a-Diversity of epilithic diatoms in the San Ignacio oasis Baja California Sur, Mexico.
DOI:
https://doi.org/10.37543/oceanides.v24i2.59Keywords:
epilithic diatoms, oasis, Baja California Peninsula, San Ignacio, diversityAbstract
Se proporciona el primer registro de diatomeas bentónicas epilíticas para el oasis de San Ignacio, B. C. S., México. Se realizaron dos muestreos (enero de 2007 y en julio de 2008) tratando de representar las épocas de invierno y verano. No obstante que los datos de temperatura fueron puntuales, se observaron diferencias estadísticas (p<<> 0.05) entre meses, lo que permitió discriminar verano e invierno. Los valores de pH y conductividad no mostraron diferencias estadísticas (p>0.05) entre épocas. Se reconocieron un total de 73 taxa de diatomeas epilíticas a niveles de especie, variedad y forma. De éstos, 66 se registraron en julio y 37 en enero; 29 taxa estuvieron presentes en ambos muestreos, 37 sólo en julio y 7 en enero. La mayor riqueza de especies se registró en julio (S=47) y la mínima en enero (S=14). En verano se registraron los valores más elevados de diversidad (H'=4.06, S=39); mientras que en enero se obtuvo el valor mínimo (H'=2.42, S=13). Las diferencias entre los valores de diversidad según la época de muestreo fueron significativas (p>0.05). La mayoría de las diatomeas identificadas fueron pennadas: 69 taxa (en 32 géneros); sólo 5 especies de los géneros Cyclotella y Stephanodiscus fueron centrales. La especie más frecuente y abundante fue Denticula kuetzingii que estuvo presente en todos los sitios de muestreo en ambas temporadas, con una abundancia relativa superior al 50%. Los análisis de similitud (cualitativos/cuantitativos) permitieron reconocer una asociación representativa del verano y otra del invierno. α-diversity of epilithic diatoms in the San Ignacio oasis Baja California Sur, México The first record of benthic epilithic diatoms for the oasis of San Ignacio, B.C.S., México is presented. Two samplings were conducted in January 2007 and July 2008 in order to represent winter and summer conditions, respectively. Although temperature data were punctual, statistical differences were noted between months (p<<>0.05), which allow discrimination of summer and winter. Conductivity and pH values did not show statistical differences (p> 0.05). A total of 73 taxa of epilithic diatoms were identified including species, variety and form levels. From these, 66 were recorded in July and 37 in January. Twenty nine taxa occurred in both sampling periods, 37 only in July and 7 in January only. Highest species richness was observed in July (S=47) and the lowest in January (S=14). Highest species diversity values occurred in summer (H´= 4.06, S=39), whilst January showed the lowest diversity (H´= 2.42, S= 13). Species diversity values were statistically different (p>0.05) between sampling periods. Most of the identified diatoms were pennate forms: 69 taxa (32 genera), while only five species of Cyclotella and Stephanodiscus were centric forms. The most frequent and abundant taxon was Denticula kuetzingii which occurred in all sampling sites and both periods with a relative abundance higher than 50%. Qualitative and quantitative similarity analyses allow the definition of two associations, one for summer and another for winter conditions.Downloads
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