![]() The biofouling of surfaces submerged in the marine environment includes primary colonization of the substrate by microorganisms including bacteria, microalgae, and microscopic reproductive propagules of macroorganisms such as algal zoospores. Albeit, this difference could be attributed to the number of specimens collected per macroalga species. The number of diatom taxa per macroalgae species was also high, ranging from 89 (Codium spp.) to 143 (L. The most abundant taxa were Cocconeis disculus and C. Out of 75 genera recognized the best represented were: Mastogloia (25 species), Amphora (23), Navicula (23), Nitzschia (22), Cocconeis (22), Lyrella (12) and Achnanthes (11). This is the largest species richness recorded for this type of substrate, and out of which 44 are new records for the region. A total of 278 diatom taxa were recorded. The most conspicuous out of twelve macroalgae taxa were: Hydroclathrus clathrathus, Laurencia pacifica, L. in june and december 2001, and on april, may and july 2002, collecting the most frequent macroalgae taxa. Samplings were carried out in a macroalgae bed located in Punta Roca Caimancito beach, B. Floristics of epiphytic diatoms in a patch of subtropical macroalgae The species composition of epiphytic diatom assemblages found on different taxa of subtropical macroalgae was determined. pacifica), aunque las diferencias podrían deberse al número de especímenes procesados por especie de macroalga. El número de taxa de diatomeas por especie hospedera también fue alto y varió entre 89 ( Codium spp.) y 143 ( L. Los taxa más abundantes fueron Cocconeis disculus y C. De los 75 géneros reconocidos de diatomeas, los mejor representados fueron: Mastogloia (25 especies), Amphora (23), Navicula (23), Nitzschia (22), Cocconeis (22), Lyrella (12) y Achnanthes (11). El examen de la flora epifítica redituó 278 taxa de diatomeas, que es la máxima riqueza registrada para este tipo de sustrato, y de los cuales 44 son nuevos registros para la región. Se identificaron 13 especies de macroalgas, de las cuales: Hydroclathrus clathrathus, Laurencia pacifica, L. S., se tomaron muestras de las macroalgas sobresalientes, en junio y diciembre de 2001, y abril, mayo y julio del 2002. Para ello, en un manchón ubicado en la playa Punta Roca Caimancito, B. Se determinó la composición de especies de diatomeas epifitas en macroalgas de distintos taxa en una zona subtropical. ![]() This similarity could be due to the constant resuspension in the sediment-water interface, which increases the availability of diatoms in the water column and the eventual colonization of the alternative substratum in the vicinity of this interface. By contrast, the Bray-Curtis dissimilarity analysis showed that the diatoms species composition was similar in both faces of the plates (smooth and rough), as well as between the fiberglass and the sediment. The NMDS ordination and PERMANOVA analyses showed a change in species composition from the initial to the monthly phase. Diversity index values (H’) ranged from 2.97 to 3.92 for fiberglass, and from 2.96 to 4.25 for sediment. australis, Actinoptychus senarius, and Grammatophora marina, being these also abundant in sediment. parva, Cymatosira lorenziana, Paralia sulcata, Delphineis surirella var. The most abundant species on the plates were Cocconeis scutellum var. A total of 89 taxa belonging to 42 genera were recorded, from which 75 of them were recorded on the smooth side of the plates, 66 on the rough side, and 77 taxa in the surrounding sediment. Also, sediment samples were collected as control substratum nearby the site where the structure was installed. The plates were initially removed weekly during the first month, and then monthly during the next three months. The stainless steel structure was installed at 10 m depth in the shallow subltidal zone. For this research six out of 24 plates were analyzed. For this purpose, a support structure made of stainless steel (50x50 cm) was constructed with 24 fiberglass plates (10x5x0.4 cm), which have two faces, one smooth and another rough. This study aimed to determine the assemblage structure of marine benthic diatoms during the colonization process on an alternative substratum (fiberglass) at a local spatial scale (one stationary site at Telchac, Yucatan) and temporal scale of short to medium term (16 weeks). During the first stage of colonization, diatoms play a role because they are able of colonizing oportunistically different types of substrata, such as fiberglass. An example is the colonization of aquatic micro and macro organisms which adhere on underwater structures such as the hulls of watercrafts, ropes and oil platforms, and this phenomenon is called biofouling. Colonization is a process in which the organisms occupy an area for the first time.
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