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A compositional analysis approach to phytoplankton composition in coastal Mediterranean wetlands: Influence of salinity and nutrient availability

Mediterranean wetland communities are strongly constrained by hydrological perturbations and the water flow regime. Salinity and nutrient availability have often been considered the most important variables determining changes in the phytoplankton community of coastal wetlands. Ratios between the main environmental variables often have more relevance than the absolute values of each variable; however, in most cases ratios are not suitable for use in multivariate models commonly used by limnologists. The main objective of the present work was to identify the main variables or variable ratios that are the driving forces of the major phytoplankton taxonomic groups in Mediterranean coastal wetlands, using compositional data analysis techniques (CoDa). With this aim, eleven shallow wetlands (6 in Empordà, 5 in Doñana, NE and SW of Spain respectively) were sampled in winter and spring 2007. Two approaches were used: the first one using raw data and the second one using CoDa techniques to transform data. Our results show that differences in hydrological patterns led to three main community assemblages, ranging from communities dominated by typical marine taxa (diatoms and dinoflagellates) when the marine influence was high, to communities dominated by cyanobacteria during confinement and when inorganic nitrogen was scarce. In freshwaters with a high turnover rate, the community was dominated by opportunistic chlorophytes and cryptophytes that need inorganic nitrogen availability. When the raw data and CoDa approaches were compared, the CoDa approach permitted a better ecological interpretation of the phytoplankton community and the main ecological processes. Salinity was the main environmental determinant with both approaches, while the second CoDa RDA axis was related with the balance between the peptidase and phosphatase enzyme activities, confirming the relevance of nutrient retrieval processes in determining phytoplankton composition. We recommend the use of CoDa techniques for analyses of planktonic communities, such as the one presented here, in order to improve the interpretation of both existing and future datasets

This work was funded by a grant from the Ministerio de Ciencia e Innovacion (ref. CGL2011-23907); and also by an ICTS project from the Estacion Biologica de Donana (CSIC) and the Spanish Ministerio de Educacion y Ciencia (ref: ICTS 24/2007)

© Estuarine, Coastal and Shelf Science, 2014, vol. 136, núm. 1, p. 72-81

Elsevier

Autor: López i Flores, Rocío
Quintana Pou, Xavier
Romaní i Cornet, Anna M.
Bañeras Vives, Lluís
Ruiz Rueda, Olaya
Compte Ciurana, Jordi
Green, Andy J.
Egozcue, Juan José
Data: 2014
Resum: Mediterranean wetland communities are strongly constrained by hydrological perturbations and the water flow regime. Salinity and nutrient availability have often been considered the most important variables determining changes in the phytoplankton community of coastal wetlands. Ratios between the main environmental variables often have more relevance than the absolute values of each variable; however, in most cases ratios are not suitable for use in multivariate models commonly used by limnologists. The main objective of the present work was to identify the main variables or variable ratios that are the driving forces of the major phytoplankton taxonomic groups in Mediterranean coastal wetlands, using compositional data analysis techniques (CoDa). With this aim, eleven shallow wetlands (6 in Empordà, 5 in Doñana, NE and SW of Spain respectively) were sampled in winter and spring 2007. Two approaches were used: the first one using raw data and the second one using CoDa techniques to transform data. Our results show that differences in hydrological patterns led to three main community assemblages, ranging from communities dominated by typical marine taxa (diatoms and dinoflagellates) when the marine influence was high, to communities dominated by cyanobacteria during confinement and when inorganic nitrogen was scarce. In freshwaters with a high turnover rate, the community was dominated by opportunistic chlorophytes and cryptophytes that need inorganic nitrogen availability. When the raw data and CoDa approaches were compared, the CoDa approach permitted a better ecological interpretation of the phytoplankton community and the main ecological processes. Salinity was the main environmental determinant with both approaches, while the second CoDa RDA axis was related with the balance between the peptidase and phosphatase enzyme activities, confirming the relevance of nutrient retrieval processes in determining phytoplankton composition. We recommend the use of CoDa techniques for analyses of planktonic communities, such as the one presented here, in order to improve the interpretation of both existing and future datasets
This work was funded by a grant from the Ministerio de Ciencia e Innovacion (ref. CGL2011-23907); and also by an ICTS project from the Estacion Biologica de Donana (CSIC) and the Spanish Ministerio de Educacion y Ciencia (ref: ICTS 24/2007)
Format: application/pdf
ISSN: 0272-7714
Accés al document: http://hdl.handle.net/10256/11313
Llenguatge: eng
Editor: Elsevier
Col·lecció: MICINN/PN 2012-2015/CGL2011-23907
MICYT/PN 2007-2008/ICTS-RBD 24/2007
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.ecss.2013.11.015
Articles publicats (D-CCAA)
És part de: © Estuarine, Coastal and Shelf Science, 2014, vol. 136, núm. 1, p. 72-81
Drets: Tots els drets reservats
Matèria: Fitoplàncton -- Composició
Phytoplankton -- Composition
Zones humides
Wetlands
Títol: A compositional analysis approach to phytoplankton composition in coastal Mediterranean wetlands: Influence of salinity and nutrient availability
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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