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Nutrient ratios and the complex structure of phytoplankton communities in a highly turbid estuary of Southeast Asia
- Source :
- Environmental Monitoring and Assessment, Environmental Monitoring and Assessment, Springer Verlag (Germany), 2014, 186 (12), pp.8555-8572. ⟨10.1007/s10661-014-4024-y⟩, Environmental Monitoring and Assessment, 2014, 186 (12), pp.8555-8572. ⟨10.1007/s10661-014-4024-y⟩
- Publication Year :
- 2014
- Publisher :
- HAL CCSD, 2014.
-
Abstract
- Phytoplankton diversity and abundance in estuarine systems are controlled by many factors. Salinity, turbidity, and inorganic nutrient concentrations and their respective ratios have all been proposed as principal factors that structure phytoplankton diversity and influence the emergence of potentially toxic species. Although much work has been conducted on temperate estuaries, less is known about how phytoplankton diversity is controlled in tropical, monsoonal systems that are subject to large, seasonal shifts in hydrology and to rapidly changing land use. Here, we present the results of an investigation into the factors controlling phytoplankton species composition and distribution in a tropical, monsoonal estuary (Bach Dang estuary, North Vietnam). A total of 245 taxa, 89 genera from six algal divisions were observed. Bacillariophyceae were the most diverse group contributing to 51.4 % of the microalgal assemblage, followed by Dinophyceae (29.8 %), Chlorophyceae (10.2 %), Cyanophyceae (3.7 %), Euglenophyceae (3.7 %) and Dictyochophyceae (1.2 %). The phytoplankton community was structured by inorganic nutrient ratios (DSi:DIP and DIN:DIP) as well as by salinity and turbidity. Evidence of a decrease in phytoplankton diversity concomitant with an increase in abundance and dominance of certain species (e.g., Skeletonema costatum) and the appearance of some potentially toxic species over the last two decades was also found. These changes in phytoplankton diversity are probably due to a combination of land use change resulting in changes in nutrient ratios and concentrations and global change as both rainfall and temperature have increased over the last two decades. It is therefore probable in the future that phytoplankton diversity will continue to change, potentially favoring the emergence of toxic species in this system.
- Subjects :
- 0106 biological sciences
SALINITE
Salinity
PHYTOPLANCTON
DIVERSITE SPECIFIQUE
010501 environmental sciences
STRUCTURE DE POPULATION
01 natural sciences
Nutrient
PHOSPHATE
Water Pollutants
ComputingMilieux_MISCELLANEOUS
General Environmental Science
geography.geographical_feature_category
biology
Ecology
Temperature
NITRITE
Phosphorus
General Medicine
CHLOROPHYLLE
Pollution
Oceanography
Vietnam
Dinoflagellida
ESTUAIRE
Seasons
Estuaries
NITRATE
Dinophyceae
Environmental Monitoring
Nitrogen
Management, Monitoring, Policy and Law
ABONDANCE
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems
Phytoplankton
Temperate climate
Dominance (ecology)
Seawater
14. Life underwater
0105 earth and related environmental sciences
Diatoms
geography
TOXICITE
010604 marine biology & hydrobiology
fungi
Estuary
Global change
TURBIDITE
NUTRIMENT
15. Life on land
biology.organism_classification
13. Climate action
human activities
Subjects
Details
- Language :
- English
- ISSN :
- 01676369 and 15732959
- Database :
- OpenAIRE
- Journal :
- Environmental Monitoring and Assessment, Environmental Monitoring and Assessment, Springer Verlag (Germany), 2014, 186 (12), pp.8555-8572. ⟨10.1007/s10661-014-4024-y⟩, Environmental Monitoring and Assessment, 2014, 186 (12), pp.8555-8572. ⟨10.1007/s10661-014-4024-y⟩
- Accession number :
- edsair.doi.dedup.....53dd3b972675e4b37d6d69d2812efc1f