Resumen del producto

In tropical mangroves, crustaceans are one of the most relevant components in terms of abundance, occurrence,biomass, function, and human welfare. Since these organisms are involved in the trophic dynamics of mangrovesand also, are important fishery resources, the study of carbon used by crustaceans in mangrove ecosystems isimportant to understand the food web functioning of mangroves and estuaries, and how energy and matter flowthrough these organisms, via their participation in different trophic pathways. We compared the isotopiccomposition (d13C/d15N) of carbon sources and macrobenthic crustacean species of three macrotidal (fringe,internal and external riverine) mangroves, located in the central Colombian Pacific, and used a Bayesianaproached to evaluate if geomorphology induces differences in the isotopic composition and in the relativecontribution of primary producers to different species of macrobenthic crustaceans. Differences were found in theisotopic composition between the three systems, with 13C values generally enriched for the external riverinemangrove, indicating a marine influence. The relative contribution of microphytobenthos with respect to otherprimary sources was highest in the three mangrove systems, followed by mangrove and seston in the internal andexternal riverine respectively, and macroalgae in fringe system. However, differences were found in thecontribution of all sources depending on the species and type of mangrove but trophic pathways of the systemsare the same. Our results confirm part of the hypothesis of this research, showing that geomorphologicalconfiguration of the habitat induces significative differences in the isotopic composition of primary sources andmacrobenthic crustaceans but, the carbon utilization patterns of macrobenthic crustaceans show the same maintrophic pathways (mangroves and microphytobenthos) in all three systems, due to the similar availability ofcarbon sources despite geomorphological differences.

Palabras clave: stable isotopes; Trophic pathway; Estuarine ecology; Colombian Pacific; mixing models

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