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Antarctic coastal microalgal primary production and photosynthesis

机译:南极沿海微藻的初级生产和光合作用

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摘要

Primary production in coastal Antarctica is primarily contributed from three sources: sea ice algae, phytoplankton, and microphytobenthos. Compared to other eastern Antarctic sites, the sea ice microalgal biomass at Casey Station, in spring 2005 was relatively low, 3.84 ± 1.67 to 21.6 ± 13.3 mg chl-a m~(-2) but productive, 103-163 mg C m~(-2) day~(-1). The photosynthetic parameters, F_v/F_m and rETR_(max), imply a community well-acclimated to the light climate of the benthic, water column, and sea ice habitats. Phytoplankton biomass was greatest in late spring (11.1 ± 0.920 μg chl-a 1~(-1)), which probably reflects input from the overlying sea ice. Lower biomass and depressed F_v/F_m values later in the season were probably due to nutrient limitation. Benthic microalgal biomass was consistently between 200 and 400 mg chl-a m~(-2) and production increased through into late summer (204 mg C m~(-2) day~(-1)). After the sea ice broke out, the marine environment supported a small phytoplankton biomass and a large benthic microalgal biomass. Compared with previous studies, F_v/F_m values were relatively low but there was no evidence of photoinhibition. When sea ice was present, primary production of benthic microalgae was either very low or there was a net draw down of oxygen. The benthic microalgal community made a larger contribution to total primary production than the phytoplankton or sea ice algae at water depth less than approximately 5 m.
机译:南极沿海地区的初级生产主要来自三个来源:海冰藻,浮游植物和微底栖鱼类。与其他南极东部站点相比,2005年春季,凯西站的海冰微藻生物量相对较低,为3.84±1.67至21.6±13.3 mg chl-a m〜(-2),但生产力较高,为103-163 mg C m〜 (-2)天〜(-1)。光合参数F_v / F_m和rETR_(max)意味着该群落对底栖生物,水柱和海冰栖息地的轻度气候非常适应。春季末期浮游植物的生物量最大(11.1±0.920μgchl-a 1〜(-1)),这可能反映了上覆海冰的输入。季节后期较低的生物量和较低的F_v / F_m值可能是由于营养限制。底栖微藻生物量始终在200至400 mg chl-a m〜(-2)之间,直到夏末(204 mg C m〜(-2)天〜(-1))的产量均增加。海冰爆发后,海洋环境支撑着少量的浮游植物生物量和大量的底栖微藻生物量。与以前的研究相比,F_v / F_m值相对较低,但是没有光抑制的证据。当存在海冰时,底栖微藻的初级产量很低,或者有净吸氧量。在水深小于约5 m时,底栖微藻群落对总初级生产的贡献大于浮游植物或海冰藻。

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  • 来源
    《Marine biology》 |2012年第12期|2827-2837|共11页
  • 作者单位

    Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 126, Hobart, TAS 7001, Australia;

    Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 126, Hobart, TAS 7001, Australia;

    Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 126, Hobart, TAS 7001, Australia,Department of BioSciences, University of Mauritius, Reduit, Mauritius;

    Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 126, Hobart, TAS 7001, Australia;

    Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 126, Hobart, TAS 7001, Australia,Center for Marine and Coastal Studies, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia;

    Plant Functional Biology and Climate Change Cluster (C3), University of Technology, Sydney, PO Box 123, Broadway, NSW 2007, Australia;

    School of Biological Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand;

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