| DOI: | 10.1016/j.scitotenv.2020.136709
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| 论文题名: | Sediments ratchet-down coral reef algal turf productivity |
| 作者: | Tebbett S.B.; Bellwood D.R.
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| 刊名: | Science of the Total Environment
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| ISSN: | 489697
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| 出版年: | 2020
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| 卷: | 713 | | 语种: | 英语
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| 英文关键词: | Algal turf
; Coral reef
; Ecosystem function
; Epilithic algal matrix
; Herbivory
; Productivity
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| Scopus关键词: | Algae
; Biomass
; Climate change
; Ecosystems
; Productivity
; Reefs
; Algal turfs
; Benthic productivity
; Community composition
; Coral reef
; Ecosystem functions
; Global climate changes
; Herbivory
; Potential productivity
; Sediments
; algal community
; Anthropocene
; Bayesian analysis
; benthic foraminifera
; coral reef
; ecosystem function
; herbivory
; numerical model
; seaweed
; algal community
; article
; Australia
; biomass
; coral reef
; detritus
; global climate
; herbivory
; human
; nutritional value
; productivity
; sediment
; Australia
; Coral Sea
; Great Barrier Reef
; Queensland
; algae
; Anthozoa
; Pisces
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| 英文摘要: | Coral reefs are highly productive ecosystems, with much of this productivity arising from the algal turfs which cover the hard reef substratum. This productivity can flow up the food chain through herbivorous fishes, to be harvested by humans as fishable biomass. However, algal turfs exist on a spectrum of forms from short productive algal turfs (SPATs), to long sediment-laden algal turfs (LSATs). The latter are increasingly likely to typify Anthropocene coral reefs, however, we have a limited understanding of their nature and potential productivity. We assessed the nature of algal turfs in terms of length, biomass, relative detritus content, and productivity across a sediment load gradient, from SPATs to LSATs, at two reefs separated by >450 km along Australia's Great Barrier Reef (GBR). Furthermore, to assess the capacity of sediments to shape productivity, we modelled algal turf productivity, as a function of sediment load, across multiple spatial scales in a Bayesian framework. We recorded precipitous declines in both the productivity of algal turfs, and the relative nutritional value of particulates, up to sediment loads of ~100 g m− 2. However, algal turf biomass did not change with sediment loads. This appears to reflect a shift in algal community composition from short, high-biomass, highly-productive algae at low sediment loads, to longer, low-biomass, less productive algae at high sediment loads. Importantly, these relationships provide a robust framework for estimating algal turf productivity on coral reefs. Indeed, when we applied our models to known sediment loads, we reveal that sediment loads alone can explain observed algal turf productivity gradients across multiple spatial scales. In an era of global climate change and coral reef reconfiguration, algal turf sediments may hold the key to maintaining benthic productivity on coral reefs in the Anthropocene. © 2020 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/158377
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| Appears in Collections: | 气候变化与战略
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作者单位: | ARC Centre of Excellence for Coral Reef Studies and College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia
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| Recommended Citation: | |
Tebbett S.B.,Bellwood D.R.. Sediments ratchet-down coral reef algal turf productivity[J]. Science of the Total Environment,2020-01-01,713
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