Abstract
Nutrient sources of San Quintin Bay, a coastal lagoon affected by coastal upwelling off Baja California (Mexico), were traced using generalized additive (mixed) models (GAMM) to the stable nitrogen isotopic composition, C:N and N content of two co-occurring macrophytes (the macroalgae Ulva spp. and the seagrass Zostera marina). The geochemical tracers followed a spatial trend that partly responded to the long-term nutrient gradient from the ocean towards the interior of the bay. N content in Z. marina and Ulva spp. decreased linearly (while C:N increased) towards the middle section of the bay to concentration levels that indicate potential N limitation for growth. Concurrently midway into the bay (6–9 km), the δ15N of both macrophytes showed a gradual enrichment in 15N reflecting progressive denitrification. The spatial pattern of δ15N and the decrease in C:N of the macrophytes towards the innermost section of the bay indicated an additional nonoceanic source of dissolved nitrogen in this zone. The similarity of the δ15N pattern of Z. marina and Ulva spp. implies that their δ15N composition is mainly controlled by the availability of N, in spite of the physiological differences between taxa. A better fit of GAMM to N content and C:N was obtained for Z. marina than for Ulva spp. indicating that the former delineate more steadily and smoothly the influence of upwelling along the spatial gradient. Nonetheless, Ulva spp. may be analyzed in combination with Z. marina to characterize the environmental conditions at the time of sampling.
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Acknowledgments
This study was partially funded by a Consejo Nacional de Ciencia y Tecnología (CONACYT) grant 134381 to SEIO and from internal funds from Universidad Autónoma de Baja California (UABC) to JDCB. We thank Victor Camacho for sharing the hydrological data presented in this study, derived from previously published work (cited therein). We thank Victor Camacho and Stephen V. Smith for the valuable comments to an early version of this paper. Eduardo Ortiz provided valuable help in the field and in the lab. We also thank Vicente and Vicentito Guerrero, Agromarinos, and Ostiones Guerrero for their valuable logistic support in the field. This work benefited greatly from helpful suggestions made by Ken Dunton and two anonymous reviewers, for whom we are grateful. Likewise, we are enormously grateful to Cathy Harris who kindly accepted to copyedit this document.
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Carriquiry, J.D., Jorgensen, P., Villaescusa, J.A. et al. Isotopic and Elemental Composition of Marine Macrophytes as Biotracers of Nutrient Recycling Within a Coastal Lagoon in Baja California, Mexico. Estuaries and Coasts 39, 451–461 (2016). https://doi.org/10.1007/s12237-015-9992-9
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DOI: https://doi.org/10.1007/s12237-015-9992-9