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Sánchez, A., D., Anguas-Cabrera, K., Camacho-Cruz, M.C., Ortiz-Hernández & S., Aguiñiga-García (2020). Spatial and temporal variation of the d15N in Thalassia testudinum in the Mexican Caribbean (2009–2017). Marine and Freshwater Research. 71(8): 905-912. DOI: 10.1071/MF19105.

Spatial and temporal variation of the d15N in Thalassia testudinum in the Mexican Caribbean (2009–2017)

Alberto Sánchez, Dilian Anguas-Cabrera, Karla Camacho-Cruz, M. Concepción Ortiz-Hernández y Sergio Aguiñiga-García

Wastewater pollution in seagrass has been documented for decades. In areas where baseline data are lacking,such as the Mexican Caribbean, the d15N of seagrass can provide information on status and trends. The aims of this studywere to determine the spatial and temporal variation in d15N values of T. testudinum from 2009 to 2017, to explore thenature and causes of isotopic variability, which must be fully understood, and to examine how isotopic variability is linkedto wastewater on the coast. Samples of T. testudinum were collected during 2011–2017 in Cancu´n and from 2009 to 2017 inMahahual, and analysed on a mass spectrometer. The d15N values in Cancu´n (9.01.3%) were significantly (P,0.005)higher than those in Mahahual (1.9  0.9%). Our results reflect the continuous supply of wastewater as a source of 15N inCancu´n and the atmospheric deposition of dissolved inorganic nitrogen from uncontaminated groundwater in Mahahual.Mahahual is an ideal site to continue environmental monitoring of the healthy seagrass in the southern Mexican Caribbean.Meanwhile, measures on the treatment and final disposal of wastewater in Cancun must be addressed with a great priority.

Palabras clave: Estuary; FISH; Algae; Plankton; CORAL; river; lake; invertebrate; Crustacea; mollusca; stream; fisheries; biology; ecology; biogeochemistry; physiology; genetics; Phylogeography; hydrology; oceanography; toxicology; CSIRO; csiro publishing; publications; science; educational; scientific; journal; journals; Australia; Australian; research; international

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