Planktonic silicoflagellates (Dictyochophyceae) from the Mexican Pacific Ocean

Citation
Du. Hernandez-becerril et E. Bravo-sierra, Planktonic silicoflagellates (Dictyochophyceae) from the Mexican Pacific Ocean, BOTAN MARIN, 44(5), 2001, pp. 417-423
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aquatic Sciences
Journal title
BOTANICA MARINA
ISSN journal
0006-8055 → ACNP
Volume
44
Issue
5
Year of publication
2001
Pages
417 - 423
Database
ISI
SICI code
0006-8055(200109)44:5<417:PS(FTM>2.0.ZU;2-L
Abstract
One hundred and sixty Formalin-preserved net samples were collected from di fferent zones in the Mexican Pacific Ocean during 11 cruises and other surv eys (1984-1999) to study the composition of silicoflagellates. A few bottle samples from a coastal zone containing living material were also analyzed. Observations were made by light and scanning electron microscopy., We desc ribe five taxa of silicoflagellates: four species and one variety, includin g some morphological variants (traditionally considered as recognized speci es or varieties). Living specimens of Dictyocha californica were also studi ed, from which we consider it to be an extant species. Dictyocha calida may also be regarded as an extant species, as it is very characteristic and re adily distinguished, with no intergrades with related taxa, but no living c ells or cells with chloroplasts were found. A discussion of morphological v ariation of some species within the group and the characters of the siliceo us skeleton as taxonomic criteria are given. The most ubiquitous species wa s Dictyocha fibula (and its related 'species' or varieties), found in most of the locations sampled, whereas D. californica and D. fibula var. robusta are regarded as neritic, warm water forms.