DOI: 10.1111/gcb.12898
论文题名: Oxygen limitations on marine animal distributions and the collapse of epibenthic community structure during shoaling hypoxia
作者: Chu J.W.F. ; Tunnicliffe V.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 8 起始页码: 2989
结束页码: 3004
语种: 英语
英文关键词: Deoxygenation
; Epibenthos
; Habitat shrinkage
; Insitu oxygen limits
; Ocean hypoxia
; Ocean Networks Canada
; Oxygen loss
; Saanich Inlet
Scopus关键词: benthos
; carbon dioxide enrichment
; community structure
; ecological impact
; ecosystem response
; future prospect
; hypoxia
; oxygen
; sublethal effect
; Pacific Ocean
; Pacific Ocean (Northeast)
; Animalia
; Crustacea
; oxygen
; sea water
; animal
; animal dispersal
; aquatic species
; chemistry
; Pacific Ocean
; Animal Distribution
; Animals
; Aquatic Organisms
; Oxygen
; Pacific Ocean
; Seawater
英文摘要: Deoxygenation in the global ocean is predicted to induce ecosystem-wide changes. Analysis of multidecadal oxygen time-series projects the northeast Pacific to be a current and future hot spot of oxygen loss. However, the response of marine communities to deoxygenation is unresolved due to the lack of applicable data on component species. We repeated the same benthic transect (n=10, between 45 and 190m depths) over 8years in a seasonally hypoxic fjord using remotely operated vehicles equipped with oxygen sensors to establish the lower oxygen levels at which 26 common epibenthic species can occur in the wild. By timing our surveys to shoaling hypoxia events, we show that fish and crustacean populations persist even in severe hypoxia (<0.5mLL-1) with no mortality effects but that migration of mobile species occurs. Consequently, the immediate response to hypoxia expansion is the collapse of community structure; normally partitioned distributions of resident species coalesced and localized densities increased. After oxygen renewal and formation of steep oxygen gradients, former ranges re-established. High frequency data from the nearby VENUS subsea observatory show the average oxygen level at our site declined by 0.05mLL-1year-1 over the period of our study. The increased annual duration of the hypoxic (<1.4mLL-1) and severely hypoxic periods appears to reflect the oxygen dynamics demonstrated in offshore source waters and the adjacent Strait of Georgia. Should the current trajectory of oxygen loss continue, community homogenization and reduced suitable habitat may become the dominant state of epibenthic systems in the northeast Pacific. In situ oxygen occurrences were not congruent with lethal and sublethal hypoxia thresholds calculated across the literature for major taxonomic groups indicating that research biases toward laboratory studies on Atlantic species are not globally applicable. Region-specific hypoxia thresholds are necessary to predict future impacts of deoxygenation on marine biodiversity. © 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/61739
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, University of Victoria, PO Box 3080, Victoria, BC, Canada; School of Earth and Ocean Sciences, University of Victoria, PO Box 3080, Victoria, BC, Canada
Recommended Citation:
Chu J.W.F.,Tunnicliffe V.. Oxygen limitations on marine animal distributions and the collapse of epibenthic community structure during shoaling hypoxia[J]. Global Change Biology,2015-01-01,21(8)