globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0097738
论文题名:
Spatio-Temporal Variability of Copepod Abundance along the 20°S Monitoring Transect in the Northern Benguela Upwelling System from 2005 to 2011
作者: Maya Bode; Anja Kreiner; Anja K. van der Plas; Deon C. Louw; Richard Horaeb; Holger Auel; Wilhelm Hagen
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2014
发表日期: 2014-5-20
卷: 9, 期:5
语种: 英语
英文关键词: Copepods ; Zooplankton ; Chlorophyll ; Salinity ; Oxygen ; Spring ; Seasons ; Summer
英文摘要: Long-term data sets are essential to understand climate-induced variability in marine ecosystems. This study provides the first comprehensive analysis of longer-term temporal and spatial variations in zooplankton abundance and copepod community structure in the northern Benguela upwelling system from 2005 to 2011. Samples were collected from the upper 200 m along a transect at 20°S perpendicular to the coast of Namibia to 70 nm offshore. Based on seasonal and interannual trends in surface temperature and salinity, three distinct time periods were discernible with stronger upwelling in spring and extensive warm-water intrusions in late summer, thus, high temperature amplitudes, in the years 2005/06 and 2010/11, and less intensive upwelling followed by weaker warm-water intrusions from 2008/09 to 2009/10. Zooplankton abundance reflected these changes with higher numbers in 2005/06 and 2010/11. In contrast, zooplankton density was lower in 2008/09 and 2009/10, when temperature gradients from spring to late summer were less pronounced. Spatially, copepod abundance tended to be highest between 30 and 60 nautical miles off the coast, coinciding with the shelf break and continental slope. The dominant larger calanoid copepods were Calanoides carinatus, Metridia lucens and Nannocalanus minor. On all three scales studied, i.e. spatially from the coast to offshore waters as well as temporally, both seasonally and interannually, maximum zooplankton abundance was not coupled to the coldest temperature regime, and hence strongest upwelling intensity. Pronounced temperature amplitudes, and therefore strong gradients within a year, were apparently important and resulted in higher zooplankton abundance.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0097738&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/19317
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: BreMarE - Bremen Marine Ecology, Marine Zoology, University of Bremen, Bremen, Germany;National Marine Information and Research Centre (NatMIRC), Swakopmund, Namibia;National Marine Information and Research Centre (NatMIRC), Swakopmund, Namibia;National Marine Information and Research Centre (NatMIRC), Swakopmund, Namibia;National Marine Information and Research Centre (NatMIRC), Swakopmund, Namibia;BreMarE - Bremen Marine Ecology, Marine Zoology, University of Bremen, Bremen, Germany;BreMarE - Bremen Marine Ecology, Marine Zoology, University of Bremen, Bremen, Germany

Recommended Citation:
Maya Bode,Anja Kreiner,Anja K. van der Plas,et al. Spatio-Temporal Variability of Copepod Abundance along the 20°S Monitoring Transect in the Northern Benguela Upwelling System from 2005 to 2011[J]. PLOS ONE,2014-01-01,9(5)
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