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Dependency of dinoflagellate vertical migration on salinity stratification

Jephson, Therese LU ; Fagerberg, Tony LU and Carlsson, Per LU (2011) In Aquatic Microbial Ecology 63(3). p.255-264
Abstract
Increasing precipitation and surface water temperature due to global change may strengthen the salinity gradient in coastal regions, which could influence the behaviour of dinoflagellate migration. We studied diel vertical migration (DVM) behaviour in the dinoflagellates Prorocentrum minimum and Heterocapsa triquetra using vertically stratified laboratory columns with 3 different salinity gradients (difference of 6, 11 and 16 psu). With nutrient-depleted conditions at the surface, and with nutrients added below the halocline, P. minimum remained mainly concentrated in the bottom water, while H. triquetra performed DVM under all 3 salinity treatments. H. triquetra migrated through a salinity difference of 6 and 11 psu, concentrated at the... (More)
Increasing precipitation and surface water temperature due to global change may strengthen the salinity gradient in coastal regions, which could influence the behaviour of dinoflagellate migration. We studied diel vertical migration (DVM) behaviour in the dinoflagellates Prorocentrum minimum and Heterocapsa triquetra using vertically stratified laboratory columns with 3 different salinity gradients (difference of 6, 11 and 16 psu). With nutrient-depleted conditions at the surface, and with nutrients added below the halocline, P. minimum remained mainly concentrated in the bottom water, while H. triquetra performed DVM under all 3 salinity treatments. H. triquetra migrated through a salinity difference of 6 and 11 psu, concentrated at the surface at noon, then migrated to the nutrient-rich bottom water during the night. A salinity gradient of 16, however, stopped H. triquetra cells from moving through the gradient and resulted in a concentration of cells in the cline during the night. At midday, cells were again found at the surface. P. minimum and H. triquetra grown in 4 different salinities (10, 15, 20, 26 psu) and at 3 different temperatures (10, 15, 20 degrees C) showed higher specific growth rates with increasing temperature only in the 2 highest salinity treatments. At 10 degrees C, specific growth rates were not affected by different salinities. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Dinoflagellate, Stratification, Vertical distribution, Global change, Salinity, Temperature, Growth rate, Heterocapsa triquetra, Prorocentrum, minimum
in
Aquatic Microbial Ecology
volume
63
issue
3
pages
255 - 264
publisher
Inter-Research
external identifiers
  • wos:000291057400005
ISSN
0948-3055
DOI
10.3354/ame01498
language
English
LU publication?
yes
id
c41afe2f-868a-4fa0-8865-18b186e8646a (old id 1986177)
date added to LUP
2011-06-29 14:55:06
date last changed
2016-04-16 02:22:22
@article{c41afe2f-868a-4fa0-8865-18b186e8646a,
  abstract     = {Increasing precipitation and surface water temperature due to global change may strengthen the salinity gradient in coastal regions, which could influence the behaviour of dinoflagellate migration. We studied diel vertical migration (DVM) behaviour in the dinoflagellates Prorocentrum minimum and Heterocapsa triquetra using vertically stratified laboratory columns with 3 different salinity gradients (difference of 6, 11 and 16 psu). With nutrient-depleted conditions at the surface, and with nutrients added below the halocline, P. minimum remained mainly concentrated in the bottom water, while H. triquetra performed DVM under all 3 salinity treatments. H. triquetra migrated through a salinity difference of 6 and 11 psu, concentrated at the surface at noon, then migrated to the nutrient-rich bottom water during the night. A salinity gradient of 16, however, stopped H. triquetra cells from moving through the gradient and resulted in a concentration of cells in the cline during the night. At midday, cells were again found at the surface. P. minimum and H. triquetra grown in 4 different salinities (10, 15, 20, 26 psu) and at 3 different temperatures (10, 15, 20 degrees C) showed higher specific growth rates with increasing temperature only in the 2 highest salinity treatments. At 10 degrees C, specific growth rates were not affected by different salinities.},
  author       = {Jephson, Therese and Fagerberg, Tony and Carlsson, Per},
  issn         = {0948-3055},
  keyword      = {Dinoflagellate,Stratification,Vertical distribution,Global change,Salinity,Temperature,Growth rate,Heterocapsa triquetra,Prorocentrum,minimum},
  language     = {eng},
  number       = {3},
  pages        = {255--264},
  publisher    = {Inter-Research},
  series       = {Aquatic Microbial Ecology},
  title        = {Dependency of dinoflagellate vertical migration on salinity stratification},
  url          = {http://dx.doi.org/10.3354/ame01498},
  volume       = {63},
  year         = {2011},
}