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首页> 外文期刊>Marine ecology >Environmental effects on the reproduction and fecundity of the introduced calcareous sponge Paraleucilla magna in Rio de Janeiro, Brazil
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Environmental effects on the reproduction and fecundity of the introduced calcareous sponge Paraleucilla magna in Rio de Janeiro, Brazil

机译：环境对巴西里约热内卢引入的钙质海绵Paraleucilla magna繁殖和繁殖力的影响

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摘要

The calcareous sponge Paraleucilla magna (Porifera, Calcarea) has been the subject of several studies in the last decade. It was first described along the Brazilian coast, where it is considered cryptogenic, and was subsequently found in the Mediterranean, where it is considered invasive. The wide artificial distribution of this species allows us to compare different aspects of the biology of an introduced species in different locations. Here, we analysed the effects of selected environmental parameters on the reproductive dynamics of P. magna in Rio de Janeiro (Brazil) over 18 months and compared our results with those obtained for the same species in the Mediterranean Sea. Specimens were collected monthly and analysed through histological methods. The density of reproductive elements in each month was calculated, and the effects of environmental parameters (photoperiod, precipitation, temperature, phytoplankton and bacterioplankton) were analysed using a regression tree analysis. Paraleucilla magna was reproductive throughout the study period. The densities of the reproductive elements (oocytes, embryos and larvae) showed no seasonality, and this species presented one of the highest reproductive efforts documented to date in the phylum Porifera (99.0 oocytes . mm(-3); 89.0 embryos . mm(-3); 319.0 larvae . mm(-3)). The main environmental parameters related to the reproduction of P. magna were temperature, photoperiod and bacterioplankton. Temperature was the main driver associated with the densities of oocytes and embryos, while bacterioplankton was the main driver of larvae (positive relationships). In Rio de Janeiro, larvae were present and continuously released. This strategy is different from that observed in the Mediterranean, where a larger larval output was observed but only during the summer months. Our results show that P. magna is a species with a strong invasive potential, considering its high and continuous reproductive effort. This high fecundity stimulated by high temperatures may be a key factor contributing to the growth of P. magna populations and its invasion of new areas.
机译：在过去的十年中，钙质海绵Paraleucilla magna（Porifera，Calcarea）成为了几项研究的主题。它首先在巴西海岸被描述为隐源性，随后在地中海被发现为入侵性。该物种的广泛人工分布使我们能够比较不同位置的引进物种生物学的不同方面。在这里，我们分析了选定的环境参数对巴西里约热内卢的南美白对虾繁殖动力学的影响，历时18个月，并将我们的结果与在地中海相同物种的研究结果进行了比较。每月收集标本，并通过组织学方法进行分析。计算每个月的生殖元素密度，并使用回归树分析法分析环境参数（光周期，降水，温度，浮游植物和浮游细菌）的影响。在整个研究过程中，大副白菜都是生殖的。生殖元件（卵母细胞，胚胎和幼虫）的密度没有季节性变化，该物种是迄今为止有史以来记载的最高的繁殖力之一（99.0卵母细胞。mm（-3）； 89.0胚。mm（-） 3）； 319.0幼虫。mm（-3））。与大假单胞菌繁殖有关的主要环境参数是温度，光周期和浮游细菌。温度是与卵母细胞和胚胎密度相关的主要驱动力，而浮游细菌是幼虫（正相关）的主要驱动力。在里约热内卢，幼虫存在并不断释放。这种策略与地中海地区观察到的策略不同，地中海地区观察到较大的幼体产量，但仅在夏季月份。我们的结果表明，考虑到P. magna的高强度和持续繁殖力，它是一种具有强大入侵潜力的物种。高温激发的这种高繁殖力可能是导致大假单胞菌种群增长及其对新地区入侵的关键因素。

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  • 来源
    《Marine ecology》 |2015年第4期|1075-1087|共13页
  • 作者

    Lanna Emilio; Paranhos Rodolfo; Paiva Paulo C.; Klautau Michelle;

  • 作者单位

    Univ Fed Bahia, Inst Biol, Dept Biol Geral, Salvador, BA, Brazil|Univ Fed Rio de Janeiro, Inst Biol, Dept Zool, BR-21941902 Rio De Janeiro, Brazil;

    Univ Fed Rio de Janeiro, Inst Biol, Dept Biol Marinha, BR-21941902 Rio De Janeiro, Brazil;

    Univ Fed Rio de Janeiro, Inst Biol, Dept Zool, BR-21941902 Rio De Janeiro, Brazil;

    Univ Fed Rio de Janeiro, Inst Biol, Dept Zool, BR-21941902 Rio De Janeiro, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Calcarea; life history evolution; population biology; Porifera; temperature;

    机译：钙;生活史演变;种群生物学;Porifera;温度;

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