Abstract
The first floristic inventory of benthic diatoms is provided for the Bahia Magdalena-Bahia Almejas lagoon system. Samplings were carried out during November of 1999. The oxydized samples were mounted permanently. Eighty six diatom taxa were identified, out of which 59 are new records for the Bahia Magdalena area, and 12 taxa are new for the Baja California peninsula. Taxa recorded previously as rare in other substrata are common or abundant on the epiphytic macroalgae of mangrove prop roots. Other species are mainly epipelic forms, while 24 are commonly found as tychoplankton in the area. Certain taxa appear to be characteristic of mangrove systems in general.
Highlights
Much of the epiphytic flora growing on marine macrophytes are diatoms (Kita and Harada 1962, Jacobs and Noten 1980)
In this study we show the first results of the taxonomic survey of diatoms found on red mangrove (Rhizophora mangle L.) prop roots in order to determine which diatom species may determine the structure of the epiphytic assemblage on mangrove prop roots
A total of 86 diatom taxa were identified as epiphytes of Rhizophora mangle prop roots (Table 1). 59 taxa are new records for the system
Summary
Much of the epiphytic flora growing on marine macrophytes are diatoms (Kita and Harada 1962, Jacobs and Noten 1980) These may contribute significantly to the primary production of mangrove systems where diatoms from different substrata are the main microalgae forms (Siqueiros Beltrones 2002). Mangroves constitute one of the most conspicuous tropical components of the system, and along with the ichthyological component it may have persisted since the peninsula separated from the Mexican continent six to seven m.y. ago (Castro Aguirre and Torres Orozco 1993). This area is of great importance for the fishing industry of the state. In this study we show the first results of the taxonomic survey of diatoms found on red mangrove (Rhizophora mangle L.) prop roots in order to determine which diatom species may determine the structure of the epiphytic assemblage on mangrove prop roots
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