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Título: Contributions of C3 and C4 plants to higher trophic levels in an Amazonian savana
Autor(es): Pedro Santos
Cristina Banks
Renato Cintra
Assunto: Amazônia
Aves Aquáticas
ISSN: 0029-8549
Revista: Oecologia
Volume: 30
Resumo: We studied the energy Øow from C3and C4plants to higher trophic levels in a central Amazoniansavanna by comparing the carbon stable-isotope ratiosof potential food plants to the isotope ratios of species ofdi erent consumer groups. All C4plants encountered inour study area were grasses and all C3plants werebushes, shrubs or vines. Di erences ind13C ratiosamong bushes ( x=)30.8, SD = 1.2), vines ( x=)30.7, SD = 0.46) and trees ( x=)29.7, SD = 1.5)were small. However the meand13C ratio of dicoty-ledonous plants ( x=)30.4, SD = 1.3) was much morenegative than that of the most common grasses( x=)13.4, SD = 0.27). The insect primary consumershadd13C ratios which ranged from a mean of)29.5(SD = 0.47) for the grasshopperTropidacris collaristoa mean of)14.7 (SD = 0.56) for a termite (Nasuti-termessp.), a range similar to that of the vegetation.However, the common insectivorous and omnivorousvertebrates had intermediate values ford13C, indicatingthat carbon from di erent autotrophic sources mixesrapidly as it moves up the food chain. Despite thismixing, the frogs and lizards generally had higher valuesofd13C( x=)21.7, SD = 1.6; x=)21.9, SD = 1.8,respectively) than the birds ( x=)24.8, SD = 1.8) andthe only species of mammal resident in the savanna( x=)25.4), indicating that they are generally moredependent on, or more able to utilise, food chains basedon C4grasses.
ISSN: 0029-8549
Local de publicação: Alemanha
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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