Changes in microplanktonic protists assemblages promoted by the thermocline induced stratification around an oceanic archipelago
| Autor: | Sigrid Neumann-Leitão, Jana Ribeiro de Santana, Alejandro Esteweson Santos Faustino da Costa |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences Mixed layer polycystine radiolarians Stratification (water) 01 natural sciences Water column ecological indicators tropical oceans lcsh:Science Nansen bottle 0105 earth and related environmental sciences geography Multidisciplinary geography.geographical_feature_category biology 010604 marine biology & hydrobiology Dinoflagellate tintinnid ciliates vertical distribution biology.organism_classification Dinoflagellates Oceanography Archipelago lcsh:Q Thermocline Geology Tintinnid |
| Zdroj: | Anais da Academia Brasileira de Ciências, Vol 90, Iss 2 suppl 1, Pp 2249-2266 Anais da Academia Brasileira de Ciências, Volume: 90, Issue: 2 Supplement 1, Pages: 2249-2266, Published: AUG 2018 Anais da Academia Brasileira de Ciências v.90 n.2 suppl.1 2018 Anais da Academia Brasileira de Ciências Academia Brasileira de Ciências (ABC) instacron:ABC |
| ISSN: | 1678-2690 |
| Popis: | In the area around the archipelago of São Pedro e São Paulo (ASPSP), a set of small rocky islands in the Equatorial Atlantic, the thermocline begins at a more superficial depth than in the surrounding waters. This raises the question if there is any change in heterotrophic microplanktonic protists assemblages occurring in the surface mixed layer and in the subsurface layer. To answer this question, we sampled seawater in seven depths (between 1-100 m) with a 10L Niskin bottle and obtained temperature and salinity profiles with a CTD at eight sites around the ASPSP. The depth of the surface mixed layer varied between 18-63 meters. Dinoflagellates dominated in terms of abundance representing over 80% and 65% of the individuals found in the surface and subsurface layers, respectively. A PERMANOVA test revealed significant differences (p < 0.001) among the dinoflagellate and tintinnid assemblages occurring in both layers, but no evidence for difference in the radiolarian assemblage was detected. Good ecological indicators were found mainly within the dinoflagellate assemblage. The thermocline induced stratification allowed the development of different microplanktonic protists assemblages above and under the depth of the surface mixed layer in the upper 100 m of the water column. |
| Databáze: | OpenAIRE |
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