Nitrogen isotopic characterisation of macroalgae blooms from different sites within a subtropical bay in the Gulf of California
| Autor: | Noemi Espinosa-Andrade, Margarita Casas-Valdez, Alejandra Piñón-Gimate, Alberto Sánchez |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Water mass 010504 meteorology & atmospheric sciences Nitrogen Fishing Sewage Subtropics Aquatic Science Oceanography 01 natural sciences Ulva Nutrient medicine Mexico 0105 earth and related environmental sciences Nitrogen Isotopes Ecology business.industry 010604 marine biology & hydrobiology δ15N Eutrophication Seasonality Seaweed medicine.disease Pollution Bays Environmental science business Bay Environmental Monitoring |
| Zdroj: | Marine Pollution Bulletin. 116:130-136 |
| ISSN: | 0025-326X |
| DOI: | 10.1016/j.marpolbul.2016.12.075 |
| Popis: | In La Paz Bay conspicuous macroalgal blooms of Ulva spp. are recurrent in the waterfront of the city; studies relate its growth to seasonality and nutrient enrichment but their relative influence is not known. We use the δ15N to discern amongst nitrogen sources at three sites with different substratum and anthropogenic activities. Ulva blooms were monitored monthly at San Juan de la Costa (SJC), Casa del Marino (CM) and El Tecolote (TE). Species presence varied between sites and months. At SJC Ulva displayed the highest signal of δ15N associated with fishing products and local mining wastewaters (19.5‰). CM showed isotopic values related to sewage waters (13‰). The δ15N of species at TE were the lowest. We found higher isotopic signatures than in other tropical/subtropical regions, associated with nutrient rich water masses. Ulva species can be used to trace and discern amongst different sources of nitrogen from natural or anthropogenic sources. |
| Databáze: | OpenAIRE |
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