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首页> 外文期刊>Marine biology >Density-dependent effects control the reproductive strategy and population growth of Aurelia aurita s.l. scyphistomae
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Density-dependent effects control the reproductive strategy and population growth of Aurelia aurita s.l. scyphistomae

机译：依赖密度的效应控制着金黄色葡萄球菌的繁殖策略和种群增长。剑突

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摘要

Aurelia aurita s.l. scyphistomae are capable of developing different asexual modes for propagation and thus present a multi-mode reproductive strategy. The reproduction rates and the reproductive strategy they adopt depend on a combination of various environmental parameters. We investigated the A. aurita s.l. polyp-to-polyp reproduction strategy and population growth in relation to polyp density. Our results confirmed that density-dependent factors control population growth of A. aurita s.l. scyphistomae in three different ways: (1) decreasing the polyp reproduction rate, (2) triggering the production of motile bud-like tissue particles and (3) inducing the detachment of developed scyphistomae. Whereas the decrease in the reproduction rate reduces the number of recruits, the motile particles and the detachment of scyphistomae contribute to minimizing density-dependent effects by allowing reproductive products and scyphistomae to drift away. Thus, not only are the negative effects of intraspecific competition for space and food diminished but also the potential colonization of new substrates, and further increase in scyphistoma density is favoured on larger spatial scales. The potential capability to switch its polyp-to-polyp reproduction strategy in response to environmental clues and population density may give Aurelia high adaptability in the temperate coastal waters where they commonly live and where they may be exposed to wide-ranging and fluctuating environmental variables that affect their survival and longevity. Considering these features, as well as the wide tolerance of Aurelia scyphistomae (and medusae) to environmental parameters, it is not surprising that the species/lineages of Aurelia are cosmopolitan and exhibit the most frequent bloom events worldwide.
机译：Aurelia aurita s.l.鞘翅目昆虫能够发展出不同的无性繁殖模式，因此提出了一种多模式生殖策略。它们采用的繁殖率和繁殖策略取决于各种环境参数的组合。我们调查了A. aurita s.l.息肉到息肉的繁殖策略以及与息肉密度有关的种群增长。我们的结果证实，密度依赖性因子控制金黄色葡萄球菌的种群增长。鞘脂瘤有以下三种不同的方式：（1）降低息肉的繁殖率；（2）触发运动型芽状组织颗粒的产生；（3）诱导发育的鞘脂瘤的脱离。繁殖率的降低减少了新兵的数量，而运动型颗粒和鞘状茎瘤的分离则通过使生殖产物和鞘状茎瘤漂移而有助于最小化密度依赖性效应。因此，不仅减少了种内竞争对空间和食物的负面影响，而且减少了新底物的潜在定植，并且在更大的空间尺度上有利于进一步增加茎鞘吸虫密度。响应环境线索和种群密度而改变息肉到息肉繁殖策略的潜在能力可能使Aurelia在它们通常生活的温带沿海水域以及可能暴露于范围广泛且波动的环境变量中具有高度适应性影响他们的生存和长寿。考虑到这些特征，以及小球藻（Aurelia scyphistomae）（和美杜莎）对环境参数的广泛耐受性，毫不奇怪，Aurelia的物种/血统是世界性的，并且在世界范围内表现出最频繁的开花事件。

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  • 来源
    《Marine biology》 |2015年第8期|1665-1672|共8页
  • 作者

    Schiariti Agustin; Melica Valentina; Kogovsek Tjasa; Malej Alenka;

  • 作者单位

    Univ Nacl Mar Plata, Inst Invest Marinas & Costeras IIMyC, CONICET, Mar Del Plata, Argentina|Inst Nacl Invest & Desarrollo Pesquero INIDEP, Mar Del Plata, Buenos Aires, Argentina;

    Univ Trieste, Dept Life Sci, I-34100 Trieste, Italy;

    Hiroshima Univ, Grad Sch Biosphere Sci, Higashihiroshima 7398528, Japan|Natl Inst Biol, Marine Biol Stn Piran, Piran 6330, Slovenia;

    Natl Inst Biol, Marine Biol Stn Piran, Piran 6330, Slovenia;

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