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Título: Contribution of C3 and C4 plants to higher throphic levels in an amazonian savanna
Autor(es): William Ernest Magnusson
Maria Carmozina Araújo
Renato Cintra
Albertina Pimentel Lima
Luiz Martinelli
Heraldo Vasconcelos
Reinaldo L Victoria
Tânia Margarete Sanaiotti
Assunto: fonte energia
ISSN: 0029-8549
Revista: Oecologia
Volume: 119
Resumo: We studied the energy flow from C3 and C4 plants to higher trophic levels in a central Amazonian savanna by comparing the carbon stable-isotope ratios of potential food plants to the isotope ratios of species of different consumer groups. All C4 plants encountered in our study area were grasses and all C3 plants were bushes, shrubs or vines. Differences in δ13C ratios among 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 mean δ13C ratio of dicotyledonous plants (x¯ = −30.4, SD = 1.3) was much more negative than that of the most common grasses (x¯ = −13.4, SD = 0.27). The insect primary consumers had δ13C ratios which ranged from a mean of −29.5 (SD = 0.47) for the grasshopper Tropidacris collaris to a mean of −14.7 (SD = 0.56) for a termite (Nasutitermes sp.), a range similar to that of the vegetation. However, the common insectivorous and omnivorous vertebrates had intermediate values for δ13C, indicating that carbon from different autotrophic sources mixes rapidly as it moves up the food chain. Despite this mixing, the frogs and lizards generally had higher values of δ13C (x¯ = −21.7, SD = 1.6; x¯ = −21.9, SD = 1.8, respectively) than the birds (x¯ = −24.8, SD = 1.8) and the only species of mammal resident in the savanna (x¯ = −25.4), indicating that they are generally more dependent on, or more able to utilise, food chains based on C4 grasses.
ISSN: 0029-8549
Local de publicação: Inglaterra
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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