DOI: 10.1111/gcb.13006
论文题名: Decadal-scale rates of reef erosion following El Niño-related mass coral mortality
作者: Roff G. ; Zhao J.-X. ; Mumby P.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 12 起始页码: 4415
结束页码: 4424
语种: 英语
英文关键词: Bioerosion
; Caribbean
; Coral
; Coral bleaching
; Framework
; Herbivory
; Orbicella
Scopus关键词: bioerosion
; coral bleaching
; coral reef
; decadal variation
; El Nino
; grazing
; herbivory
; mass mortality
; perciform
; Atlantic Ocean
; Belize [Central America]
; Caribbean Sea
; Anthozoa
; Scaridae
; animal
; Anthozoa
; Belize
; biological model
; climate change
; coral reef
; El Nino
; herbivory
; Perciformes
; physiology
; Animals
; Anthozoa
; Belize
; Climate Change
; Coral Reefs
; El Nino-Southern Oscillation
; Herbivory
; Models, Biological
; Perciformes
英文摘要: As the frequency and intensity of coral mortality events increase under climate change, understanding how declines in coral cover may affect the bioerosion of reef frameworks is of increasing importance. Here, we explore decadal-scale rates of bioerosion of the framework building coral Orbicella annularis by grazing parrotfish following the 1997/1998 El Niño-related mass mortality event at Long Cay, Belize. Using high-precision U-Th dating and CT scan analysis, we quantified in situ rates of external bioerosion over a 13-year period (1998-2011). Based upon the error-weighted average U-Th age of dead O. annularis skeletons, we estimate the average external bioerosion between 1998 and 2011 as 0.92 ± 0.55 cm depth. Empirical observations of herbivore foraging, and a nonlinear numerical response of parrotfish to an increase in food availability, were used to create a model of external bioerosion at Long Cay. Model estimates of external bioerosion were in close agreement with U-Th estimates (0.85 ± 0.09 cm). The model was then used to quantify how rates of external bioerosion changed across a gradient of coral mortality (i.e., from few corals experiencing mortality following coral bleaching to complete mortality). Our results indicate that external bioerosion is remarkably robust to declines in coral cover, with no significant relationship predicted between the rate of external bioerosion and the proportion of O. annularis that died in the 1998 bleaching event. The outcome was robust because the reduction in grazing intensity that follows coral mortality was compensated for by a positive numerical response of parrotfish to an increase in food availability. Our model estimates further indicate that for an O. annularis-dominated reef to maintain a positive state of reef accretion, a necessity for sustained ecosystem function, live cover of O. annularis must not drop below a ~5-10% threshold of cover. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61600
Appears in Collections: 影响、适应和脆弱性
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作者单位: Marine Spatial Ecology Lab, School of Biological Sciences, University of Queensland, St. Lucia, QLD, Australia; School of Earth Sciences, The University of Queensland, Brisbane, QLD, Australia
Recommended Citation:
Roff G.,Zhao J.-X.,Mumby P.J.. Decadal-scale rates of reef erosion following El Niño-related mass coral mortality[J]. Global Change Biology,2015-01-01,21(12)