Bibliographic citations
Vélez, J., (2019). Efectos de perturbaciones naturales y antropogénicas sobre las comunidades macrobentónicas en playas arenosas del cantón San Vicente, Manabí-Ecuador [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/4363
Vélez, J., Efectos de perturbaciones naturales y antropogénicas sobre las comunidades macrobentónicas en playas arenosas del cantón San Vicente, Manabí-Ecuador []. PE: Universidad Nacional Agraria La Molina; 2019. https://hdl.handle.net/20.500.12996/4363
@mastersthesis{sunedu/3190827,
title = "Efectos de perturbaciones naturales y antropogénicas sobre las comunidades macrobentónicas en playas arenosas del cantón San Vicente, Manabí-Ecuador",
author = "Vélez Falcones, Jorge Enrique",
publisher = "Universidad Nacional Agraria La Molina",
year = "2019"
}
In this study, effects of natural and anthropogenic disturbances on the benthic macro community of three sandy beaches of Ecuador are described, based on the analysis of 432 sediment samples collected with a metallic quadrata of 0.1 m-2 coverage, at 4 intertidal levels, during October 2015 to March 2016. In order to identify the critical variables at spatial and temporal scale, a Principal Components Analysis (ACP) was used, in order to identify the groups in the multivariate management, a classification analysis was carried out, and To evaluate the possible similarities between the stations and sampling dates, a nonparametric analysis of non-metric scaling (NMDS) was performed. To test the influence of natural and anthropogenic disturbances on the macrobenthos, a Pearson regression and correlation analysis was performed, also, to determine the level of disturbance of the communities, the biomass abundance (ABC) curves method was used with his statistic W. The results showed that the hypothesis was partially true, since natural disturbances (salinity, oxygen and granulometric composition) had an effect on community parameters (Shannon diversity, Equity, Margalef richness and specific richness, anthropogenic disturbance (tourist influx) and the community parameters no significant relationships were found (<0.05). Abundance-biomass curves, allowed to describe the degree of disturbance of the beaches evaluated, indicating that Briceño was the most disturbed than the beach of Canoa and the less disturbed Punta Napo, mostly affected by low salinity, than by tourist influx. 33 taxonomic items belonging to 6 phyla were identified, presenting a greater number of Punta Napo species. Its general distribution reflects three distinct areas, the supramareal zone frequently inhabited by polychaetes and bivalves of the Donacidae family, the crustacean of the Ocypodidae family. The mesomareal, characterized by the gastropod of the Olividae family, polychaetes, bivalves of the family: Veneridae, Tellinidae. The inframareal typified by bivalves of the Tellinidae and Mactridae families (Strigilla chroma, Mactrellona alata respectively), Decapod crustaceans of the Hippidae Albuneidea families, polychaetes and amphipods.
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