Species-specific variation in the phosphorus nutritional sources by microphytoplankton in a Mediterranean estuary

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dc.contributor.author Martínez-Soto, M. C.
dc.contributor.author Basterretxea, G.
dc.contributor.author Garcés, E.
dc.contributor.author Anglès, S.
dc.contributor.author Jordi, A.
dc.contributor.author Tovar-Sanchez, A.
dc.date.accessioned 2019-07-04T07:52:41Z
dc.date.available 2019-07-04T07:52:41Z
dc.identifier.uri http://hdl.handle.net/11201/149547
dc.description.abstract [eng] We investigated the species-specific phosphorus (P) nutritional strategies in the microphytoplankton community in the Mahon estuary (Minorca, Western Mediterranean) in 2011, under two contrasting hydrographic scenarios. Estuarine flow, nutrient concentrations, phytoplankton community composition and enzyme-labeled fluorescence (ELF) were measured in June and October, corresponding to the beginning and the end of summer. Dissolved inorganic nitrogen (DIN) and inorganic phosphate (Pi) exhibited enhanced concentrations in the inner estuary where N:P molar ratios suggested P-limitation in both surveys. Pi was low and variable (0.09±0.02 µmol L-1 in June and 0.06±0.02 µmol L-1 in October), whereas organic phosphorus remained a more readily available P source. Even though ambient Pi concentrations were slightly higher on June, when the microphytoplankton assemblage was dominated by dinoflagellates, the percentage of ELF labeled cells was notably higher (65±9% of total cells) than in October (12±10%), when the presence of diatoms characterized the microphytoplankton community. Alkaline phosphatase activity (AP) was mainly expressed by dinoflagellate taxa, whereas diatoms only displayed significant AP in the inner estuary during the June survey. A P-addition bioassay in which response of AP to Pi enrichment was evaluated showed marked reduction in AP with increasing Pi. However, some dinoflagellate species maintained AP even when Pi was supplied in excess. We suggest that in the case of some dinoflagellate species AP is not as tightly controlled by ambient Pi as previously believed. AP activity in these species could indicate selective use of organic phosphorus, or slow metabolic response to changes in P forms, rather than physiological stress to low Pi availability. We emphasize the importance of identifying the species-specific phosphorus requirements and their capability for P assimilation in order to understand the contribution of microphytoplankton to the whole community response to biogeochemical perturbations.
dc.format application/pdf
dc.relation.isformatof Reproducció del document publicat a: https://doi.org/10.3389/fmars.2015.00054
dc.relation.ispartof Frontiers in Marine Science, 2015, vol. 2, num. 54, p. 1-11
dc.rights cc-by (c) Martínez-Soto, M. C. et al., 2015
dc.rights.uri http://creativecommons.org/licenses/by/3.0/es
dc.subject.classification 574 - Ecologia general i biodiversitat
dc.subject.classification 576 - Biologia cel·lular i subcel·lular. Citologia
dc.subject.other 574 - General ecology and biodiversity Biocoenology. Hydrobiology. Biogeography
dc.subject.other 576 - Cellular and subcellular biology. Cytology
dc.title Species-specific variation in the phosphorus nutritional sources by microphytoplankton in a Mediterranean estuary
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2019-07-04T07:52:42Z
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.identifier.doi https://doi.org/10.3389/fmars.2015.00054

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cc-by (c) Martínez-Soto, M. C. et al., 2015 Except where otherwise noted, this item's license is described as cc-by (c) Martínez-Soto, M. C. et al., 2015

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