Abstract:
: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.
journal_name
Oecologiajournal_title
Oecologiaauthors
Hamilton SK,Lewis WM Jr,Sippel SJdoi
10.1007/BF00317409subject
Has Abstractpub_date
1992-03-01 00:00:00pages
324-330issue
3eissn
0029-8549issn
1432-1939pii
10.1007/BF00317409journal_volume
89pub_type
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