Pierre Marle, Laurent Simon, Amandine Rigal, Chloé Guicharnaud, Paul Gauthier, Noéline Garcia, Emmanuel Castella, Hélène Mayor, Vera I. Slaveykova, Jean-Michel Olivier
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引用次数: 0
摘要
在大型河流洪泛区,由于季节环境变化和生境多样性,鱼类动物群的营养资源的可得性是高度可变的。“年鱼”必须找到合适的栖息地定居、觅食和生存。然而,关于幼鱼在其第一个生长季节的食物偏好的深入研究很少。本文研究了三种多面手鱼类Alburnus Alburnus (Linnaeus, 1758)、Squalius cephalus (Linnaeus, 1758)和Pseudorasbora parva (Temminck &Schlegel, 1846)从法国上Rhône河的四个泛滥平原遗址。更具体地说,我们研究了它们的时空变化与五个环境变量的关系:水文、溶解氧、初级产量、水温和电导率。稳定的水流条件和相关的温度和电导率对河漫滩河道中的浮游植物群落具有很强的结构作用,而河道内的水流运动和溶解氧浓度与浮游动物的组成有显著的相关性。当浮游动物密度大于≈100 ind L−1时,这三种鱼类可以开始主要以浮游动物为基础的YOY饮食。当浮游动物密度不足时,这三个物种都以浮游植物作为主要食物来源。最后,不同物种之间的饮食重叠,不同地点之间的差异很大。这项研究强调了研究洪泛区幼鱼的饮食和环境变量的必要性。
Flow and plankton availability control young-of-the-year fish diet in two floodplain nurseries
In large river floodplains, the availability of trophic resources to the fish fauna is highly variable as a consequence of seasonal environmental change and habitat diversity. Young-of-the-year fishes (YOY) must find suitable habitats to settle, feed and survive. However, very few in-depth studies are available about the food preferences of the young fishes during their first growing season. Here, we investigated the composition of planktonic assemblages and the YOY diet of three generalist fish species Alburnus alburnus (Linnaeus, 1758), Squalius cephalus (Linnaeus, 1758) and Pseudorasbora parva (Temminck & Schlegel, 1846) from four floodplain sites of the French Upper Rhône River. More specifically, we studied their temporal and spatial variations in relation to five environmental variables: hydrology, dissolved oxygen, primary production, water temperature and conductivity. Stable flow conditions and the associated temperature and conductivity strongly structured the phytoplankton community in the floodplain channels, whereas water movements within channels and dissolved oxygen concentrations were significantly correlated to the zooplankton composition. A zooplankton density above ≈100 ind L−1 allowed the initiation of a YOY diet mainly based upon zooplankton for the three fish species. When zooplankton densities were insufficient, all three species used phytoplankton as their main food resource. Finally, the diet overlaps between species, differed significantly between sites. The study highlights the need to examine the diet of juvenile fishes and environmental variables in the floodplains.
期刊介绍:
Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.