Planktonic coccolithophores of the NW Mediterranean
[eng] This thesis deals with haptophytic algae that in a continuous way or at some point in their life cycle they produce and carry coccolites. To these algae are called coccolithophorals, coccolithophorids and also coccolithophores; Currently, its name is the subject of debate and its taxonomy is o...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/220863 |
| Acceso en línea: | https://hdl.handle.net/2445/220863 http://hdl.handle.net/10803/694379 |
| Access Level: | acceso abierto |
| Palabra clave: | Ecologia Cromòfits Algues marines Plàncton Carbonats Mediterrània (Mar) Ecology Chromophyta Marine algae Plankton Carbonates Mediterranean Sea |
| Sumario: | [eng] This thesis deals with haptophytic algae that in a continuous way or at some point in their life cycle they produce and carry coccolites. To these algae are called coccolithophorals, coccolithophorids and also coccolithophores; Currently, its name is the subject of debate and its taxonomy is ongoing change. The work has been carried out in the Catalan-Balearic Sea, in the northwest of the Mediterranean. Seawater samples were used to carry out this study collected at different depths (mainly between 0 and 100 meters) and surface samples of sediments were also observed. The recognition and counting of the species has been carried out with the techniques Scanning Electron Microscopy (SEM). In order to compare methodologies, seawater samples were filtered with and without prior fixation (the fixation used was neutralized formaldehyde). It was observed that the previously fixed samples presented important losses of coccolithophores, especially of the most delicate taxa. In the present study, 166 coccolithophores have been recognized, of which only 102 species and subspecies have formal names in the literature. It is noteworthy the discovery of a significant number of combined cocospheres, that they carry coccolites belonging to species recognized as different; These "hybrid" specimens are considered very valuable to understand life cycles, as they can represent a moment of phase change of the organism. The different taxa found as well as the cocospheres are illustrated in this report with micrographs carried out with the MEB. |
|---|