland composition.
AB - Declines in grassland diversity in response to nutrient addition are a general consequence of global change. This decline in species richness may be driven by multiple underlying processes operating at different time-scales. Nutrient addition can reduce diversity by enhancing the rate of local extinction via competitive exclusion, or by reducing the rate of colonization by constraining the pool of species able to colonize under new conditions. Partitioning net change into extinction and colonization rates will better delineate the long-term effect of global change in grasslands. We synthesized changes in richness in response to experimental fertilization with nitrogen, phosphorus and potassium with micronutrients across 30 grasslands. We quantified changes in local richness, colonization, and extinction over 8–10 years of nutrient addition, and compared these rates against control conditions to isolate the effect of nutrient addition from background dynamics. Total richness at steady state in the control plots was the sum of equal, relatively high rates of local colonization and extinction. On aggregate, 30%–35% of initial species were lost and the same proportion of new species were gained at least once over a decade. Absolute turnover increased with site-level richness but was proportionately greater at lower-richness sites relative to starting richness. Loss of total richness with nutrient addition, especially N in combination with P or K, was driven by enhanced rates of extinction with a smaller contribution from reduced colonization. Enhanced extinction and reduced colonization were disproportionately among native species, perennials, and forbs. Reduced colonization plateaued after the first few (<5) years after nutrient addition, while enhanced extinction continued throughout the first decade. Synthesis. Our results indicate a high rate of colonizations and extinctions underlying the richness of ambient communities and that nutrient enhancement drives overall declines in diversity primarily by exclusion of previously established species. Moreover, enhanced extinction continues over long time-scales, suggesting continuous, long-term community responses and a need for long-term study to fully realize the extinction impact of increased nutrients on grassland composition.
KW - dynamic equilibrium
KW - grasslands
KW - nutrient enrichment
KW - Nutrient Network (NutNet)
KW - plant population and community dynamics
KW - richness
KW - turnover
UR - http://www.scopus.com/inward/record.url?scp=85143234192&partnerID=8YFLogxK
U2 - 10.1111/1365-2745.14038
DO - 10.1111/1365-2745.14038
M3 - Article
AN - SCOPUS:85143234192
SN - 0022-0477
VL - 111
SP - 552
EP - 563
JO - Journal of Ecology
JF - Journal of Ecology
IS - 3
ER -