DOI: 10.1111/gcb.12780
论文题名: Anomalous droughts, not invasion, decrease persistence of native fishes in a desert river
作者: Ruhí A. ; Holmes E.E. ; Rinne J.N. ; Sabo J.L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 4 起始页码: 1482
结束页码: 1496
语种: 英语
英文关键词: MARSS
; Ecohydrology
; Environmental variation
; Global change
; Stream fish
; Time-series analyses
Scopus关键词: abundance
; drought
; ecohydrology
; fish
; flood
; freshwater ecosystem
; global change
; native species
; time series analysis
; Arizona
; United States
; Pisces
; animal
; Arizona
; biodiversity
; biological model
; desert climate
; drought
; fish
; flooding
; Fourier analysis
; introduced species
; multivariate analysis
; physiology
; population density
; river
; Animals
; Arizona
; Biodiversity
; Desert Climate
; Droughts
; Fishes
; Floods
; Fourier Analysis
; Introduced Species
; Models, Biological
; Multivariate Analysis
; Population Density
; Rivers
英文摘要: Changing climate extremes and invasion by non-native species are two of the most prominent threats to native faunas. Predicting the relationships between global change and native faunas requires a quantitative toolkit that effectively links the timing and magnitude of extreme events to variation in species abundances. Here, we examine how discharge anomalies - unexpected floods and droughts - determine covariation in abundance of native and non-native fish species in a highly variable desert river in Arizona. We quantified stochastic variation in discharge using Fourier analyses on >15 000 daily observations. We subsequently coupled maximum annual spectral anomalies with a 15-year time series of fish abundances (1994-2008), using Multivariate Autoregressive State-Space (MARSS) models. Abiotic drivers (discharge anomalies) were paramount in determining long-term fish abundances, whereas biotic drivers (species interactions) played only a secondary role. As predicted, anomalous droughts reduced the abundances of native species, while floods increased them. However, in contrast to previous studies, we observed that the non-native assemblage was surprisingly unresponsive to extreme events. Biological trait analyses showed that functional uniqueness was higher in native than in non-native fishes. We also found that discharge anomalies influenced diversity patterns at the meta-community level, with nestedness increasing after anomalous droughts due to the differential impairment of native species. Overall, our results advance the notion that discharge variation is key in determining community trajectories in the long term, predicting the persistence of native fauna even in the face of invasion. We suggest this variation, rather than biotic interactions, may commonly underlie covariation between native and non-native faunas, especially in highly variable environments. If droughts become increasingly severe due to climate change, and floods increasingly muted due to regulation, fish assemblages in desert rivers may become taxonomically and functionally impoverished and dominated by non-native taxa. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61790
Appears in Collections: 影响、适应和脆弱性
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作者单位: Global Institute of Sustainability, Arizona State University, Tempe, AZ, United States; Northwest Fisheries Science Center, NOAA Fisheries Service, Seattle, WA, United States; Southwest Forest Science Complex, Rocky Mountain Research Station, Flagstaff, AZ, United States; School of Life Sciences, Arizona State University, Tempe, AZ, United States
Recommended Citation:
Ruhí A.,Holmes E.E.,Rinne J.N.,et al. Anomalous droughts, not invasion, decrease persistence of native fishes in a desert river[J]. Global Change Biology,2015-01-01,21(4)