Carregant...
Tipus de document
TesiVersió
Versió publicadaData de publicació
Llicència de publicació
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/220863
Planktonic coccolithophores of the NW Mediterranean
Títol de la revista
Autors
ISSN de la revista
Títol del volum
Resum
[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.
Descripció
Matèries
Matèries (anglès)
Citació
Col·leccions
Citació
CROS I MIGUEL, M. lluïsa. Planktonic coccolithophores of the NW Mediterranean. [consulta: 28 de novembre de 2025]. [Disponible a: https://hdl.handle.net/2445/220863]