Advanced

Dominant impact of water exchange and disruption of stratification on dinoflagellate vertical distribution

Jephson, Therese LU ; Carlsson, Per LU and Fagerberg, Tony LU (2012) In Estuarine, Coastal and Shelf Science 112. p.198-206
Abstract
The vertical positions of four dinoflagellate species in three 48 h periods in late summer in a Swedish fjord (the Gullmar Fjord) reflect changes to the depth of the halocline. During stable, stratified conditions, the chlorophyll a maximum exhibited a diurnal migration pattern, which was disrupted when the halocline was forced closer to the surface by the inflow of more saline water. While conditions were stable, all studied dinoflagellate species were most abundant below the halocline at 06:00 in contrast to the other times of the day when the highest cell concentrations were above the halocline, indicating diurnal vertical migration. However, when wind-induced inflow of more saline water forced the halocline closer to the surface, these... (More)
The vertical positions of four dinoflagellate species in three 48 h periods in late summer in a Swedish fjord (the Gullmar Fjord) reflect changes to the depth of the halocline. During stable, stratified conditions, the chlorophyll a maximum exhibited a diurnal migration pattern, which was disrupted when the halocline was forced closer to the surface by the inflow of more saline water. While conditions were stable, all studied dinoflagellate species were most abundant below the halocline at 06:00 in contrast to the other times of the day when the highest cell concentrations were above the halocline, indicating diurnal vertical migration. However, when wind-induced inflow of more saline water forced the halocline closer to the surface, these patterns were disrupted and there was no sign of diurnal vertical migration. Despite this, there was a vertical heterogeneity in the distribution of dinoflagellates with Dinophysis spp. found mainly above the halocline, while Ceratium spp. also occurred in high cell numbers below the halocline. We acknowledge the importance of representative resolution when sampling in the field, both in time and concerning vertical resolution. (C) 2012 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
STD observations, vertical distribution, fjord dynamics, phytoplankton, vertical migrations, dinoflagellate
in
Estuarine, Coastal and Shelf Science
volume
112
pages
198 - 206
publisher
Elsevier
external identifiers
  • wos:000310652000021
  • scopus:84866940500
ISSN
1096-0015
DOI
10.1016/j.ecss.2012.07.020
language
English
LU publication?
yes
id
2eca0437-0fa8-4ec2-b8e0-e502e826907b (old id 3276225)
date added to LUP
2012-12-20 14:15:53
date last changed
2017-01-01 03:32:02
@article{2eca0437-0fa8-4ec2-b8e0-e502e826907b,
  abstract     = {The vertical positions of four dinoflagellate species in three 48 h periods in late summer in a Swedish fjord (the Gullmar Fjord) reflect changes to the depth of the halocline. During stable, stratified conditions, the chlorophyll a maximum exhibited a diurnal migration pattern, which was disrupted when the halocline was forced closer to the surface by the inflow of more saline water. While conditions were stable, all studied dinoflagellate species were most abundant below the halocline at 06:00 in contrast to the other times of the day when the highest cell concentrations were above the halocline, indicating diurnal vertical migration. However, when wind-induced inflow of more saline water forced the halocline closer to the surface, these patterns were disrupted and there was no sign of diurnal vertical migration. Despite this, there was a vertical heterogeneity in the distribution of dinoflagellates with Dinophysis spp. found mainly above the halocline, while Ceratium spp. also occurred in high cell numbers below the halocline. We acknowledge the importance of representative resolution when sampling in the field, both in time and concerning vertical resolution. (C) 2012 Elsevier Ltd. All rights reserved.},
  author       = {Jephson, Therese and Carlsson, Per and Fagerberg, Tony},
  issn         = {1096-0015},
  keyword      = {STD observations,vertical distribution,fjord dynamics,phytoplankton,vertical migrations,dinoflagellate},
  language     = {eng},
  pages        = {198--206},
  publisher    = {Elsevier},
  series       = {Estuarine, Coastal and Shelf Science},
  title        = {Dominant impact of water exchange and disruption of stratification on dinoflagellate vertical distribution},
  url          = {http://dx.doi.org/10.1016/j.ecss.2012.07.020},
  volume       = {112},
  year         = {2012},
}