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首页> 外文期刊>Marine biology >The abundance and life histories of terrestrial isopods in a salt marsh of the Ria Formosa lagoon system, southern Portugal
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The abundance and life histories of terrestrial isopods in a salt marsh of the Ria Formosa lagoon system, southern Portugal

机译：葡萄牙南部Ria Formosa泻湖系统盐沼中陆地等足类动物的丰富度和生活史

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摘要

Four species of isopod characteristic of salt marsh habitats, Tylos ponticus, Porcellio lamellatus, Halophiloscia couchii and Armadillidium album coexist in the upper reaches of the Ria Formosa lagoon salt marsh system in southern Portugal. In this locality, T. ponticus is the most abundant of the four species with mean annual densities of 2,950 m~(-2) and a peak density of 10,387 m~(-2) in July 1998 which is very much higher than what has previously been recorded for any isopod in any habitat. The mean annual densities for the other species were lower: P. lamellatus 36 m~(-2), A. album 19 m~(-2) and H. couchii 3 m~(-2), indicating a less significant role in this ecosystem. Tylos ponticus and A. album started to breed on May, 24 and 12 months after release from the mar-supium, respectively, where as other species start to breed in March, 12 months after their release from the marsupium. Tylos ponticus has a relative growth rate (RGR) of 0.23 between release from the marsupium and time of first breeding in July of its second year and breeds at a mature mass of 3.6 mg AFDM whereas the other three species mature after 10-12 months, have more than double this RGR but because of the shorter pre-reproductive period breed at masses of 1.8 mg AFDM for P. lamellatus, 1.0 mg AFDM for H. couchii, and 1.1 mg AFDM for A. album, respectively. The mass specific fecundity of all three of the less abundant species was higher than that of T. ponticus but the offspring of T. ponticus were ten times heavier than those of the next largest species, P. lammellatus. The difference in abundances between the species is interpreted as being due to the larger mass of the offspring of the most successful species. This larger mass confers an adaptive advantage due to larger size being associated with reduced juvenile mortality for isopods under abiotically stressful conditions.
机译：葡萄牙南部的Ria Formosa泻湖盐沼系统的上游共存有四种具有盐沼生境特征的等足类动物，即Tylos ponticus，Porcellio lamellatus，Halophiloscia couchii和Armadillidium Album。在该地区，桥本T. ponticus是这四个物种中最丰富的，其年平均密度为2,950 m〜（-2），1998年7月的峰值密度为10,387 m〜（-2），远高于目前的密度。以前已记录过任何栖息地中的任何等足动物。其他物种的年平均密度较低：薄层疟原虫36 m〜（-2），白曲霉19 m〜（-2）和长沙发H3 m〜（-2），表明在该物种中的作用较小。这个生态系统。 Tylos ponticus和A.专辑分别从mar-supium释放后的5月，24和12个月开始繁殖，而其他物种则从marsupium释放12个月后的3月开始繁殖。在从有袋动物释放到第二年7月首次繁殖之间，Tylos ponticus的相对生长速率（RGR）为0.23，繁殖时的成熟质量为3.6 mg AFDM，而其他三个物种在10-12个月后成熟， RGR的两倍以上，但是由于繁殖前期的繁殖时间较短，分别对lamellatus的质量为1.8 mg AFDM，H。benchii的质量为1.0 mg AFDM，A。album的质量为1.1 mg AFDM。这三个数量较少的物种的质量比繁殖力都高于桥本鼠，但其后代的重量比第二大种羊驼（P. lammellatus）重十倍。物种之间的丰度差异被解释为是由于最成功物种的后代质量较大。由于较大的体积与在非生物胁迫条件下等足动物的幼虫死亡率降低有关，因此较大的质量具有适应性优势。

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  • 来源
    《Marine biology》 |2005年第6期|p.1343-1352|共10页
  • 作者

    N. Dias; M. Sprung; M. Hassall;

  • 作者单位

    Faculdade de Ciencias do Mar e do Ambiente, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal;

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  • 正文语种 eng
  • 中图分类 环境生物学;
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