The role of resting cysts in Alexandrium minutum population dynamics

The role of resting cysts in Alexandrium minutum population dynamics

Special issue Phytoplankton Life-Cycles and Their Impacts on the Ecology of Harmful Algal Bloom.-- 14 pages, 9 figures, 4 tables

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Main Authors: Estrada, Marta, Solé, Jordi, Garcés, Esther, Anglès, Silvia
Format: artículo biblioteca
Language:English
Published: Elsevier 2010-02
Subjects:Alexandrium minutum, Cysts, Dinophyceae, Harmful algal blooms, Mediterranean Sea, Models,
Online Access:http://hdl.handle.net/10261/21857
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spelling dig-icm-es-10261-218572020-11-19T09:40:00Z The role of resting cysts in Alexandrium minutum population dynamics Estrada, Marta Solé, Jordi Garcés, Esther Anglès, Silvia Alexandrium minutum Cysts Dinophyceae Harmful algal blooms Mediterranean Sea Models Special issue Phytoplankton Life-Cycles and Their Impacts on the Ecology of Harmful Algal Bloom.-- 14 pages, 9 figures, 4 tables The role of resting cysts on the development of Alexandrium minutum blooms in a typical Mediterranean semi-enclosed water body (Arenys de Mar Harbor, NW Mediterranean) was studied by means of matrix and dynamic population models. We used a series of scenarios, constrained when possible by experimentally measured parameters to test whether excystment and encystment fluxes and changes in the dormancy period had a major effect on bloom intensity and duration. The results of the simulations highlighted the importance of knowing not only the magnitude and variability of growth and life-cycle transition rates, but also those of loss rates (both in the water column and in the sediment) due to physical or biological factors. Given the maximum encystment rates determined for A. minutum in the study area (0.01 d−1), this process contributed to reduce the peak concentrations of vegetative cells but did not have a dominant effect on bloom termination. Excystment fluxes could contribute to enhance population densities of vegetative cells during times or low or negative net growth rate and during the initial phases of a bloom, but once exponential growth had started, additional excystment had negligible effect on bloom magnitude. However, even if cysts did not contribute to larger blooms, they could represent a safety mechanism for reintroduction of the species when the vegetative cell population went extinct due to unfavorable environmental conditions. Increasing the dormancy time exposed newly formed cysts to a longer period of losses in the sediment that reduced the concentration of excystment-ready sediment cysts and decreased excystment fluxes. More complex models will be needed to explore the implications of different life-cycle strategies in a wider natural ecological context Funding for this study was provided by EU project SEED (GOCE -CT-2005-003875) and by CANESP, a joint project between Spain (Ministerio de Asuntos Exteriores) and the national Research Council of Canada. E. Garcés was supported by a Ramon y Cajal award from the Spanish Ministerio de Ciencia e Innovación Peer reviewed 2010-03-03T09:51:17Z 2010-03-03T09:51:17Z 2010-02 artículo http://purl.org/coar/resource_type/c_6501 Deep Sea Research - Part II - Topical Studies in Oceanography 57(3-4): 308-321 (2010) 0967-0645 http://hdl.handle.net/10261/21857 10.1016/j.dsr2.2009.09.007 en https://doi.org/10.1016/j.dsr2.2009.09.007 none 5875 bytes application/pdf Elsevier
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Alexandrium minutum
Cysts
Dinophyceae
Harmful algal blooms
Mediterranean Sea
Models
Alexandrium minutum
Cysts
Dinophyceae
Harmful algal blooms
Mediterranean Sea
Models
spellingShingle Alexandrium minutum
Cysts
Dinophyceae
Harmful algal blooms
Mediterranean Sea
Models
Alexandrium minutum
Cysts
Dinophyceae
Harmful algal blooms
Mediterranean Sea
Models
Estrada, Marta
Solé, Jordi
Garcés, Esther
Anglès, Silvia
The role of resting cysts in Alexandrium minutum population dynamics
description Special issue Phytoplankton Life-Cycles and Their Impacts on the Ecology of Harmful Algal Bloom.-- 14 pages, 9 figures, 4 tables
format artículo
topic_facet Alexandrium minutum
Cysts
Dinophyceae
Harmful algal blooms
Mediterranean Sea
Models
author Estrada, Marta
Solé, Jordi
Garcés, Esther
Anglès, Silvia
author_facet Estrada, Marta
Solé, Jordi
Garcés, Esther
Anglès, Silvia
author_sort Estrada, Marta
title The role of resting cysts in Alexandrium minutum population dynamics
title_short The role of resting cysts in Alexandrium minutum population dynamics
title_full The role of resting cysts in Alexandrium minutum population dynamics
title_fullStr The role of resting cysts in Alexandrium minutum population dynamics
title_full_unstemmed The role of resting cysts in Alexandrium minutum population dynamics
title_sort role of resting cysts in alexandrium minutum population dynamics
publisher Elsevier
publishDate 2010-02
url http://hdl.handle.net/10261/21857
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