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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Is larval dispersal a necessity for decapod crabs from the Amazon mangroves? Response of Uca rapax zoeae to different salinities and comparison with sympatric species
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Is larval dispersal a necessity for decapod crabs from the Amazon mangroves? Response of Uca rapax zoeae to different salinities and comparison with sympatric species

机译：幼体散布是否需要亚马逊红树林中的十足纲蟹？番茄Uca rapeae对不同盐度的响应及与同胞物种的比较

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摘要

Salinity may play an important role in the larval Biology and Ecology of many brachyuran decapod crustaceans. Usually, ontogenetic changes in salinity tolerance represent a good indicator of larval dispersal in marine coastal ecosystems. In an experimental laboratory study, we investigated the effects of eight different salinities (Sal. 0-35) on zoeal development of the neotropical fiddler crab Uca rapax from a northern Brazilian estuary. In the study area the species reproduces year-round, including the wet season when low salinities (≤5) are frequent, resulting from heavy tropical rainfalls and input of freshwater mostly from the Amazon River. Larval survival and development duration from hatching to megalopa of U. rapax were significantly affected by salinity. All larvae died in Sal. 0-20, while they successfully developed through five zoeal stages to megalopa in higher salinities (Sal. 25-35). However, in Sal. 25 the survival rate was still significantly lower (33.8 ± 4.8%) and the zoeal development duration was longer (13.7 ± 0.5 days) than in salinities 30 and 35, where ＞90% of the larvae successfully survived after an average of 11.8-12.4 days of development, respectively. Our results strongly suggest that the early life-history stages of U. rapax perform ontogenetic migrations towards adjacent coastal or fully marine waters to develop in favourable high salinities. Comparison with two other sympatric crab species, e.g. Ucides cordatus and Uca vocator, suggests that the larval 'export' strategy is a convergent adaptation exhibited by decapod species in the Amazon region to avoid mass mortality within parental mangroves that are frequently subjected to strong salinity fluctuations caused by the specific meteorological and hydrological conditions.
机译：盐分可能在许多腕足类甲壳动物的幼虫生物学和生态学中起重要作用。通常，盐度耐受性的个体发生变化是海洋沿海生态系统中幼虫扩散的良好指示。在一项实验性实验室研究中，我们研究了八种不同盐度（盐度0-35）对巴西北部河口新热带提琴蟹Uca rapax的幼体发育的影响。在研究区域中，该物种全年繁殖，包括潮湿的季节，这时盐度低（≤5）频繁发生，这是由于热带雨水充沛和主要来自亚马逊河的淡水输入所致。盐度极大地影响了幼虫的存活和发育时间，从U rapax的孵化到半生不熟。所有幼虫都死于萨尔。 0至20岁，而他们成功通过五个阶段的阶段成功发育成高盐度的美加洛巴（Sal。25-35）。但是，在萨尔。 25比盐度30和35的存活率仍然要低得多（33.8±4.8％），动物的发展时间更长（13.7±0.5天），其中＞ 90％的幼虫在平均11.8-12.4之后成功存活发展的日子分别。我们的结果有力地表明，U。rapax的生命历史早期阶段会向邻近的沿海水域或完全海水中进行成因迁移，从而在有利的高盐度条件下发展。与其他两种同属蟹物种的比较，例如Ucides cordatus和Uca vocator认为，幼虫的“出口”策略是亚马逊地区十足动物展现出的一种趋同适应性，可以避免亲本红树林中的大量死亡，这些亲本红树林经常因特定的气象和水文条件而遭受强烈的盐度波动。

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    Darlan de Jesus de Brito Simith; Marcus Alexandra Borges Pires; Fernando Araujo Abrunhosa; Cristiana Ramalho Maciel; Karen Diele;

  • 作者单位

    Laboratorio de Carcinologia, Institute de Estudos Costeiros (IECOS), Universidade Federal do Para (UFPa), Campus Universitario de Braganca, Alameda Leandro Ribeiro s, Aldeia, 68600-000 Braganca, Para, Brazil,Laboratorio de Ecologia de Manguezal (LAMA), Institute de Estudos Costeiros (IECOS), Universidade Federal do Para (UFPa), Campus Universitario de Braganca, Alameda Leandro Ribeiro s. Aldeia, 68600-000 Braganca, Para, Brazil;

    Laboratorio de Carcinologia, Institute de Estudos Costeiros (IECOS), Universidade Federal do Para (UFPa), Campus Universitario de Braganca, Alameda Leandro Ribeiro s, Aldeia, 68600-000 Braganca, Para, Brazil;

    Laboratorio de Carcinologia, Institute de Estudos Costeiros (IECOS), Universidade Federal do Para (UFPa), Campus Universitario de Braganca, Alameda Leandro Ribeiro s, Aldeia, 68600-000 Braganca, Para, Brazil;

    Laboratdrio de Aquicultura, Institute de Estudos Costeiros (IECOS), Universidade Federal do Para (UFPa), Campus Universitario de Braganca, Alameda Leandro Ribeiro s, Aldeia, 68600-000 Braganca, Para, Brazil;

    Edinburgh Napier University, School of Life, Sport and Social Sciences, Edinburgh EH11 4BN, UK;

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  • 正文语种 eng
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  • 关键词

    Amazon estuaries; Fiddler crab; Larval development; Ontogenetic migration; Salinity tolerance; Survival; Ucides cordatus; Uca vocator;

    机译：亚马逊河口;小提琴蟹;幼虫发育;本体迁移;耐盐性;生存;杀害脐带;乌卡发声器;

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