caa a22 4500 46909687X CHVBK 20180323133033.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00317409 doi (NATIONALLICENCE)springer-10.1007/BF00317409 Energy sources for aquatic animals in the Orinoco River floodplain: evidence from stable isotopes [Elektronische Daten] [S. Hamilton, W. Lewis Jr., S. Sippel] Summary: Stable carbon and nitrogen isotope ratios in autotrophs, aquatic invertebrates and fishes from the Orinoco River floodplain of Venezuela reveal that microalgae, including both phytoplankton and epiphytic (attached) forms, are predominant energy sources for many aquatic animals, even though aquatic vascular plants are much more abundant. Floating mats of the grass Paspalum repens and the water hyacinth Eichhornia spp. harbor particularly high densities of aquatic animals, but isotopic evidence indicates that few species are dependent on organic carbon originating from these plants. The stable isotopic evidence for the trophic importance of algae contradicts traditional interpretations of food webs in freshwater wetlands, which are generally thought to be based largely on detritus originating from vascular plants. Springer-Verlag, 1992 Orinoco River nationallicence Floodplain nationallicence Stable isotopes nationallicence Food webs nationallicence Algae nationallicence Hamilton S. Center for Limnology, Department of Environmental, Population, and Organismic Biology, University of Colorado, Campus Box 334, 80309, Boulder, CO, USA aut Lewis Jr. W. Center for Limnology, Department of Environmental, Population, and Organismic Biology, University of Colorado, Campus Box 334, 80309, Boulder, CO, USA aut Sippel S. Center for Limnology, Department of Environmental, Population, and Organismic Biology, University of Colorado, Campus Box 334, 80309, Boulder, CO, USA aut Oecologia Springer-Verlag 89/3(1992-03-01), 324-330 0029-8549 89:3<324 1992 89 442 https://doi.org/10.1007/BF00317409 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317409 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hamilton S. Center for Limnology, Department of Environmental, Population, and Organismic Biology, University of Colorado, Campus Box 334, 80309, Boulder, CO, USA aut NATIONALLICENCE 700 1- Lewis Jr W. Center for Limnology, Department of Environmental, Population, and Organismic Biology, University of Colorado, Campus Box 334, 80309, Boulder, CO, USA aut NATIONALLICENCE 700 1- Sippel S. Center for Limnology, Department of Environmental, Population, and Organismic Biology, University of Colorado, Campus Box 334, 80309, Boulder, CO, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 89/3(1992-03-01), 324-330 0029-8549 89:3<324 1992 89 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer