Abstract
Oyster beds have an important impact on coastal ecosystems. In this work, samplings were done during the dry, the rainy and the ?North wind? seasons, in eight oyster reefs at the Lagoons of Mecoacán, Carmen and Machona, in Tabasco, Mexico. The a diversity was calculated with the Shannon-Wiener, Simpson and Margalef indexes. An Analysis of Variance was done to evaluate if there was a difference in the average of the indexes at each reef in every season, verifying the assumptions of normality and variance homogeneity. In the case of mollusk richness, we found 13 families, 13 genera and 15 species of gastropods, as well as 8 families, 10 genera and 11 species of bivalves. Seven families, 11 genera and 12 species of crustaceans were recorded. In the case of mollusks, the highest average value of species richness was recorded during the dry season, in Puente de Ostión reef (DMg= 13.6), whereas in the case of species diversity, the highest average value was recorded during the ?North wind? season, at Largo (H? = 0.77). The dominant mollusks during the three seasons were Ischadium recurvum, Isognomon alatus and Crepidula plana. In the case of crustaceans, the highest average value, both in species richness and diversity, was recorded during the rainy season (DMg= 15.50, H? = 1.15) at Pinzón reef. The dominant crustaceans were Balanus eburneus, Balanus improvisus, Eurypanopeus depressus and Petrolishtes armatus.
Highlights
Las lagunas costeras son cuerpos acuáticos litorales que tienen en su mayoría comunicación permanente o efímera con el mar, se definen como el encuentro entre dos masas de agua de diferentes características (Contreras 1985)
In the case of mollusk richness, we found 13 families, 13 genera and 15 species of gastropods, as well as 8 families, genera and species of bivalves
En lo que se refiere a los crustáceos, el valor promedio mas alto tanto de la riqueza como de la diversidad de especies se registraron en la temporada de lluvias (DMg= 15.50, H’= 1.15 bits/ind.) en el banco Pinzón
Summary
En el caso de los Índices de Margalef y Shannon-Wiener se utilizo el logaritmo en base 10, así como el inverso del Índice de diversidad de Simpson para calcular la dominancia de especies. Durante la temporada de secas los valores del Índice de Margalef fueron normales y homocedásticos (W*= 0.83, p= 0.0823 y F = 2.7819 p = 0.0879), existiendo diferencia significativa en el valor promedio de dicho índice entre los bancos (F= 9,68, p≤ 0.0001), siendo diferente de acuerdo al Test de Turkey el banco Puente de Ostión (p≤ 0.05), ya que fue el que registró la riqueza de especies promedio mas alta (Fig. 1). En lo que se refiere a la diversidad de especies y de acuerdo al análisis de varianza existió diferencia significativa en el valor promedio del Índice de Shannon-Wiener entre los seis bancos ostrícolas muestreados durante esta
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
