Arid
DOI10.1371/journal.pone.0123949
Response of a Stoichiometrically Imbalanced Ecosystem to Manipulation of Nutrient Supplies and Ratios
Lee, Zarraz M.1; Steger, Laura1; Corman, Jessica R.1; Neveu, Marc2; Poret-Peterson, Amisha T.2; Souza, Valeria3; Elser, James J.1
通讯作者Lee, Zarraz M.
来源期刊PLOS ONE
ISSN1932-6203
出版年2015
卷号10期号:4
英文摘要

Cuatro Cienegas Basin (CCB) is a desert ecosystem that hosts a large diversity of water bodies. Many surface waters in this basin have imbalanced nitrogen (N) to phosphorus (P) stoichiometry (total N:P > 100 by atoms), where P is likely to be a limiting nutrient. To investigate the effects of nutrient stoichiometry on planktonic and sediment ecosystem components and processes, we conducted a replicated in situ mesocosm experiment in Lagunita, a shallow pond located in the southwest region of the basin. Inorganic N and P were periodically added to mesocosms under three different N:P regimes (P only, N:P = 16 and N:P = 75) while the control mesocosms were left unamended. After three weeks of fertilization, more than two thirds of the applied P was immobilized into seston or sediment. The rapid uptake of P significantly decreased biomass C:P and N:P ratios, supporting the hypothesis that Lagunita is P-limited. Meanwhile, simultaneous N and P enrichment significantly enhanced planktonic growth, increasing total planktonic biomass by more than 2-fold compared to the unenriched control. With up to 76% of added N sequestered into the seston, it is suspected that the Lagunita microbial community also experienced strong N-limitation. However, when N and P were applied at N:P = 75, the microbes remained in a P-limitation state as in the untreated control. Two weeks after the last fertilizer application, seston C:P and N:P ratios returned to initial levels but chlorophyll a and seston C concentrations remained elevated. Additionally, no P release from the sediment was observed in the fertilized mesocosms. Overall, this study provides evidence that Lagunita is highly sensitive to nutrient perturbation because the biota is primarily P-limited and experiences a secondary N-limitation despite its high TN:TP ratio. This study serves as a strong basis to justify the need for protection of CCB ecosystems and other low-nutrient microbe-dominated systems from anthropogenic inputs of both N and P.


类型Article
语种英语
国家USA ; Mexico
收录类别SCI-E
WOS记录号WOS:000353016500074
WOS关键词SHALLOW LAKES ; FRESH-WATER ; PHOSPHORUS LIMITATION ; CUATRO CIENEGAS ; NITROGEN ; EUTROPHICATION ; PHYTOPLANKTON ; TERRESTRIAL ; COMMUNITIES ; WETLANDS
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
来源机构Arizona State University ; Universidad Nacional Autónoma de México
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189758
作者单位1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85281 USA;
2.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA;
3.Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico
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Lee, Zarraz M.,Steger, Laura,Corman, Jessica R.,et al. Response of a Stoichiometrically Imbalanced Ecosystem to Manipulation of Nutrient Supplies and Ratios[J]. Arizona State University, Universidad Nacional Autónoma de México,2015,10(4).
APA Lee, Zarraz M..,Steger, Laura.,Corman, Jessica R..,Neveu, Marc.,Poret-Peterson, Amisha T..,...&Elser, James J..(2015).Response of a Stoichiometrically Imbalanced Ecosystem to Manipulation of Nutrient Supplies and Ratios.PLOS ONE,10(4).
MLA Lee, Zarraz M.,et al."Response of a Stoichiometrically Imbalanced Ecosystem to Manipulation of Nutrient Supplies and Ratios".PLOS ONE 10.4(2015).
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