globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14114
Scopus记录号: 2-s2.0-85044933610
论文题名:
Population collapse dynamics in Acropora downingi, an Arabian/Persian Gulf ecosystem-engineering coral, linked to rising temperature
作者: Riegl B.; Johnston M.; Purkis S.; Howells E.; Burt J.; Steiner S.C.C.; Sheppard C.R.C.; Bauman A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:6
起始页码: 2447
结束页码: 2462
语种: 英语
英文关键词: bleaching ; climate change ; coral ; disturbance ; population dynamics ; rising temperatures
Scopus关键词: bleaching ; climate change ; coral ; disturbance ; ecosystem engineering ; high temperature ; population dynamics ; water temperature ; Arabian Sea ; Indian Ocean ; Persian Gulf ; Acropora ; Anthozoa
英文摘要: As in the tropical Atlantic, Acropora populations in the southern Persian/Arabian Gulf plummeted within two decades after having been ecosystem engineers on most wave-exposed reefs since the Pleistocene. Since 1996/1998 live coral cover in the Gulf declined by over 90% in many areas, primarily due to bleaching and diseases caused by rising temperatures. In the formerly dominant table-coral species A. downingi, population dynamics corresponding to disturbance regimes was quantified in three transition matrices (lower disturbance pre-1996; moderate disturbance from 1998 to 2010 and 2013 to 2017, disturbed in 1996/1998, 2010/11/12, 2017). Increased disturbance frequency and severity caused progressive reduction in coral size, cover, and population fecundity. Small size-classes were bolstered more by partial colony mortality than sexual recruitment. Some large corals had a size refuge and resisted die-back but were also lost with increasing disturbance. Matrix and biophysical larval flow models suggested one metapopulation. Southern, Arabian, populations could be connected to northern, Iranian, populations but this connectivity was lost under assumptions of pelagic larval duration at rising temperatures shortened to a third. Then, the metapopulation disintegrated into isolated populations. Connectivity required to avoid extinctions increased exponentially with disturbance frequency and correlation of disturbances across the metapopulation. Populations became unsustainable at eight disturbances in 15 years, when even highest theoretical recruitment no longer compensated mortality. This lethal disturbance frequency was 3-fold that of the moderately disturbed monitoring period and 4-fold of the preceding low-disturbance period—suggesting ongoing shortening of the disturbance-free period. Observed population collapse and environmental changes in the Gulf suggest that A. downingi is heading toward at least functional extinction mainly due to increasingly frequent temperature-induced mortality events, clearly linked to climate change. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110398
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Marine and Environmental Sciences, Halmos College of Natural Sciences and Oceanography, Nova Southeastern University, Dania Beach, FL, United States; Department of Biology, Halmos College of Natural Sciences and Oceanography, Nova Southeastern University, Dania Beach, FL, United States; Department of Marine Geology and Geophysics, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Center for Genomics and Systems Biology, New York University at Abu Dhabi, Abu Dhabi, United Arab Emirates; Institute for Tropical Marine Ecology, Roseau, Dominica; School of Life Sciences, University of Warwick, Coventry, United Kingdom; Department of Biological Sciences, National University of Singapore, Singapore, Singapore

Recommended Citation:
Riegl B.,Johnston M.,Purkis S.,et al. Population collapse dynamics in Acropora downingi, an Arabian/Persian Gulf ecosystem-engineering coral, linked to rising temperature[J]. Global Change Biology,2018-01-01,24(6)
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