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首页> 外文期刊>Estuarine Coastal and Shelf Science >Laboratory trials reveal that exposure to extreme raining events prior to metamorphosis affect the post-settlement performance of an estuarine crab
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Laboratory trials reveal that exposure to extreme raining events prior to metamorphosis affect the post-settlement performance of an estuarine crab

机译：实验室试验表明，在变态之前暴露于极端降雨事件会影响河口蟹的沉降后性能

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摘要

Meteorological forcing can impact planktonic communities, with extreme raining events promoting salinity decreases and triggering larval mortality in estuarine plankton. The present study evaluated how exposure to low salinities prior to metamorphosis of Carcinus maenas megalopae (last larval stage) may affect its ability to metamorphose and the post-metamorphosis performance of juvenile crabs. An extreme raining event that promoted a generalized decrease in salinity (from 25 to 10) in the whole water column of one of the main channels of a coastal lagoon was mimicked in the laboratory. Wild megalopae of C. maenas were collected and kept individually without any food at salinities of 10 or 25 (S10 or S25) until they either died or metamorphosed to the first crab instar (C1). Specimens metamorphosing in 5 days or less following their collection were labeled as early settlers (ES10 and ES25), while those taking more than 5 days were labeled as late settlers (LS10 and LS25). All newly metamorphosed crabs were kept individually until C5 at a salinity of 25 and fed ad libitum, with their intermolt periods and carapace width (CW) being recorded. Osmotic stress did not affect the survival or ability to metamorphose of C. maenas megalopae, with 89% of all larvae in both salinities being able to metamorphose. This result is supported by the ability of this larval stage to hyper-regulate. Nonetheless, an exposure of late settling megalopae to low salinities prior to metamorphosis promotes the occurrence of juvenile crabs with a smaller CW. The deleterious effects of exposing late settling megalopae to low salinities appears to be magnified during early benthic life, with C5 originating from treatment LS10 displaying a significantly smaller CW (4.87 +/- 0.28 mm) and lower wet weight (WW) (28.95 +/- 4.62 mg). On the other side, C5 originating from ES25 exhibited a significantly higher CW (5.90 +/- 0.33 mm) and WW (50.89 +/- 8.14 mg). The nutritional vulnerability experienced by megalopae starved for longer periods (late settlers) may have been magnified for specimens exposed to a lower salinity, with the energetic costs associated with hyper-regulation negatively affecting the growth performance of juvenile crabs. Osmotic stress experienced by late settling megalopae can shape adult populations of C. maenas by promoting the occurrence of smaller juveniles, thus more vulnerable to predation and cannibalism. Phenotypic links must be incorporated in the study of marine invertebrates, namely when life stages are vulnerable to metereological forcing (e.g., extreme rainfall) at critical periods of their life-cycle (e.g., metamorphosis). (C) 2015 Elsevier Ltd. All rights reserved.
机译：气象强迫会影响浮游生物群落，极端降雨事件促使盐度降低并触发河口浮游生物的幼虫死亡率。本研究评估了巨蟹（Macins maenas megalopae）（最后的幼体阶段）变态之前暴露于低盐度可能如何影响其变态能力和幼蟹的变态后性能。在实验室中模拟了一个极端降雨事件，该事件促使沿海泻湖的一条主要通道的整个水柱中的盐度普遍降低（从25降至10）。收集了野生的美人梭菌（C. maenas），不加任何食物单独保存在盐度为10或25（S10或S25）下，直到它们死亡或变态为第一龄蟹（C1）。收集后5天或更短时间内变形的标本被标记为早期定居者（ES10和ES25），而耗时超过5天的标本被标记为晚期定居者（LS10和LS25）。将所有新变态的螃蟹单独饲养直至盐度为25的C5并随意喂养，并记录它们的蜕皮期和甲壳宽度（CW）。渗透胁迫不影响美氏梭状芽胞杆菌的存活或变质能力，两种盐度中所有幼虫的89％都能够变质。幼虫阶段过度调节的能力支持了这一结果。尽管如此，在变态之前将晚期定居的巨足类暴露于低盐度会促进CW较小的幼蟹的发生。在底栖生物的早期生活中，使晚期沉降的巨兽暴露于低盐度的有害作用似乎被放大了，源自处理LS10的C5显示出显着较小的CW（4.87 +/- 0.28 mm）和较低的湿重（WW）（28.95 + / -4.62毫克）。另一方面，源自ES25的C5表现出更高的CW（5.90 +/- 0.33 mm）和WW（50.89 +/- 8.14 mg）。盐度较低的标本可能会因长期处于饥饿状态（定居者）而遭受饥饿而遭受的营养脆弱性被放大，与过度调节相关的精力成本会对幼蟹的生长性能产生负面影响。迁徙到后期的巨鳄所经历的渗透胁迫可通过促进较小幼体的发生而塑造成毛状念珠菌的成年种群，因此更易于被捕食和食人。表型联系必须纳入海洋无脊椎动物研究中，即当生命阶段在生命周期的关键时期（例如变态）易受计量学强迫（例如极端降雨）的影响时。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2015年第5期|179-183|共5页
  • 作者

    Rey Felisa; Silva Neto Gina M.; Rosa Rui; Queiroga Henrique; Calado Ricardo;

  • 作者单位

    Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal|Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal|Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal;

    Univ Lisbon, Fac Ciencias, Lab Maritimo Guia, MARE Marine & Environm Sci Ctr, P-2750374 Cascais, Portugal;

    Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal|Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal|Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carcinus maenas; growth; osmotic stress; phenotypic links;

    机译：梅氏肉;生长;渗透压;表型联系;

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