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Demography and interannual variability of salp swarms (Thalia democratica)

机译:蜂群的人口统计学和年际变化(塔利亚民主共和国)

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摘要

Swarms of the pelagic tunicate, Thalia democratica, form during spring, but the causes of the large interannual variability in the magnitude of salp swarms are unclear. Changes in asexual reproduction (buds per chain) of T, democratica populations in the coastal waters of south-east Australia (32-35°S) were observed in three austral springs (October 2008-2010). T. democratica abundance was significantly higher in 2008 (1,312 individuals m~(-3)) than 2009 and 2010 (210 and 92 individuals m~(-3), respectively). There was a significant negative relationship (linear regression, r~2 = 0.61, F~(1.22) = 33.83, P < 0.001) between abundance and asexual reproduction. Similarly, relative growth rates declined with decreasing abundance. Generalised additive mixed modelling showed that T. democratica abundance was significantly positively related to preferred food >2 μm in size (P < 0.05) and negatively related to the proportion of non-salp zooplankton (P < 0.001). Salp swarm magnitude, growth, and asexual reproduction may depend on the abundance of larger phy-toplankton (prymnesiophytes and diatoms) and competition with other zooplankton.
机译:春季时会形成中上被膜的群体,塔利亚·民主大区,但尚不清楚蜂群数量年际差异较大的原因。在三个南方泉源(2008年10月至2010年10月),观察到澳大利亚东南沿海(32-35°S)的T,民主种群的无性繁殖(每链预算)变化。 2008年的民主三角藻丰度(1,312个体m〜(-3))明显高于2009年和2010年(分别为210和92个体m〜(-3))。丰度与无性生殖之间存在显着的负相关关系(线性回归,r〜2 = 0.61,F〜(1.22)= 33.83,P <0.001)。同样,相对增长率随着丰度的下降而下降。广义加性混合模型表明,粉虱的丰度与大于2μm的优选食物呈显着正相关(P <0.05),与非浮游性浮游动物的比例呈负相关(P <0.001)。蜂群的数量,生长和无性繁殖可能取决于较大的浮游植物(浮游植物和硅藻)的丰度以及与其他浮游动物的竞争。

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  • 来源
    《Marine biology》 |2014年第1期|149-163|共15页
  • 作者单位

    Evolution and Ecology Research Centre, University of New South Wales, Sydney, NSW 2052, Australia,Sydney Institute of Marine Science, Building 22, Chowder Bay Road, Mosman, NSW 2088, Australia;

    Evolution and Ecology Research Centre, University of New South Wales, Sydney, NSW 2052, Australia,Sydney Institute of Marine Science, Building 22, Chowder Bay Road, Mosman, NSW 2088, Australia,Plant Functional Biology and Climate Change Cluster, Faculty of Science, University of Technology Sydney, PO Box 123,Broadway, NSW 2007, Australia;

    Sydney Institute of Marine Science, Building 22, Chowder Bay Road, Mosman, NSW 2088, Australia,Plant Functional Biology and Climate Change Cluster, Faculty of Science, University of Technology Sydney, PO Box 123,Broadway, NSW 2007, Australia;

    Australian Rivers Institute, Coast and Estuaries, Griffith University, Gold Coast Campus, Gold Coast, QLD 4222,Australia;

    Climate Adaptation Flagship, CSIRO Marine and Atmospheric Research, Ecosciences Precinct, GPO Box 2583, Brisbane,QLD 4102, Australia,Centre for Applications in Natural Resource Mathematics (CARM), School of Mathematics and Physics, The University of Queensland, St. Lucia, QLD 4072, Australia;

    Evolution and Ecology Research Centre, University of New South Wales, Sydney, NSW 2052, Australia,Sydney Institute of Marine Science, Building 22, Chowder Bay Road, Mosman, NSW 2088, Australia;

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