Particular structure of an epiphytic diatom assemblage living on Ploclamium cartilagineum (Lamoroux) Dixon (Rhodophyceae: Gigartinales).
DOI:
https://doi.org/10.37543/oceanides.v29i2.136Keywords:
Large diatoms, rhodophyte, Baja California peninsula, new recordsAbstract
This is the first record of an epiphytic diatom assemblage of Ploclamium cartilagineum. Fifteen
years ago observations on a specimen of P. cartilagineum revealed that large diatom of certain taxa occurred abundantly on its branches, and suggested also that it may harbor a particular diatom assemblage. Thus, we set out objective into identifying all the diatom taxa in the assemblage represented on the same P. cartilagineum
specimen, and to determine their proportional abundances. Overall 46 taxa of epiphytic diatoms were identified. The diatom assemblage was characterized by abundant large forms such as Gephyria media, and Hyalodiscus punctatus a new record for the region, and the small form Cocconeis californica. Also include is, Grammatophora macilenta a new record for the region. Hitherto rare taxa in the region were very common such as Rhabdonema adriaticum, Campylopyxys garkeana, and Melosira polaris/Melosira sol. Although the estimated species richness and diversity values are high as in other assemblages of benthic diatoms, its basic structure (floristics) in which large forms rival the smaller forms in number, makes this assemblage particular.
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