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首页> 外文期刊>Estuarine Coastal and Shelf Science >Temporal variability (1997-2015) of trophic fish guilds and its relationships with El Nino events in a subtropical estuary
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Temporal variability (1997-2015) of trophic fish guilds and its relationships with El Nino events in a subtropical estuary

机译：亚热带河口营养鱼类协会的时间变异（1997-2015）及其与厄尔尼诺现象的关系

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Global climatic phenomena like El Nino events are known to alter hydrological cycles and local abiotic conditions leading to changes in structure and dynamics of terrestrial and aquatic biological communities worldwide. Based on a long-term (19 years) standardized sampling of shallow water estuarine fishes, this study investigated the temporal variability in composition and dominance patterns of trophic guilds in a subtropical estuary (Patos Lagoon estuary, Southern Brazil) and their relationship with local and regional driving forces associated with moderate (2002-2003 and 2009-2010) and very strong (1997-1998 and 2015-2016) El Nino events. Fish species were classified into eight trophic guilds (DTV detritivore, HVP herbivore-phytoplankton, HVM macroalgae herbivore, ISV insectivore, OMN omnivore, PSV piscivore, ZBV zoobenthivore and ZPL zooplanktivore) and their abundances were correlated with environmental factors. Canonical correspondence analysis revealed that less dominant (those comprising 10% of total abundance) trophic guilds, such as HVP, HVM, ISV, PSV, increased their relative abundance in the estuary during higher rainfall and lower salinity conditions associated with moderate and very strong El Nino events. An opposite pattern was observed for the dominant trophic fish guilds like OMN and, at lesser extent, DTV and ZPL, which had greater association with higher values of salinity and water transparency occurring mostly during non-El Nino conditions. In contrast, ZBV's abundance was not correlated with contrasting environmental conditions, but rather, had higher association with samples characterized by intermediate environmental values. Overall, these findings show that moderate and very strong El Nino events did not substantially disrupt the dominance patterns among trophic fish guilds in the estuary. Rather, they increased trophic estuarine diversity by flushing freshwater fishes with distinct feeding habits into the estuary. (C) 2018 Elsevier Ltd. All rights reserved.
机译：众所周知，像厄尔尼诺现象这样的全球气候现象会改变水文循环和当地的非生物条件，从而导致全球陆地和水生生物群落的结构和动态发生变化。在长期（19年）标准化的浅水河口鱼类抽样基础上，本研究调查了亚热带河口（巴西南部帕托斯泻湖河口）营养协会的组成和优势模式随时间的变化及其与当地和地方的关系。与中等（2002-2003和2009-2010）和非常强劲（1997-1998和2015-2016）的厄尔尼诺事件相关的区域驱动力。鱼类种类分为8个营养协会（DTV鱼类，HVP草食性浮游植物，HVM大型藻类食草动物，ISV食虫动物，OMN杂食动物，PSV食草动物，ZBV食虫动物和ZPL浮游动物），其丰度与环境因素相关。典型的对应分析表明，在较高的降雨和较低的盐度条件下，中等至非常强的条件下，诸如HVP，HVM，ISV，PSV之类的优势营养协会（占总丰度的<10％）会增加其相对丰度。厄尔尼诺事件。对于主要的营养鱼类行会（如OMN）和较小的DTV和ZPL，则观察到相反的模式，它们与较高的盐度和水透明度值（主要在非厄尔尼诺现象）期间发生的关联更大。相反，ZBV的丰度与相反的环境条件无关，而与具有中等环境值特征的样品具有更高的关联性。总体而言，这些发现表明，温和且非常强烈的厄尔尼诺现象并没有实质性地破坏河口营养鱼类行会的主导模式。相反，它们通过将具有不同摄食习惯的淡水鱼冲入河口来增加营养河口的多样性。 （C）2018 Elsevier Ltd.保留所有权利。

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