Caracterización de la taxocenosis de diatomeas epifitas de Thalassia testudinum K.D. Koenig en la costa de Campeche, México
Diatoms are one of the main components of microphytobenthos, the y contribut e an estimate of 20 - 25% of the net global primary production (Werner, 1977) and have a strong influence on the type of microbial community that characterizes specific habitat s (Siqueiros - Beltrones, 2002). T he objectiv...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | México |
| Institución: | Universidad Autónoma Metropolitana |
| Repositorio: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | español |
| OAI Identifier: | oai:bindani.izt.uam.mx:mp48sc79x |
| Acceso en línea: | https://doi.org/10.24275/uami.mp48sc79x |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/LEM/Algae info:eu-repo/classification/LEM/Diatomeas info:eu-repo/classification/LEM/Algas info:eu-repo/classification/LEM/Diatoms info:eu-repo/classification/cti/2 |
| Sumario: | Diatoms are one of the main components of microphytobenthos, the y contribut e an estimate of 20 - 25% of the net global primary production (Werner, 1977) and have a strong influence on the type of microbial community that characterizes specific habitat s (Siqueiros - Beltrones, 2002). T he objective of this study was to describe the str ucture of the associations of epiphytic diatoms on Thalassia tetsudinum and their relationship with the environmental characteristics under which they develop i n three areas of seagrass beds in the coast al state of Campeche, M é xico. The three surveyed l oc alities (Petenes, Costa and Champotón) show ed significant differences in most of the environmental variables measured (salinity, temperature, pH, silicates, nitrates and nitrites) and in the structure of the diatom taxocenos i s. A total of 301 taxa at spec ies and subspecies level of epiphytic diatoms comprised in 70 genera were identified for the coast of Campeche. The genus which had a greater number of species was Mastogloia with 76 taxa, followed by Nitzschia with 25, Navicula 21, Amphora 20, Cocconeis 1 2 and Halamphora with 11. The genus Cocconeis was numerically more important with an abundance of 6 , 670 individuals followed by Ma s togloia with 5 , 665, together these account for 40.72% of abundance. Based on the Biological Value Index the most important s pecies was Cocconeis placentula var. lineata (BVI 183) with an abundance of 3,427 valves. Freshwater species were also identified, as is the case of C. placentula var. lineata , C . placentula var. eugl y pta , Brachysira cf. estonarium and Fragilaria cf. vire scens . The presence and abundance of these taxa was a key element for the differentiation of localities. In this study a relationship between environmental variables and taxocenosis structure was not observed , possibly b ecause of the discrete manner on w hich the sampling of the epiphytic diatom taxocenos i s was done. Thus , it is likely that the relationship between th ese and the physi c ochem i cal variables under which it develops was not evident . E nvironmental requirements for each species make it difficult to recognize what environmental factors have the most influence over benthic diatoms. |
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