Bibliographic citations
Sánchez, P., (2009). Variación espacio temporal de la comunidad zooplanctónica en Bahía Paracas, Costa Central del Perú [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/2266
Sánchez, P., Variación espacio temporal de la comunidad zooplanctónica en Bahía Paracas, Costa Central del Perú [Tesis]. : Universidad Nacional Agraria La Molina; 2009. https://hdl.handle.net/20.500.12996/2266
@misc{renati/1116682,
title = "Variación espacio temporal de la comunidad zooplanctónica en Bahía Paracas, Costa Central del Perú",
author = "Sánchez Dávila, Pedro Pablo Alonso",
publisher = "Universidad Nacional Agraria La Molina",
year = "2009"
}
Paracas Bay is one of the most important recruitment areas of Paracas National Reserve (RNP), because it allows the repopulation of many species of fishes and invertebrates, serves for shelter for a large numbers of eggs, larvae and juvenile, also because of the maintenance of the genetic flow for benthic and zooplankton communities. However the zooplankton marine study in Perú is more focused in oceanic areas. This study has the objective to contribute to the knowledge of the structure and diversity of the zooplankton community in Paracas Bay from October 2005 until September 2006, for that reason 3 different deepness sampling points were evaluated. Abiotic variables were determined; such as temperature, dissolved oxygen and water transparency; as well as the biotic variables like displacement biovolumen, number of taxa, zooplanktonic density and the specific composition in each simple point. Univariate indexes were used, like Margalef's richness (d), Pielou's equitability (e), Simpson's dominance (1 - 1) and ShannonWiener's diversity (H”). The stations with major diversity were July (Z3) and September (Z1 and Z2). To determine spatial and temporal differences between the biotic variables, the non-parametric analysis Kruskal-Wallis (@ < 0,05) and homogeneous groups according to Mann-Whitneys’s U test with Bonferroni's correction were used. The multivariate techniques (PCA, CLUSTER, nMDS, SIMPER, ANOSIM and BIO-ENV) were used to explain the abiotic data, analyze the spatial and temporal community structure of the zooplanktonic assemblage and its correlation with the oceanographic variables, which indicates the existence of temporal variations but no spatial over the community structure of the zooplankton inside the bay. The copepod Acartia tonsa was the dominant species the entire year except in September, when the abundance of Cirripedia nauplii and the copepod Centropages brachiatus arose. Low positive correlations between abiotic variables and zooplanktonic densities were shown throughout the bay, although low positive and negative correlations were recorded in every station. Spearman's rank correlation between the abiotic variables with the biovolumen, number of taxa and diversity were evaluated; they showed a positive correlation with the biovolumen, some positive and negative correlations with the diversity and none with the number of taxa. Two subjective and descriptive aspects were considerate due to the sampling was done in shallower waters less than 14 m. The abundance of related phytoplankton and marine snow, which those were measured as semicuantitative using a scale from 1 to 4, in function with the coverage of those in the counting chamber (Bogorov). Those two variables do not have any relation to the zooplankton concentration, excepting one negative and significant correlation of the dependence between density and related phytoplankton in the third station of sampling. As general conclusion, the results of this study show three coastal zooplankton communities in Paracas Bay as three similar spatial patches which varies seasonally, the major part of the year are strongly dominated by one single species (4. tonsa) and finally they has low correlations with the evaluated abiotic variables during all the sampling period which have been influenced by the reduction of the water column.
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