DOMOIC acid, Pseudo-nitzschia spp and potential vectors at the base of the pelagic food web over the northern Patagonian coast, Southwestern Atlantic
| Autor: | Jose Luis Esteves, Tami Mailén García, Miriam Edith Solis, Valeria Carina D'agostino, Flavio E. Paparazzo, Rosa E. Pettigrosso, Gaston Osvaldo Almandoz, Anabela A. Berasategui, Bernd Krock, Gabriela Noemí Williams, Elena Fabro, María Sofía Dutto, Monica Susana Hoffmeyer, Maximiliano Darío Garcia |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences biology 010604 marine biology & hydrobiology Domoic acid Pelagic zone Aquatic Science Oceanography biology.organism_classification 01 natural sciences Food web chemistry.chemical_compound Geography chemistry 14. Life underwater Pseudo-nitzschia Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | EPIC3Journal of Marine Systems, Elsevier, 212, pp. 103448, ISSN: 09247963 |
| Popis: | Plankton composition and density, and domoic acid (DA) content in microplankton and mesozooplankton were assessed over the northern Patagonian coastal shelf in late austral summer 2013. Maximum values of DA in these two plankton fractions as well as maximum densities of both Pseudo-nitzschia spp. (mainly the toxigenic P. australis) and DA potential vectors were only detected on the southern coast of San Matías Gulf and the eastern coast of Valdés Peninsula. In this zone, waters were characterized by low temperature, high nitrate, and intermediate values of silicic acid and phosphate. Based on the high association between the DA values recorded and the values of either micro- and mesozooplankton grazer density or biomass, we inferred that DA transfer from Pseudo-nitzschia spp. occurred largely through the small copepods Euterpina acutifrons and Oithona nana, Calanidae nauplii and Calanidae copepodites, Noctiluca scintillans, and euphausiid developmental stages. Small copepods, Calanidae nauplii and copepodites, and cladocerans were proposed as novel DA vectors although this suggestion requires experimental confirmation. This study provides the first lines of evidence of the co-occurrence of Pseudo-nitzschia spp. blooms with DA production and accumulation in mesozooplanktonic grazers at the base of the food web and of the environmental and oceanographic conditions that seem to favor these processes over the northern Patagonian shelf coasts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|