DOI: 10.1111/gcb.12040
论文题名: Glacier melting and stoichiometric implications for lake community structure: Zooplankton species distributions across a natural light gradient
作者: Laspoumaderes C. ; Modenutti B. ; Souza M.S. ; Bastidas Navarro M. ; Cuassolo F. ; Balseiro E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 1 起始页码: 316
结束页码: 326
语种: 英语
英文关键词: Boeckella gracilipes
; Daphnia commutata
; Food quality
; Glacial clay
; Light : nutrient hypothesis
; Phosphorus
; Receiving environments
; Turbidity
Scopus关键词: carbon
; community structure
; dominance
; environmental gradient
; environmental impact
; food quality
; glacier
; lake ecosystem
; light effect
; meltwater
; oligotrophic environment
; phosphorus
; stoichiometry
; zooplankton
; animal
; article
; classification
; ice cover
; lake
; light
; species difference
; zooplankton
; Animals
; Ice Cover
; Lakes
; Light
; Species Specificity
; Zooplankton
; Patagonia
; Boeckella gracilipes
; Copepoda
; Daphnia
; Daphnia commutata
英文摘要: Glaciers around the globe are melting rapidly, threatening the receiving environments of the world's fresh water reservoirs with significant changes. The meltwater, carried by rivers, contains large amounts of suspended sediment particles, producing longitudinal gradients in the receiving lakes. These gradients may result in changes in the light : nutrient ratio that affect grazer performance by altering elemental food quality. Thus, glacial melting may induce a shift in the phytoplankton carbon : nutrient ratio and hence influence the dominance of herbivorous zooplankton through stoichiometric mechanisms. To test this hypothesis, we combined field and experimental data, taking advantage of a natural light intensity gradient caused by glacial clay input in a deep oligotrophic Patagonian lake. Across this gradient, we evaluated the abundances of two consumer taxa with different phosphorus requirements, the copepod Boeckella gracilipes and the cladoceran Daphnia commutata, using a six-station transect along the lake. We found significant differences in light : nutrient ratio and stoichiometric food quality of the seston, together with a switch from dominance of P-rich Daphnia in low carbon : nutrient stations to dominance of low-P copepods in high carbon : nutrient stations. The laboratory experiments confirmed that the difference in the carbon : nutrient ratio across the gradient is sufficient to impair Daphnia growth. The overall patterns are consistent with our prediction that shifts in the environmental light : nutrient ratio as a result of glacial melting would contribute to shifts in the dominance of stoichiometrically contrasting taxa in consumer guilds. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62555
Appears in Collections: 影响、适应和脆弱性
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作者单位: Laboratorio de Limnología, INIBIOMA, CONICET-UNComahue, Quintral 1250, Bariloche 8400, Argentina
Recommended Citation:
Laspoumaderes C.,Modenutti B.,Souza M.S.,et al. Glacier melting and stoichiometric implications for lake community structure: Zooplankton species distributions across a natural light gradient[J]. Global Change Biology,2013-01-01,19(1)