Use of stable isotopes in the evaluation of fish trophic guilds from a tropical hypersaline lagoon
| Autor: | Abílio Soares Gomes, Marcos Alberto Lima Franco, Carlos Eduardo de Rezende, Alejandra Filippo Gonzalez Neves dos Santos, Marcelo Gomes de Almeida |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Journal of the Marine Biological Association of the United Kingdom. 100:979-988 |
| ISSN: | 1469-7769 0025-3154 |
| DOI: | 10.1017/s0025315420000879 |
| Popis: | Environmental factors, size-related isotopic changes of the most abundant species and isotopic niche overlap were investigated using stable isotopes in order to evaluate spatial changes of fish trophic guilds in the Araruama Lagoon. Based on 440 muscle samples, 17 fish species were grouped into five trophic guilds. Mean salinity was above 40 at both sites sampled and a significant spatial difference was observed. The highest δ13C mean value was observed for an omnivorous species, whereas the lowest carbon signatures were found for the three fish species belonging to the planktivorous guild. Analysis of the carbon signature of fish species in lower trophic levels showed influence of salinity variation, whilst size appeared to play a role for others. A narrow δ15N difference was observed, but the piscivorous fish species showed the highest δ15N values. The Standard Ellipses Analysis (SEA) detected spatial differences and varying degrees of isotopic niche overlap among trophic guilds, but the percentages of most overlaps ( |
| Databáze: | OpenAIRE |
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