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首页> 外文期刊>Marine biology >Intra- and interannual variability in the larval fish assemblage off Gran Canaria (Canary Islands) over 2005-2007
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Intra- and interannual variability in the larval fish assemblage off Gran Canaria (Canary Islands) over 2005-2007

机译：2005-2007年大加那利岛（加那利群岛）外幼体鱼群的年内和年际变化

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摘要

The present study provides the longest and most intensive plankton and larval fish seasonal variability analysis in the Canary Islands and forms a basis for understanding life cycle scheduling and interactions among species, as well as the potential variability in transport processes of early life stages. Larval fish assemblages were studied weekly at Gran Canaria Island, Canary Islands, from January 2005 to June 2007, which represented two contrasting hydrological and biological periods. The former year was characterized by lower temperature and salinity that increased through 2006 and 2007. In contrast, chlorophyll concentration and mesozooplankton biomass decreased through the same period, especially when only the late winter bloom period was evaluated. However, ich-thyoplankton abundance did not exhibit any clear pattern, as larger values were observed during 2006. The larval fish community of this oceanic island, located near the NW African upwelling, was composed of both neritic and oceanic taxa. Two families accounted for almost half of the collected larvae: Clupeidae (21.9%) and Myctophidae (20.5%). Although total larval concentration did not exhibit any seasonal peak linked to changes in zooplankton, the ichthyoplankton composition gradually changed during the year due to the high diversity and extended spawning periods of the fish species represented in samples. "Winter" and "summer" larval assemblages were identified, corresponding to the mixing and stratification periods of the water column, respectively. These assemblages were characterized by changes in the contribution of the most abundant annual taxa (Sardinella aurita, Cyclothone braueri, Ceratoscope-lus spp. and Gobids) and by the presence of larvae of winter (Pagellus bogaraveo, Pomacentridae spl) or summer spaw-ners (Pomacentridae sp2, Trachinus draco, Arnoglossus thori, Tetraodontidae spl). Upwelling filaments shed from the NW African coast reached the sampling area three times during this study, but changes in the local larval community were only detected in August 2005.
机译：本研究提供了加那利群岛上最长，最密集的浮游生物和幼体鱼季节变异性分析，并为了解生命周期调度和物种间相互作用以及生命早期阶段运输过程中的潜在变异性奠定了基础。从2005年1月到2007年6月，每周在加那利群岛的大加那利岛上研究幼体鱼的组合，这是两个相反的水文和生物时期。前一年的特点是温度和盐度降低，直到2006年和2007年都增加了。相反，叶绿素浓度和中生浮游生物的生物量在同一时期下降了，特别是仅评估了冬末开花期时。但是，鱼类-浮游鱼类的丰度没有显示出任何清晰的模式，因为在2006年期间观察到较大的值。这个大洋岛屿的幼鱼群落位于西北非洲大陆上升流附近，由中性和海洋类群组成。有两个科几乎占了收集到的幼虫的一半：C科（21.9％）和Myctophidae（20.5％）。尽管幼体总浓度没有显示出与浮游动物变化相关的任何季节性峰值，但是由于样本中所代表鱼类的高度多样性和产卵期延长，鱼浮游动物的组成在这一年内逐渐变化。确定了“冬季”和“夏季”幼虫组合，分别对应于水柱的混合和分层时间。这些组合的特征是最丰富的一年生类群（极度沙丁鱼，Cyclothone braueri，Ceratoscope-lus spp。和Gobids）的贡献以及冬季幼虫（Pagellus bogaraveo，Pomacentridae spl）或夏季成虫的存在变化（Pomacentridae sp2，Trachus德拉科，thoro arnoglossus，Tetraodontidae spl）。在这项研究中，从西北非洲海岸喷出的上升流细丝已三次到达采样区，但是直到2005年8月才检测到当地幼虫群落的变化。

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  • 来源
    《Marine biology》 |2011年第2期|p.257-273|共17页
  • 作者

    M. Moyano; S. Hernandez-Leon;

  • 作者单位

    Laboratorio de Oceanografia Biologica,Facultad de Ciencias del Mar. Universidad de Las Palmas de G.C, Campus Universitario de Tafira,35017 Las Palmas de Gran Canaria, Canary Islands, Spain;

    Laboratorio de Oceanografia Biologica,Facultad de Ciencias del Mar. Universidad de Las Palmas de G.C, Campus Universitario de Tafira,35017 Las Palmas de Gran Canaria, Canary Islands, Spain;

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